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Model 6800 Tunable Laser Controller

1. ees 15 Figure 13 Avoid direct eye exposure label ese 15 Figure 14 Laser Aperture Label ui eee e 16 Figure 15 Eyewear Required Label ers 16 Figure 16 Rear Panel Labels and Warnings eee 2l Figure 17 TLB 6800 Vortex Plus Laser Head top and rear view 22 Figure 18 Controller Block Diagram eee 33 Figure 19 Laser Head Mechanical Schematic for TLB 6800 Series laser 35 Figure 20 Front Panel Layout a Asa teilen 36 Figure 21 Sample Title Screen sue ie eie ede 40 Figure 22 A Sample Title oia esit esa eia 40 Figure 23 A Sample Laser Head Information 41 Figure 24 A Sample Main 41 Figure 25 A Sample Params Setup Screen esee 41 Figure 26 Model TLB 6800 LN Menu Structure 42 Ligure 27 Rear Pane oou uL IR nr 43 Figure 28 Lit ran Metealf Laser Cavity 76 Figure 29 Drawing of Important Angles and Optimal Pivot Point 77 List of Tables Table 1 Voltage Selector Switch Settings and Fuse Ratings 30 Preface This page is intentionally left blank 1 Safety Precautions 1 1 Classification and Limitations The Vortex Plus Laser System is a Class 3B laser Continuous wave visible and invisible lasers with powers less than 0 5 W an
2. 8 Normal to grating 3 Grating Pivot Point Figure 29 Drawing of Important Angles and Optimal Pivot Point The Model TLB 6800 LN controller provides current voltage and temperature controls to the laser head as well as manual and computer controlled input output interfaces The low noise current supply drives the diode in the laser head controlling the output power The voltage controller drives the piezo in the laser head controlling the lasing wavelength Finally the temperature control regulates the laser cavity temperature providing a stable output wavelength The laser wavelength is also affected by the current through the diode Changing the diode current affects the refractive index of the diode lasers and therefore the laser cavity length The magnitude of the effect is diode dependent but is typically 25 150 MHz mA 78 Principles of Operation This page is intentionally left blank 7 Tips and Techniques 7 1 Introduction This section explains operational details of the Model TLB 6800 LN Controller and its associated laser head Application examples are provided 7 2 Grounding a Laser Head The Model TLB 6800 LN Tunable Laser Controller outputs are isolated from earth chassis ground Isolating the laser head case avoids damaging the device from multiple ground loop potentials AC transients or static discharge Since test equipment probes signal sources and package mounts are often partial
3. This command returns the calibration date of the laser head connected to the controller Response Description Value String laser head calibration date SYSTem LASer SN SYSTem LASer WAVElength Description Syntax Remarks See Also Laser diode wavelength query SYSTem LASer WAVElength This query returns the laser diode wavelength Response Description Value Laser diode wavelength in nanometers nm Computer Interfacing 73 SYSTem LASer CONDition Description Syntax Remarks See Also Laser head condition query SYSTem LASer CONDition This command returns the state of the laser head connected to the controller Response Description Value Integer A 16 bit decimal value representing the state of the laser head connected to the controller Bit Value Description 0 0 Soft limit condition not activated 1 Output current is soft limited 1 Reserved 2 Reserved 3 Reserved 4 0 Rear panel interlock is grounded 1 Rear panel interlock is floating 5 0 Hard limit condition not activated 1 Output current turned OFF due to hard limit 6 Reserved 7 Reserved 8 Reserved 9 0 Controller temperature is normal 1 Output current turned OFF due to high controller temperature 10 0 Output current is turned OFF 1 Output current is turned ON 11 0 Output current ondelay expired 1 Output current ondelay not expired 12 Reserved 13 0 Laser head
4. Press Enter button to see this menu The first menu item is Baud Rate 2 Turn the right knob to select desired baud rate Turn the knob clockwise to increase the value counter clockwise to decrease the value Available baud rates are 1200 2400 4800 9600 19200 38400 and 57600 baud 3 Press the Back button to exit the System Params menu Commands Summary Conventions There are two types of device commands commands that cause the instrument to take a desired action and queries that return a stored value or state of the instrument Queries must end with a question mark while commands may require parameter s to follow SOURce CURRent DIODe 60 00 For example the value 60 00 in the command SOURce CURRent DIODe 60 00 sets the diode current setpoint to 60 00 mA The command query must contain all of the letters shown in upper case lower case letters in the commands are optional and may be used for clarity The commands may be sent to the instrument in either upper or lower case or in any combination For example the following commands are equal SOURce CURRent DIODe 60 00 SOUR CURR DIOD 60 00 source current diode 60 00 Source Current Diode 60 00 COMMAND TERMINATION All commands sent to the controller must be terminated by lt Carriage Return gt lt Line Feed gt characters All responses sent out by the controller are terminated by the same characters 50 Computer Interfacing 5 6 2 Types of C
5. RCL Bin Argument Value Description Bin 0 Restores factory default settings 1to5 Restores settings saved in specified bin Remarks This command restores the instrument to the setup states saved in instrument s non volatile flash memory The parameters that can be restored are Beeper enable state Dial rotary knob lockout state Laser output on delay duration RS 232 baud rate 6000 controller RS 232 syntax compatibility Hardware configuration register setting Current modulation state Diode current setpoint Diode feedforward current coefficient 10 Diode temperature setpoint 11 Piezo voltage setpoint 12 Piezo gain 13 Sweep internal function generator amplitude 14 Sweep internal function generator frequency 15 Sweep internal function generator type ON EDIT See Also RST SAV RST Description Reset command Syntax RST Remarks This command performs a soft reset of the instrument See Also 54 Computer Interfacing SAV Description Save command Syntax SAV Bin Argument Value Description Bin 2105 Saves current settings to specified bin Remarks This command stores the current state of the instrument in non volatile flash memory This state is then recalled using the RCL command See description of RCL command for a list of values saved recalled by the instrument See Also RCL BEEP Description command Syntax BEEP Value Remarks This command controls the instrument
6. please contact New Focus for assistance The descriptions of the returned errors are detailed in the next sections A description of error codes and corresponding error strings generated by the TEC Driver is given below Error Code Error String Description NO ERROR No error exists in the error buffer 116 SYNTAX ERROR This error is generated when the instrument receives a command that cannot be processed Some typical causes a Using ASCII characters outside of a string constant that are not defined by the command language syntax b Missing space between a set command and parameter c Missing character in case of query 126 WRONG NUM OF PARAMS This error is generated when the instrument is unable to process a command due to a mismatch between the number of parameters received and the number of parameters required for the command 201 VALUE OUT OF RANGE This error is generated when the instrument is unable to process a command because the parameter value received is out of range of the acceptable values for the command 86 Appendix A Error Messages 407 TEC TEMP LIMIT The temperature control subsystem output has been turned OFF because the TEC temperature has exceeded safe levels Please allow the laser head to cool down before turning the laser power ON 424 TEC OVER TEMP The temperature control subsystem output has bee
7. s beeper The beeper is used to signal error or See Also warning conditions If no value is specified e The controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 1 or 2 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is 0 1 or 2 e The beeper state is changed per table below e The controller returns Argument Value Description Value 0 Beeper off 1 Beeper on 2 Test beeper 100ms beep BEEP Computer Interfacing 55 BEEP Description Beep query Syntax BEEP Remarks This query returns the enable status of the beeper Response Description beep set 0 Beeper off 1 See Also BEEP LOCKOUT Description Lockout the instrument front panel Syntax LOCKOUT Value Remarks This command can be used to lockout all the buttons and dial knob or just the dial knob on the front panel If no value is specified e The controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 1 or 2 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is 0 1 or 2 e The front panel state is changed per table below e The controller returns OK Argument Value Description Value 0 Front panel buttons and dial knobs enabled 1 Front panel buttons and dial knobs disabled 2 Front panel dial knob disabled
8. 4300 Fax 408 919 6083 Internet sales newfocus com v New Focus A Newport Corporation Brand Visit New Focus Online at Newport Corporation Irvine California Evry and Beaune La Rolande France have all been certified compliant with ISO 9001 by the British Standards Institution Mountain View California is DNV certified Printed in U S A
9. 58 Computer Interfacing OUTPut CURRent MODulate Description Syntax Remarks See Also Laser current modulation enable command OUTPut CURRent MODulate State This command turns the laser current modulation ON or OFF If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 or 1 e controller returns VALUE OUT OF RANGE e No other action is taken If the value is O or 1 e The laser current modulation is turned OFF or ON e The controller returns Argument Value Description State Integer 0 turns the laser current modulation OFF 1 turns the laser current modulation ON OUTPut CURRent MODulate OUTPut CURRent MODulate Description Syntax Remarks See Also Laser current modulation enable state query OUTPut CURRent MODulate This command returns the laser current modulation enable state Response Description Value 0 laser current modulation OFF 1 laser current modulation ON OUTPut CURRent MODulate Computer Interfacing 59 OUTPut STATe Description Syntax Remarks See Also Laser output enable command OUTPut STATe State This command turns the laser ON or OFF When turning the laser ON the light above the front panel s LASER POWER switch will flash for six seconds default before the power is turned ON The flash time can be changed using the ONDELAY
10. See Also None LOCKOUT Description Instrument front panel lockout state query Syntax LOCKOUT Remarks This query returns the instrument s front panel lockout state 56 Computer Interfacing Response Description Value Front panel lockout state See Also LOCKOUT ONDELAY Description Laser turn on delay command Syntax ONDELAY time Remarks This command controls the laser turn on delay This is the amount of time between the moment the laser on command is received and the moment the output is actually energized This setting is also used when a laser is commanded to turn on by pushing the LASER POWER button on front panel of instrument when it is in local control mode If no value is specified e The controller returns PARAMETER SPECIFIED e No other action is taken If the value specified is less than 6000 or greater than 60000 e controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The laser turn on delay is changed to desired value e The controller returns OK Argument Value Description Time Integer Time in milliseconds Valid values are between 6000 and 60000 See Also ONDELAY ONDELAY Description Laser turn on delay query Syntax ONDELAY Remarks This command returns the laser turn on delay time See Also Response Description Value Time in milliseconds ONDELAY Computer Interfacing 57 OUTPut CURRent FFWD Description Syntax Remarks L
11. evidence of shipping damage or you suspect the unit is damaged Damaged equipment may present additional hazards to you Contact New Focus technical support for advice before attempting to plug in and operate damaged equipment CAUTION The user is advised to save the packaging material in case the unit has to be shipped to a different location The packaging material is specially designed to protect the unit during shipping 28 Getting Started 3 3 3 4 3 5 Parts List The following is a list of parts included with the Model TLB 6800 system 1 Model TLB 6800 LN Controller and its accessory items 2 TLB 6700 01 Cable 3 TLB 6800 Vortex Plus laser head The following is a list of parts included with the Model TLB 6800 LN Controller USB Flash drive with Software Drivers and Utilities User s Manual Start Up Guide 2 EC320 AC line cord with a NEMA 5 15P 3 USB Cable for connecting the controller to a computer 4 Spare fuses for 220 VAC 230 VAC and 240 VAC power If you are missing any parts or have questions about the parts you have received please contact New Focus Choosing and Preparing a Suitable Work Surface The Model TLB 6800 LN and the TLB 6800 laser head may be placed on any reasonably firm table or bench during operation Electrical Requirements Before attempting to power up the unit for the first time the following precautions must be followed WARNING To avoid electric shock connec
12. firmware version and date TLB 6800 LN Fwr v1 8 12 09 13 Figure 22 A Sample Title Screen 4 3 7 Laser Head Information Screen The Laser Head Information screen is displayed for a few seconds after the Instrument Firmware Version screen every time the instrument is powered ON This screen is used to display the model and serial number of the laser head connected to the controller A sample screen is shown in Figure 23 System Operation 41 TLB 6813 S N VP 0005 Figure 23 A Sample Laser Head Information Screen 4 3 8 Main Screen The Main screen is displayed after the controller has been powered ON for a few seconds The Current and Voltage Knob Enable button LEDs will be on to indicate that the front panel knobs are enabled to allow the user to change the laser current and piezo voltage setpoints When the unit is turned ON for the first time the main screen will show zero piezo voltage and zero laser current Figure 24 shows a sample of this screen 0 00mA Current Figure 24 A Sample Main Screen 4 3 9 Parameter Setup Screens The Parameters Setup Screens are displayed after the user pushes the Menu button Figure 25 shows the first screen Scrolling through different parameters can be done with the Scroll button The Enter button is used to go into a submenu The Back button is used to return to a parent menu Use the right knob the only one enabled to change the numbers for each parameter Swee
13. integral derivative PID feedback control for each element In this way the laser temperature and the surrounding environment are stabilized to within 10 millikelvin The PZT driver supplies 0 120 Volts DC to a piezoelectric fine tuning element in the laser head By using the PZT system you can tune the wavelength smoothly with sub angstrom precision The DSP based digital board controls all of the other modules runs the digital displays and provides USB interfacing capability It also communicates with the circuit board in the laser head to determine what kind of laser head is connected System Operation 35 4 1 2 Laser Head The laser head embodies a simple ultra stable design which is shown below Everything is mounted on a solid metal base and enclosed in a sealed package You will never need to open the laser head to operate the laser Unauthorized opening of the laser head will void the warranty Current Modulation Input Frequency Controller Modulation Input Tuning Mirror Front Panel Controls Remote Local High Speed Diffraction Beam Current Modulation Input Grating up to 100 MHz ControliIn gt Coating Figure 19 Laser Head Mechanical Schematic for TLB 6800 Series laser In this design a diode laser is used as the gain medium One end of the diode laser has a high reflectivity coating which acts as an end mirror of the external cavity The other end o
14. low and high frequency roll off points are below 10 kHz and about 100 MHz depending on the model The current modulation provided by this input is approximately 20 mA V To prevent damage to the diode laser the voltage swing on this input must be less than 1 Vp p CAUTION This is a direct RF connection to the laser diode Improper use could destroy the diode Do not exceed 1 V peak to peak input Avoid static discharge Since this is a direct connection to the diode laser there is no current limit circuit that prevents too much current from passing through the diode Thus there is a danger of destroying the diode if the maximum current is exceeded Be sure that the current modulation applied to the laser diode will not result in driving the diode above its maximum current See included Acceptance Test Data Sheet The high speed input has a protective shorting cap which should remain in place during normal operation When removing the shorting cap to connect a high frequency driver be sure to wear a ground strap to prevent static discharge Please contact New Focus if you have any questions on how to use the high speed modulation input Make sure to turn off power to the diode before connecting any device to the high speed input 4 4 9 Auxiliary Input The Auxiliary Input is a 16 bit analog to digital converter input to the digital signal processor DSP Analog signals that you connect here can be read out by your computer whe
15. 1 253 Aidu Road 3 Flr 3 Sec Shanghai 200131 China Telephone 86 21 5046 2300 Fax 86 21 5046 2323 Newport Corporation Calling Procedure If there are any defects in material or workmanship or a failure to meet specifications promptly notify Newport s Returns Department by calling 1 800 222 6440 or by visiting our website at www newport com returns within the warranty period to obtain a Return Material Authorization Number RMA Return the product to Newport Corporation freight prepaid clearly marked with the RMA and we will either repair or replace it at our discretion Newport is not responsible for damage occurring in transit and is not obligated to accept products returned without RMA E mail rma service newport com When calling Newport Corporation please provide the customer care representative with the following information Your Contact Information Serial number or original order number Description of problem i e hardware or software To help our Technical Support Representatives diagnose your problem please note the following conditions Is the system used for manufacturing or research and development What was the state of the system right before the problem Have you seen this problem before If so how often Canthe system continue to operate with this problem Or is the system non operational Can you identify anything that was different befo
16. 1 5 Location of Labels and Warnings eese 21 1 5 1 Model TLB 6800 LN Rear 21 1 5 2 TLB 6800 Vortex Plus Laser 22 2 General Information 23 2 1 pepe tene gite nissan 23 21L Key Product Features ar Ds e ee 23 2 1 2 Instrument 24 22 Inp t vic ge PS 24 2 3 SPECUICALIONS qoo ri 25 Preface vii 3 1 3 2 3 3 3 4 3 5 3 6 3 7 4 1 4 2 4 3 4 4 2 3 1 Tunable Diode Laser tien uh tutes 2 3 2 System Specifieations u nisse 2 3 3 General Speeihcatons Getting Started Unpacking and Inspection for Damage eene Paris Choosing and Preparing a Suitable Work Surface Electrical Requirements ana a Power Supplies Seal teen 3 7 1 Connecting the Laser Components 3 7 2 Grounding and Powering the Laser System 3 7 3 Turning Laser OIN aieo uic ern 3 7 4 Turning Laser 3 79 Software Installation ar System Operation Description of Laser System eese Controllers 4 1 2 Laser Head sees eene eene Using the Front Panels Mae 4 2 1 Setting the Laser 4 2 2 Fine Wavelength Control esses 4 2 3 Func
17. 50 TLB 6825 1350 1450 450 TLB 6826 1450 1520 450 TLB 6828 1520 2000 450 TLB 6832 2000 3000 450 TLB 6835 3000 5000 450 Beam Divergence max 5 mrad Maximum Beam Spot Size at 60 cm from 3 mm laser aperture 2 3 2 System Specifications Specifications Value Comment Linewidth lt 200 kHz Integrated over 50 ms lt 1 Over 1 hour Wavelength Stability lt 5 pm Decr de Rous Frequency Modulation 0 1 Hz 100 Hz 100 GHz amplitude Bandwidth Internal 26 General Information Generator Max Frequency Modulation 100 Hz 100 GHz amplitude Bandwidth 1 5 kHz 20 GHz amplitude Max Current Modulation Bandwidth 1 MHz Through controller Directly to diode Max C t Modulati wo ee lt 100 MHz through laser head SMA Bandwidth port Optical Output Free space 2 3 3 General Specifications Environmental Specifications Voltage Requirements 100 120 220 240 50 60Hz Power Requirements MAX POWER 170 Watts Chassis Ground 4 mm banana jack Size HxW xD in mm 3 48 88 4 x 14 0 355 6 x 16 51 419 4 Mainframe Weight Ib kg 17 9 8 1 Operating Temperature 10 C to 40 C lt 90 humidity non condensing Storage Temperature 0 to 50 C lt 90 humidity non condensing Relative Humidity Storage 9096 humidity non condensing Altitude 2000 meters 6550 feet Installation Catego
18. 67 69 36 00 6 1 41 38 8 91 70 37 00 7 1 64 39 9 14 71 38 00 8 1 88 40 9 38 72 39 00 9 2 11 41 9 61 73 40 00 10 2 34 42 9 84 74 41 00 11 2 58 43 10 00 75 42 00 12 2 81 44 11 00 76 43 00 13 3 05 45 12 00 77 44 00 14 3 28 46 13 00 78 45 00 15 3 52 47 14 00 79 46 00 16 3 75 48 15 00 80 47 00 17 3 98 49 16 00 81 48 00 18 4 22 50 17 00 82 49 00 19 4 45 51 18 00 83 50 00 20 4 69 52 19 00 84 51 00 21 4 92 53 20 00 85 52 00 22 5 16 54 21 00 86 53 00 23 5 39 55 22 00 87 54 00 24 5 63 56 23 00 88 55 00 25 5 86 57 24 00 89 56 00 26 6 09 58 25 00 90 57 00 27 6 33 59 26 00 91 58 00 28 6 56 60 27 00 92 59 00 29 6 80 61 28 00 93 60 00 30 7 03 62 29 00 31 7 27 63 30 00 Computer Interfacing 65 See Also SOURce SWEEP AMPlitude SOURce SWEEP AMPlitude Description Internal function generator amplitude query Syntax SOURce SWEEP AMPlitude Remarks This query returns the index to internal function generator amplitude lookup table Response Description Value Index to internal function generator lookup table See Also SOURce SWEEP AMPlitude SOURce SWEEP FREQuency Description Internal function generator frequency set Syntax SOURce SWEEP FREQuency Value Remarks This command sets the internal function generator frequency If no value is specified e controller returns PARAMETER SPECIFIED e No other action is taken If the value specified is greater than 100 Hz e The controller returns VALUE OU
19. E Set function generator type SOURce SWEEP TYPE Query function generator type SOURce VOL Tage PIEZo Set piezoelectric voltage setpoint SOURce VOL Tage PIEZo Query piezoelectric voltage setpoint 52 Computer Interfacing SOURce VOL Tage PZGAIN Set piezoelectric voltage gain SOURce VOLTage PZGAIN Query piezoelectric voltage gain System Commands Syntax Description SYSTem BAUDRATE Set RS 232 baud rate SYSTem BAUDRATE Query RS 232 baud rate SYSTem ENTIME Query laser usage time SYSTem MCONtrol Set controller operation mode SYSTem MCONtrol Query controller operation mode SYSTem SYNTAX Set RS 232 syntax compatibility SYSTem SYNTAX Query RS 232 syntax compatibility SYSTem LASer MODEL Query laser model number SYSTem LASer SN Query laser serial number SYSTem LASer REV Query laser revision number SYSTem LASer CALDATE Query laser calibration date SYSTem LASer WA VElength Query laser wavelength SYSTem LASer CONDition Query laser condition register Computer Interfacing 53 IDN Description Identification string query Syntax IDN Remarks This query will cause the instrument to return an identification string Model Firmware Firmware Controller Name Version Date Serial New Focus XXXX vYYY mm dd yy SNZZZZ RCL Description Recall command Syntax
20. KOUT Set controller front panel state LOCKOUT Query controller front panel state ONDELAY Set laser output ON delay ONDELA Y Query laser output ON delay Output Commands Syntax Description OUTPut CURRent FFWD Set current feedforward state OUTPut CURRent FFWD Query current feedforward state OUTPut CURRent MODulate Set current modulation state OUTPut CURRent MODulate Query current modulation state OUTPut STATe Set laser output state OUTPut STATe Query laser output state OUTPut SWEEP Set function generator state OUTPut SWEEP Query function generator state Sense Commands Syntax Description SENSe CURRent DIODe Sense diode current SENSe TEMPerature TEC Sense TEC diode temperature SENSe VOLTage PIEZo Sense piezoelectric voltage SENSe VOLTage A UXiliary Sense voltage from auxiliary input Source Commands Syntax Description SOURce CURRent DIODe Set diode current setpoint SOURce CURRent DIODe Query diode current setpoint SOURce CURRent FFCOEFF Set feedforward coefficient SOURce CURRent FFCOEFF Query feedforward coefficient SOURce SWEEP AMPlitude Set function generator amplitude SOURce SWEEP AMPlitude Query function generator amplitude SOURce SWEEP FREQuency Set function generator frequency SOURce SWEEP FREQuency Query function generator frequency SOURce SWEEP TYP
21. Laser head recognition 2 1 2 Instrument Features Intuitive Controls and VFD Display Improved data presentation and system control are achieved using a large 2 row by 20 character vacuum florescent display VFD dual ergonomic adjustment knobs and thoughtfully arranged pushbuttons some with integral LEDs The VFD clearly shows system configuration and status with wide viewing angle A myriad of precise yet fast adjustments of key parameters e g output current and mode changes are possible with the dual knob controls menu and dedicated function pushbuttons The unique dual knob arrangement makes it possible to simultaneously and finely adjust two key parameter settings such as output current and piezo voltage in real time 2 2 Input Power The Model TLB 6800 LN can be configured to operate on 100 120 220 or 240 volt AC power See Section 3 6 for information on how to configure the Model TLB 6800 LN for operation on your country specific AC voltage General Information 25 2 3 Specifications 2 3 1 Tunable Diode Laser Maximum Model Number ee Power g 3 mW TLB 6802 350 500 450 TLB 6803 500 600 450 TLB 6804 600 650 450 TLB 6808 650 700 450 TLB 6811 700 760 450 TLB 6813 760 790 450 TLB 6814 790 815 450 TLB 6815 815 835 450 TLB 6817 835 860 450 TLB 6818 860 950 450 TLB 6820 950 1000 450 TLB 6821 1000 1200 450 TLB 6823 1200 1250 450 TLB 6824 1250 1350 4
22. Model TLB 6800 Vortex Plus Laser System mi e KNOB ENABLE CURRENT VOLTAGE KNOB ENABLE a SWEEP a m GENERATOR FRED FWD a 11868004 User s Manual V New Focus A Newport Corporation Brand Preface EU Declaration of Conformity We declare that the accompanying product identified with the mark complies with requirements of the Electromagnetic Compatibility Directive 2004 108 EC and the Low Voltage Directive 2006 95 EC Model Numbers TLB 6800 series Year C mark affixed 2013 Type of Equipment Electrical equipment for measurement control and laboratory use in industrial locations Manufacturer Newport Corporation 1791 Deere Avenue Irvine CA 92606 Standards Applied Compliance was demonstrated to the following standards to the extent applicable BS EN61326 1 2013 Electrical equipment for measurement control and laboratory use requirements for use in a controlled electromagnetic environment This equipment meets the CISPR 11 2009 A1 Class A Group 1 radiated and conducted emission limits BS EN 61010 1 2010 Safety requirements for electrical equipment for measurement control and laboratory use Vouk Cast Mark Carroll Sr Director Instruments Business Newport Corporation 1791 Deere Ave Irvine CA92606 USA Preface iii Warranty New Focus warrants that this product will be free from defects in material and w
23. Punctuation For the purposes of this manual any string enclosed by lt gt is considered to be a command a string or numerical argument The punctuation lt gt is used to symbolize the typographic limits of the command string or argument in question CR Carriage Return The ASCII encoded byte 13 in decimal 0D hex lt LF gt Line Feed The ASCII encoded byte 10 in decimal 0A hex Computer Interfacing 5 2 4 Semicolons Semicolons are used to separate commands within a single transmission concatenation 5 2 5 Command Termination All the commands sent to the driver must be terminated by a lt CR gt lt LF gt sequence 5 2 6 Response Termination the responses from the driver are terminated by lt CR gt lt LF gt sequence 5 3 Controller Operation Mode The Tunable Laser Controller supports two modes of operation LOCAL and REMOTE The controller will be in LOCAL mode by default following a power reset In this mode all the main setpoints and system parameters can be adjusted by turning the control knob on front panel of the controller Output can be turned ON and OFF by pressing the Laser Power button Please refer the System Operation chapter for a detailed description on how to accomplish these tasks When the controller is in REMOTE mode knob control is disabled setpoints and other settings can be adjusted only by issuing appropriate commands from a host PC The controller can be pu
24. Rce CURRent FFCOEFF Description Syntax Remarks See Also Diode laser feedforward current coefficient query SOURce CURRent FFCOEFF This query returns the diode laser feedforward current coefficient Response Description Value Diode laser feedforward current coefficient in milli Amperes Volt mA V SOURce CURRent FFCOEFF SOURce SWEEP AMPlitude Description Syntax Remarks Internal function generator amplitude set SOURce SWEEP AMPlitude Value This command sets the internal function generator amplitude 94 different amplitudes between 0 0V and 60 0V can be set using this command The lookup table below shows the actual internal function generator amplitude for various values provided with this command If no value is specified e The controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is greater than 93 e The controller returns VALUE OUT OF RANGE Computer Interfacing e No other action is taken If the value is in range e The internal function generator amplitude is changed based on the lookup table below e The controller returns Amplitude Amplitude Amplitude Value V Value V Value V 0 0 00 32 7 50 64 31 00 1 0 23 33 7 73 65 32 00 2 0 47 34 7 97 66 33 00 3 0 70 35 8 20 67 34 00 4 0 94 36 8 44 68 35 00 5 1 17 37 8
25. T OF RANGE e No other action is taken If the value is in range e The internal function generator frequency is changed to specified value e The controller returns Argument Value Description Value MAX If the string MAX is specified as value the internal function generator frequency is set to 100 0 Hz Float Desired internal function generator frequency in Hz See Also SOURce SWEEP FREQuency SOURce SWEEP FREQuency Description Internal function generator frequency query Syntax SOURce SWEEP FREQuency Remarks This query returns the internal function generator frequency 66 Computer Interfacing Response Description Value Internal function generator frequency in Hz See Also SOURce SWEEP FREQuency SOURce SWEEP TYPE Description Syntax Remarks See Also Internal function generator type set SOURce SWEEP TYPE State This command sets the internal function generator type to either Sinusoid or Triangle If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 or 1 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is O or 1 e The internal function generator type is changed to Sinusoid or Triangle e The controller returns Argument Value Description State Integer 0 sets the type to Sinusoid 1 sets the type to Triangle SOURce SWEEP
26. TEC SOURce TEMPerature TEC SENSe VOLTage PIEZo Description Syntax Remarks See Also Actual piezoelectric voltage query SENSe VOLTage PIEZo This command returns the magnitude of actual piezo voltage Note that as the piezo voltage increases the lasing frequency increases and the wavelength decreases Response Description Value Actual piezo voltage in Volts SOURce VOLTage PIEZo SOURce VOLTage PIEZo SENSe VOLTage AUXiliary Description Syntax Remarks See Also Actual auxiliary input voltage query SENSe VOL Tage AUXiliary This command returns the magnitude of actual auxiliary input voltage The resolution of this voltage is about 79 uV Response Description Value Actual auxiliary detector input voltage in Volts V None SOURce CURRent DIODe Description Syntax Diode laser current set SOURce CURRent DIODe Value 62 Computer Interfacing Remarks This command sets the diode laser current setpoint If no value is specified e The controller returns PARAMETER SPECIFIED e No other action is taken If the value specified is greater than the diode current rating e controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The diode laser current is changed to specified value e The controller returns Argument Value Description Value MAX If the string MAX is specified as value the diode current set
27. TYPE SOURce SWEEP TYPE Description Syntax Remarks See Also Internal function generator type query SOURce SWEEP TYPE This command returns the internal function generator type Response Description Value 0 Internal function generator type is Sinusoid 1 Internal function generator type is Triangle SOURce SWEEP TYPE Computer Interfacing 67 SOURce VOLTage PIEZo Description Piezoelectric transducer voltage set Syntax SOURce VOLTage PIEZo Value Remarks This command sets the piezoelectric transducer voltage If no value is specified e controller returns PARAMETER SPECIFIED e No other action is taken If the value specified is greater than the laser piezo voltage limit e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The piezo voltage is changed to specified value e The controller returns Argument Value Description Value MAX If the string MAX is specified as value the piezo voltage setpoint is set to laser piezo voltage limit Float Desired piezo voltage in Volts V See Also SOURce VOLTage PIEZo SOURce VOLTage PIEZo Description Piezoelectric transducer voltage setpoint query Syntax SOURce VOLTage PIEZo Remarks This query returns the piezo voltage setpoint Response Description Value Piezo voltage setpoint in Volts V See Also SOURce VOLTage PIEZo SOURce VOLTage PZGAIN Description External f
28. VAC Slo Blo Table 1 Voltage Selector Switch Settings and Fuse Ratings WARNING With the power entry module open the voltage selector switch setting can be changed by removing the drum rotating it to the desired setting and reinstalling the drum Do not attempt to rotate the drum while it is inserted in the power entry module Failure to observe this procedure will result in equipment damage WARNING To avoid electric shock connect the instrument to properly earth grounded receptacles only Failure to observe these precautions can result in fire severe injury or death WARNING To avoid electric shock the appropriate fuses for the AC input power voltage must be installed in the instrument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death Getting Started 31 3 7 Quick Start This section outlines the basic steps needed to start using your External Cavity Tunable Diode Laser including a brief setup and getting started guide It assumes that earlier sections regarding safety and AC input power settings have been read For more detailed information on how to operate the instrument refer to Chapter 4 System Operation WARNING The safety of any system incorporating the equipment is the responsibility of the assembler of the system 3 7 1 Connecting the Laser Components Co
29. aser current feedforward enable command OUTPut CURRent FFWD State This command turns the laser current feedforward ON or OFF When the feedforward is turned ON the controller captures the piezo voltage setpoint at that instance and uses it to determine the actual feedforward current The actual feedforward current is determined using the following equation Iff Vactual Vsetpoint where Iff is the actual feedforward current is the feedforward coefficient Vactual is the actual piezo voltage Vsetpoint is the piezo voltage setpoint captured when this command is issued See Also If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 or 1 e controller returns VALUE OUT OF RANGE e No other action is taken If the value is 0 or 1 e The laser current feedforward feature is turned OFF or ON e The controller returns Argument Value Description State Integer 0 turns the laser feedforward OFF 1 turns the laser feedforward ON OUTPut CURRent FFWD SOURce CURRent FFCOEFF OUTPut CURRent FFWD Description Syntax Remarks See Also Laser current feedforward enable state query OUTPut CURRent FFWD This command returns the laser current feedforward enable state Response Description Value 0 laser feedforward OFF 1 laser feedforward ON OUTPut CURRent FFWD SOURce CURRent FFCOEFF
30. ayers analog and digital The analog layer incorporates low noise design for temperature and current control The digital layer includes all the readouts and circuits to set various operating point parameters This layer acts as an interface between the user or the user s computer and the analog layer User Inputs Local Control Panel LEDs Interface Microprocessor Laser Radiation Out Figure 18 Controller Block Diagram 34 System Operation The analog layer consists of four modules current control temperature control and piezoelectric transducer PZT driver which controls wavelength fine tuning The digital layer includes a Digital Signal Processor DSP and user interface circuitry There is a digital circuit in the laser head that contains information specific to each laser head such as the optimal temperature current settings and the laser head serial number The current driver is a low noise analog DC current supply which provides up to hundreds of mA of current to the laser diode The AC ripple in the output is sub uA RMS If desired the current supply can be modulated at up to 1 MHz through a BNC connector on the rear panel of the controller For proper operation use only with a cable shorter than three meters The temperature driver controls the laser temperature by supplying current to thermoelectric Peltier elements in the laser head A DSP is used to perform proportional
31. b can be activated when navigating the Menu The right knob also allows the user to scroll through the Menu The knob has an acceleration algorithm that causes the rate of change of value to increase as the knob is turned faster Turning slowly allows for fine adjustment at the smallest displayed digit 4 3 2 Enter The Enter key is used to a invoke the Setup screen b accept parameter change or c enter a lower menu level depending on the screen displayed 4 3 3 Display Elements The Model TLB 6800 LN Controller uses a character display to depict information about the current state of the system The display screens shown by the instrument can be classified as follows Title screen Laser Head Information screen Main Setup screen Parameter Setup screen and Error Message screen 40 System Operation 4 3 4 Menu Selection The Menu is accessed by pressing the Menu button and the LED is ON The right knob or Scroll button can be used to scroll through the menu items Use the Enter button to enter a sub menu The right knob is used to change values The Back button returns to the previous screen 4 3 5 Title Screen The Title screen is displayed for a few seconds every time the instrument is powered ON A sample Title screen is shown in Figure 21 New Focus TLB 6800 LN Figure 21 A Sample Title Screen 4 3 6 Instrument Firmware Version Screen Immediately after the Title screen the next screen shows the instrument
32. command If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 or 1 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is 0 or 1 e The laser output is turned OFF or ON e The controller returns Argument Value Description State Integer 0 turns the laser OFF 1 turns the laser ON ONDELAY OUTPut STATe OUTPut STATe Description Syntax Remarks See Also Laser output enable state query OUTPut STATe This command returns the laser output enable state Response Description Value 0 laser output OFF 1 laser output ON ONDELAY OUTPut STATe OUTPut SWEEP Description Syntax Sweep internal function generator enable command OUTPut SWEEP State 60 Computer Interfacing Remarks This command turns the internal function generator ON or OFF Turning this feature ON enables frequency modulation If no value is specified e The controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to 0 or 1 e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is 0 or 1 e The internal function generator is turned OFF or ON e The controller returns OK Argument Value Description State Integer 0 turns the internal function generator OFF 1 turns the internal function gen
33. d greater than 5 mW are classified as 3B and are hazardous for direct ocular and skin exposure The nominal ocular hazard distance NOHD and maximum permissible exposure MPE are NOHD 29 64 m MPE 6 36 J m for 500 nm NOHD 4 35 m MPE 255 J m for 1250 nm NOHD gt 8 04 cm MPE lt 3 96 kJ m 1 2 Precautions for the Safe Operation of Class 3B Lasers WARNING Wear protective eyewear at all times Selection Eyewear fb depends on the wavelength and intensity of the Required radiation the conditions of use and the visual function required Protective eyewear vendors are listed in the Laser Focus World Lasers and Optronics and Photonics Spectra buyer s guides 1 3 Definitions and Symbols The following terms and symbols are used in this documentation and appear on the Model TLB 6800 LN Controller and attached TLB 6800 Vortex Plus Tunable Diode Laser Head where safety related issues occur 12 Safety Precautions 1 3 1 General Warning or Caution A Figure 1 General Warning or Caution Symbol The Exclamation Symbol in the figure above appears on the product and in Warning and Caution tables throughout this document This symbol designates that documentation needs to be consulted to determine the nature of a potential hazard and any actions that have to be taken A Figure2 Electrical Shock Symbol 1 3 2 Electric Shock The Electrical Shock Symbol in the figure above appears throughout this manual T
34. disconnected 1 Laser head connected 14 Reserved 15 Reserved 74 Computer Interfacing This page is intentionally left blank 6 Principles of Operation 6 1 Theory of Design Traditional diode laser technology provides high reliability high electrical efficiency and a wide range of available wavelengths in a compact package By using an external cavity built around a diode laser the Vortex Plus laser enhances the performance of off the shelf diode lasers guaranteeing single mode operation with narrow linewidth and precise wavelength tuning The short term linewidth of the Vortex Plus laser is 200 kHz over a 50 ms time interval compared with typical linewidths for Fabry Perot diode lasers of 10 500 MHz The Vortex Plus laser cavity is based on the Littman Metcalf design which uses a diffraction grating at grazing incidence to provide wavelength selectivity Essential to the performance of tunable external cavity diode lasers ECDLs is a high quality anti reflection AR coating on the front facet of the diode The AR coating turns the diode into purely a gain element A collimating lens directs the output of the diode across a diffraction grating at grazing incidence The end mirror of the laser cavity reflects the first order diffraction off the grating to provide feedback Dispersion provided by the grating allows only one cavity mode to lase resulting in a very narrow linewidth The specular reflection or ze
35. erator ON See Also OUTPut SWEEP OUTPut SWEEP Description Syntax Remarks See Also Sweep internal function generator enable state query OUTPut SWEEP This command returns the internal function generator enable state Response Description Value 0 internal function generator OF F 1 internal function generator ON OUTPut SWEEP SENSe CURRent DIODe Description Syntax Remarks See Also Actual laser diode current query SENSe CURRent DIODe This command returns the magnitude of actual laser diode current The value returned is same as that seen on the front panel of the controller at the time this command is executed Response Description Value Actual laser diode current in milli Amperes mA SOURce CURRent DIODE SOURce CURRent DIODE Computer Interfacing 61 SENSe TEMPerature TEC Description Syntax Remarks See Also Actual laser diode temperature query SENSe TEMPerature TEC This command returns the magnitude of actual laser diode temperature Note that the diode temperature is actively controlled If the room temperature ever gets so high that the coolers have insufficient capacity to reduce the temperature the control loop can become unstable and destroy the cooling elements To prevent damage the laser is automatically shut down if the laser diode temperature exceeds safe limits Response Description Value Actual laser diode temperature in degC oC SOURce TEMPerature
36. es the frame or chassis terminal 1 3 10 Waste Electrical and Electronic Equipment WEEE Figure 10 WEEE Directive Symbol This symbol on the product or on its packaging indicates that this product must not be disposed with regular waste Instead it is the user responsibility to dispose of waste equipment according to the local laws The separate collection and recycling of the waste equipment at the time of disposal will help to conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment For information about where the user can drop off the waste equipment for recycling please contact your local New Focus representative 1 3 11 Control of Hazardous Substances RoHS Compliant Figure 11 RoHS Compliant Symbol This label indicates the products comply with the EU Directive 2002 95 EC that restricts the content of six hazardous chemicals Safety Precautions 15 1 3 12 Laser Radiation Warning Label 1 1112028 3B WARNING LABEL Prints Black and Sunflower Yellow Figure 12 Laser Radiation Warning Label This label indicates the presence of visible and invisible laser radiation as well as the wavelength range and maximum output power 1 3 13 Avoid Direct Eye Exposure Label Figure 13 Avoid direct eye exposure label This label indicates the presence of laser radiation Users are advised to avoid direct eye exposure 16 Safety Precautions 1 3 14 Laser Aper
37. f the diode has an antireflection coating The diode laser is bonded to a temperature sensor and a thermoelectric cooling block which maintains a highly stable diode temperature The laser beam radiating from the diode is collimated by a lens before striking a high quality diffraction grating The diffraction grating is precisely aligned at New Focus and its position is fixed with respect to the diode From the diffraction grating a fraction of the beam is directed to the tuning mirror The position of this mirror determines the operating wavelength of the laser The tuning mirror is mounted on a stiff arm The arm is moved by a piezoelectric transducer PZT for micron scale movements which correspond to sub angstrom wavelength tuning precision An SMA connector is available on the outside of the head enclosure for high speed current modulation The use of this feature is described in Section 4 4 Rear Panel Finally the laser head records how many hours the diode laser has operated A new laser head will typically show 100 150 hours due to factory burn in 36 System Operation 4 2 WARNING Before powering up or operating the Model TLB 6800 LN Controller please read and understand all of Section 1 Using the Front Panel The front panel of the Model TLB 6800 LN Tunable Diode Laser Controller is designed for easy operation It has various distinct areas each with a specific set of related functions and control knobs a
38. fied amplitude values In the rare occasions when the unit overheats especially when the vents are obstructed or the temperature in the room is above specifications the unit will temporarily reduce the input signal amplitude to 1 10 of the maximum value The instrument automatically resumes normal operation when the user responds appropriately to cool the system or reduce the input signal or frequency Decreasing voltage at the Frequency Modulation input corresponds to a decrease in piezo voltage and an increase in laser frequency or a decrease in laser wavelength 4 4 7 Current Modulation Input The Current Modulation input allows the user to modulate the diode current at rates up to 1 MHz This input accepts 10 to 10 V into a DC coupled 1 k Q resistive load and provides 2 mA V modulation for a maximum of 20mA System Operation current modulation peak This input is summed with the front panel setting Note that the front panel current readout does not reflect the modulation input The user has to be careful when the current modulation is enabled not to exceed the laser maximum current limit If the laser current limit is exceeded inadvertently Model TLB 6800 LN limit protection is engaged to protect the laser See Section 4 2 5 for more about the limit protection 4 4 8 High Speed Current Modulation For high speed current modulation up to 100 MHz an SMA connector on the laser head is provided This input is AC coupled the
39. h the external generator applied at the rear panel BNC connector Section 4 4 6 Press the Function Generator button to display the internal generator Amplitude and Frequency System Operation Use the knobs to adjust the generator to the desired parameters The internal generator is used to sweep the piezo voltage with the set amplitude and frequency The signal shape can be triangle waveform or sinewave When the generator is set push the Sweep button to start modulating the piezo voltage Press the Sweep button again to stop the modulation When sweeping the laser frequency is modulated with the set signal shape frequency and amplitude 4 2 4 Feed Forward Model TLB 6800 LN has a feed forward feature which can be enabled with the FEED FFW button Feed forward is generally not necessary when operating the Vortex Plus laser head If feed forward improves the mode hop free tuning range of your particular laser head parameters are included in the final test datasheet When the button LED is lit the function 1s enabled Feed Forward modulates the laser current source with a signal which has the same shape and frequency as the piezo voltage modulation The Feed Forward laser current amplitude is proportional with the piezo voltage modulation amplitude The following equation governs the feed forward current amplitude Ip where Ig is the feed forward current V act is the actual piezo voltage Vse is the voltage set
40. his symbol indicates a hazard arising from dangerous voltage Any mishandling could result in irreparable damage to the equipment and personal injury or death 1 3 3 European Union CE Mark Figure3 Mark The presence of the CE Mark on New Focus branded equipment means that this instrument has been designed tested and certified compliant to all applicable European Union CE regulations and recommendations 1 3 4 Alternating Voltage Symbol rw Figure 4 Alternating Voltage Symbol This international symbol implies an alternating voltage or current Safety Precautions 13 1 3 5 On Figure5 On Symbol The symbol in the figure above represents a power switch position on the Model TLB 6800 LN Controller This symbol represents a Power On condition 1 3 6 Off Figure6 Off Symbol The symbol in the figure above represents a power switch position on the Model TLB 6800 LN Controller This symbol represents a Power Off condition 1 3 7 Fuses pm Figure 7 Fuse Symbol The symbol in the figure above identifies the fuse location on the Model TLB 6800 LN Controller 1 3 8 USB lt gt Figure 8 USB Symbol The symbol in the figure above identifies the USB connector location on the Model TLB 6800 LN Controller 14 Safety Precautions 1 3 9 Frame or Chassis Figure9 Frame or Chassis Terminal Symbol The symbol in the figure above appears on the Model TLB 6800 LN Controller This symbol identifi
41. incorporates a simple stable mechanical design with a minimal number of optical components Low noise analog circuits precisely set critical operating parameters such as diode temperature and current Digital control facilitates remote operation and computer interfacing The TLB 6800 is a modular system The same Model TLB 6800 LN controller will work with any TLB 6800 series laser head The control unit works in both manual and remotely programmed modes and is compatible with USB and RS232 interfaces The Model TLB 6800 LN s front panel multi line display shows important operating parameters including laser diode current and PZT voltage Inputs are available on the Model TLB 6800 LN rear panel and the TLB 6800 Vortex Plus laser head for low speed and high speed diode current modulation respectively 2 1 1 Key Product Features Versatile tuning performance e Fine tuning with the PZT at 0 1 GHz resolution e Smooth linear mode hop free PZT sweeps e Manual and coarse tuning Low noise amp narrow linewidths lt 300 kHz linewidths gt 30 dB side mode suppression ratios Flexible configurations e Wavelengths from 395 nm to 2200 nm General Information Current modulation and FM modulation Protections Laser current limit and fault protection Ability to turn off the laser diode current if fault is detected with the TEC Over temperature protection Plug amp play e USB and RS232 remote interface
42. irm organization or employee that does not need consistent with Customer s right of use hereunder to obtain access to the New Focus Programs and Related Materials These restrictions shall not apply to information 1 generally known to the public or obtainable from public sources 2 readily apparent from the keyboard operations visual display or output reports of the Programs 3 previously in the possession of Customer or subsequently developed or acquired without reliance on the New Focus Programs or 4 approved by New Focus for release without restriction Trademarks The New Focus logo and name are registered trademarks of Newport Corporation in Mexico Israel Singapore European Union Taiwan Hong Kong China Japan Korea Canada Australia and the United States Service Information This section contains information regarding factory service for the source The user should not attempt any maintenance or service of the system or optional equipment beyond the procedures outlined in this manual Any problem that cannot be resolved should be referred to New Focus Preface V Technical Support Contacts North America Europe New Focus Newport MICRO CONTROLE S A 3635 Peterson Way Santa Clara CA 95054 Zone Industrielle Telephone 866 683 6287 45340 Beaune la Rolande FRANCE Telephone 408 919 1500 Telephone 33 02 38 40 51 56 Asia Newport Opto Electronics Technologies pg 2808 2535 6350 3 6 20013
43. is changed per table below e The controller returns Argument Value Description Value 0 Baud rate 1200 bps 1 Baud rate 2400 bps 2 Baud rate 4800 bps 3 Baud rate 9600 bps 4 Baud rate 19200 bps 5 Baud rate 38400 bps 6 Baud rate 57600 bps See Also SYSTem BAUDRATE SYSTem BAUDRATE Description RS 232 baud rate query Syntax SYSTem BAUDRATE Remarks This query returns the RS 232 baud rate Response Description Value 0 Baud rate 1200 bps 1 Baud rate 2400 bps 2 Baud rate 4800 bps 3 Baud rate 9600 bps 4 Baud rate 19200 bps 5 Baud rate 38400 bps 6 Baud rate 57600 bps See Also SYSTem BAUDRATE SYSTem ENTIME Description Laser enable time query Syntax SYSTem ENTIME Remarks This query returns the amount of time laser diode output has been enabled Response Description Value Laser diode enable time in minutes min See Also OUTPut STATe SYSTem MCONtrol Description Controller REMOTE LOCAL operation mode set command Syntax SYSTem MCONtrol Mode 70 Computer Interfacing Remarks This command is used to put the controller in remote local operation mode The controller will be in LOCAL mode by default following a power reset In this mode all the main setpoints and other system parameters can be adjusted by turning the control knobs on front panel of the controller When it is in REMOTE mode knob control is disabled setpoints and other settings can be adjusted only by iss
44. knob control that is positioned below the Current reading on the display screen The New Focus Vortex Plus Tunable Diode Laser is designed to run on a single longitudinal mode The system is set so that the maximum drive current is below the threshold of multimode operation It is not possible for the end user to increase the drive current beyond the factory set limit The Current can be changed only when its Knob Enable button is pressed and the button LED is lit To disable the current set knob press the Knob Enable button again 4 2 2 Fine Wavelength Control The Piezo Voltage is used for fine mHz optical frequency tuning A piezoelectric transducer PZT is used to make adjustments in the tuning arm position The readout is the actual voltage that 15 applied to the PZT The Piezo Voltage control can change the laser frequency over sub GHz range which is easily seen on a wavemeter of sufficient accuracy To change the Piezo voltage setting turn the knob control that is positioned below the PZT Voltage reading on the display screen The Piezo Voltage can be changed only when its Knob Enable button is pressed and the button LED is lit To disable the Piezo Voltage set knob press the Knob Enable button again 4 2 3 Function Generator The Function Generator is used for analog control of the wavelength through the voltage applied to the PZT on the tuning arm The wavelength modulation can be achieved either with the function generator or wit
45. lara CA rights reserved No part of this manual may be reproduced or copied without the prior written approval of New Focus This manual has been provided for information only and product specifications are subject to change without notice Any change will be reflected in future printings New Focus 3635 Peterson Way Santa Clara CA 95054 USA Part No 90059204 Rev A Preface Confidentiality amp Proprietary Rights Reservation of Title The New Focus programs and all materials furnished or produced in connection with them Related Materials contain trade secrets of New Focus and are for use only in the manner expressly permitted New Focus claims and reserves all rights and benefits afforded under law in the Programs provided by New Focus New Focus shall retain full ownership of Intellectual Property Rights in and to all development process align or assembly technologies developed and other derivative work that may be developed by New Focus Customer shall not challenge or cause any third party to challenge the rights of New Focus Preservation of Secrecy and Confidentiality and Restrictions to Access Customer shall protect the New Focus Programs and Related Materials as trade secrets of New Focus and shall devote its best efforts to ensure that all its personnel protect the New Focus Programs as trade secrets of New Focus Customer shall not at any time disclose New Focus s trade secrets to any other person f
46. ly earth grounded it is often necessary to also bond the device case to earth ground It is strongly recommended that a single point ground scheme be established specifically at the binding post This will help minimize noise transients and ground loop hazards Be sure to include any signal generators in your ground circuit CAUTION Only one connection to ground is accepted Failure to do so may result in the unit malfunction and or damage Be careful when connecting other instruments to Model TLB 6800 LN Controller as they may have their ground connected to the Earth Ground For example oscilloscopes have the probe ground connected to Earth Ground If you have additional questions about your earth grounding method contact a New Focus applications engineer 80 Tips and Techniques This page is intentionally left blank 8 Maintenance and Service WARNING Work performed by persons not authorized by Newport Corporation will void the warranty 8 1 Enclosure Cleaning WARNING Before cleaning the enclosure of the Model TLB 6800 LN Tunable Diode Laser Controller the AC power cord must be disconnected from the wall socket The source enclosure should only be cleaned with a mild soapy water solution applied to a damp lint free cloth Do not use an acetone or alcohol solution this will damage the finish of the enclosure 8 2 Technical Support Information and advice about the operation of any New F
47. n turned OFF because the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down and reset the controller by turning it OFF and back ON 501 LDDINTERLOCK The Laser Diode Driver subsystem output has been FLT turned OFF because of remote interlock BNC connector on rear panel assertion 502 LDD CURRENT The Laser Diode Driver subsystem output has been LIMIT turned OFF because of actual current exceeding the current limit set point 524 LDD OVER TEMP The Laser Diode Driver subsystem output has been turned OFF because the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down before turning the output ON again 804 PIEZO OVER The piezo control subsystem setpoint has been changed TEMP to OVbecause the internal heatsink temperature has exceeded safe levels Please allow the unit to cool down before changing the piezo setpoint again 919 LASER This error is generated when user tries to turn the Laser DISCONNECTED Diode Driver subsystem output ON without having a laser head connected to the controller 920 LASER EEPROM This error is generated when user tries to connect a laser ERROR head to the controller using an incompatible cable 921 LD HEAD ACCESS This error is generated when user tries to modify select OFF laser head parameters New Focus Worldwide Headquarters 3635 Peterson Way Santa Clara CA 95054 In U S 877 835 9620 Tel 408 980
48. n you use remote control This is a general purpose input that allows you to collect data from a photodetector during a wavelength scan or for example to create your own Constant Power mode with an external detector The Auxiliary Input will accept signals from 0 to 5 volts and presents a 40 kQ load 5 5 1 5 2 5 2 1 5 2 2 5 2 3 Computer Interfacing Introduction The Model TLB 6800 LN Tunable Laser Controller has USB and RS 232 interfaces to receive commands from and send responses to a host PC The commands supported by the controller can be divided into the following two categories commands that cause it to take a desired action and commands queries that cause it to return a stored value Query commands must end with a question mark It is recommended that when a query command is sent the response to that command from the instrument be read before issuing any other command Set commands on the other hand are used to configure setup the controller for a desired mode of operation These commands take at least one parameter If the controller executed the command successfully it responds with an OK string Otherwise it returns an error message The subsequent sections in this chapter detail the communication protocols supported by the instrument Computer Interface Terminology Listed below are the key abbreviations and concepts used in the command reference section of this manual lt gt Delimiting
49. nnect the Model TLB 6800 LN Controller to the TLB 6800 laser head using the TLB 6700 01 cable Secure the screw locks on the connectors at both ends of the cable WARNING Use only New Focus Model Number TLB 6700 01 cable or New Focus approved alternative to connect the TLB 6800 LN controller to a TLB 6800 Vortex Plus series laser head WARNING Do not disconnect the cable between the Model TLB 6800 LN Controller and the laser head while the Model TLB 6800 LN Controller is powered up WARNING Secure the connector screwlocks at both ends of the cable between the Model TLB 6800 LN and the TLB 6800 laser head 3 7 2 Grounding and Powering the Laser System Verify that the line voltage setting on the rear of the Model TLB 6800 LN Controller matches your MAINS power Verify that the proper fuses are installed See Section 3 6 above for details Getting Started Connect the binding post on the rear of the chassis to earth ground While the protective ground wire within the MAINS power cord when connected to a properly earth grounded receptacle using the supplied power cord will provide adequate safety protection the system noise performance may be improved if this additional connection is made WARNING To avoid electric shock connect the instrument to properly earth grounded receptacles only Failure to observe these precautions can result in fire severe injury or death WARNING To avoid electric shock the a
50. nterface The Model TLB 6800 LN is designed to communicate with standard RS 232 serial interface The connector on the rear panel is a standard female 9 pin Dsub Note that the built in serial port on a PC is a DTE device A straight through cable is used to connect a DTE device PC to a DCE device e g TLB 6800 LN The TXD RXD and RTS CTS pins are not cross connected in this case hence the term straight through cable Simple Straight Through Cable 10 Ground 5 60 2 RX oF TX TX Os O7 40 2 90 5 O1 4 4 3 Chassis GND This 4 mm banana jack is connected to chassis ground It is intended to be used as an additional earth ground connection for the Model TLB 6800 LN s enclosure 4 4 4 AC Power Cord The Model TLB 6800 LN can be operated on either 50 or 60 Hz mains power The instrument can be configured for operation at the following nominal AC line voltages 100 120 220 230 or 240 VAC See section 3 6 for information on properly configuring the Model TLB 6800 LN for the available mains power The line cord supplied with each unit should be plugged only into a properly grounded outlet to prevent electrical shock in the event of an internal short circuit to the metal cabinet The detachable line cord should be connected to the IEC320 connector on the power entry module System Operation 45 4 4 5 Fuses The correct fuses must be installed into the fuse holder that is part of the AC ower entry m
51. ntroller please read and understand all of Section 1 WARNING Do not attempt to operate this equipment if there is evidence of shipping damage or you suspect the unit is damaged Damaged equipment may present additional hazards to you Contact New Focus technical support for advice before attempting to plug in and operate damaged equipment WARNING To avoid electric shock connect the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaution can result in severe injury WARNING Before cleaning the enclosure of the Model TLB 6800 LN Controller or the enclosure of any attached Tunable Diode Laser head the AC power cord must be disconnected from the wall socket Safety Precautions 19 CAUTION There are no user serviceable parts inside the Model TLB 6800 LN and the associated Tunable Diode Laser head Work performed by persons not authorized by New Focus will void the warranty For instructions on obtaining warranty repair or service please refer to Section 8 WARNING If this equipment is used in a manner not specified in this manual the protection provided by this equipment may be impaired WARNING While the Model TLB 6800 LN Controller s front panel key switch turns power OFF to the internal electronics it should not be depended upon to fully disconnect the unit from MAINS power Disconnect the power cord to fully isolate the Model TLB 6800 LN from MAINS power Do n
52. ocus product is available from our technical support engineers For quickest response ask for New Focus Technical Support and know the model and serial number for your product Hours 8 00 5 00 PST Monday through Friday excluding holidays Toll Free 1 866 NUFOCUS 1 866 683 6287 from the USA amp Canada only Phone 408 980 4300 Support is also available by fax and email Fax 408 919 6083 Email techsupport newfocus com We typically respond to faxes and email within one business day 82 Maintenance and Service 8 3 8 4 Obtaining Service The Vortex Plus Tunable Laser System has been designed to provide years of trouble free operation with virtually no maintenance except for ensuring that the unit is not damaged contaminated or used in an unsafe manner The Model TLB 6800 LN Controller and TLB 6800 Vortex Plus laser head contain no user serviceable parts To obtain information regarding factory service contact New Focus or your New Focus representative Please have the following information available 1 Instrument model number on the rear panel 2 Instrument serial number on rear panel or bottom of enclosure 3 Description of the problem If the instrument is to be returned to New Focus you will be given a Return Number which you should reference in your shipping documents Please fill out a copy of the service form located on the following page and have the information ready when contacting Newpor
53. odule Please check the fuse label on the rear panel before installing new fuses see Figure 27 WARNING To avoid electric shock the appropriate fuses for the AC input power voltage must be installed in the instrument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death 4 4 6 Frequency Modulation Input The Frequency Modulation input is for external analog control of the wavelength through the voltage applied to the PZT on the tuning arm It is useful for making fine frequency adjustments and for FM spectroscopy Sweeping the Frequency Modulation input from 2 25 V to 42 25 V corresponds to changing the laser frequency by an amount on the order of 30 GHz to 30 GHz for certain models The actual modulation you will observe depends on the wavelength range of the laser head see the Acceptance Test Data Sheet of your particular laser and on the rate and amplitude of the incoming signal for example full 30 GHz modulation is only available at rates up to 200 Hz The Frequency Modulation input will accept triangle waveforms from DC to 2 kHz with an amplitude of 0 3 V and DC to 700 Hz with an amplitude of 3V The instrument will protect itself from going over these signal values to prevent overheating of the piezo actuator or internal circuitry The protection gradually decreases the input amplitude if the user inadvertently goes over the speci
54. ommands There are five general types of commands Standard Commands Output Commands Sense Commands Source Command and System Commands Standard Commands allow you to get information about the controller and to set controller specific parameters such as beeper front panel etc System Commands allow users to query laser and any system level information Output Commands are used to turn ON OFF various outputs that affect laser performance They can also be used to query the state of the output Source Commands are used to set query laser operating parameters Queries return the value of various controller set points Sense Commands return the value of various laser operating conditions Sense Commands read actual voltages currents and temperatures the value returned is the same as that seen on the controller front panel at the time the command is executed The next section has an index of all the possible computer control commands Then the pages that follow the index of commands give detailed information about each command including a description of the command and examples of how the command is used Computer Interfacing 51 Index of Commands Standard Commands Syntax Description IDN Identification string query RCL Recall controller settings RST Reset the controller SAV Save controller settings BEEP Set controller beeper status BEEP Query controller beeper status LOC
55. on on the available AC power This is accomplished by setting the voltage selector switch on the AC power entry module AND verifying that the correct fuses are installed into the power entry module Failure to do this can result in degraded instrument performance damage to the Model TLB 6800 LN and or injury to the operator The voltage selector switch and the fuses are accessed by opening the power entry module using a flat bladed screwdriver Note that the AC line cord must be removed from the power entry module prior to attempting to open it With the power entry module open the voltage selector switch setting can be changed by removing the drum rotating it to the desired setting and reinstalling the drum Do not attempt to rotate the drum while it is inserted in the power entry module You risk bending the power contacts and rendering the unit inoperable After correctly setting the voltage selection switch the fuses installed in the power entry module should be checked for the correct value and if they are not correct they should be changed Table 1 below identifies the correct voltage selector switch setting and fuse ratings for several common AC power levels 30 Getting Started Input Power Voltage Switch Setting Fuses 100 VAC 50 Hz 100 2A 250VAC Slo Blo 120 VAC 60 Hz 120 2A 250VAC Slo Blo 220 VAC 50 Hz 230 1A 250VAC Slo Blo 230 VAC 50 Hz 230 1A 250VAC Slo Blo 240 VAC 60 Hz 240 1A 250
56. ontroller Operation Mode 54 USB Communication ccce 5 5 RS 232 Communication 5 6 Commands Summary 5 6 1 Conventions 5 6 2 Types of 5 56 8 Index of Commands Jueces eres 6 Principles of Operation 6 1 Theory of Design ise rete 7 Tips and Techniques 7 1 Introd HOD osos eet bito toto einen 7 2 Grounding a Laser Head eoo eet 8 Maintenance and Service 8 1 Enclosure Cleaning ete toten oe sante ee oe ntes 8 2 Teehinical 8 3 Obtaining ene edques 84 Warranty RT 8 5 Seryice 9 Appendix A Error Messages 95 90 2 Error nee Preface ix List of Figures Figure 1 General Warning or Caution Symbol sess 12 Figure 2 Electrical Shock Symbol san ass a 12 odo wee ob uet a 12 Figure 4 Alternating Voltage Symbol eese 12 Figured On Symbolic 13 Ligure 6 Off cu unt oec Ehe oet Sata dapi 13 Figure 7 Ruse Symbola aus eA ia en dein 13 Figure 8 USB Symbol ae 13 Figure 9 Frame or Chassis Terminal Symbol sess 14 Figure 10 WEEE Directive Symbol 2 22 a 14 Figure 11 RoHS Compliant Symbol see 14 Figure 12 Laser Radiation Warning Label
57. orkmanship and will comply with the New Focus published specifications at the time of sale for a period of one year from date of shipment If found to be defective during the warranty period the product will either be repaired or replaced at New Focus option To exercise this warranty write or call your local Newport office or representative or contact Newport headquarters in Irvine California You will be given prompt assistance and return instructions Send the product freight prepaid to the indicated service facility Repairs will be made and the instrument returned freight prepaid Repaired products are warranted for the remainder of the original warranty period or 90 days whichever occurs first Limitation of Warranty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress improper installation misuse abuse accident or negligence in use storage transportation or handling This warranty also does not apply to fuses batteries or damage from battery leakage THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE NEW FOCUS SHALL NOT BE LIABLE FOR ANY INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS First printing 2014 2014 by New Focus Santa C
58. ose specified herein may result in hazardous radiation exposure WARNING The Model TLB 6800 LN controller is intended for use ONLY with New Focus specified laser head modules DO NOT ATTEMPT TO USE THE CONTROLLER WITH UNAPPROVED OTHER DEVICES INCLUDING NEW FOCUS VELOCITY TLB 6700 SERIES LASER HEADS WARNING The TLB 6800 series laser heads are intended for use ONLY with a New Focus Model TLB 6800 LN controller DO NOT ATTEMPT TO USE THE LASER HEAD WITH UNAPPROVED OTHER DEVICES INCLUDING THE NEW FOCUS VELOCITY TLB 6700 LN AND XP CONTROLLERS Safety Precautions 21 1 5 Location of Labels and Warnings 1 5 1 Model TLB 6800 LN Rear Panel CE Label DERE RoHS Label d MODULATION TRIGGER CONTROL INPUT e LASER Model Fuse Serial Label WEEE Max Symbol Power Figure 16 Rear Panel Labels and Warnings 22 Safety Precautions 1 5 2 TLB 6800 Vortex Plus Laser Head Figure 17 TLB 6800 Vortex Plus Laser Head top and rear view 2 General Information 2 1 Introduction The New Focus TLB 6800 Vortex Plus Tunable External Cavity Diode Laser is a stable narrow linewidth source of tunable light The Model TLB 6800 series laser head is compatible with the Model TLB 6800 LN Controller The laser can be operated manually from the front panel or remotely using computer control The TLB 6800 series laser
59. ot position the TLB 6800 LN Controller so that it is difficult to disconnect the power cord WARNING The rear panel LASER CONTROL connector may have voltages as high as 140 VDC between various connector pins Do not power up the Model TLB 6800 LN without a laser head connected WARNING Do not attempt to power up the controller if the cable between the controller and the laser head is damaged WARNING Use only New Focus Model Number TLB 6700 01 cable or New Focus approved alternative to connect the Model TLB 6800 LN Controller to a TLB 6800 Vortex Plus series laser head 20 Safety Precautions WARNING Do not disconnect the cable between the Model TLB 6800 LN Controller and the attached laser head while the Model TLB 6800 LN Controller is powered up WARNING Secure the connector screw locks at both ends of the cable between the Model TLB 6800 LN and the attached laser head The Model TLB 6800 LN Controller is intended for use in an industrial laboratory environment Use of this product in other environments such as residential may result in electromagnetic compatibility difficulties due to conducted as well as radiated disturbances The Model TLB 6800 Laser System is designed to operate in a controlled electromagnetic environment i e where R F transmitters such as mobile telephones may not be used in close proximity WARNING Use of controls or adjustments or performance procedures other than th
60. p Params Feedforward Paramsv Figure 25 A Sample Params Setup Screen The following figure shows the menu structure and navigation 42 System Operation Menu Sweep Params Type Feedforward Params Coefficient Modulation Params Piezo Gain Curr Mod System Params Baud Rate Aud Beep 6000 Syntax Service Mode System Status LD Temp Aux Volt Laser Head Info Model S N Rev Date ON Time Tot Time Figure 26 Model TLB 6800 LN Menu Structure System Operation 43 4 4 Rear Panel The Model TLB 6800 LN rear panel has various dedicated input and output connectors as well as important labeling See below Frequency Function Function Modulation Generator Generator Input Output Trigger Interlock Output Input CE Label RS 232 Interface LATIO j zm D N Y 4 2 Auxiliary ee DA 4d IL e AT SN T 50 60 Hz USB ERSO ECT POWER BEFORE REPLACING FUSE Wine CA _MADE IN USA j UAAX PONR TA Interface Current Modulation Input Laser Control I O Serial WEEE Symbol Chassis Ground Label Figure 27 Rear Panel 4 4 1 USB Interface The Model TLB 6800 LN is designed to communicate with standard USB Host interfaces The connector on the rear panel is a standard USB B Full Size Device System Operation 4 4 2 RS 232 Serial I
61. patibility mode ON SYSTem SYNTAX SYSTem SYNTAX Description Syntax Remarks See Also 6000 Laser Controller RS 232 syntax compatibility mode query SYSTem SYNTAX This command returns the 6000 Laser Controller RS 232 syntax compatibility mode Response Description Value 0 turns 6000 controller RS 232 syntax compatibility mode OFF turns 6000 controller RS 232 syntax compatibility mode ON SYSTem SYNTAX SYSTem LASer MODEL Description Syntax Remarks See Also Laser head model number query SYSTem LASer MODEL This command returns the model number of the laser head connected to the controller Response Description Value String laser head model number SYSTem LASer SN SYSTem LASer SN Description Syntax Remarks See Also Laser head serial number query SYSTem LASer SN This command returns the serial number of the laser head connected to the controller Response Description Value String laser head serial number SYSTem LASer MODEL 72 Computer Interfacing SYSTem LASer REV Description Syntax Remarks See Also Laser head revision number query SYSTem LASer REV This command returns the revision number of the laser head connected to the controller Response Description Value String laser head revision number SYSTem LASer SN SYSTem LASer CALDATE Description Syntax Remarks See Also Laser head calibration date query SYSTem LASer CALDATE
62. point is set to the diode s current rating Float Desired diode laser current in milli Amperes mA See Also SOURce CURRent DIODe SOURce CURRent DIODe Description Syntax Remarks See Also Diode laser current setpoint query SOURce CURRent DIODE This query returns the diode laser current setpoint Response Description Value Diode laser current setpoint in milli Amperes mA SOURce CURRent DIODe SOURce CURRent FFCOEFF Description Syntax Remarks Diode laser feedforward current coefficient set SOURce CURRent FFCOEFF Value This command sets the diode laser feedforward current coefficient If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is less than 5 0 mA V or greater than 5 0 mA V Computer Interfacing 63 See Also e The controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The laser feedforward current coefficient is changed to specified value e The controller returns Argument Value Description Value MIN If the string MIN is specified as value the laser feedforward current coefficient is set to 5 0 mA V MAX If the string MAX is specified as value the laser feedforward current coefficient is set to 5 0 mA V Float Desired laser feedforward current coefficient in milli Amperes Volt mA V SOURce CURRent FFCOEFF SOU
63. point reference captured by the controller when feed forward feature is enabled and 1 feed forward coefficient The units for are mA V and default value is 0 8 can be any value between 5 0 and 5 0 The total contribution of feed forward current may not exceed 20mA Feed Forward works with either the internal generator when the Sweep function is enabled Section 4 2 3 or with the external generator which can be attached at the Frequency Modulation input Section 4 4 6 The user has to be careful when Feed Forward is enabled not to exceed the laser maximum current limit If the laser current limit is exceeded inadvertently Model TLB 6800 LN limit protection is engaged to protect the laser See Section 4 2 5 for more about the limit protection 4 2 5 Laser Current Limit Protection One of the parameters stored in the laser head TLB 68XX internal memory is the Laser Current Maximum Limit This limit can only be exceeded if the laser current is over modulated The laser current maximum modulation amplitude is 20 mA whether the modulation comes from the Feed Forward circuit see Section 4 2 4 or from the Current Modulation BNC input at the rear panel see Section 4 4 7 Normal operation occurs only when the sum of the laser current set point and the modulation amplitude do not exceed the maximum limit To protect the System Operation 39 laser from being inadvertently driven over the limit Model TLB 6800 LN employs t
64. ppropriate fuses for the AC input power voltage must be installed in the instrument Only qualified service personnel should replace fuses Failure to observe these precautions can result in fire severe injury or death 3 7 3 Turning the Laser ON Turn lockout keyswitch to T position to power on the unit Turn the knob control to set the desired Current setpoint Press Laser Power button The LED in the button will flash for 6 seconds and then stay ON The actual laser diode current will quickly ramp up to the specified setpoint 3 7 4 Turning the Laser OFF To minimize the risk of power surges damaging the laser diode and to preserve the lifetime of the diode push the Laser Power button to turn OFF the laser when it is not in use the LED on the button will turn off and before shutting down the system Turn the front panel keyswitch to position to shut down the entire system 3 7 5 Software Installation For instructions on how to install the software provided with the controller please refer to TLB 6800 ReadMe pdf file You need to have a PDF reader installed to view its contents 4 System Operation 4 1 Description of Laser System 4 1 1 Controller The job of the controller is to provide a stable low noise power source for the diode laser set the temperature in the laser head and provide readouts of all relevant laser parameters Conceptually the circuitry inside the controller is built in two l
65. re this problem occurred Preface Table of Contents i EU Declaration of ii iii Technical Support Contacts lesen Table f Eonlene so iioc il con vi Listof Figures M a 1 Eist of Tables 1 1 Safety Precautions 11 1 1 Classification and Limitations eene 11 1 2 Precautions for the Safe Operation of Class Lasers H 1 3 Definitions and Symbols 11 1 3 1 General Warning or Caution seen 12 13 2 Electrice Shock ou donet 12 1 3 3 European Union CE Mark eie ge 12 1 3 4 Alternating Voltage Symbol sess 12 LION seen 13 1 3 6 Em 13 vau puc er 13 cose poit bai 13 1 3 9 Frame ot Chassis 14 1 3 10 Waste Electrical and Electronic Equipment WEEE 14 1 3 11 Control of Hazardous Substances 14 1 3 12 Laser Radiation Warning 15 1 3 13 Avoid Direct Eye Exposure Label 15 1 3 14 Laser Aperture Label eie edes 16 1 3 15 Eyewear Required Label eene 16 1 4 Warnings and Caution enge ae 16 1 4 1 General Re 17 1 4 2 General Cautlofis aie dtt ett es 17 1 4 3 Summary of Warnings and 18
66. requency modulation gain set Syntax SOURce VOLTage PZGAIN Value Remarks This command sets the gain applied to external frequency modulation input If no value is specified 68 Computer Interfacing e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is less than 0 0 or greater than 25 5 e controller returns VALUE OUT OF RANGE e No other action is taken If the value is in range e The frequency modulation gain is changed to specified value e The controller returns OK Argument Value Description Value Float Desired frequency modulation gain See Also SOURce VOLTage PZGAIN SOURce VOLTage PZGAIN Description Syntax Remarks See Also External frequency modulation gain query SOURce VOLTage PIEZo This query returns the external frequency modulation gain Response Description Value External frequency modulation gain SOURce VOLTage PZGAIN SYSTem BAUDRATE Description Syntax Remarks RS 232 baud rate set SYSTem BAUDRATE Value This command controls the instrument s RS 232 baud rate If no value is specified e controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is less than or greater than 6 e controller returns VALUE OUT OF RANGE e No other action is taken If the value is between 0 and 6 Computer Interfacing 69 e The RS 232 baud rate
67. ro order diffraction off the grating serves as the output beam of the laser 76 Principles of Operation Coating Pivot Point Laser Diode Chip Collimating Lens AR Coating Retroreflector Wavelength Tuning Laser Output Diffraction Grating Figure 28 Littman Metcalf Laser Cavity The number of waves in the cavity is maintained by having the tuning mirror rotate around a specific pivot point The pivot point creates a relationship between the cavity length and the laser wavelength The laser wavelength is set by the standard law for diffraction of light off a grating A sinOj sinO where A is the spacing between grooves in the grating while and 0 refer to the incident and diffracted angles of the laser beam measured from a line normal to the surface of the grating The length D of the cavity can be broken into two parts and See Figure 28 If we call the distance from the pivot point to the place where the beam strikes the grating L we can see from the figure that l Lsin and l LsinOg Therefore the total cavity length is L sin9 sinOg Dividing the total cavity length by the wavelength shows that the total number of waves in the cavity is which is a constant By designing a mechanical system where this condition is maintained over the tuning range of the laser the cavity can tune mode hop free over extended frequency ranges Principles of Operation 77
68. ry Pollution Degree 2 Use Location Indoor use only The Model TLB 6800 LN Controller and TLB 6800 laser head were designed to operate in a controlled electromagnetic environment While they will not be damaged by operation in an industrial electromagnetic environment as defined in EN61326 1 2013 such operation may not yield optimal performance For this reason New Focus does not recommend operation of these devices in close proximity to mobile telephones hand held radio transmitters and similar devices 3 Getting Started 3 1 Unpacking and Handling It is recommended that the Model TLB 6800 LN Controller and the TLB 6800 laser head be unpacked in a lab environment or work site Unpack the system carefully small parts are included with the instrument Inspect the box carefully for loose parts You are advised to save the packaging material in case you need to ship your equipment in the future 3 2 Inspection for Damage The Model TLB 6800 LN Controller and associated laser head are carefully packaged at the factory to minimize the possibility of damage during shipping Inspect the box for external signs of damage or mishandling Inspect the contents for damage If there is visible damage to the instrument upon receipt inform the shipping company and New Focus immediately Carefully open the box and save the shipping material for later use WARNING Do not attempt to operate this equipment if there is
69. s shown in Figure 20 below v Tunable Laser Controller Figure 20 Front Panel Layout Make sure the controller is plugged into a wall socket and your laser head cable is plugged into the back of the controller Point the laser head in a safe direction and check that the AC power input connector is configured for the correct line voltage Turn on the AC power using the front panel keyswitch The laser head serial numbers optimum diode parameter settings and other pertinent operating information stored in an EEPROM in the laser head are uploaded to the controller The alphanumeric display will show the model number and the controller software revision number After a few seconds the display will become active About 30 minutes of warm up time is recommended for best performance System Operation 37 The keyswitch is the ON OFF for the whole unit including the laser head The Laser Power button controls the laser output When you push the Laser Power button it flashes for a 6 second safety delay default value and then lights up to indicate that current is flowing through the diode laser in the laser head unit This allows you to set up all the desired operating parameters with the AC Power on but while the laser is not generating light 4 2 1 Setting the Laser Current Press the Current Voltage button to display the laser current and the piezo voltage setpoints To set the desired Current level turn the
70. t Corporation Return the completed service form with the instrument Warranty New Focus a division of Newport Corp guarantees its lasers to be free of defects for one year from the date of shipment or for 3000 hours of operation whichever comes first This is in lieu of all other guarantees expressed or implied and does not cover incidental or consequential loss The laser head warranty is void if the inner laser cavity box is opened 83 8 5 Service Form New Focus U S A Office 408 980 4300 FAX 408 919 6083 Name Return Authorization Please obtain RA prior to return of item Company Please obtain RA prior to return of item Address Date Country Phone Number P O Number FAX Number Item s Being Returned Model Serial Description Reason for return of goods please list any specific problems 84 Maintenance and Service This page is intentionally left blank 9 Appendix Error Messages 9 1 9 2 Error Description Introduction The errors generated by the laser controller can be retrieved by pushing the Menu button on front panel of the controller scrolling to Errors menu and pressing the Enter button These errors can be retrieved by issuing ERRSTR command through USB or RS 232 communication interface also Some of these errors can be cleared by switching the laser controller OFF and then back ON If the errors persist
71. t into REMOTE mode by issuing the command SYSTem MCONtrol REM It can be put back in LOCAL mode by issuing SYSTem MCONtrol LOC command 5 4 USB Communication The instrument is designed to communicate with a host PC via a standard USB interface Before connecting the instrument to the USB interface the user should install the application included in the software CD that accompanies the Tunable Laser Controller The application automatically installs the right USB drivers Communication can be done through this interface by using the application or by developing software in the user s preferred programming language The software CD contains communication drivers and example programs in the following programming languages LabVIEW and 5 5 RS 232 Communication The instrument is designed to communicate with a host PC via RS 232 communication interface The pin out of the 9 pin D sub connector located on the rear panel of the controller is designed to interface directly with a computer using a straight through cable To communicate with the instrument the host PC s RS 232 settings must be configured as follows 8 data bits no parity checking 1 stop bit and no Computer Interfacing 49 5 6 5 6 1 hardware handshake The controller can support baud rates between 1200 and 57600 baud the default baud rate is 19200 baud Setting the Baud Rate for RS 232 Press the Menu button and scroll down to System Params menu
72. t the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaution can result in severe injury WARNING The TLB 6800 LN controller is supplied with a detachable power cord Do not replace this cord with an inadequately rated cord e Have a qualified electrician verify the wall socket that will be used is properly polarized and properly grounded Getting Started 29 Provide adequate distance between the Models TLB 6800 LN and the laser head and adjacent walls for ventilation purposes Do not let any other equipment blow hot air towards the devices Verify the correct rated fuses are installed according to the fuse marking on the rear panel The unit has temperature sensors If the unit overheats it will generate an error message and stop operation to protect itself until the user takes the necessary steps to lower the temperature 3 6 Power Supplies WARNING To avoid electric shock the Model TLB 6800 LN must be configured for operation on your specific AC line voltage PRIOR TO CONNECTING THE POWER CORD TO THE AC MAINS See the instructions above for information AC power is supplied through the rear panel power entry module connector that provides in line transient protection and RF filtering The power entry module also contains the instrument s fuses and the voltage selection switch Prior to plugging in the AC line cord the user MUST configure the Model TLB 6800 LN for operati
73. tion Generator eeeeeeeeerere 4 2 4 Feed Forward esee 4 2 5 Laser Current Limit Meni Section Ines 4 3 1 Control Knobs 4 3 2 4 3 3 Display EBlemen e sa Hr 4 3 4 Menu 5 amp 43 5 ino 4 3 6 Instrument Firmware Version Screen 4 3 7 Laser Head Information Screen 43 8 Main SCreenss ose 4 3 9 Parameter Setup Rear Panel i NIS 4 4 1 USB Interface eene enero 442 RS 232 Serial Interface sees 4 4 3 Chassis GND seen nnne 444 Power Cord viii Preface 4 4 6 Frequency Modulation Input 4 4 7 Current Modulation Input 4 4 8 High Speed Current Modulation 4 4 9 Auxiliary 5 Computer Interfacing 5 1 introduction ie eee 5 2 Computer Interface Terminology 5 2 1 lt gt Delimiting Punctuation 5 2 2 CR Carriage Return nsi 5 20 ECL EOS Lm Peed ed woe oat 32 4 5 2 5 Command 5 2 6 Response Termination 5 3 C
74. ture Label Figure 14 Laser Aperture Label This label indicates the location of the laser aperture 1 3 15 Eyewear Required Label a Eyewear O Required Figure 15 Eyewear Required Label This symbol indicates that the product users need to use appropriate protective eyewear at all times 1 4 Warnings and Cautions The following are definitions of the Warnings Cautions and Notes that are used throughout this manual to call your attention to important information regarding your safety the safety and preservation of your equipment or an important tip WARNING Situation has the potential to cause bodily harm or death Safety Precautions 17 CAUTION Situation has the potential to cause damage to property or equipment NOTE Additional information the user or operator should consider 1 4 1 General Warnings Observe these general warnings when operating or servicing this equipment Heed all warnings on the unit and in the operating instructions Do not use this equipment in or near water This equipment is grounded through the grounding conductor of the power cord Route power cords and other cables so that they are not likely to be damaged Disconnect power before cleaning the equipment Do not use liquid or aerosol cleaners use only a damp lint free cloth Lockout all electrical power sources before servicing the equipment To avoid fire hazard use only the specified fuse s with the correct
75. type number voltage and current ratings as referenced in the appropriate locations in the service instructions or on the equipment Only qualified service personnel should replace fuses To avoid explosion do not operate this equipment in an explosive atmosphere Qualified service personnel should perform safety checks after any service 1 4 2 General Cautions Observe these cautions when operating this equipment If this equipment is used in a manner not specified in this manual the protection provided by this equipment may be impaired To prevent damage to equipment when replacing fuses locate and correct the problem that caused the fuse to blow before re applying power Do not block ventilation openings Do not position this product in such a manner that would make it difficult to disconnect the power cord Safety Precautions Position the equipment so that access to the mains disconnect On Off switch is readily available Use only the specified replacement parts Follow precautions for static sensitive devices when handling this equipment This product should only be powered as described in the manual There are no user serviceable parts inside the Model TLB 6800 LN Controller Adhere to good laser safety practices when using this equipment 1 4 3 Summary of Warnings and Cautions The following general warning and cautions are applicable to this instrument WARNING Before operating the Model TLB 6800 LN Co
76. uing appropriate commands from a host PC If no value is specified e The controller returns NO PARAMETER SPECIFIED e No other action is taken If the value specified is not equal to LOC or REM e controller returns VALUE OUT OF RANGE e No other action is taken If the value is LOC or REM e The controller operation mode is changed to LOCAL or REMOTE mode e The controller returns OK Argument Value Description Mode String REM sets the controller to REMOTE mode LOC sets the controller to LOCAL mode See Also SYSTem MCONtrol SYSTem MCONtrol Description Syntax Remarks See Also Controller REMOTE LOCAL operation mode query SYSTem MCONtrol This command returns the controller operation mode Response Description Value REM controller is in REMOTE mode LOC controller is in LOCAL mode SYSTem MCONtrol SYSTem SYNTAX Description Syntax Remarks 6000 Laser Controller RS 232 syntax compatibility mode set SYSTem SYNTAX Mode This command is used to turn the 6000 Laser Controller RS 232 syntax compatibility mode ON or OFF When the compatibility mode is turned ON the Model TLB 6800 LN Computer Interfacing 71 See Also controller s response to commands supported by 6000 controller will mimic 6000 controller s response Argument Value Description Mode Integer 0 turns 6000 controller RS 232 syntax compatibility mode OFF turns 6000 controller RS 232 syntax com
77. wo over the limit conditions SOFT LIMIT and HARD LIMIT If the current limit is exceeded by more than 2 mA the system enters the SOFT LIMIT condition in which the FEED FWD LED will start blinking to make the user aware that the laser 1s overdriven When the user decreases the modulation amplitude or the laser current level below the limit the LED will stop blinking and the system returns to normal operation If the current limit is exceeded by more than 7 mA the system enters the HARD LIMIT condition in which the unit will shut the laser immediately and display an error message To return to normal operation the user needs to reduce the modulation amplitude or the laser current level below the limit and then turn the laser power ON from the LASER POWER button 4 3 Menu Section In addition to showing status parameters on the display the Menu section of the front panel enables users to view change more parameters 4 3 1 Control Knobs The Model TLB 6800 LN has two control knobs Each knob changes values of the parameter shown in the area of the display directly above the knob The control knob on the right side of the front panel is used to set the value of Current Function generator frequency and all other parameters in the Menu There are Knob Enable buttons next to each knob The knob is active when the LED in the Knob Enable button is on To disable the knob press the Knob Enable button and the LED will turn off Only the right kno

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