User Manual - CEO Knowledge Center
Contents
1. 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 10 k force Newton N deci 107 d energy Joule J centi 1 0 C power Watt W milli 10 m electric current Ampere A micro 1 0 u electric charge Coulomb C nano 10 n electric potential Volt V pico 1075 p resistance ohm Q femto 1075 f inductance Henry H atto 1077 a magnetic flux Weber Wb magnetic flux Tesla T density luminous intensity candela cd temperature Kelvin K Northrop Grumman Corporation 32 Pulsed RB plus User Manual Appendix C Acronyms Acronym ACGIH ANSI AR AO CDRH CEO CFR CW DC EO ESD FET FDA FWHM GaAlAs GPM HR HV KTP LBO Northrop Grumman Corporation Description American Council of Government Industrial Hygienists American National Standards Institute Anti Reflective Acusto Optical type of Q switch Center for Devices and Radiological Health U S Food and Drug Administration Cutting Edge Optronics Incorporated Code of Federal Regulations Continuous Wave Direct Current Electro Optical type of Q switch Electro Static Discharge Field Effect Transistor U S Food and Drug Administration Full Width Half Max Gallium Aluminum Arsenide Gallons Per Minute High Reflector High Voltage Infrared Potassium Titanyl Phosphate Lith2. Terminals Figure 3 2 Reverse Bias Protection Diode Circuit NG CEO drive electronics are designed to detect the shorted reverse protection diode and suspend drive current before damaging the laser diodes Customers who use third party manufactured drive electronics must configure them for use with NG CEOs reverse bias protection diodes The driver should be able to detect the shorted condition because with a short across the array the full power supply voltage will Northrop Grumman Corporation 16 Pulsed RB plus User Manual Chapter 3 Operation suddenly be impressed across the driver control FETs For drivers which have a fixed power supply voltage a much larger voltage across the drive FETs will increase the heat load and cause a dramatic rise in their temperature For third party drivers which have the capability to servo the voltage to produce the necessary current a sudden decrease in output voltage should cause a corresponding large decrease in the voltage required internally within the driver which could be detected and reported If any of the conditions are detected the driver should suspend diode drive current and send the operator an error message Closed Loop Chiller The single most common cause of laser module return for repair involves customer damage More than one third of all customer damaged laser modules involve cooling problems Coolant problems almost always require the replacement of t
3. Northrop Grumman Corporation 8 Pulsed RB plus User Manual Chapter 2 Laser Safety Precautions for Safe Operation of Class IV Lasers Never look directly into the laser beam or at specular reflection even with protective eye wear on Always wear laser safety eye wear that is appropriate for the output power at the wavelengths of operation 808 nm pump light and 1064 nm fundamental Set aside a controlled access area for laser operation limit access to those trained in the principles of laser safety Post readily readable warning signs in prominent locations near the laser operation area Use safety interlocks on all entryways All NG CEO system control electronics are provided with interlock inputs to preclude operation with an open safety door NOTE when multiple interlocks are used they must be connected in SERIES for proper function Restrict access to laser areas to those who have been instructed in the necessary safety precautions Enclose beam paths wherever possible Set up experiments so the laser beam is below eye level Work in an area that is well lit to avoid dilation of pupils Set up a target for the beam Setup shields to prevent reflected beams from escaping the laser operation area The Q switched output power of the laser emits extremely high peak optical powers powers that can severely damage a wide array of optical components and detectors Know the limits of your components b
4. 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 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 O I On 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 Northrop Grumman Corporation iv Pulsed RB plus User Manual Laser Emission Use caution Shock Hazard Use caution Caution Risk of danger Refer to manual Chassis Ground eee Northrop Grumman Corporation V Pulsed RB plus User Manual General Safety S
5. Department Address RB Plus Model Number Serial Number Chiller Model Number Serial Number eDrive Model Number Serial Number RB Plus Manufacture Date RB Plus Operating Hours Northrop Grumman Corporation 29 Pulsed RB plus User Manual Questions What is the coolant flow rate GPM Appendix A Customer Service What is the set temperature on the chiller C What is the coolant pressure on chiller PSI What are the set current and actual current from eDrive A What is the laser cavity configuration What is the measured CW power W When did the problem happen Have you changed any settings recently yes no Northrop Grumman Corporation 30 Pulsed RB Plus User Manual Appendix A Customer Service What are the changes made recently to the system Please describe the problem or RB Plus behavior as detailed as possible Suggestions Email or fax to Northrop Grumman Cutting Edge Optronics Inc 20 Point West Boulevard Saint Charles MO 63301 USA Phone 636 916 4900 Fax 636 916 4994 Email st ceolaser info ngc com Northrop Grumman Corporation 31 Pulsed RB plus User Manual Appendix B System International Units The following System International SI units abbreviations and prefixes are used throughout NG CEO user manuals
6. C Optical Center from Base 1 75 inches Module Dimensions 2 55 H x 3 30 W x 3 07 L inches CEO recommends Optishield Plusru distilled water coolant 10 Optishield Plustu 90 distilled water CEO modules are leak tested to 80 psi with Nitrogen gas CEO recommends 50 psi of chiller coolant for actual operation Northrop Grumman Corporation 6 Pulsed RB plus User Manual Chapter 2 Laser Safety Please read this section carefully before installing or operating your Pulsed RB Plus module We recommend that all service and repair operations be performed by a NG CEO service engineer If you do plan to service your laser module please follow the procedures in the Service section of this manual Sections included in this chapter provide the following information Caution amp Warning Statements Precautions for Safe Operation of Class IV Lasers Center for Devices and Radiological Health CDRH OEM Product Safety Device Checklist Northrop Grumman Corporation 7 Pulsed RB plus User Manual Chapter 2 Laser Safety Caution amp Warning Statements WARNING The NG CEO RB P us component when used as a laser oscillator 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 When energized a large amount of high power invisible laser radiation is emitted fro
7. Introduction Theory of Operation NG CEO diode pumped solid state lasers and pump modules use temperature tuned GaAlAs laser diodes These diodes replace arc lamps or incandescent light sources as the optical pump source The principal advantages of this approach include Longer lifetime More compact size Elimination of the need for external cooling tower water Reduced thermal lensing in the active medium The Pulsed RB Plus module utilizes a radial transverse pump geometry to excite the solidOstate laser medium Exterior components and connections are shown in Figure 1 1 The laser medium is either a 2 mm or 3 mm diameter by 63 mm long rod of neodymium doped yttrium aluminum garnet Nd Y AG Both ends of the rod are optically polished and include anti reflection coatings at the lasing wavelength The rod may include curvature to compensate for thermal lensing depending on module configuration The RB P us module is available in Nd Y AG with the laser rod AR coated for the highest gain wavelength of this material 1064 nm The RB Plus module is constructed within a durable and rigid structure The diode optical output power is radially coupled into the laser rod Northrop Grumman Corporation 1 Pulsed RB plus User Manual Chapter 1 Introduction Screw On Beam Tube Support Hour Counter Electrical Contacts shown with short Water Inlet Outlet ing cover Figure 1 1 Exterior Components and Conne
8. adjustment of control electronics do not require exposure to laser radiation Northrop Grumman Corporation 12 Pulsed RB plus User Manual Chapter 3 Module Details This chapter describes basic operation of your Pulsed RB Plus module This chapter discusses Unpacking your Module Pulsed RB Plus Module Closed Loop Chiller Northrop Grumman Corporation 13 Pulsed RB plus User Manual Chapter 3 Operation Unpacking your Module Your NG CEO Model RB Plus module was carefully packed for shipment If the carton appears to have been damaged in transit have the shipper s agent present when you unpack CAUTION The module is susceptible to damage due to electro static discharge ESD Always use proper ESD control devices when handling the module CAUTION Do not open sealed package until package has normalized to room temperature Condensation can seriously damage the diode arrays in the laser module and may void warranty 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 your NG CEO representative NG CEO will arrange for repair without waiting for settlement of your claim Keep the shipping 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
9. module should be operated inside an area that is purged with nitrogen N2 or encased in a sealed enclosure with a desiccant Northrop Grumman Corporation 22 Pulsed RB plus User Manual Chapter 4 Maintenance The RB Plus module is factory assembled by trained technicians at NG CEO Most service and maintenance needed by the RB Plus module should be addressed to your NG CEO field service engineer Refer to Chapter 5 Service for complete information on this topic The chapter contains information in these sections Rod Removal and Replacement RodCleaning Leak Test Procedure Northrop Grumman Corporation 23 Pulsed RB plus User Manual Chapter 4 Maintenance Rod Removal and Replacement Beam Tube Support Retainer Cap The only user serviceable part in the RB Plus module is the Nd Y AG rod which can be replaced by the user Y AG rods rarely break frequent replacement may be a sign of another problem in the RB P us module Contact NG CEO if you have any further questions CAUTION The module is susceptible to damage due to electro static discharge ESD Always use proper ESD control devices when handling the module CAUTION Ensure gloves or finger cots are worn during this procedure and that it is carried out in a clean environment preferably under a laminar flow hood O Ring Rod O Ring 2 56 screws ne gt e q pO Retainer Tube Cap Support Figure 4 1 Rod Replacement Drawing Remo
10. 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 eDrive and RB Plus 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 Northrop Grumman Corporation ii Pulsed RB plus 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 accepts the return of our products for disposal When you are ready to rec
11. C 10 13 16 19 22 25 28 31 34 37 40 Temperature C Figure 3 1 Constant Dew Point Lines for Ambient Temperature and Relative Humidity Northrop Grumman Corporation 21 Pulsed RB plus User Manual Chapter 3 Operation Table 3 3 Table of Air Condensation Temperature at Given Ambient Air Temperature Celcius and Relative Humidity percent Relative Humidity 196 10 20 30 40 5096 60 70 80 90 100 10 43 9 20 2 11 9 6 8 3 0 0 1 2 6 4 8 6 7 8 4 10 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 20 3 22 3 24 0 Air Temperature C 28 33 0 6 5 2 9 8 8 13 1 16 6 19 5 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 18 5 22 1 25 1 27 7 30 0 32 1 34 0 36 28 3 0 4 9 5 15 7 20 2 23 9 27 0 29 6 32 0 34 1 36 0 40 26 0 2 6 12 7 19 1 23 8 27 66 30 7 33 5 35 9 38 0 40 0 If required to operate a laser in conditions near to the condensation temperature take precautions to keep the RB module dry The
12. C 800 W RBA30 3P 70A 756 W 6350T21CE30E 996 W Specifications RB Plus modules are tested to exceed the following specifications The standard production test configuration consists of a 165 5 mm cavity utilizing a 0 75 mcc high reflector and a flat 40 reflective output coupler Table 1 2 Pulsed RB Plus Series Model Specifications1 RBA20 RBA30 MODEL 2P 3P 4P 2P 3P 4P Rod Size 2x63 3x63 mm Diode Bias 40 45v 60 70V 75 80 V 40 45 V 60 70 V 75 80 V Voltage Power Consumption 0 1800 0 2700 0 3200 0 1800 0 2700 0 3200 W Output EN 10 25 40 10 25 40 Specifications subject to change without notice g Output power from the production test cavity 165 mm 5 mm cavity utilizing a 0 75 mcc HR and flat 40 reflective output coupler 3At end of life Operating current x Diode voltage x 130 Northrop Grumman Corporation Pulsed RB Plus User Manual Chapter 1 Introduction Table 1 3 RB Plus General Specifications All RB Plus Series Models Type Pulsed Diode Pumped Nd YAG Rod Standard Dopant 0 6 Output Wavelength 1064 nm Pulse Repetition Rate 1 2000 Hz Duty Cycle max 15 Pointing Stability lt 5 of cavity divergence Nominal Peak Current 35 40 A Electrical Connection D sub connector Cooling Closed Loop Recycling Coolant Coolant Flow gt 1 0 GPM Coolant Pressure 50 PSI Operating Temperature 20 35
13. User Manual Pulsed RB Plus Diode Pumped Nd YAG Rod Laser Modules RBAXO XP CEO UMAN 0011 C NORTHROP GRUMMAN MARCH 2013 Worldwide Technical Support and Product Information www northropgrumman com Search ceolaser Hours 8 00 a m to 5 00 p m Central time Service and Technical Support 636 916 4900 follow prompts for department directory Email st ceolaser info 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 Northrop Grumman Cutting Edge Optronics sales office or distributor see the Northrop Grumman Cutting Edge Optronics website for a list of offices 2006 2013 Cutting Edge Optronics a strategic business unit of Northrop Grumman Corporation All rights reserved Northrop Grumman Corporation i Pulsed RB plus 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 authorized 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 service or obtain a copy
14. ctions Temperature Tuning of Laser Diodes The laser diodes are located within the RB P us module and tuned wavelength 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 Y AG operation the xenon arc lamp and 808 nm diode array is also shown Northroo Grumman Corporation 2 Pulsed RB plus User Manual Chapter 1 Introduction Laser Diode Pump Wavelength 8 8 nm Xenon flash tube 1700 A cm Bl Absorption spectrum of Nd YAG 300 K Wavelength um Figure 1 2 Nd YAG Absorption Characteristics The processes used in the manufacture of GaAlAs laser diodes result in a broad distribution of output wavelengths To match the diode output to an absorption peak of the laser medium diodes are selected with outputs near the absorption peak and then temperature tuned for maximum absorption When temperature tuned diode characteristics are such that 0 25 nm of wavelength shift occurs for every loC change in temperature of the diode junction Cooling shortens the wavelength and heating lengthens it In RB Plus the laser diode wavelength is longer than the absorption peak of the laser medium The closed loop chiller pulls or shifts the diode temperature down so that the wavelength matches the absorption peak Pulsed RB Plus Description The RB Plus module was design
15. ed for use as a building block engine in the development or production of medium power rod laser systems or as a drop in replacement for arc lamp pump chambers in industrial lasers It is well suited for medium power applications such as laser marking and can provide high stability and beam quality for more precise micro machining and scientific applications The RB Plus is a completely maintenance free and factory sealed unit that is about 1 2 the size of a standard arc lamp pump chamber It employs the firm s proprietary pumping scheme utilizing a radial array of close coupled diode laser arrays for efficient direct side pumping of the solid state host material This pump geometry results in excellent gain uniformity and lensing performance see Figure 1 3 In order to optically pump the length of the rod arrays are three diode bars long In the Pulsed RB Plus pumphead NG CEO uses a stack of either 2 3 Northrop Grumman Corporation 3 Pulsed RB plus User Manual Chapter 1 Introduction or 4 bars in each array This makes for RB Plus modules with 18 24 or 36 diode bars Diode Array Heat Exchanger eflector D low Tube Nd YAG Rod Diode Array I ELI LLLI T ELI H ES HIT Figure 1 3 Radial Pump Geometry TU Y Nd YAG is the standard host material however other pump wave lengths and host
16. efore exposing them to the Q switched beam View an infrared laser beam with a protected image converter at an oblique angle reflecting from a diffuse surface Do not use phosphorus cards in the Q switched beam Ensure that all electrical connections are made in a safe manner Where possible position equipment so that electrical connections are shielded from accidental touch No smoking eating or drinking should be allowed in laser areas Never leave an operating laser unattended Northrop Grumman Corporation 9 Pulsed RB plus User Manual Chapter 2 Laser Safety INVISIBLE LASER RADIATION AVOID EYE OR SKIN EXPOSURE TO DIRECT 3 OR SCATTERED RADIATION Wavelength Power 790 820nm 10W 1064nm 150W CLASS IV Figure 2 1 Standard Safety Warning Sign Center for Devices and Radiological Health CDRH OEM Product The RB Plus module is considered a component according to the Food and Drug Administration Code of Federal Regulations Title 21 Section 1002 1 b for use in an end system and therefore does not fully comply with all the requirements of the Code of Federal Regulations for laser based systems The RB Plus module is capable of emitting Class IV radiation and extreme care must be exercised in its installation and operation Only persons familiar with the safety precautions and practices in this manual should operate the laser product Northrop Grumman Corporation 10 Pulsed RB plus User Manual Chap
17. efore resuming operation The RB Plus module 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 final test report for optimum temperature and flow rate settings Operating the laser diodes for even a short period of time less than 1 second without coolant 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 set point For this to function properly a flow sensor must be used in the coolant loop When setting up the laser system for the first time NG CEO recommends testing the flow interlock before firing This can be accomplished by setting the drive current to a very low level 1 A then attempting to fire the laser with the chiller off In case interlock does not function correctly be prepared to manually turn off laser By testing the interlock with a minimal current the risk to the laser diodes is minimized WARNING Do not operate the coolant system below 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 a NG CEO field service engineer if you have any questions Air Condensation Temperature The air condensation temperature or dew point is the highest surface temperature that allows
18. esponding hole in one end of the module until it protrudes from the hole in the opposite end Be careful not to chip or scratch the rod while inserting it Place one of the retainer caps onto the endplate and start the three 2 56 screws with lock and flat washers Place the second O ring over the opposite end of the rod Place the remaining cap onto the second endplate and start the three 2 56 screws with lock and flat washers Position the rod equidistant from each end of the pump module using gloved fingers or the soft end of a cotton swab soaked in acetone or methanol Tighten the retainer caps with the 0 50 Allen wrench Inspect both rod ends for cleanliness If necessary clean the ends of the rod with a puff of dry nitrogen or moisture free canned air Look at rod reflections with either an autocollimator or a HeNe to verify there is no rod stress When a HeNe beam is shot down an unstressed rod the reflections from the front near and far surfaces align If the reflections are separated the rod is stressed Leak test according to the following procedure Alternately turn on the chiller and allow coolant to flow for approximately 20 minutes Examine pump module for leaks If pumphead leaked first fix the leak then test again for leaks finally allow module to dry thoroughly before lasing Firing wet diodes will permanently damage them Northrop Grumman Corporation 25 Pulsed RB pus User Manual Chapter 4 Maintena
19. he diode arrays the single most expensive component in NG CEO laser modules Read the following section carefully to avoid damaging arrays CAUTION Do not operate module without cooling Inadequate heat dissipation will seriously damage the laser diodes and will void warranty Northrop Grumman Corporation 17 Pulsed RB plus User Manual Chapter 3 Operation Table 3 1 Cooling System Requirements Chiller and Cooling System Requirements Optishield Plustm distilled water coolant 10 Optishield PlusrM 90 distilled water Coolant circulated at 50 psi Filter connected between chiller and inlet on module Module first in coolant loop Chiller Heat Capacity gt Power Consumption Table 1 1 Flow sensor connected to coolant interlock on drive electronics 1 Clean coolant is important to keeping coolant lines from clogging Untreated tap water is not an acceptable coolant and may cause damage Optishield PlusTM is the recommended coolant It is made from DI water with additives to control the pH By using DI water in the solution scale will not form in the cooling loop It contains biocide to prevent algae growth and corrosion inhibitors to protect yellow metals and aluminum Optishield Plus is available from Opti Temp Inc http www optishield net home php cat 103 3 The filter should be capable of removing particles 5 um or larger The filter should be changed at a minimum of every six m
20. ium Triborate 33 Pulsed RB plus User Manual Acronym MCC Nd YAG Nd YLF NG NIR OEM OSHA PRF PSI SHG TEC TTL USA VAC Northrop Grumman Corporation Appendix C Acronyms Description Meters Concave Neodymium doped Yttrium Aluminum Garnet Neodymium doped Yttrium Lithium Floride Northrop Grumman Near Infrared Original Equipment Manufacturer Occupational Safety and Health Administration Pulse Repetition Frequency Pounds per Square Inch Second Harmonic Generator Thermo Electric Cooler Transistor Transistor Logic United States of America Volts Alternating Current 34 Pulsed RB plus User Manual
21. laim the instrument you must properly transfer it according to local regulations concerning WEEE equipment Contact E NG CEO or 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 AE A RJUREI TI BI AREA OO E m Northrop Grumman Cutting Edge Optronics t 20 Pointe West Blvd St Charles MO 63301 USA iP ei BS Laser Modules RBxx xxx xxx xxxx or RBxx XXxxxx XXx Xxxx RBAxx xxx xxx xxxx or RBAXx 00XX XXX XXXX RDXX XXX XXX XXXX REXX XXX XXX XXXX SRAT PB ATE HR RA R ETELITI Art SARE SACER I RS OBIE B En ta PI PBB PBDE m u wes XEM X 2 2 5 9 AA es um mae EF x ts EN BE nits BEN MM BA HR BESINI 16 MM mr ukwnm o o o 0 RARA RE SU ER BDEEIUR EI RH REP S mE SJ T 11363 2006 REMRRE RYE X RRRARASOM SD CRB PON HRA PAS MBit SJ T 11363 2006 MEHRRER oO oO X e X e O Oo olo lo olo x x x lo o o o x o x o lo x Northrop Grumman Corporation iii Pulsed RB plus User Manual
22. m the laser module Follow instructions contained in this manual for proper installation and safe operation of your laser We recommend the use of protective eyewear at all times selection depends on the energy and wavelength of the laser beam as well as operating conditions Consult ANSI ACGIH or OSHA standards for guidance WARNING Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure WARNING At all 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 United States Code of Federal Regulations 21 CFR 1040 10 d ESD CAUTION The laser diodes in the RB Plus are sensitive to Electro Static Discharge ESD Never handle the RB Plus module without being properly grounded through the use of properly installed and maintained grounding wrist straps or other ESD control devices Subjecting the RB P us to static shock can seriously damage or destroy the diode bars and will void the product warranty 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
23. man Corporation viii Pulsed RB plus User Manual Appendix A Customer Service Questions Appendix B System International Units Appendix C Acronyms Northrop Grumman Corporation 29 30 32 33 Pulsed RB plus User Manual Table of Figures Figure 1 1 Exterior Components and Connections Figure 1 2 Nd YAG Absorption Characteristics Figure 1 3 Radial Pump Geometry Table 1 1 CEO Recommended Chiller Table Table 1 2 Pulsed RB Plus Series Model Specifications1 Table 1 3 RB Plus General Specifications Figure 2 1 Standard Safety Warning Sign Figure 2 2 Radiation Control Drawing Figure 2 3 Warning Labels Figure 3 1 RB Plus with Ring Tongue Terminals Figure 3 2 Reverse Bias Protection Diode Circuit Table 3 1 Cooling System Requirements Table 3 2 Avoid with Chillers Figure 3 1 Constant Dew Point Lines for Ambient Temperature and Relative Humidity 21 Table 3 3 Table of Air Condensation Temperature at Given Ambient Air Temperature Celcius and Relative Humidity percent Figure 4 1 Rod Replacement Drawing Figure 4 2 Nitrogen Leak Test Layout Northrop Grumman Corporation x 22 24 26 Pulsed RB plus User Manual Chapter 1 Introduction This introduction provides the following information Theory of operation Temperature Tuning of Laser Diodes Pulsed RB Plus description Closed Loop Re circulation Chiller Specifications Northrop Grumman Corporation 1 Pulsed RB plus User Manual Chapter 1
24. materials are available The laser medium can be a 2mm or 3mm diameter Nd YAG rod depending on the model selected The laser diode emission wavelengths are selected specifically for pumping the host material of choice Nd YAG has an absorption peak of 808 nm Closed Loop Re circulating Chiller The module coolant loop is designed for an operating pressure of 50 psi Chillers which deliver the required flow rate at lesser pressure do not provide adequate cooling The selected chiller must have a heat capacity of greater than the waste heat for the specific model of RB Plus module Depending on the model of RB Plus the module dimensions rod size output power duty cycle max 20 for pulsed RBA and power consumption varies Therefore NG CEO recommends different model of chiller depending on the number of diode bars in a module and the local electricity which will power the chiller The following table Table 1 1 gives the NG CEO recommendations Northrop Grumman Corporation 4 Pulsed RB plus User Manual Table 1 1 CEO Recommended Chiller Table 60 Hz Electrical Outlets Chapter 1 Introduction Model EOL Waste Polyscience Chiller No Chiller Current Heat Capacity RBA30 2P 70A 504 W 6260T11CE20C 800 W RBA30 3P 70A 756 W 6360T11CE20C 1200 W RBA30 4P 70A 1008 W 6360T11CE20C 1200 W 50 Hz Electrical Outlets Model EOL Waste Polyscience Chiller No Chiller Current Heat Capacity RBA30 2P 70A 504 W 6250T21CE30
25. nce Rod Cleaning CAUTION Ensure gloves or finger cots are worn during this procedure and that it is carried out in a clean environment preferably under a laminar flow hood First blow optical surface with dry nitrogen Then use either hemostats and lens tissue or a tight wrapped cotton tipped applicator lightly wetted with acetone or methanol to wipe the rod face The wipe pattern should be in a circular motion from center towards edge Inspect the rod for cleanliness Repeat if necessary Leak Test Procedure Laser diodes are very sensitive to water damage If you have access to pressurized nitrogen and a pressure gage you can test for leaks without exposing the diodes to water 1 Attach a nitrogen source to one of the coolant ports on the module being tested test article and attach the termination valve to the other coolant port on the test article 2 Close the termination valve Open the inlet valve and adjust the regulator to obtain 80 psi on the pressure gauge 4 Close the inlet valve Wait 5 Return after 30 minutes and record pressure on the gauge Subtract this pressure from starting pressure of 80 psi to get the pressure drop over 30 minutes 6 Pass Fail requirements if the pressure drop is greater than 3 psi FAIL if the pressure drop is less than 3 psi PASS Test Article Water Ports Nitrogen Source Figure 4 2 Nitrogen Leak Test Layout Northrop Grumman Corporation 26 Pulsed RB rius U
26. onths The filter should be changed more frequently if the chiller manufacturer recommends a shorter interval Every six months or whenever the filter is changed the coolant should be drained The chiller should then be cleaned Finally clean coolant should be circulated This ensures the cleanest coolest coolant passes through the diodes the most expensive component of most lasers When not using NG CEO drive electronics verify that flow sensor interrupts current to diodes less than 500 milliseconds after a low flow condition occurs Table 3 2 Avoid with Chillers Avoid with Chillers Untreated De ionized water Iron or aluminum parts in plumbing loop Operation below air condensation temperature 1 NG CEO recommends chiller water have a resistivity of less than 1 0 MQ Deionized water can be used if the resistivity is closely monitored and the coolant loop does not have iron or aluminum parts Northrop Grumman Corporation 18 Pulsed RB plus User Manual Chapter 3 Operation Operating the Chiller WARNING Do not operate module 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 module shut the laser system down immediately Check to see if the coolant is coming from the module If so return the module for repair If not repair the source of the leak and allow the module to dry thoroughly b
27. protection A manual and a final test report should accompany each unit shipped Northrop Grumman Corporation 14 Pulsed RB plus User Manual Chapter 3 Operation Pulsed RB Plus Module Proper storage of the RB P us module involves three steps 1 Remove all coolant from module by blowing dry air through it for 20 minutes 2 Place a shorting connector across the module electrical contacts see example Figure 1 1 3 Store module in a clean dry atmosphere relative humidity less than 30 If necessary place module in a sealed bag with some form of desiccant The RB Plus module connects to diode drive current via the D sub connector on the base of the pumphead module The diodes in the Pulsed RB Plus module require 33 V for the RB 18P or 65 V for the RB 36P Depending on the FET used the electrical system should need approximately 10 more volts The RB Plus module is designed for a nominal peak cur rent of 35 45 A Higher currents are possible with this unit please consult a NG CEO field service engineer for more detail Figure 3 1 RB Plus with Ring Tongue Terminals RB Plus module output is a result of the optical pump power from the pulsed laser diodes If laser diode current optical power is lowered the output from the RB Plus module will also decrease The diode arrays within the RB Plus module are aligned and sealed at the factory There are no user serviceable parts within the Northrop Grumman Corporation 15 P
28. 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 the 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 module by blowing dry air through it for 20 minutes prior to packaging for shipment Place a shorting connector across the electrical connector see example Figure 1 1 Place module in a sealed bag inside shipping container Place some form of desiccant in bag with module WARNING Damage from residual water 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 Northrop Grumman Corporation 28 Pulsed RB pus 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 Northrop Grumman Cutting Edge Optronics 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 manuals and we appreciate all suggestions Date Name Company or Institution
29. rocedures you should understand before operating the module Chapter 3 Module Details provides information about unpacking storing and proper environmental conditions for operation Chapter 5 Maintenance provides information on proper maintenance of your module Chapter 6 Service provides resources to help fix problems with the Pulsed RB Plus module Appendix A Customer Service provides information to expedite any service request before contacting NG CEO Appendix B System International Units identifies commonly used units of measurement found in this manual Appendix C Acronyms provides a list of commonly used abbreviations and their descriptions used throughout this manual Northrop Grumman Corporation vii Pulsed RB plus User Manual Table of Contents Chapter 1 Introduction Theory of Operation Temperature Tuning of Laser Diodes Pulsed RB Plus Description Closed Loop Re circulating Chiller Specifications Chapter 2 Laser Safety Caution amp Warning Statements Precautions for Safe Operation of Class IV Lasers Center for Devices and Radiological Health CDRH OEM Product Safety Device Checklist Chapter 3 Module Details Unpacking your Module Pulsed RB Plus Module Closed Loop Chiller Chapter 4 Maintenance Rod Removal and Replacement Rod Cleaning Leak Test Procedure Chapter 5 Service Contacting Customer Service Return the Instrument for Repair 23 24 26 26 27 28 28 Northrop Grum
30. ser Manual Chapter 5 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 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 To phone for service in other countries contact your sales agent This chapter provides reference to types of customer service needs Contacting customer service Return the instrument for repair Northrop Grumman Corporation 27 Pulsed RB plus User Manual Chapter 5 Service Contacting Customer Service To expedite your service needs please complete the questionnaire in Appendix A Customer Service before you contact NG CEO Customer 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 Return the Instrument for Repair A return merchandise authorization RMA is
31. ter 2 Laser Safety Patent Number Label No Serviceable Parts Label 5 BeO Alert Avoid Exposure Labels Environmentally Friendly Use Peroid Label underneath Figure 2 2 Radiation Control Drawing r MODEL NO SERIAL NO Warranty Void d pe If Removed DATE NO USER SERVICEABLE PARTS WITHIN J This product i covered u r Beryllium Oxide BeO Alert INVISIBLE fio J LASER RADIATION IS 5 898 211 5 985 684 This product contains BeO insulators BeO dust can have EMITTED FROM THIS APERTURE 5 913 108 6 310 900 toxic effects when inhaled Do not disassemble this unit ape TT without appropriate training and precautions AVOID EXPOSURE Figure 2 3 Warning Labels Safety Device Checklist 1 Verify that all labels are securely affixed 2 Verify that the safety interlock system is working properly a Verify that removing the remote interlock prevents laser operation b Verify laser can only be turned on when the key switch is in the ON position Northrop Grumman Corporation 11 Pulsed RB plus User Manual Chapter 2 Laser Safety Verify the key can only be removed when in the OFF position d Verify the emission indicator provides a visible signal then laser emits accessible laser radiation e Verify the emission indicator signal provides advanced warning sufficient to allow action to avoid radiation exposure 3 Locate the module so that operation of laser and or
32. ulsed RB plus User Manual Chapter 3 Operation pumphead module Contact a CEO field service engineer for repairs Before lasing the operator should verify that rod faces are clean If necessary the rod faces can be cleaned by using lens tissue wetted with acetone or methanol to wipe the rod face Reverse Bias Protection Diodes are polarized with respect to electrical flow A forward biased diode readily conducts while a reverse biased diode blocks conduction If sufficient voltage is applied in the reverse direction the diode is permanently damaged Laser diodes are the single most expensive component of a RB Plus module so the customer should be careful to connect diode drive current correctly In order to provide the RB P us modules with some protection against reverse biasing all RB P us modules are equipped with a reverse protection diode This is another diode usually located in the module which forms a circuit across the laser diode arrays in the opposite flow direction Figure 3 2 In the event of the laser diode drive current being reversed the reverse bias protection diode will act like a short circuit allowing the electricity to flow for a brief time with no resistance However the reverse bias protection diode is not able to withstand the high currents that laser diodes require The protection diode will burn out after a brief time and the drive current will be sent through the laser diodes in reverse Laser Diodes
33. ummary The Pulsed RB P us module emits laser radiation that can permanently damage eyes and skin ignite fires and vaporize substances The Laser Safety section Chapter 2 contains information and guidance about these hazards To minimize the risk of injury or expensive repairs carefully follow these instructions Do not open the factory packaging before carefully reading this complete operation and maintenance manual If you have any questions on the product which have not been discussed sufficiently within the 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 section is 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 module We also suggest that you record information about the module such as power settings time and date Northrop Grumman Corporation vi Pulsed RB plus User Manual About this Manual This manual describes the installation operation and service of the Pulsed RB Plus module The manual consists of the following chapters Chapter 1 Introduction provides a theory of operation description of the module and specifications Chapter 2 Laser Safety describes proper safety p
34. ve the beam tube supports from the retainer caps These are just threaded on Remove the retainer caps by removing the six 2 56 button head screws with a 0 50 allen wrench Northrop Grumman Corporation 24 Pulsed RB plus User Manual Chapter 4 Maintenance CAUTION Use extreme caution during the remaining steps of this procedure to insure that the rod faces and or coatings are not damaged Never use a tool that can scratch the rod on the O rings 3 To extract the O rings that hold the rod in position place index fingers on each end of rod and apply pressure first at one end then the other Press back and forth until one of the O rings slides out of its notch Once O ring is dislodged press on same end of rod to dislodge the other O ring Repeat this until O ring moves to the end of the rod where it can be easily removed by hand Remove the rod If necessary loosen an O ring with plastic or fiberglass tool NG CEO recommends Techni Tool 444350122 Be careful not to damage the rod end faces or barrel 5 Unwrap the new rod and inspect the end faces 10 11 12 13 14 15 16 17 Obtain two 70 60 Viton O rings if using a 2mm rod or two 70 9855 Viton O rings if using a 3mm rod These o rings are supplied with the module Place one of the corresponding O rings over one end of the rod Position the O ring approximately 10mm from the end of the rod Insert the opposite end of the rod into the corr
35. 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 at or below the condensation temperature water may collect on that surface A formula for calculating dew point is given below along with a calculated table All temperatures are given in Celsius Northrop Grumman Corporation 19 Pulsed RB plus User Manual Chapter 3 Operation Condensation Temperature d __237 7x XT RH a T RH 17 27xT Lr 17 27 a T RH 2377 T 100 where T is the ambient air temperature in degrees Celsius 0 T 60 RH is the relative humidity in percent 1 RH 100 Ta 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 4 and Table 3 4 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 Northrop Grumman Corporation 20 Pulsed RB plus User Manual Chapter 3 Operation Constant Dew Point Lines for Ambient Temperature and Relative Humidity 12 C 16 C 20 C 24 C 28 C 100 95 90 85 80 75 70 65 60 55 50 45 26 C 40 Relative Humidity 35 22 C 30 18 C 25 14 C 20 10 C 15 10 5 0 6
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