Home

Patara HP Green Laser - CEO Knowledge Center

1. X PRINS SOME D ie MPP RY S T 11969 2006 MEHMET 2014 Northrop Grumman Systems Corporation iV Gigashot Laser User Manual Conventions The following conventions appear in this manual This icon denotes a caution or a warning which advise you of precautions to take to avoid injury data loss or a system crash Initial Capped The first letter in uppercase refers to menu options e g Phase Delay Pulse Width CAPS Front panel buttons knobs and connectors appear in all uppercase letters e g MENU CURRENT gt The gt symbol separates a sequence of button pushes e g MENU gt CHANNEL SETUP PULSE WIDTH means that you push the MENU button then push the CHANNEL SETUP soft key and then push the PULSE WIDTH soft key italic Italic text denotes references to other resources that may be helpful to you or to bring attention to important information This icon denotes a note which alerts you to important information l Power Switch Position Symbols 0 150 O Off The following conventions may appear on the product DANGER An injury hazard immediately accessible as you read the marking WARNING A hazard not immediately accessible as you read the marking CAUTION A hazard to property including the product ESD Handle Appropriately 2014 Northrop Grumman Systems Corporation V Gigashot Laser User Manual Laser Emission Use caution Shock Hazard Use caution Caution Risk
2. Gigashot Laser GS 320 QMI GS 150 QMG GS 100 QMU April 2014 CEO UMAN 0067 NORTHROP GRUMMAN Original Worldwide Technical Support and Product Information http www northropgrumman com Business Ventures CEO Pages Service aspx http www ngceoservice com Knowledge Center Hours 8 00 a m to 5 00 p m Central time Technical Support 636 916 4900 follow prompts for department directory Email ngceoservice ngc com Cutting Edge Optronics Headquarters 20 Point West Blvd St Charles MO 63301 USA Sales Support 636 916 4900 follow prompts for department directory After office hours please leave a voice mail message Outside North America contact a Cutting Edge Optronics sales office or distributor see the Cutting Edge Optronics website for a list of offices 2014 Cutting Edge Optronics a strategic business unit of Northrop Grumman Systems Corporation All rights reserved 2014 Northrop Grumman Systems Corporation i Gigashot Laser User Manual Important Information Warranty Summary Northrop Grumman Cutting Edge Optronics NG CEO warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one year from the date of shipment from an NG CEO distributor If a product proves defective within the respective period NG CEO will provide repair or replacement as described in the complete warranty statement To arrange for se
3. 36 28 3 0 4 9 5 15 7 20 2 23 9 270 29 6 32 0 34 1 36 0 40 26 0 2 6 12 7 19 1 23 8 27 6 30 7 33 5 35 9 38 0 40 0 If required to operate a laser in conditions near the condensation temperature take precautions to keep the laser dry The laser should be operated inside an area that is purged with nitrogen N2 or encased in a sealed enclosure with a desiccant Gigashot Controller The controller front panel provides an emergency stop button to halt laser output WARNING The emergency stop should only be used in an emergency situation For normal operation use the shutter or emission buttons to halt laser output 2014 Northrop Grumman Systems Corporation 24 Gigashot Laser User Manual Chapter 3 System Details Additional information about the eDrive Nitro can be found in the eDrive Nitro User Manual 4x40 Selector Shutter Emission Keylock Emergency LCD Knob Indicators Switch Stop Switch fo O es ON O A POWER MENU CURRENT SHUTTER EMISSION oO oOo oO O LI LILI O O O Power Soft Dedicated Switch Keys Keys Figure 3 4 eDrive Nitro Control Panel The parameters of the eDrive DC power supply and the timing unit are controlled by the graphic user interface GUI supplied with the Gigashot system None the front panel controls should be used except for the keylock switch and the emergency stop switch An externa
4. HORIZ ADJ A PURGE COOLANT OUT Z O aT EF Y 1 x Figure 4 5 Connectors on the Rear Panel of the Gigashot Laser Figure 4 5 shows all of the connectors on the back panel of the Gigashot laser All of the connectors are clearly labeled The steps for installation follow 2014 Northrop Grumman Systems Corporation 39 Gigashot Laser User Manual Chapter 4 Installation and Operation 1 Plumbing Connection Push the barb fittings of water hoses connectors gently into the COOLANT IN and COOLANT OUT ports by following the flow patch direction Wetting the o rings of the quick disconnect fittings and receptacles can prevent the o ring from being cut by the mating piece during insertion Make sure that the quick disconnect fittings are locked A click is heard once it is locked 2 Laser Signal Connection Align the female connector of the laser signal cable to the J1 connector on the laser head Once it is aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked 3 Q switch Trigger Connection Connect the Q switch trigger cable to the SMA connector QSW TRG IN on the laser head accordingly The cable should be threaded on to the connector by turning it clockwise until hand tight 4 Q switch Power Connection Connect the Q switch power cable to the BNC connector 24 VDC on the laser head accordingly The connector should be locked a
5. 2014 Northrop Grumman Systems Corporation 63 Gigashot Laser User Manual Chapter 7 Troubleshooting Laser is misaligned Perform the laser power optimization procedures as described in the Optimize Laser Performance section in Chapter 5 Maintenance to bring the power back Internal optical damage to the laser contaminated rod or aging diodes If the laser power cannot be restored after optimization contact NG CEO for service No Output Power Verify the operating current is set at the operation point Verify the Q switch is triggered at preset PULSE FREQUENCY with an internal or external triggering source Verify that the shutter light on the front panel of the eDrive is turned on or a vertical black bar with a green dot to the left is displayed above the SHUTTER button on the GUI indicating that the laser shutter is open Verify there are no interlock warning messages on the eDrive and that the eDrive Nitro is supplying the correct current Laser Flicker When the external perturbations are applied to the laser system the laser exhibits flickering Verify the laser performance is optimized Verify there is no strong vibration force applied to the laser head Verify that the flow rate to the laser head matches the flow rate reported in the ATP Test Report Data Summary and the coolant flow is constant Verify the laser has good output power A laser with high modulation loss or low operating current i
6. 48 C caution vi chassis ground vi chiller 9 10 12 17 19 20 21 22 29 31 34 35 36 37 38 42 43 48 49 50 52 53 56 59 60 65 67 68 69 cleaning 36 condensation 21 22 24 28 40 44 56 contacting Cutting Edge Optronics ii coolant 10 12 19 53 cooling 10 20 Customer Service vii viii 62 63 68 D data summary See test report desiccant 22 24 52 53 54 55 56 63 E eDrive iii viii 10 21 24 25 29 44 49 50 59 64 65 66 67 68 69 emergency stop 24 end of life handling iv ESD v EU directives iv F filters 37 flow switch 12 G ground chassis vi H HG 8 9 11 18 22 27 44 53 59 65 Hold Off 58 2014 Northrop Grumman Systems Corporation Index K Knowledge Center ii 36 L laser emission vi Laser Safety vii viii 13 module 12 57 63 Module 62 63 N negative lens 33 48 O optimize 52 58 optimization 58 61 66 Optishield 20 42 53 P plumbing 20 37 power meter 33 48 58 61 65 PULSE FREQUENCY 51 66 purge 52 53 Q Q Switch 6 49 66 69 R RoHS iv S sales support ii shock hazard vi symbols v 72 Gigashot Laser User Manua Index T W TEC controller 9 11 27 44 49 50 59 65 69 WEEE iv technical support ii test report 10 11 21 42 43 44 45 47 48 49 59 60 2014 Northrop Grumman Systems Corporation 73 Gigashot Laser User Manual
7. The manual consists of the following chapters Chapter 1 Introduction provides a theory of laser operation and a description of the Gigashot laser Chapter 2 Laser Safety describes proper safety procedures you should understand before operating the Gigashot laser Chapter 3 System Details provides information about components of a laser system and proper environmental conditions for operation Chapter 4 Installation and Operation discusses how to unpack setup and powering on your system for the first time Chapter 5 Maintenance provides information on proper maintenance of your laser system Chapter 6 Service provides resources to help fix problems with the Gigashot laser Chapter 7 Troubleshooting provides possible solutions to the most commonly reported issues with the Gigashot laser Appendix A Customer Service provides information to expedite any service request before contacting NG CEO Appendix B System International Units identifies commonly used units 01 measurement found in this manual Appendix C Acronyms provides a list of commonly used abbreviations and their descriptions used throughout this manual 2014 Northrop Grumman Systems Corporation Gigashot Laser User Manual Table of Contents Table of Contents Chapter 1 Introduction Theory of Operation Warm Up Laser System Laser Internal Environment Control System Description Specifications Chapter 2
8. WARNING Make sure that the chiller will not contaminate the laser head 2014 Northrop Grumman Systems Corporation 37 Gigashot Laser User Manual Chapter 4 Installation and Operation Connecting the Chiller Coolant Hoses and Filter Connections The required coolant hoses filters and fittings are included in the plumbing kit that was shipped with your laser They should be connected as illustrated in Figure 4 3 The correct coolant flow path starts with the supply port of the chiller gt filter coolant in port of laser head gt laser head gt coolant out port of laser head gt return port of the chiller Please be aware of the flow direction of the filter Figure 4 3 Example of Coolant Hose and Filter Connections The filter may be attached to the back of the chiller customer s equipment or a wall using the provided L bracket NOTE Threaded hose barbs and adapters should be wrapped 3 4 times with Teflon tape around the threads 2014 Northrop Grumman Systems Corporation 38 Gigashot Laser User Manual Chapter 4 Installation and Operation Figure 4 4 depicts the chiller with connected coolant hoses Figure 4 4 Chiller Assembled with Coolant Hoses and Filter Connections on Laser Head Figure 4 5 depicts the connectors on the rear panel of the Gigashot laser All of the connectors are clearly labeled VERT ADJ 8 24 VDC ALIGNMENT ACCESS O A A COOLANT IN 4 e lt q ay 4
9. if the need arises service facilities that can restore your instrument to peak performance without delay When calling for service in the U S dial 636 916 4900 follow prompts for department directory To phone for service in other countries contact your sales agent This chapter provides reference to types of customer service needs Contacting Customer Service Laser Module Replacement Return the Instrument for Repair 2014 Northrop Grumman Systems Corporation 60 Gigashot Laser User Manual Chapter 6 Customer Service Contacting Customer Service To expedite your service needs please complete the questionnaire in Appendix A Customer Service before you contact NG CEO Technical Service Complete the questionnaire with as much detail as possible and retain a copy for your records E mail or fax the form to NG CEO refer to the second page of this manual for contact information and notify your customer service representative that it has been sent Laser Module Replacement The laser module can be replaced by a trained service engineer Contact NG CEO for Laser Level 2 training and access to Level 2 maintenance instructions Return the Instrument for R epair A return merchandise authorization RMA is required prior to shipping any instruments to NG CEO Contact NG CEO or your local distributor for RMA and shipping instructions CAUTION Failure to obtain proper shipping instructions may result in damage to th
10. 1 Introduction Diode Heat Exchanger Figure 1 5 Pumping Uniformity of REA QCW Module 2014 Northrop Grumman Systems Corporation 5 Gigashot Laser User Manual Chapter 1 Introduction EO Q Switch and Driver HIGH VOLTAGE MOSFET SWITCH Normally Open T 10 TO 90 gt RISE TIME lt 4 i 6 ELL RECOVERY TIME T RC Max REP RATE 1 T VOLTAGE ACROSS POCKELS C HV Time 2s Figure 1 6 Typical H V Output of Q Switch Driver The Gigashot laser uses an electro optic EO Q switch The Q switch comprises a polarizer a quarter wave plate and a Pockels cell Applying high voltage to the Pockels cell crystal changes its polarization retardation characteristics which determine whether the Q switch is open low loss or closed high loss Figure 1 6 indicates output pulse of the Q switch driver with balanced output The ON time of 2 us is a function of RC time constants where R is the internal switching circuit resistance and C is the sum of Pockels cell circuit and cable capacitance Static voltage across Pockels cell is zero volts when output is not triggered When output is triggered voltage across cell switches to the high voltage set point The advantage of this circuit is the absence of a net DC voltage across the EO Q switch Continued long term application of DC high voltage may cause ion migration within the crystal resulting in fogge
11. Characteristics 3 Figure 1 3 Pump Light Absorption vs Pump Array Center Wavelength 4 Figure 1 4 Example of Radial Pump Geometry Error Bookmark not defined Figure 1 5 Pumping Uniformity of REA QCW Module 5 Figure 1 6 Typical H V Output of Q Switch Driver 6 Figure 1 7 Typical System Block Diagram Controller Subsystem Inside Dotted Line 10 Table 1 1 Typical Specifications Table 10 Figure 2 1 Example of Radiation Control Drawing 16 Figure 3 1 Gigashot Rear View 18 Figure 3 2 Gigashot Top View 19 Table 3 1 Cooling System Requirements 20 Table 3 2 Avoid with Chillers 20 Figure 3 3 Constant Dew Point Lines for Ambient Temperature and Relative Humidity 23 Table 3 3 Table of Air Condensation Temperature at Given Ambient Air Temperature Celsius and Relative Humidity percent 24 Figure 3 4 eDrive Nitro Control Panel 25 Figure 3 5 Controller Front Panel 26 Figure 3 6 Graphic User Interface 26 Figure 4 1 Components for the Gigashot Laser 32 Figure 4 2 Basic Setup for the Laser Power Test 34 Table 4 1 AC Requirements for Controller 35 Figure 4 3 Example of Coolant Hose and Filter Connections 38 2014 Northrop Grumman Systems Corporation xi Gigashot Laser User Manual List of Figures and Tables Figure 4 4 Chiller Assembled with Coolant Hoses and Filter 39 Figure 4 5 Connectors on the Rear Panel of the Gigashot Laser 39 Figure 4 6 Gigashot Laser Connections 40 Figure 4 7 Controller Rear Panel Schematic 41 Figure 4 8 Front Pane
12. Module Center for Devices and Radiological Health U S Food and Drug Administration Cutting Edge Optronics Incorporated Code of Federal Regulations Continuous Wave Direct Current Diode Pumped Solid State Electro Optical type of Q switch Electro Static Discharge Field Effect Transistor U S Food and Drug Administration First Pulse Suppression Full Width at Half Maximum Gallium Aluminum Arsenide Gallons Per Minute Helium Neon Harmonic Generator Harmonic Mirror High Reflector High Voltage International Electrotechnical Commission Infrared Potassium Titanyl Phosphate 70 Gigashot Laser User Manual Acronym LPM LBO MCC N2 Nd YAG Nd YLF NG NIR OC OSHA PULSE FREQUENCY psi QCW QSW RF RH RMS TEC TEM TTL UV VAC 2014 Northrop Grumman Systems Corporation Appendix C Acronyms Description Liters per Minute Lithium Triborate Meters Concave Nitrogen Neodymium doped Yttrium Aluminum Garnet Neodymium doped Yttrium Lithium Fluoride Northrop Grumman Near Infrared Output Coupler Occupational Safety and Health Administration Pulse Repetition Frequency Pounds per Square Inch Quasi Continuous Wave Q switch Radio Frequency Relative Humidity Root Mean Square Thermal Electric Cooler Transverse Electromagnetic Mode Transistor Transistor Logic Ultra Violet Volts Alternating Current 71 Gigashot Laser User Manual Index A ATP See test report attenuation
13. Refill the chiller reservoir with Optishield Plus and distilled water coolant following the manufacturer s directions Run for 30 minutes with the cap loose to allow gas to escape from the system Secure the reservoir cap The chiller is now ready to use off Checking hold off is a technique needed to verify proper operation of the laser To check hold off perform the following steps l 2 Turn on the laser and run for at least 20 minutes Lower the current to 10A 3 Power off the Q switch driver by disconnecting the 24V DC on the back of laser enclosure Gradually increase the current to the full operation current level Observe the beam output on the power meter Hold off condition is met when no output light is observed If output light is observed the laser does not hold off and may need internal repair or adjustment Reduce the current to 10A Power up the Q switch driver with connection of 24V DC on the back of laser enclosure Gradually increase the current to the operation current Extend Lifetime of Laser Diodes The specification for laser system optical output is provided in the ATP Test Report Data Summary delivered with the system During its early lifetime the laser diodes will deliver this specified power at or below the preset current limit As the diodes age an increase in current or pumping duration may be required to maintain power and beam quality so the diodes can continue to be used O
14. Your laser shipment includes the final ATP Test Report Data Summary that provides the values necessary to achieve the full power conditions The temperature of the harmonic generation HG crystal for phase matching is crucial to determining the performance of the Gigashot laser It is set and controlled by an internal TEC controller Diode Array Power Supply The DC power supply for the Gigashot laser provides the power to the eDrive Nitro Please refer the ATP Test Report Data Summary for the proper voltage and current settings USB To Series Hub The hub is powered through the USB connector by the computer The status and parameters of each subsystem must be monitored and set properly before the laser is started The hub is the hardware interface for the communication between the computer and each subsystem Thermal Control Subsystem Thermal control and heat removal from the laser transmitter is accomplished by the chiller The laser s integral flow switch will interrupt drive current to the amplifier module should the flow rate fall below 1 0 gpm 4 Ipm Flow direction is labeled on the 2014 Northrop Grumman Systems Corporation 11 Gigashot Laser User Manual Chapter 1 Introduction laser optics housing below the coupler ports Please observe the flow direction at all times The thermal control system must be capable of maintaining the temperature set point to 0 1 C with a flow rate of gt 1 5 gpm 6 lpm An i
15. actual operating current and the ATP Test Report Data Summary value may be due to the performance difference of the chillers An increase in the operating current or a change in chiller temperature can compensate for the aging of the Gigashot laser diodes In order to protect the laser eDrive Nitro and DC power supply currents have been limited These limits need to be increased as the laser diodes age 6 Peak up the laser with adjustment of the HR mirror 2014 Northrop Grumman Systems Corporation 57 Gigashot Laser User Manual Chapter 5 Maintenance WARNING Making mirror adjustments can be non reversible Perform this step only when all the steps above have been completed and the laser does not meet the specifications with the correct settings a Reduce the pulse energy to 10mJ by adjusting the Q switch trigger delay to avoid optical damage b Locate the access holes for high reflection HR Notice the positions of horizontal and vertical adjustment access holes for the HR mirror as shown in Figure 5 5 c Remove screws from access holes in the back panel only in a dust free environment d Use a 1 8 inch ball driver to make adjustments Adjustments should be made in very small increments of 1 degree or less rotation e Always make sure that the TEC temperature is stabilized HR VERTICAL ADJUSTMENT ADJUSTMENT Figure 5 5 HR Mirror Adjustment f Optimize power Make small adjustments to the horizont
16. allowed on the front sides and rear of the chiller for access to connections and components The cabinet of the chiller is designed to vent air Maintain free space equal to the height of the chiller for flow of air on the condenser side of the chiller opposite to where the coolant lines connect The two sides and the top must have an equal amount of free space When air flow becomes impeded cooling capacity decreases and electrical efficiency drops as motor load increases Electrical Power For 60 Hz Polyscience chillers with less than 1 5 horsepower the supplied power cord will be for connection to a NEMA 6 20 North America receptacle in accordance with local electrical codes A Euro cord will be supplied with 50Hz models 2014 Northrop Grumman Systems Corporation 36 Gigashot Laser User Manual Chapter 4 Installation and Operation CAUTION The chiller has been set 208 230 Volts at the factory for 60 Hertz single phase or 200 volts for 50 Hertz single phase High voltages out of the specified range could damage the chiller WARNING DO NOT plug the Chiller into the electrical outlet until the unit is ready for Startup Chiller Cleaning Procedures Please follow the proper procedures to clean the chiller before it is connected to the laser head Refer to section Clean and Maintain Chiller in Chapter 5 Maintenance for details Chiller maintenance procedures are also available through the NG CEO Knowledge Center
17. clear them at this time 6 Verify the GUI parameter settings match the last known optimal values 7 After the TEC temperature has stabilized single click the START button to fire the laser diode The indicators for Output Active in the Power Supply and eDrive sections will be green 8 Measure the frequency of channel 1 Confirm the frequency with the GUI after the laser is powered on 9 Allow the laser system to run for at least 20 minutes in order to achieve thermal stabilization 10 Single click the SHUTTER button on the GUI to open the laser shutter and begin laser output The Laser Output indicator in the eDrive section of the GUI will turn green The laser will automatically ramp to the Q switch delay specified in the GUI Wait for about 20 minutes to stabilize the laser Manual Interrupt Procedure 1 Single click the SHUTTER button on the GUI to close the laser shutter and stop laser output The icon on the GUI will display a horizontal bar with a green dot 2 Resume operation by single clicking the SHUTTER button on the GUL A vertical black bar with a green dot to the left will display above the SHUTTER button on the GUI NOTE The laser diodes are still operating at a set frequency and full operating current when the shutter is closed The Q switch trigger signal is disabled Interlock Interrupt A safety interlock BNC connector is located on the back panel of the controller If the continuity of
18. contamination which results in expensive optical damage Do not smoke eat or drink in laser areas Avoid leaving an operating laser unattended Center for Devices and Radiological Health Compliance This laser product complies with Title 21 of the U S Code of Federal Regulations Chapter 1 Subchapter J Part 1040 10 and 1040 11 as applicable To maintain compliance with these regulations once a year or whenever the product has been subject to adverse environmental conditions e g fire flood mechanical shock spilled solvent verify that the radiation controls such as shutter laser on light and audible warning are functioning properly All warning labels should remain fully attached See Figure 2 1 2014 Northrop Grumman Systems Corporation 15 Gigashot Laser User Manual Chapter 2 Laser Safety DANGER Non Interlocked Protective Housing DANGER Laser radiation when open AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION On Rear Panel Warranty Void 2 Labels A 4 Labels one on each side NORTHROP GRUMMAN Cutting Edge Optronics Inc Point West Blvd St Charles MO 63301 MANUFACTURED St Charles MO USA MODEL NO GS XXX XXX XXXX SERIAL NO XXXXXX DANGER This Laser product complies with D INGER Defeatably Interlocked Protective Housing 21 CFR 1040 as applicable HIGH Laser radiation when open and VOLTAGE interlock defeat
19. dew point is the highest surface temperature that allows water to form from the ambient water vapor The dew point is dependent on the surrounding air temperature and relative humidity If a surface such as a laser diode is cooled to or below the condensation temperature water may collect on that surface A formula for calculating dew point is as follows along with a calculated table shown if Figure 3 3 All temperatures are given in Celsius Condensation Temperature d gt 237 7 xa T RH 17 27xT n 2 a T RH 17 27 a T RH where 237 7 T 100 T is the ambient air temperature in degrees Celsius 0 lt T lt 60 RH is the relative humidity in percent 1 lt RH lt 100 Ty is the air condensation temperature For example suppose your chiller is running at 22 C and the ambient air temperature near the laser is 28 C 82 F Referring to Figure 3 3 and Table 3 3 find the intersection of the 28 C air temperature and the curve for the 22 C diode temperature At a relative humidity of 70 percent or greater condensation will form on the laser diodes Controlling the humidity level inside the laser is important to extend the lifetime of the HG crystal The desiccant cartridge on the top cover can help to remove excess moisture from inside the laser head WARNING Do not operate the laser without a functional desiccant cartridge Condensation on the diode arrays can seriously damage the laser and
20. follow the laser performances optimization procedures in Chapter 5 Maintenance Daily Operation Output energy and repetition rate of the Gigashot laser system can be adjusted within a specified range Operating protocols must be observed to assure operation without risking internal damage to optical components Contact NG CEO Customer Service if the laser must be operated outside the specified range CAUTION The output beam of this system is a safety hazard Avoid viewing the beam directly Turn On Procedure 1 Switch the chiller to the ON position Verify correct flow rate and temperature setting to value specified on laser ATP Test Report Data Summary Wait until the chiller has achieved proper temperature which may take 5 to 10 minutes Flip the power switch on the rear panel of the controller to the ON or position 3 Make sure that the red EMERGENCY button of the eDrive Nitro is released Turn the key switch to the ON position if not in the ON position already Flip the power switch on the front panel of the DC power supply to the ON or position if not in the ON position already 2014 Northrop Grumman Systems Corporation 47 Gigashot Laser User Manual Chapter 4 Installation and Operation 5 Launch the Gigashot Laser System Controller GUI from the computer Ensure the ready signals at the top of each section of the GUI show green indicating that communication is established If there are any faults
21. matched via the closed loop chiller For maximum efficiency the diode output wavelength must match the laser medium absorption characteristics see Figure 1 2 The output spectrum of a conventional pump source for Nd YAG operation the xenon arc lamp and an 808 nm diode array is also shown Laser Diode Pump Wavelength 808 nm Xenon flash tube 1700 A cm C J Absorption spectrum 2 M AJ ption sp Ah NN 5 2 7 of Nd YAG 6 300 K Wavelength ym Figure 1 2 Nd YAG Absorption Characteristics A single GaAlAs laser diode bar has a 2 nm full width at half maximum FWHM distribution of output wavelengths However the process used in the manufacture of GaAlAs laser diodes results in a peak output wavelength for each diode that fits within a 10 nm distribution of wavelengths from 800 810 nm To match the diode output to an absorption peak of the laser medium diodes are selected with similar peak output wavelengths within the manufacturing range Temperature tuning is possible because GaAlAs diode characteristics are such that 0 25 nm of wavelength shift occurs for every 1 C change in temperature of the diode junction Cooling shortens the wavelength and heating lengthens it 2014 Northrop Grumman Systems Corporation 3 Gigashot Laser User Manual Chapter 1 Introduction Figure 1 3 shows the percentage of pump light of different wavelengths absorbed by two passes through a 6 35 mm thick Nd YAG rod In NG CEO modul
22. of danger Refer to manual Chassis Ground 2014 Northrop Grumman Systems Corporation vi Gigashot Laser User Manual General Safety Summary The Gigashot Laser System emits laser radiation that can permanently damage eyes and skin ignite fires and vaporize materials Chapter 2 Laser Safety contains information and guidance about these hazards To minimize the risk of injury or expensive repairs carefully follow these instructions Do not attempt to operate the laser system before carefully reading this complete operation manual If you have any questions on the product that have not been discussed sufficiently in this manual contact the manufacturer for complete instructions Failure to heed this warning may result in the destruction or serious damage to the device and will void the product warranty The Service and Troubleshooting sections are intended to help guide you to the source of problems Do not attempt repairs while the unit is under warranty instead report all problems to NG CEO for warranty repair Use the form in Appendix A Customer Service to describe issues with the laser We also suggest that you record information about the laser such as power settings time and date 2014 Northrop Grumman Systems Corporation vil Gigashot Laser User Manual About This Manual This manual describes the installation operation and service of the Gigashot Laser System with the eDrive Nitro Laser Controller
23. programming experience for operation See Table 3 4 for details regarding the graphic user interface The sections of the GUI include parameter settings and status feedback for the Chiller the Timing Unit DC Power Supply eDrive and overall System status The indicator box at the top of each section should display a green light in each of the Ready status boxes which means that each device is powered on and communication is established A 2014 Northrop Grumman Systems Corporation 26 Gigashot Laser User Manual Chapter 3 System Details yellow light in any of the first four Ready fields indicates the system is not communicating with the device and the laser will not operate There are four field types Status Indicates the readiness and status of each device b Input Generally the input parameters are set before operation of the laser according to the ATP Test Report Data Summary The user may change some of the settings even when the laser is in operation While the laser is in operation some input parameters cannot be changed These locked parameters will show as gray instead of black text on the GUI Readout These fields indicate the current operating conditions d Command Buttons START SHUTTER and STOP The START button initiates the following sequence the DC power supply mode is switched from standby to output the eDrive Nitro mode is switched from standby to emission allowing t
24. replace the desiccant System Description The Gigashot laser consists of four interconnected subsystems The optics subsystem contains the laser oscillator the control electronic subsystem provides power timing and control for the laser transmitter the chiller provides thermal control and a computer provides the graphic user interface GUI to control the laser The user must supply prime power and cooling to the optics subsystem The interface relationships among these subsystems are illustrated in Figure 1 7 2014 Northrop Grumman Systems Corporation 9 Gigashot Laser User Manual Chapter 1 Introduction Aiou 1064 nm Inpu Optional Chiller Coolant Laser 532nm 355nm 266nm Sees eee O contrat POTT Sync Signal Q Switch Trigger Interlock Signals Diode Array Power Qsw 24V Array i imi i eDrive External Timing Unit DC Power Supply gt Current Trigger RS232 i RS232 2 RS232 USB to Serial Hub post System i U AC Input Figure 1 7 Typical System Block Diagram Controller Subsystem Inside Dotted Line Specifications For performance specifications please refer to the NG CEO website for standard lasers or the agreed upon specifications noted in your contract Table 1 1 Typical Specifications Table Parameter Performance Electrical Inputs 240 VAC 10 A 1 phase Cooling Closed Loop Re circulating Chiller Coolant Opti Shield Plus Operating Temper
25. C is equipped on your laser model The phase matching of the harmonic generation HG crystal is crucial for the Gigashot laser This is achieved by setting the proper temperature on the HG crystal which is controlled by the TEC controller 2014 Northrop Grumman Systems Corporation 56 Gigashot Laser User Manual Chapter 5 Maintenance Figure 5 4 illustrates an example of the dependencies of power of the laser to the HG crystal temperature As shown in the example the mid point of the temperature band is around 25 C e mm1064nm eam 532nm z a o 5 26 SHG Crystal Temperature C Figure 5 4 Example of Power Dependence of the laser to SHG Crystal Temperature 4 Peak the laser power by adjustment of chiller temperature The laser diode wavelength will slowly drift as the laser diodes age In order to match the diode wavelength to the absorption wavelength of Nd YAG crystal the chiller temperature has to be adjusted Chiller temperature adjustment should be stopped when the temperature may cause condensation inside the laser 5 Increase the pulse energy by changing the current or pumping pulse width The laser diodes have an aging rate less than 2 over 200 million shots which means the laser would be considered normal if the power is maintained over 200 million shots by increasing the operating current or pumping pulse width by 2 The slight difference between the
26. Laser Safety Safety Overview Precautions for Safe Operation Center for Devices and Radiological Health Compliance Chapter 3 System Details Gigashot Laser Closed Loop Chiller Gigashot Controller Chapter 4 Installation and Operation Laser System Components Unpacking the Laser System Laser Head Setup Controller Setup Chiller Setup Connecting the Chiller PolyScience 6000 Series Power Up Procedure First Time Laser Power Up Procedure 2014 Northrop Grumman Systems Corporation 24 30 32 33 34 35 35 38 43 43 Gigashot Laser User Manual Daily Operation Adjusting the Laser System Chapter 5 Maintenance Prepare for Shipment Purge Housing Replace Desiccant Cartridge Clean and Maintain Chiller Check Hold Off Extend Lifetime of Laser Diodes Optimize Laser Performance Chapter 6 Service Contacting Customer Service Laser Module Replacement Return the Instrument for Repair Chapter 7 Troubleshooting Initial Checklist Laser Output Power Controller Operation Appendix A Customer Service Questions Appendix B System International Units Appendix C Acronyms Index 2014 Northrop Grumman Systems Corporation Table of Contents 47 49 50 51 51 52 54 55 55 56 60 61 61 61 62 63 63 65 66 67 69 70 72 Gigashot Laser User Manual List of Figures and Tables List of Figures and Tables Figure 1 1 Exterior Components and Connections with Barb Fittings 3 Figure 1 2 Nd YAG Absorption
27. Trigger Source Choose the source of the timing Chose Internal or unit using the arrows External Set for optimal Pulse Frequency Choose the pulse frequency using performance Hz the arrows or enter the value according to ATP Test Report Data Summary Factor which determines the Pulse a TE 0 5 Qswitch Divider a aa ne the according to ATP Test 5 gueney Report Data Summary Current Trigger Set for optimal pulse These may be set to delay the energy Current or Q switch in us j witch tagger in us Set for optimal pulse energy Current Trig Output synchronization signal in Set with respect to the Monitor Us Current Trigger Q switch Trig Output synchronization signal in Set with respect to the Monitor us Q switch Trigger Set for optimal gt Set Voltage V Choose the voltage using the performance l arrows or enter the value according to available power supply is Set for optimal liciurrent linuron Choose the current limit using the performance i arrows or enter the value according to ATP Test 9 Report Data Summary Actual Current A Automatic display of current in Read out amperes Set Pulse Width us These may be set to in us Sel for gptimal pulse energy Choose the set current using the Set for optimal pulse Set Current A arrows or enter the value in P p energy 9 amperes 5 Set for optimal Set TEC Set the temperature using the performance Temperature arrows or enter the value according t
28. acturer s instructions Do not reconnect chiller lines to laser prior to shipment After shipment if antifreeze was used drain and clean the chiller Add a new filter and clean Optishield Plus coolant before reconnecting the chiller to the laser Purge Housing The Gigashot optics assembly must be kept at low humidity to protect the HG crystal which is slightly hygroscopic and to prevent the possibility of condensation on the laser diode arrays The Gigashot housing provides a level of protection from entry of ambient humidity but it is not hermetically sealed When operating in a high ambient humidity precautions need to be taken to keep the interior of the housing dry The lid of the housing has a port for a desiccant cartridge which should be changed when the cartridge indicator is no longer blue Also the housing interior can be purged with clean dry air using the valve on the rear of the housing The inlet line is the stemmed valve and is opened and closed by rotating the knob on the valve end Please contact NG CEO before attempting this procedure CAUTION The clean dry air input line must be on a pressure regulator and the line must be filtered 2014 Northrop Grumman Systems Corporation 51 Gigashot Laser User Manual Chapter 5 Maintenance Replace Desiccant Cartridge The desiccant cartridge removes excess moisture from inside the laser head It is located on the lid of the Gigashot laser head The desicca
29. al angle of HR mirror and observe the output power Once a maximum is found adjust the vertical control of HR mirror to maximize power 2014 Northrop Grumman Systems Corporation 58 Gigashot Laser User Manual Chapter 5 Maintenance Laser Pulse Energy vs Q Switch Trigger Delay e e RP RB O N A Q Oo O O 5 gt o 5 Ww O O 210 230 250 270 290 310 330 350 370 Delay ps Figure 5 6 Example of Laser Pulse Energy Dependence on the Q Switch Trigger Delay 7 Peak the laser pulse energy with Q switch trigger delay Figure 5 6 shows an example of the relationship between Q switch trigger delay and pulse energy 8 Repeat the optimization steps with until there is no significant performance improvement 9 Once the laser is optimized the laser should have the best power display a round beam and have good pulse to pulse stability 2014 Northrop Grumman Systems Corporation 59 Gigashot Laser User Manual Chapter 6 Service At Northrop Grumman Cutting Edge Optronics we are proud of the durability of our products Our manufacturing and quality control processes emphasize consistency ruggedness and high performance Nevertheless even the finest instruments break down occasionally We believe that the reliability record of our instruments compares favorably with that of our competition and we hope to demonstrate our superior service by providing dependable instruments and
30. ant Cartridge Clean and Maintain Chiller Check Hold Off Extend Lifetime of Laser Diodes Optimize Laser Performance 2014 Northrop Grumman Systems Corporation 50 Gigashot Laser User Manual Chapter 5 Maintenance Prepare for Shipment It is anticipated that in most applications the Gigashot laser will be installed in another system that will be shipped internationally The Gigashot optical assembly must be properly prepared for shipment if internal damage is to be avoided due to possible freezing of coolant trapped in the lines This procedure follows 1 Ready a dry gas source in preparation for draining the system Oil free dry filtered air or N2 is recommended 2 Remove coolant connections from back of laser housing 3 Connect a dry gas line to the COOLANT OUT connector on the housing Coolant lines must be purged in the proper direction or trapped water may remain in the lines inside the laser If this trapped water freezes it can cause lines to leak coolant when operation is resumed 4 Connect a drain hose with a proper quick disconnect fitting to the COOLANT IN connector on the housing 5 Purge the lines with for at least 1 2 hour at 5 psi 6 Remove purge lines After the laser is dry place it in a sealed ESD bag with a desiccant Package the laser securely in its original shipping container You will need to remove all coolant from the chiller prior to shipment Refer to the chiller manuf
31. ant in the chiller should be replaced at least monthly Comply with your chiller manufacturer s recommendation if more frequent The color of the filter and coolant hose are good indicators of the coolant quality The coolant hose should be clear and the filter white If not the chiller needs maintenance Drain and re fill the chiller per the chiller and coolant manufacturer s instructions Chemicals and Supplies Needed 3 Hydrogen Peroxide solution sufficient to fill the system Optishield Plus and distilled water solution 10 Optishield Plus 90 distilled water Distilled water sufficient to fill the system Two replacement particle filters NG CEO P N 37023165 NOTE The chiller must run continuously to prevent biological growth or corrosion If the chiller is to be shut down for more than 1 week the coolant loop should be drained flushed with 3 hydrogen peroxide solution and purged with oil free dry filtered air or nitrogen No Cleaning Procedure l Drain chiller and clean any residue or contamination in the reservoir with the use of a bottle brush or alcohol wipes Using a filter housing wrench dismantle the particle filter housing Empty the coolant trapped in the filter housing into a container for later disposal Dispose of the expired particle filter and clean any residue or contamination from the inside of the filter housing Install a new filter in the housing Refill with distilled water and circ
32. are properly connected the following steps indicate how to turn on the cleaned PolyScience 6000 series for the first time 1 Fill the reservoir Remove the filler cap from the reservoir and using a funnel fill the reservoir with a mixture of 10 Optishield Plus and distilled water until it reaches the MAX line on the reservoir s fluid level gauge When full remove the funnel but do not replace the cap at this time WARNING Do not use untreated de ionized water in the system as it is aggressive in nature and can attack and corrode the metals in the laser head 2 Connect the electrical power Plug the chiller s power cord into an appropriate electrical outlet Place the Circuit Breaker Power Switch on the rear of the instrument enclosure to the On position Three decimal points appear on the temperature display two decimal points appear on the pressure flow rate display 3 Start process fluid flow Press the Power button on the front panel The system startup sequence begins The pump turns on and fluid begins circulating through the system The set point temperature appears briefly on the temperature display After a few seconds it will be replaced by the actual fluid temperature The compressor will begin operating 15 to 20 seconds after power up 4 Check for leaks Once the pump is turned on check all of the connectors to see if there is any leakage If leakage is observed turn off the pump immediately and fix the leak The r
33. ast 1U 1 75 4 45 cm clearance for cooling air to reach the ventilation inlets on the controller cabinet You must also allow sufficient space for unobstructed airflow on each side and rear so that the operating ambient temperature stays within the specifications The controller may be placed under the optical table Chiller Setup Ambient Temperature and Relative Humidity Location The chiller is designed for indoor installation in ambient temperatures between 5 C and 30 C 41 F and 86 F Relative humidity should not exceed 80 percent non condensing The Chiller should be installed on a strong level surface Position the chiller close to the laser as possible Do not installer the chiller any closer than 4 feet 1 4 meters from a heat generating source such as heating pipes or boilers If possible the chiller should be located near a suitable drain to prevent flooding in the event of leaks Do not place it where corrosive fumes excessive moisture dust or high room temperatures are present 2014 Northrop Grumman Systems Corporation 35 Gigashot Laser User Manual Chapter 4 Installation and Operation For ease of positioning and maneuverability the chiller is supplied with casters The front wheels can be locked to keep the chiller in place while in use To help prevent voltage drops position the chiller as close as possible to the power distribution panel Avoid voltage drops by using a properly grounded power ou
34. ature 18 30 C Laser head size 44 05 L x 8 68 H x 14 9 W Controller Size 27 Hx 23 5 W x 30 D 1 Chiller must be able to circulate a minimum of 1 5 gpm of coolant at the approximately 60 psi See the ATP Test Report Data Summary sheet supplied with the laser for the exact flow rate required Optics Subsystem The optics subsystem consists of an optical assembly on a NG CEO industrial laser optics bench The optical assembly is kinematically mounted to the housing 2014 Northrop Grumman Systems Corporation 10 Gigashot Laser User Manual Chapter 1 Introduction Controller Subsystem There are five components total in the controller subsystem These components are mounted in an equipment rack The equipment rack is demarcated by a dotted line in the system block diagram shown in Figure 1 7 above Timing Unit The timing unit sets the timing for the whole laser system It provides the trigger signals to the eDrive Nitro and Q switch driver at a fixed frequency It also provides the synchronization output TTL signals for reference If the whole laser is triggered externally it must be at the designed fixed frequency Q Switch Power Supply The Q switch driver is located inside the laser head It requires 24V DC power and the trigger signal to drive the Pockels cell eDrive Nitro The eDrive Nitro controls the peak pumping current and the pumping pulse duration The frequency is controlled by the timing unit
35. ay to extract diffraction limited energy from large volume high gain laser media The design of an unstable resonator cavity is a more complicated procedure than for a stable resonator because of the interdependence of cavity length output coupling and mirror radii of curvature The requirement to avoid focal points in the cavity and the desire to have a collimated output beam dictate the choice of positive branch confocal unstable resonator A Gaussian mirror also known as VRM variable reflecting mirror is characterized by a degree of reflection that slopes from the center of the optic in a Gaussian distribution Such mirror is used as the output coupler in unstable resonator where it helps produce high quality laser beams with low beam divergence at high pulse energies Unlike Gaussian beam profiles generated by low gain stable oscillators the unstable resonator mode is not described by a simple analytical expression There are annular rings that modulate the beam intensity even though a Gaussian mirror as the output coupler is carefully selected Actually these concentric circular fringes are the result of Fresnel diffraction of light from the edge of the Nd YAG rod The thermal lensing and birefringence of the Nd YAG rod have to be considered during design the unstable laser cavity Any solid laser material operating in either the CW or QCW mode of operation must dissipate an appreciable amount of heat The heat arises from the non radiat
36. back of the controller The cable should be threaded on to the connector by turning it clockwise until hand tight Q switch Power Connection Connect the male BNC connector of the Q switch power cable to the receptacle labeled LASER 24V on the back of the controller The connector should be locked as well by turning it clockwise until it stops Chiller Interlock Connection Connect the DB9 chiller interlock shorting connector to the receptacle labeled CHILLER I C Chiller Communication Connection Connect the DB9 RS232 chiller communication cable from the chiller to the receptacle labeled CHILLER RS232 Interlock BNC Connection Connect from door interlock to the receptacle labeled INTLK for laser safety If not used the shorting BNC should be used instead USB Connection Connect the USB cable from the GUI computer to the receptacle labeled USB AC IN Connection Connect the AC power cable from the wall plug to the receptacle labeled AC IN 10 AC OUT Connection An optional AC power port for the computer 2014 Northrop Grumman Systems Corporation 42 Gigashot Laser User Manual Chapter 4 Installation and Operation PolyScience 6000 Series Power Up Procedure NG CEO routinely supplies a chiller with each laser system If a customer purchases the chiller separately the chiller must be cleaned properly per manufacturer s instructions before it is connected to the laser head Assuming the coolant hose filter and laser head
37. ct peak current pumping pulse width pumping frequency and other settings match the ATP Test Report Data Summary supplied with the laser This can be verified through the current monitor port Verify that the delay between the eDrive and Q switch trigger matches the ATP Test Report Data Summary This can be verified with two synchronization monitor outputs Verify that the TEC is set to the temperature specified on the ATP Test Report Data Summary supplied with the laser Verify the chiller temperature and flow rate are correct Operate the laser and for at least 20 minutes to reach full power and stability before making any adjustments NOTE Only after verifying these conditions should you attempt to make adjustments to the laser system Laser Output Power Low Output Power 0 01W full Delay is not optimized Check the setting of the Q switch delay in the settings Problem with power meter Use another power meter to verify the measurement Low operating current or pumping duration Check the set current and pumping duration Coolant flow rate temperature incorrect Verify the chiller is set to provide the correct coolant flow rate and temperature to the laser head Phase matching condition of HG crystal is not met Check the temperature of TEC if equipped controller and make sure it works properly Pulse repetition frequency incorrect Check the pulse rate frequencies of the pumping current and Q switching
38. d YAG rod The standard Gigashot laser is designed for frequency gt 100Hz BBO Pockels cell is used to handle high average power Three carbon fiber rod structures are selected for the best thermal stability of the laser cavity REA QCW Gain Module Northrop Grumman Cutting Edge Optronics NG CEO diode pumped gain modules use temperature tuned GaAlAs laser diodes These diodes replace flash arc lamps light sources as the optical pump source The principal advantages of this approach include Longer lifetime More compact size More efficient operation The REA QCW Series module uses pulsed arrays of solid state laser diodes to optically pump a neodymium doped yttrium aluminum garnet Nd YAG lasing medium The diode optical output power is radially coupled into the laser rod The Nd YAG laser rod has an anti reflection coating chosen for the highest gain wavelength of this material 1064 nm The REA Series module is constructed within a durable and rigid structure Exterior components and connections are shown as an example in Figure 1 1 2014 Northrop Grumman Systems Corporation 2 Gigashot Laser User Manual Chapter 1 Introduction Timer Coolant Inlet D a gt 6 Y bP Power Lugs Coolant Outlet Figure 1 1 Exterior Components and Connections with Barb Fittings Temperature Tuning of Laser Diodes The laser diodes are located within the REA QCW Series module and tuned wavelength
39. d optical surfaces and ultimate degradation of the device The balanced output configuration provides for the zero voltage condition needed for continuous long term operation The Nd YAG laser amplifier is capable of storing a considerable amount of energy due to the long upper state lifetime of the Nd ion when the Q switch is closed The EO Q switch prevents the buildup of optical power in the oscillator cavity by introducing a loss greater than the available gain allowing energy to accumulate in the gain medium 2014 Northrop Grumman Systems Corporation 6 Gigashot Laser User Manual Chapter 1 Introduction When the Q switch is suddenly opened by applying high voltage to the Pockels cell the loss of Q switch is removed allowing the laser power to increase exponentially with each round trip of the oscillator cavity until much of the stored energy is exhausted and the gain once again falls below the loss The resultant pulse width is lt 10 ns and the peak optical power is tens of megawatts The high peak power achieved in this manner is also essential to achieving an adequate wavelength conversion through several nonlinear processes e g frequency doubling frequency mixing optical parametric chirped pulse amplification OPCPA and other applications A short pulse provides excellent temporal resolution of fast phenomena like rapid chemical reactions or high speed motion Unstable Laser Cavity Unstable resonators provide the best w
40. e instrument Use the packing boxes supplied by NG CEO to ship your instruments If shipping boxes have been lost or destroyed replacements are available for a nominal charge from NG CEO Remove all coolant from laser prior to packaging for shipment see Chapter 5 Maintenance for details Place a desiccant in a sealed ESD bag with the laser and secure the laser in the shipping container WARNING Damage from residual coolant due to condensation or expansion can be catastrophic to the diode arrays or laser rod if not dealt with properly Such damage is excluded from warranty coverage 2014 Northrop Grumman Systems Corporation 61 Gigashot Laser User Manual Chapter 7 Troubleshooting This chapter is intended to provide possible solutions to common problems encountered with the Gigashot laser during normal use WARNING Do not attempt repairs while the unit is under warranty Complete the form in Appendix A and report problems to NG CEO for repair The following sections can be found in this chapter Initial Checklist Laser Output Power Controller Operation 2014 Northrop Grumman Systems Corporation 62 Gigashot Laser User Manual Chapter 7 Troubleshooting Initial Checklist Before adjusting or attempting troubleshooting procedures verify the following Additional information is available in the troubleshooting guide that was supplied with your laser Verify the eDrive is operating at the corre
41. ed Inside Housing AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION 2 Labels Figure 2 1 Example of Radiation Control Drawing 2014 Northrop Grumman Systems Corporation 16 Gigashot Laser User Manual Chapter 3 System Details This chapter discusses the operation of the Gigashot laser Gigashot Laser Closed Loop Chiller Gigashot Controller 2014 Northrop Grumman Systems Corporation 17 Gigashot Laser User Manual Chapter 3 System Details Gigashot Laser Please see the envelope drawing supplied for your particular model of Gigashot laser for beam output location The Gigashot laser head measures 44 05 inches 111 89 cm by 14 9 inches 37 85 cm by 8 68 inches 22 05 cm not including the connectors at the rear of the laser or the optional beam dump The rear panel of the Gigashot laser has connectors for the cable connection to the electronic subsystem The COOLANT IN and COOLANT OUT ports are also found on the back panel HR VERTICAL ADJUSTMENT SIGNAL CONNECTOR POWER CONNECTOR BEAM ALIGNMENT ACCESS HR HORIZONTAL ADJUSTMENT NITROGEN PURGE VALVE Figure 3 1 Gigashot Rear View The alignment opening is located on the back panel It is sealed by a screw to prevent beam emission during normal operation The service technician can remove the screw and use a HeNe laser to aid alignment WARNING The screw filling the alignment hole is cons
42. epts the return of our products for disposal When you are ready to reclaim the instrument you must properly transfer it according to local regulations concerning WEEE equipment Contact NG CEO Hor your local distributor for shipping instructions Please package the products as directed for a return for repair ROC ROHS Declaration In accordance with the Clause 6 2 of Marking for Control of Pollution Caused by Electronic Information Products SJ T11364 2006 for Measures for the Administration on Pollution Control of Electronic Information Products No 39 Order of the Ministry of Information Industry of the Peoples Republic of China NG CEO includes the following translation about our laser modules PEARL FRE SERHU ARAA t i Northrop Grumman Cutting Edge Optronics 20 Pointe West Bivd St Charles MO 63301 USA 3 GH GS XXX XXX 408885886 ABNSRARAR iia x Ka SARE SATER 9 SLR f Ca Cvi PBB P306 HR 0 0 Lo 0 HE 6 BERD x 0 x x x BEM AME 0 0 0 x 0 HRA GE x BAM UMM 6 X 0 0 X Aem wee x 0 0 o i x BAM ARMA Oo O jo oO 0 WA x 0 0 X 0 0 1 8 a 8 x 0 O R M4 55 nR X 0 0 x 8 m 8 0 o Jo x 0 C 6 x o 0 x x E S2 ME O SS Se SE Se ee eee eee ee 05 8 SRE 51 1 11363 2006
43. er operation The Q switch divider setting allows the user to change the output pulse frequency PF The output PF is determined by dividing the Pulse Frequency in Hz by the integral Q switch divider setting Output Pulse Frequency Pulse Frequency Q switch Divider 2014 Northrop Grumman Systems Corporation 27 Gigashot Laser User Manual Chapter 3 System Details The Timing Unit section of the GUI allows the user to set the delays between the pulsed pumping current and the Q switch Varying the delay will change the output pulse energy Typically the delay in us will be fixed for optimal pulse energy The TEC controller is used to control the temperature of the HG crystal The System Status section of the GUI contains a Show Log button which when selected will show the status of the entire laser system 2014 Northrop Grumman Systems Corporation 28 Gigashot Laser User Manual Field Name Set Temperature C Description Use the up and down arrows to toggle to the optimal temperature Chapter 3 System Details Table 3 4 Graphic User Interface Descriptions Setting Set for optimal setting of the chiller or enter the performance S value Actual Automatic display of actual Beacon 5 Temperature C temperature in Celsius units Pressure psi Automatic display of pressure in psi Read out Flow Rate gom Automatic display of flow rate in Bean oul gpm
44. es the laser diode center wavelength under normal operating conditions is near the absorption peak of the laser medium The operating temperature of closed loop chiller is carefully chosen to shift the diode temperature so that the wavelength matches the absorption peak The final test report included with each module indicates the optimum operation temperature for that module Modeled Pump Light Absorption vs Pump Array Center Wavelength Spectral Width of Pump Array m 2 nm fwhm nm fwhm 4 6 35 mm diameter rod 0 6 Nd YAG 2 pass absorption Net Pump Light Absorption Pump Array Center Wavelength nm Figure 1 3 Pump Light Absorption vs Pump Array Center Wavelength REA QCW Series Description The REA Series module utilizes a radial longitudinal pump geometry to excite the solid state laser medium see Figure 1 4 This pump geometry results in excellent gain uniformity see Figure 1 5 and lensing performance The reflector directs the divergent diode light back to the laser medium which is kept in a flow tube for coolant circulation The laser medium is a rod 01 neodymium doped yttrium aluminum garnet Nd YAG Both ends of the rod are optically polished and include anti reflection coatings at the lasing wavelength The ends of the rod may be curved to compensate for thermal lensing depending on module configuration 2014 Northrop Grumman Systems Corporation 4 Gigashot Laser User Manual Chapter
45. eservoir s fluid level will drop as the process and or process cooling lines fill with fluid Slowly add fluid to the reservoir until the liquid level remains stable 5 Replace reservoir cap First Time Laser Power Up Procedure Remove the cap that protects laser output window and make sure the window is clean Gently clean the laser output window with a lens tissue and methanol as needed Make sure all communications and power cables and the computer with the GUI are connected WARNING Never allow the reflected laser beams to re enter the laser as optical damage may occur and thereby void the warranty 2014 Northrop Grumman Systems Corporation 43 Gigashot Laser User Manual Chapter 4 Installation and Operation Verify Chiller Settings 1 Turn on the chiller 2 Check the temperature setting of the chiller Refer to the ATP Test Report Data Summary included in your Gigashot laser shipment for the coolant operational temperature The chiller s temperature setting should be the same as in the report If it is set to a different temperature change it to match the setting on the report The minimum flow rate for Gigashot laser is 1 5 gpm Typically it is 1 8 gpm using the NG CEO supplied chiller and standard plumbing kit If the flow rate is not gt 1 5 gpm adjust the bypass valve inside the chiller When adjusting and setting the flow rate do not allow the coolant pressure to exceed 70 psi NOTE Chiller fl
46. he current pulses to flow to the laser module s the eDrive Nitro is triggered at the pulse frequency and the laser is powered on The user will hear multiple audible warnings as the sequence occurs When SHUTTER button is used to open the shutter the shutter opens and after a short one second delay the Q switch is triggered and the laser begins operating When the shutter button is used to close the shutter the Q switch triggering stops and the shutter closes immediately The shutter status indicator displays the shutter position Figure 3 6 shows the shutter status indicator in the open position The STOP button switches eDrive Nitro mode from emission to standby and the DC power supply mode from output to standby The initial optimal chiller temperature should be set per the ATP Test Report Data Summary in the Set Temperature field in the chiller section The user is allowed to adjust the temperature of the chiller as needed for optimization even when the laser is in operation The range of temperature setting has predetermined limits and should be set for optimal performance The GUI will display the actual temperature pressure and flow rate in the fields below The timing unit section of the GUI allows the user to set the Trigger source The timing unit frequency is the diode current pumping frequency which should be fixed per the ATP Test Report Data Summary Some of the triggers must be preset before las
47. idered a non interlocked cover If the screw is not replaced and the Gigashot laser is running the opening will function as an aperture It can allow an output beam of up to 3 W at the same rep rate and pulse width as the main beam This beam could cause eye or skin damage from direct exposure or specular reflection of the beam Always replace the screw in the alignment hole WARNING Additional adjustment holes in the back panel of the laser housing provide access to the HR cavity mirror The access holes should be always covered unless an alignment is being performed Dust particles can cause damage to the mirrors and crystals inside the laser All holes on the laser enclosure should be sealed all times to prevent moisture penetration Moisture in the enclosure can degrade the lifetime of HG crystal Moisture can also damage the coatings on all optical components 2014 Northrop Grumman Systems Corporation 18 Gigashot Laser User Manual Chapter 3 System Details Figure 3 2 Gigashot Top View Closed Loop Chiller The single most common cause of a laser returned for repair involves customer damage More than one third of laser damage results from cooling problems Coolant problems almost always require the replacement of the diode arrays the single most expensive component in NG CEO lasers This section describes how to avoid damaging arrays WARNING Do not operate laser without cooling Inadequate heat dissipation wil
48. ified frequency 2014 Northrop Grumman Systems Corporation 41 Gigashot Laser User Manual Chapter 4 Installation and Operation Item Description BNC connector provides current trigger monitor for initial SYNC 1 OUT installation synchronization with other systems or diagnostic purposes BNC connector provides Q switch trigger monitor for initial SYNC 2 OUT installation synchronization with other systems or diagnostic purposes INTLK BNC connector used for the laser safety interlock CURRENT MONITOR BNC connector connect to an oscilloscope to monitor the current pulse width and amplitude for initial installation or diagnostic purposes See the eDrive Nitro user manual for current monitor scaling factor Laser Signal Connection Connect the male connector of laser signal cable to the receptacle labeled LASER CONTROL on the back of the controller Once it is aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked Laser Power Connection Connect the male connector of laser power cable to the receptacle labeled LASER POWER on the back of the controller Once it is aligned the connector can be pushed in Turn the locking ring of the connector in the clockwise direction until it is locked Q switch Trigger Connection Connect the male SMA connector of the Q switch trigger cable to the receptacle labeled LASER TRIG on the
49. ion transitions in the material i e the energy differential from pump to fluorescent bands and the quantum efficiency less than one In the cylindrical geometries generally used the heat is removed on the circumferential surface of the cylinder thereby generating a radial thermal gradient The change in temperature within a laser rod causes a thermal distortion of the laser beam due to a temperature and stress dependent variation of the refractive index In addition the generated stresses and strain induce birefringence The birefringence in the laser will cause depolarization loss in the laser and impact the beam profile If birefringence becomes a significant issue it can be compensated with dual identical pump gain modules using a polarization rotator between them Because of birefringence effects the Gigashot is designed to contain one or two modules depending upon the desired output power 2014 Northrop Grumman Systems Corporation 7 Gigashot Laser User Manual Chapter 1 Introduction The thermal lensing of the Nd YAG rod will impact the laser beam diameter and divergence angle At optimum operating parameters the output beam from the unstable cavity will be collimated There is little room for adjustment of the operating current duty cycle frequency and temperature of coolant These parameters determine the average heat load on the Nd YAG rod s and are fixed by design The Gigashot laser has very high power density i
50. ipping container If you file a damage claim you may need it to demonstrate that the damage occurred as a result of shipping If you need to return the unit for service the specially designed carton assures adequate protection A standard Gigashot laser system consists of Item Description Laser Head Model Numbers GS 320 QMI GS 150 QMG GS 100 QMU eDrive DC Power supply Controller Timing Unit Computer optional Chiller 60 Hz Chiller or 50 Hz Chiller Laser Signal Cable 1 Power Cables Determined by electric system available Q switch Trigger Cable 50 Ohm SMA Coaxial Cable Q switch Power Cable 50 Ohm BNC Coaxial Cable Power Cord for Chiller Power Cord for Power Supply and Controller Determined by electric system available Determined by electric system available Desiccant Cartridge 40g P N 42 228 2 Desiccant Refills P N 643665 Desiccant Refill Tool P N 980412 Plumbing Kit P N PK PA EDX 0012 Manual and Software CD CEO UMAN 0067 CD Please check the contents against the packing list and the sales order 2014 Northrop Grumman Systems Corporation 33 Gigashot Laser User Manual Chapter 4 Installation and Operation Laser Head Setup The laser head should be mounted on an optical table or equivalent strong flat surface Three mounting holes are provided to secure the laser The laser should be installed in a clean envir
51. l seriously damage the laser diodes and will void warranty 2014 Northrop Grumman Systems Corporation 19 Gigashot Laser User Manual Chapter 3 System Details Table 3 1 Cooling System Requirements Chiller and Cooling System Requirements Capable of recommended flow rate at 60 psi Optishield Plus mixed with distilled water 90 distilled water 10 Optishield Plus Filter connected between chiller and inlet on laser Chiller Heat Capacity gt Laser Power Consumption 750W Flow sensor installed internally on Gigashot lasers Replace coolant and filter monthly 1 The actual operating pressure should be lower than 70 psi It is acceptable if your chiller can achieve the required minimum flow rate through the laser with a lower water pressure typically around 55 psi Clean coolant keeps coolant lines from clogging Untreated tap water may cause damage Suitable coolants include Optishield Plus from Opti Temp Inc Traverse City Mich 231 946 2931 If Optishield Plus is not allowed due to local regulations use Optishield 3 The filter should be capable of removing particles 5 um or larger The filter and coolant should be replaced each month or more frequently if the pH drops below 8 or the filter or coolant show any discoloration When not using NG CEO drive electronics verify that flow sensor interrupts current to diodes less than 1s after a low flow condition
52. l of Controller 45 Figure 4 9 Four Channel Oscilloscope Screenshot 46 Figure 5 1 40 Gram Desiccant Cartridge Top 52 Figure 5 2 40 Gram Desiccant Cartridge Bottom 52 Figure 5 3 50 Gram Refill and Refill Tool 53 Figure 5 4 Example of Power Dependence of the laser to SHG Crystal Temperature 57 Figure 5 5 HR Mirror Adjustment 58 Figure 5 6 Example of Laser Pulse Energy Dependence on the Q Switch Trigger Delay 59 2014 Northrop Grumman Systems Corporation Gigashot Laser User Manual Chapter 1 Introduction This introduction provides the following information Theory of Operation Warm Up Laser System Laser Internal Environment Control System Description Specifications 2014 Northrop Grumman Systems Corporation 1 Gigashot Laser User Manual Chapter 1 Introduction Theory of Operation Gigashot DPSS laser is the next generation of high energy short pulse diode pumped solid state DPSS Nd YAG laser systems High efficiency and ultra long life quasi continuous wave QCW pump diodes allow the Gigashot laser to operate for many billions of shots A homogenous pumping structure dual gain modules with depolarization compensation give the laser excellent beam quality and stability at high 100 Hz repetition rates The unstable optical resonator uses a graded reflectivity mirror GRM as the output coupler which provides the best way to extract diffraction limited energy from a large volume high gain N
53. l power supply is integrated to drive the laser diodes for Gigashot laser The external DC power supply is connected to the 4U eDrive Current and voltage are regulated through the eDrive Nitro and controlled by the external computer WARNING Read the owner s manual supplied with the DC Power supply for safety information 2014 Northrop Grumman Systems Corporation 25 Gigashot Laser User Manual Chapter 3 System Details Figure 3 5 Controller Front Panel r al Northrop Grumman Cutting Edge Optronics GigaShot Laser System Controller Chiller Timing Unit Power Supply eDrive System Chiller Ready M Pulser Ready 1 Power Supply Ready eDrive Ready System Ready ll Set Temperature C 30 Trigger Source ensi Output Active E Output Active Actual Temperature C 33 3 Set Voltage V 250 Crystal Temperature OK fill Pressure psi 530 Pulse Frequency Hz 110 2 Current Limit A 3 z Humidity OK E ane 5 Laser Output E Flow Rate gpm 26 Q switch Divider 1 Actual Current A 2 3 i Fault Act Channel Delay us IE Current Trigger 0 000 4 Set Pulse Width us 290 0 ME Q switch Trigger 303000 Set Current A 82 0 E synct 0000 Set TEC Temperature 271 Sync 2 2 Actual TEC Temperature 1 SHUTTER STOP L Figure 3 6 Graphic User Interface The graphic user interface GUI is designed to control the laser system The user friendly communications software requires no prior
54. lections To avoid damage to your laser minimize back reflections of its output beam and where they are unavoidable direct them away from the optical axis The back reflection beams can be checked out at pulse energy level WARNING The peak power generated by a Gigashot laser will damage any power meter To measure high average or high peak power meter the beam reflected by a calibrated beam splitter Be sure to safely dump the main beam NOTE Only those trained and authorized by NG CEO should attempt installation and alignment of the Gigashot laser Improper alignment can cause catastrophic damage to optical elements within the cavity DANGER HIGH VOLTAGE AND CURRENT The laser head and power supply contain electrical circuits operating at lethal levels Turn off the system and open the power line circuit breaker before opening the laser housing If you must open the laser housing while the laser is on avoid contact with high voltage components When the laser is off residual high voltage is dangerous Only those trained in the safe repair of high voltage circuits should attempt any electrical service Call NG CEO Technical Service 636 916 4900 for assistance 2014 Northrop Grumman Systems Corporation 30 Gigashot Laser User Manual Chapter 4 Installation and Operation This chapter covers Laser System Components Unpacking the Laser System Laser Head Setup Controller Setup Chiller Setup Co
55. may void warranty 2014 Northrop Grumman Systems Corporation 22 Gigashot Laser User Manual Chapter 3 System Details Constant Dew Point Lines for Ambient Temperature and Relative Humidity 12 C 16 C 2 24 C 28 C 100 ae 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 Relative Humidity 10 5 0 10 13 16 19 22 25 28 31 34 37 40 Temperature C Figure 3 3 Constant Dew Point Lines for Ambient Temperature and Relative Humidity 2014 Northrop Grumman Systems Corporation 23 Gigashot Laser User Manual Chapter 3 System Details Table 3 3 Table of Air Condensation Temperature at Given Ambient Air Temperature Celsius and Relative Humidity percent Relative Humidity 1 10 20 30 40 50 60 70 80 90 100 10 43 9 20 2 11 9 6 8 0 01 26 4 8 6 7 84 0 12 42 6 18 7 10 3 5 0 1 2 1 9 4 5 6 7 8 7 10 4 12 0 16 40 2 15 6 7 0 1 6 2 4 5 6 8 2 10 5 12 5 14 4 16 0 18 39 0 14 1 5 3 0 2 4 2 7 4 10 1 12 4 14 5 16 3 18 0 22 36 6 11 0 2 0 3 6 7 8 11 1 13 9 16 3 18 4 20 3 22 0 24 35 4 9 5 0 4 5 3 9 6 12 9 15 7 18 2 203 22 3 24 0 Air Temperature C 28 33 0 6 5 2 9 8 8 13 1 16 6 195 22 0 24 2 26 2 28 0 30 31 8 4 9 4 6 10 5 14 9 184 21 4 23 9 26 2 28 2 30 0 34 29 5 1 9 7 8 13 9 185 1 201 27 7 30 0 32 1 0
56. mperature of the coolant The laser head needs approximately one half hour to reach the thermal equilibrium from the cool state due to its high thermal resistance For the high power Nd YAG laser there is a thermal response or relaxation time for the laser crystal and also the HG crystal Any large transient operating current change has an impact on the energy storage in the laser crystal as well as thermal properties on both crystals Both the laser crystal and the HG crystal may need several minutes to reach thermal equilibrium Laser Internal Environment Control Gigashot lasers need a clean dry environment to prevent failure The Gigashot laser is not hermetically sealed there is potential for molecular water vaporization through the o ring seal The humidity inside of the laser enclosure is controlled with a desiccant which should be replaced before it is expired It is very important to keep the laser head dry and free of water condensation at all times The lithium triborate crystal is a key component for the laser Lithium triborate is a slightly hygroscopic material Condensation on any optical surface will cause laser damage As discussed in Chapter 3 System Details the relative humidity is related to the ambient temperature The relative humidity is high when the laser is cool and it decreases as the laser is warmed up When the relative humidity exceeds the threshold the eDrive Nitro alerts the user with a beeping sound to
57. nce the maximum peak current of 175A is reached consider replacing diodes or upgrade the laser Please contact NG CEO for detailed information 2014 Northrop Grumman Systems Corporation 55 Gigashot Laser User Manual Chapter 5 Maintenance Optimize Laser Performance Optimization of the laser may be required when the laser is initially installed or the laser performance has degraded due to aging laser diodes For this procedure light should be emitting from the laser In the absence of any output please review Chapter 7 Troubleshooting or contact NG CEO for assistance To obtain the best performance small adjustments may optimize the laser To optimize the laser follow these steps 1 Wait for the laser reach thermal stabilization Both the laser bench temperature and environmental temperature significantly impact the laser power Wait for the laser to be thermally stabilized before attempting any adjustment 2 Check the settings of the controller and chiller Check the performance with all items set to the values on the laser ATP Test Report Data Summary Verify that all of the Controller and GUI settings are correct The coolant flow rate and coolant temperature have a significant impact on the laser performance Make sure that the flow rate and the temperature of the chiller match results from the original ATP Test Report Data Summary 3 Peak up the laser power by tuning the temperature of the TEC controller if the TE
58. nnecting the Chiller PolyScience 6000 Series Power Up Procedure First Time Laser Power Up Procedure Daily Operation Adjusting the Laser System The purchaser is responsible for any loss or injury during installation and use of the laser system NG CEO recommends that a qualified service technician install and maintain the laser If you intend to service the laser yourself please comply with the following procedures 2014 Northrop Grumman Systems Corporation 31 Gigashot Laser User Manual Chapter 4 Installation and Operation Laser System Components Before installing be familiar with the components of the laser system see Figure 4 1 Q Switch Power Cable Q Switch Trigger Cable Filter Housing and Filter Controller to Computer Cable Laser Signal Cable Figure 4 1 Components for the Gigashot Laser 2014 Northrop Grumman Systems Corporation 32 Gigashot Laser User Manual Unpacking the Laser System Chapter 4 Installation and Operation Your NG CEO Gigashot laser was carefully packed for shipment If its carton appears to have been damaged in transit have the shipper s agent present when you unpack Inspect the unit as you unpack it looking for dents scratches or other evidence of damage If you discover any damage immediately file a claim against the carrier and notify NG CEO technical service NG CEO will arrange for repair without waiting for settlement of your claim Keep the sh
59. nput pressure of approximately 49 psi is required at the laser housing Chiller pressure may be several psi higher if additional filtering flow metering fittings and long runs of coolant tubing are used Coolant used in the system must be compatible with the materials used in the internal coolant lines of the laser Tap or de ionized water must be avoided because of corrosion and mineral deposits NG CEO can supply an approved coolant for this application 2014 Northrop Grumman Systems Corporation 12 Gigashot Laser User Manual Chapter 2 Laser Safety Please read this chapter carefully before installing or operating your laser An NG CEO trained service engineer should perform all service and repair operations If you plan to service your laser please follow the procedures in Chapter 5 Maintenance Sections in this chapter include Safety Overview Precautions for Safe Operation Center for Devices and Radiological Health Compliance 2014 Northrop Grumman Systems Corporation 13 Gigashot Laser User Manual Chapter 2 Laser Safety Safety Overview Safe operation of any laser should be reviewed prior to any new installation of the Gigashot laser CAUTION The Gigashot laser is a Class IV high power laser whose beam is by definition a safety hazard Avoid eye or skin exposure to direct or scattered laser radiation Avoid direct viewing of the beam or its specular reflection Follow the instructions co
60. nside the laser Improper adjustment of operating parameters may lead to a decrease in beam diameter and will result in optical damage For this reason all parameters are well controlled through the user interface Please contact the factory if the laser must be operated outside specified operation parameters Timing Unit The timing unit provides three key functions for the laser system 1 The timing unit provides the trigger signal to the eDrive Nitro at a fixed frequency so the laser diodes will pump the Nd YAG rod at a stable average power It is very important to have the correct thermal lensing in order to make an unstable laser work properly 2 The timing unit provides the trigger signal to the Q switch driver When the Nd YAG rod is excited by the pumping light it takes time for the population inversion to build up The delay between pumping light and Q switching can be varied precisely by the timing unit The output pulse energy can be adjusted by changing the delay The optimal delay time results in maximum output energy with minimal jitter Because of the high flexibility of the timing unit the trigger frequency to the Q switch driver can either be the same as the frequency of pumping light or can be reduced by a factor of N where N is an integer 3 The timing unit provides synchronized trigger signals for other device s The synchronized trigger signal can be configured to match the trigger signal to the eDrive Nitro or to the Q s
61. nt cartridge must be replaced regularly so it should be checked at least weekly for exhaustion Exhaustion is indicated by a change in the color of the indicator paper in the top of the cartridge While any sector of the indicator paper in the cartridge top remains blue the cartridge can still absorb water When all sectors of the indicator paper turn completely white or light pink the cartridge has absorbed all the water it can and must be replaced Replacement frequency varies with the humidity in your operating environment and if the laser head is opened WARNING Waiting to replace desiccant until all sectors on desiccant cartridge have turned white will result in optical damage If the desiccant cartridges are exhausted in a short time frame e g two weeks without the laser head having been opened contact NG CEO technical service A second desiccant cartridge is recommended to reduce the time the desiccant cartridge is removed from the Gigashot laser cover during service Any spare desiccators should be stored in a cool dry area A nitrogen purged dry box is recommended for storage 40 Gram Desiccant Cartridge The 40 Gram Desiccant Cartridge Figures 5 3 and 5 4 is used on Gigashot lasers Figure 5 1 40 Gram Desiccant Cartridge Top Figure 5 2 40 Gram Desiccant Cartridge Bottom To service the desiccant the following supplies are required Desiccant supplies can be purchased from NG CEO or directly from AGM Containe
62. ntained in this manual for proper installation and safe operation of your laser We recommend the use of protective eyewear at all times the type of eyewear depends on the energy and wavelength of the laser beam and operating conditions Consult ANSI ACGIH or OSHA standards for guidance CAUTION Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure WARNING Atall times during installation operation maintenance or service of your laser avoid exposure to laser or collateral radiation exceeding the accessible emission limits listed in Performance Standards for Laser Products U S Code of Federal Regulations 21 CFR 1040 10 d Precautions for Safe Operation Avoid looking directly into the laser beam or at specular reflection even with protective eyewear on Wear laser safety eyewear that is optically dense at the wavelengths of operation 798 816 nm pump light 1064 nm fundamental 532 nm second harmonic 355 nm third harmonic and 266 nm fourth harmonic Provide a controlled access area for laser operation and limit access to those trained in laser safety principles Post warning signs in prominent locations near the laser operation area Use safety interlocks on all entryways All NG CEO system control electronics are supplied with interlock inputs that can be used to preclude operation with an open safety door Enclose beam
63. nuals and we appreciate all suggestions Date Name Company or Institution Department Address Laser Model Number Serial Number Chiller Model Number Serial Number eDrive Model Number Serial Number Laser Manufacture Date Total Laser Lifetime shots 2014 Northrop Grumman Systems Corporation 66 Gigashot Laser User Manual Appendix A Customer Service Questions What is the coolant flow rate GPM What is the set temperature on the chiller C What is the coolant pressure on chiller PSI What are the temperature set and actual reading from TEC controller C What are the set current and actual current from eDrive A Is Q switch enabled yes no Is Q switch triggered internally or externally What is the pulse repetition frequency Hz Is the output power measured directly from the laser yes no What is the measured power W When did the problem happen Have you changed any settings recently yes no Have you adjusted the laser to try to fix the problem yes no 2014 Northrop Grumman Systems Corporation 67 Gigashot Laser User Manual Appendix A Customer Service What are the changes made recently to the system Please describe the problem or laser behavior as detailed as possible Suggestions Email or fax to Northrop Grumman Cutting Edge Op
64. o ATP Test Report Data Summary seas are Automatic display of temperature Read out emperature 2014 Northrop Grumman Systems Corporation 29 Gigashot Laser User Manual Chapter 4 Installation and Operation Gigashot is a high energy and high peak power laser It is dangerous to handle Please read all safety instruction as well as other notes cautions and warnings in the manuals To ensure safe operation of the Gigashot laser system please be familiar with the Chiller User Manual the DC Power Supply manual eDrive user manual and timing unit manual before beginning a laser procedure NOTE Focused back reflections of even a small percentage of the output energy of the Gigashot laser can destroy its optical components To illustrate consider an uncoated convex lens which reflects about 4 of the energy incident on each of its surfaces While the reflection off the first surface diverges harmlessly the reflection off the second focuses and the power density at the point of focus is high enough to destroy the Q switch Nd YAG rod and output coupler of the laser Even antireflection coated optics can reflect enough energy to damage optical components of the laser The high peak power density laser beam can also ablate any materials in the laser The ablation will generate the contamination which results in expensive optical damage WARNING The Gigashot warranty does not cover damage caused by focused back ref
65. occurs Table 3 2 Avoid with Chillers Avoid with Chillers De ionized water Iron or aluminum parts in plumbing loop Operation below air condensation temperature The Gigashot laser has exposed bare copper inside the coolant loop For this reason NG CEO does not recommend using untreated de ionized DI water If DI water is used as the coolant it is important to maintain the water resistivity between 300 and 700 K ohms and to keep the water slightly basic i e keep the water above 8 0 pH The Gigashot laser is environmentally sealed but not hermetically sealed Atmospheric conditions near the exterior of the laser will mimic conditions inside laser head 2014 Northrop Grumman Systems Corporation 20 Gigashot Laser User Manual Chapter 3 System Details Operating the Chiller WARNING Do not operate laser without cooling Inadequate heat dissipation will seriously damage the laser diodes and will void warranty If you notice coolant in the immediate vicinity of the laser shut the laser system down immediately Check to see if the coolant is coming from the laser head If so return the laser for repair If not repair the source of the leak and allow the unit to dry thoroughly before resuming operation The laser system has a coolant loop to prevent thermal damage to the laser diodes The diodes should be kept at approximately 20 C to 35 C See the ATP Test Report Data Summary included with your la
66. onment A power meter with the ability to handle the maximum power of the laser should be installed approximately 0 5 meter away from the laser in the direction of the laser output beam To protect the power meter a negative lens f 100 mm with an anti reflective AR coating at output wavelength should be installed in front of the power meter as shown in Figure 4 2 below If a negative lens is not available only a small portion of the laser power should be measured by a beam sample so that the power density is below the damage threshold of the power meter The power should be calibrated in this way A pulse detector should be positioned as shown in Figure 4 2 to verify the pulse characteristics of the laser Figure 4 2 Basic Setup for the Laser Power Test 2014 Northrop Grumman Systems Corporation 34 Gigashot Laser User Manual Chapter 4 Installation and Operation Controller Setup Ac Input Power 240V 10 Before you can use the controller you must provide the proper AC input power requirements The controller is shipped with a kit of connector and strain relief parts to assemble using the procedures in the section CAUTION Obstructing the air inlets and or exhaust may cause fire and irreversible damage to the components inside the cabinet Table 4 1 AC Requirements for Controller 50 60 Hz AC Input Fuse Ratings T 10A 250V Fuse Dimensions 0 25 x 1 25 inches Clearance You must allow at le
67. oscilloscope Confirm that the value is 245 to 255us 2014 Northrop Grumman Systems Corporation 46 Gigashot Laser User Manual 10 Chapter 4 Installation and Operation Allow the laser system to run for at least 20 minutes in order to achieve thermal stabilization Single click the SHUTTER button on the GUI to open the laser shutter and begin laser output Gradually increase the Q switch trigger delay to just above the threshold Move the negative lens and power meter so that the beam is going through the center of the lens and hitting the center of the power meter Once the TEC and chiller temperatures have stabilized gradually increase the Q switch delay to the value specified in the ATP Test Report Data Summary Don t touch any part of the laser and wait for the laser to stabilize for 1 hour the laser typically takes around 20 minutes to reach 95 of the maximum power Verify that the power measurement approximates that reported on the ATP Test Report Data Summary Optimize the laser by making slight adjustments to the HR to minimize the delay between the Q switch trigger signal and the laser pulse to maximize output power Slightly change the Q switch trigger delay for best pulse to pulse stability Optimize TEC temperature for harmonic power Usually the laser needs optimization for the first installation due to the slight differences of environments chiller settings and vibration of the transportation If so please
68. ow rate calibration may be required Please refer to the chiller user manual for instructions on calibration 4 Run the chiller for approximately 1 2 hour to allow the coolant temperature to stabilize at the set point Turn on Controller Flip the power switch on the rear panel of the controller to the ON or position Make sure that the red EMERGENCY STOP button of the eDrive Nitro is released Turn the key switch to the ON position If the key switch is in the OFF position a fault will occur Flip the power switch on the front panel of the DC power supply to the ON or position Launch the Gigashot Laser System Controller GUI from the computer Ensure that the ready signals at the top of each section of the GUI are green indicating that communication is established Verify the GUI parameter settings are set correctly according to the ATP Test Report Data Summary 2014 Northrop Grumman Systems Corporation 44 Gigashot Laser User Manual Chapter 4 Installation and Operation Key Switch eDrive Nitro Power Switch on DC Power Supply Timing Unit Figure 4 8 Front Panel of Controller Set Up Test Equipment 1 Verify that there are no objects in the laser beam path except for the negative lens and power meter 2 Connect SYNC 1 OUT from the rear controller panel to channel 1 of the 4 channel oscilloscope Connect SYNC 2 OUT from the rear controller panel to channel 2 Connect CURRENT MONITOR from
69. paths wherever possible And set up energy absorbing target to capture the laser beam preventing unnecessary reflections or scattering Set up experiments so the laser beam is below eye level Work in an area that is well lighted to avoid dilation of pupils 2014 Northrop Grumman Systems Corporation 14 Gigashot Laser User Manual Chapter 2 Laser Safety Set up a target for the beam Set up shields to prevent reflected beams from escaping the laser operation area View an infrared laser beam with a protected image converter at an oblique angle reflecting from a diffuse surface Ensure that all electrical connections are made in a safe manner Position equipment so that electrical connections are shielded from accidental touch Focused back reflections of even a small percentage of the output energy of the Gigashot laser can destroy its optical components To illustrate consider an uncoated convex lens which reflects about 4 of the energy incident on each of its surfaces While the reflection off the first surface diverges harmlessly the reflection off the second focuses and the power density at the point of focus is high enough to destroy the Q switch Nd YAG rod and output coupler of the laser Even antireflection coated optics can reflect enough energy to damage optical components of the laser The high peak power density laser beam can also ablate other materials in the laser The ablation will generate the
70. r Controls Inc telephone number 800 995 5590 2014 Northrop Grumman Systems Corporation 52 Gigashot Laser User Manual Chapter 5 Maintenance Desiccant cartridge NG CEO part no 42 228 Refill part number 643665 Refill tool 980412 Remove the desiccant cartridge from the top cover of the laser housing Use the refill tool to remove the retainer ring and exchange the desiccant The refill package contains 50 grams of desiccant Fill the cartridge to the counter bore surface where the filter is mounted Do not overfill Fill as shown in Figure 5 5 Make sure that there are no desiccant beads on the surface where the filter is mounted Install the paper filter then the screen then the retainer ring Hand tighten the retainer ring with the refill tool Replace the desiccant cartridge immediately to minimize the amount of time that the desiccant cartridge is removed from the laser housing Tighten the desiccant cartridge by hand DO NOT OVERTIGHTEN l MOLECULAR SIEVE GRADE 4A 8 TY 50 GRAM 5 GM CONTAINER CONTROLS T DOM 10 13 Figure 5 3 50 Gram Refill and Refill Tool WARNING Do not operate the laser without a functional desiccant cartridge Condensation on the diode arrays or other optics can seriously damage the laser and may void warranty 2014 Northrop Grumman Systems Corporation 53 Gigashot Laser User Manual Chapter 5 Maintenance Clean and Maintain Chiller The 5 um filter and cool
71. rvice or obtain a copy of the complete warranty statement please contact your nearest NG CEO sales and service office EXCEPT AS PROVIDED IN THIS SUMMARY OR THE APPLICABLE WARRANTY STATEMENT NG CEO MAKES NO WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUPOSE IN NO EVENT SHALL NG CEO BE LIABLE FOR INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of NG CEO Trademarks Gigashot eDrive eDrive Nitro and Timing Engine are registered trademarks of Northrop Grumman Corporation Patents Northrop Grumman Corporation products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved 2014 Northrop Grumman Systems Corporation il Gigashot Laser User Manual Safety Information Product End of Life Handling NG CEO is committed to protecting the environment In accordance with the Waste Electrical and Electronic Equipment directive WEEE and Restriction of Hazardous Substances in the European Union RoHS EU directives NG CEO acc
72. s sensitive to perturbations Verify the operating current is stable Verify the Q switch hold off is good 2014 Northrop Grumman Systems Corporation 64 Gigashot Laser User Manual Chapter 7 Troubleshooting Controller Operation The following issues may occur in relation to the Gigashot laser The eDrive Nitro has built in diagnostics to alert the user of fault conditions Common error reports and suggested remedies follow Consult the eDrive Nitro User Manual for more details Chiller Fault Detected Flow Interlock Fault Check chiller for operation and low coolant level Hardware Fault Detected Check that the Emergency Stop button is not depressed Check INTERLOCK input on back panel for open condition Cover Interlock Fault Detected Verify that the cover is secure on the laser Check cable connections to laser Channel Over Temperature Fault Verify the eDrive Nitro fans are operational Verify that the airflow through the driver is not obstructed 2014 Northrop Grumman Systems Corporation 65 Gigashot Laser User Manual Appendix A Customer Service This form has been provided to encourage you to tell us about any difficulties you may have experienced while using your NG CEO instruments or user manuals Call or write our customer service department to bring attention to problems that you may not have personally experienced We are always interested in improving our products and ma
73. s well by turning it clockwise until it stops 5 Laser Power Connection Connect the female connector of the diode power cable to the J2 connector on the laser head ALIGNMENT ACCES gt HORIZ ADJ Figure 4 6 Gigashot Laser Connections 2014 Northrop Grumman Systems Corporation 40 Gigashot Laser User Manual Connections on Controller Chapter 4 Installation and Operation xT TRI 1 NT aS h W m SR O O O O O ai UR o 9 000 O Q 2 0 070000 0 Figure 4 7 Controller Rear Panel Schematic Table 4 4 Controller Rear Panel Information Item Description POWER Powers on all components of the controller FUSE 1 10A 250V 0 25 x 1 25 inches FUSE 2 10A 250V 0 25 x 1 25 inches AC IN 208 240 V 10 A 50 60 Hz single phase AC input connector AC OUT Computer USB Connects to communicate with the computer CHILLER Chiller Interlock DB9 connector CHILLER RS232 Provides communication with the chiller DB9 connector LASER CONTROL LASER POWER Laser Controller signal cable connects to J1 on rear panel of laser Power cable connects to J2 on rear panel of laser SMA connector provides LASER TRIG Q switch trigger connects to QSW TRG IN on rear panel of laser BNC connector provides 24V DC to Q switch connects to 24 VDC on rear panel of laser EXT TRIG IN BNC connector allows an external host system to trigger the laser at spec
74. ser for optimum temperature and flow rate settings Operating the laser diodes without coolant for even a short period of time even 1 second will cause permanent damage To help prevent this all NG CEO drive electronics are equipped with a coolant interlock This interlock interrupts drive current to the diodes when coolant flow rate drops below a set point When setting up the laser system for the first time NG CEO recommends testing the flow interlock before firing Turn the controller on without current applied to the laser and then turn the chiller off A fault should be reported By testing the interlock with no current to the laser there is no risk of damaging the laser NOTE The chiller must run continuously to prevent biological growth or corrosion If the laser system is to be shut down for more than 1 week the chiller should either be left running or drained and the coolant loop purged with oil free dry filtered air or N2 per the Prepare for Shipment section of this manual WARNING Do not operate the coolant system below the air condensation temperature dew point at the laser head Condensation on the diode arrays can seriously damage the laser head and will void the warranty Consult NG CEO technical service if you have any questions 2014 Northrop Grumman Systems Corporation 21 Gigashot Laser User Manual Chapter 3 System Details Air Condensation Temperature The air condensation temperature or
75. the interlock is broken the controller will be powered off and the laser will stop lasing The chiller will continue to run Once the continuity of the interlock is satisfied the fault in the controller must be cleared and the system must reset to restart the laser For other interlock configurations please contact NG CEO CAUTION Never look at the laser beam path even if the laser is off as the laser beam could be powered automatically Shut Down Procedure 1 Itis not necessary to use any buttons or the key switch on the front panel of the controller in order to turn off the laser 2014 Northrop Grumman Systems Corporation 48 Gigashot Laser User Manual Chapter 4 Installation and Operation Single click the SHUTTER button on the GUI to stop lasing The Laser Output indicator in the eDrive section of the GUI will turn black Single click the STOP on the GUI to cease diode emission The controller will be inactive after this step The indicators for Output Active in the Power Supply and eDrive sections will be black 4 Let Chiller run for 2 minutes 5 6 7 Close the GUI Turn off the controller with the power switch on the rear panel Turn off the chiller Adjusting the Laser System WARNING Any parameter change while the laser is operational may damage the laser Operating outside the specified ranges given in the ATP Test Report Data Summary may damage the laser Change the Parameter Set
76. the rear controller panel to channel 3 Connect photo detector to channel 4 of the oscilloscope 4 Use channel 1 as the trigger source Figure 4 10 shows a screenshot of all 4 signals when the laser is running 2014 Northrop Grumman Systems Corporation 45 Gigashot Laser User Manual Chapter 4 Installation and Operation lok St Chi Freq 110 0 H2 Ch1i chasrsr gt 1 605 ch3 width 257 1s 4 ih 1 00 V Ch2 1 00 VY 2 M2 00ms Chi f 1 86V 613 1 00 Y Q2 Ch4 1 00 V 0 16 Apr 2014 15 14 11 00 Figure 4 9 Four Channel Oscilloscope Screenshot Laser Emission WARNING Wear proper laser safety eyewear to protect your eyes ELECTRICAL WARNING The voltages in this system can be harmful or even lethal Whenever handling or servicing the laser always disconnect the power cord to the power supplies and drivers Allow at least five 5 minutes for all electronics to discharge before touching or grounding of electrical connections 1 Once temperatures are stabilized set the Q switch trigger delay to 170us Single click the START button on the GUI An audible warning will be heard and the emission light on the eDrive Nitro will flash The indicators for Output Active in the Power Supply and eDrive sections will be green 2 Measure the frequency of channel 1 Confirm the frequency with the GUI after the laser is powered on 3 Measure the pumping current pulse width on channel 3 of the
77. tings There are two types of parameter settings Some settings may be changed during laser operation such as chiller Set Temperature Set TEC temperature and Q switch trigger delay Some settings may be locked to prevent laser damage These settings will appear as gray text when the laser is running See Chapter 3 System Details In order to change settings that are locked perform the following steps 1 2 Single click the SHUTTER button the GUI to stop lasing Single click the STOP button on the GUI to cease diode emission 3 Change the desired parameter using the GUI See the ATP Test Report Data Summary for reference Resume operation by single clicking the START button on the GUI and then single clicking the SHUTTER button on the GUI The laser will resume operation with audible warning and the indicator lights will display green Warm up for one hour not necessary if laser has been operating Optimize laser per the Optimize Laser Performance section in Chapter 5 Maintenace Fine Tune TEC temperature Fine Tune Cavity Mirrors NOTE For lasers exceeding 200 million shots usage cooling fluid temperature may need to be optimized Increasing the diode current or pulse width may be needed as well 2014 Northrop Grumman Systems Corporation 49 Gigashot Laser User Manual Chapter 5 Maintenance The chapter contains information in these sections Prepare for Shipment Purge Housing Replace Desicc
78. tlet wired with 14 gauge or larger diameter wire The use of an extension cord is not recommended NOTE The chiller may be located at a level below that of the equipment being cooled As long as the process remains closed overflow will not occur when adding cooling fluid to the chiller reservoir Oxygen Depletion Risk Clearance In the event of a refrigerant leak refrigerant gas may displace oxygen that could result in suffocation and death Never place the chiller in a room that is smaller than the minimum room volume requirement as defined below If the room is ventilated the air distribution system must be analyzed to determine the worst case distribution of leaked refrigerant A leak detector alarm device is always required in a ventilated room that does not meet the minimum room volume given below Assure adequate and sufficient room volume and ventilation before placing a chiller that contains refrigerant in a room Contact Polyscience at 800 229 7569 if you have any concerns or questions Pounds of refrigerant charge can be read directly from the nameplate on your chiller Remember to include in your calculation any refrigerant that may be stored in any other containers Minimum Room Volume Pounds of refrigerant x 110 cubic feet Example Two chillers are placed in a room each containing 6 pounds of refrigerant The minimum room volume shall be 12 x 110 cubic feet or 1 320 cubic feet Adequate clearance should be
79. tronics Inc 20 Point West Boulevard Saint Charles MO 63301 USA Phone 636 916 4900 Fax 636 916 4994 Email ngceoservice ngc com 2014 Northrop Grumman Systems Corporation 68 Gigashot Laser User Manual Appendix B System International Units The following System International SI units abbreviations and prefixes are used throughout NG CEO user manuals Quantity Unit Symbol Abbrv Prefixes mass gram g tera 10 T length meter m giga 10 G time second s mega 10 M frequency Hertz Hz kilo 1 0 k force Newton N deci 107 d energy Joule J centi 1 0 0 power Watt Ww milli 10 m electric current Ampere A micro 1 0 u electric charge Coulomb 0 nano 10 n electric potential Volt V pico 10t p resistance ohm Q femto 10 f inductance Henry H atto 10 a magnetic flux Weber Wb magnetic flux Tesla T density luminous intensity candela cd temperature Kelvin K 2014 Northrop Grumman Systems Corporation 69 Gigashot Laser User Manual Acronym ACGIH ANSI AO AR ASM CDRH CEO CFR CW DC DPSS EO ESD FET FDA FPS FWHM GaAlAs GPM HeNe HG HM HR HV IEC IR KTP 2014 Northrop Grumman Systems Corporation Appendix C Acronyms Description American Conference of Governmental Industrial Hygienists American National Standards Institute Acusto Optical type of Q switch Anti Reflective Array Sub
80. ulate for 5 minutes 5 Drain system completely as detailed in steps 1 and 2 Fill the chiller with a 3 solution of Hydrogen Peroxide Care should be taken to ensure that the mixture completely fills to the top of the reservoir to ensure all wetted surface areas of the chillers are cleaned Cycle the chiller on and off Top off the reservoir as necessary to ensure it is full of the cleaning solution Ensure that the cap of the chiller reservoir is loose or remove it completely to allow gas to escape from the system Circulate the cleaning solution through the system including the laser module for 40 minutes 8 Drain the cleaning solution mixture from the chiller as detailed in steps 1 and 2 Refill and circulate distilled water for 5 minutes and drain Ensure that the cap of the chiller reservoir is loose or remove it completely to allow gas to escape from the system 2014 Northrop Grumman Systems Corporation 54 Gigashot Laser User Manual 10 11 12 13 14 15 16 17 Check Hold Chapter 5 Maintenance Drain the chiller and dispose of the filter Disconnect the chiller from the laser module and blow out water from the laser module coolant loop prior to refilling the chiller coolant reservoir Reconnect the laser module coolant loop Install new 5 micron filter into housing Record cleaning date on sticker with a one month reminder to drain amp clean the system Affix sticker to chiller or cabinet
81. witch driver Harmonic Generation The harmonic generation HG device is a lithium triborate LBO crystal cut at a special angle For instance in a second harmonic generation crystal this special angle provides phase matching between the fundamental waves in the beam and the waves generated at 532 nm at room temperature Phase matching and efficient conversion is sensitive to the angle of the unidirectional beam It is also sensitive to the temperature of the HG crystal As a result it is necessary to provide a stable mechanical and thermal environment for the HG crystal Phase matching conditions can be met by mechanical angular adjustment of the HG crystal or by varying the temperature of the HG crystal electrically Stability and reliability considerations lead to a mechanically fixed HG crystal with fine tuning accomplished electrically 2014 Northrop Grumman Systems Corporation 8 Gigashot Laser User Manual Chapter 1 Introduction The temperature of the HG crystal is controlled with the thermal electric cooler TEC The performance parameters are optimized with a crystal temperature between 20 C and 50 C Once this temperature is identified and fixed the temperature of the crystal can be stabilized to within 0 1 C with the TEC controller Warm Up Laser System The thermal load on the laser head and the chiller varies when the operating current is changed It takes several minutes for the chiller to stabilize the te

Patara HP Green Laser - CEO Knowledge Center

Contents

Download Pdf Manuals

Related Search

Related Contents