WaveMaster™
Contents
1. IEEE 488 2 The tables above apply with the exception of SRE amp Commands SRE which are defined below The GPIB serial F polling facility is used to set bit 0 in the SRQ register for When Using every message sent from WaveMaster This is necessary GPIB to allow the GPIB controlling program to handle unsolic ited data that is produced when running in logging mode refer to GPIB Software Protocol on page 38 Table 12 IEEE 488 2 Commands When Using GPIB MNEMONIC MEANING COMMENTS Set Service RequestEnable Any parameter set has no effect since register this mode is mandated Service Request Enablereg Bit 4 is set to 1 if there is an unser ister query viced message waiting See Table 9 on page 32 33 WaveMaster User Manual User Almost all commands exist in both the set data form and Commands return data query form The latter always need to have as the last character Where appropriate the values returned will use the same format as setting of parame ters Parameter Setting Commands Table 13 Parameter Setting Command MNEMONIC MEANING PARAMETERS Change autocalibration state ON or OFF Set data capture mode C for CW A for CW Average P for Pulse Set measurement units A for wavelength in air in nm V for vacuum wavelength in nm F for frequency in GHz W for wave number in cm PRD Set period between regular output Integer for seconds of data and initiate process O turns process off 5 seconds2. Return Material Autho rization number Attach a tag to the product that includes the name and address of the owner the person to contact the serial number and the RMA number you received from Coherent Customer Service Wrap the product with polyethylene sheeting or equivalent material If the original packing material and carton are not available obtain a corrugated cardboard shipping carton with inside dimensions that are at least 6 in 15 cm taller wider and deeper than the product The shipping carton must be constructed of card board with a minimum of 375 lb 170 kg test strength Cushion the instrument in the shipping carton with packing material or urethane foam on all sides between the carton and the product Allow 3 in 7 5 cm on all sides top and bottom Seat the shipping carton with shipping tape or an industrial stapler Ship the product to Coherent Inc 7470 SW Bridgeport Rd Portland OR 97224 Attn RMA add the RMA number you received from Coherent Customer Service 51 WaveMaster User Manual 52 Appendix A Installing a GPIB Interface APPENDIX A INSTALLING A GPIB INTERFACE MODULE The GPIB module catalog number 1058562 allows the user to upgrade WaveMaster from model 33 2650 to 33 2627 It is easily installed and requires little special ized skill Tools required 2 0 mm Allen hex key ESD protection strap The GPIB module contains sensitive microelectronic circuits
3. a result of thermal changes Once the temperature of the instrument has stabilized longer periods are used to ensure that the WaveMaster spends as much of its time as possible making input signal measurements and not calibrating itself The user is unaware of the effect of external ambient temperature changes through the adaptive autocalibration scheme employed Why turn autocal off It is normally recommended that the WaveMaster be left in autocal ibration mode When using CW or pulsed lasers with a high repeti tion rate a continuous reading can be displayed In pulse mode with single shot operation it is possible that the signal will arrive while an internal calibration is taking place and thus an input measurement cannot be made By turning the autocalibration off before the event such situations can be avoided The autocalibration should be turned on after the measurement to ensure continuing measurement accu racy Note that turning autocalibration back on will cause Wave Master to recalibrate immediately so that if the user wishes to force a recalibration it is only necessary to turn Autocal off and then on again Why can t I get RS 232 Check that the receiving serial port has been set to the correct param communications eters as given in RS 232 Hardware Connection on page 25 A null modem is not required all connections being wired directly The RTS CTS lines are used but can be unconnected at the host end provided they
4. can be used to control the instrument It is necessary to power off to effect a change of controlling interface Features offered by the computer interface include 1 WaveMaster can be treated as a wavelength trans ducer 2 The same command set for both RS 232 and GPIB hardware interfaces 3 Compliance with IEEE 488 2 standard 4 Commands that are insensitive to case in this document UPPER CASE is used throughout 5 Commands that take parameters ignore unneces sary white space characters 6 Multiple commands can be sent on a single line separated by the semicolon character 7 Only one of the RS 232 or GPIB interfaces can be active at any time and either is automatically selected after the data is received from the host controller If the type of interface is changed the instrument must be powered off and back on 24 Operation Unless stated otherwise values given are in decimal unless the number is of the form Oxdd which is used for bit patterns more naturally expressed in hexadecimal The input and output of such values do not use the 0x characters Single bit values in byte type values that is status bytes are active high 1 unless otherwise indi cated RS 232 Table 3 shows how the 9 pin socket on the rear panel is Hardware wired Connection Table 3 9 Pin Socket Pinout AAA 25 WaveMaster User Manual Table 4 lists the serial line communication parameters Table 4 Serial
5. is far too high for measurement The switch mode mains power supply provided as part of the WaveMaster system is the only power supply that is to be used to provide external power The power supply requires assembly by sliding the mains plug adapter appropriate to the country of use onto the power supply body It is recommended that the adapter be 17 WaveMaster User Manual Maintenance changed as infrequently as possible but this interchange ability can be convenient if WaveMaster is to be oper ated in different countries The output lead from the power supply is connected to the socket on the rear panel of the instrument The display and window should be cleaned using only a cloth moistened with water Do not use chemicals or cleaners The WaveMaster should not be sprayed with anything WaveMaster contains no user serviceable parts Under no circumstances should the instrument case be opened WaveMaster contains delicate optical components that have been carefully aligned WaveMaster employs an internal calibration system based on precisely known wavelengths of spectral lines There is no need to return WaveMaster to the factory for periodic recalibration 18 Description Rep lacement Table 2 lists available replacement items Parts Table 2 Replacement Parts ITEM PART NUMBER WaveMaster Sensor 1058563 GPIB Card Upgrade 1058562 WaveMaster Manual 1079154 available on our website www Coherent com The n
6. level are being carried out the message Autoranging may appear on the display screen This occurs as the instru ment responds to significant input level changes by auto matically making internal adjustments The intensity meter indicates the absolute input signal level and takes account of any internal ranging carried out Internal ranging occurs in the CW and CW Av mode but not in Pulse mode If the display screen currently shows the message Satu rated and hence the intensity meter indicating in the red region at the right hand of the scale less input signal is required Adjust the front panel attenuator in a counter clockwise direction in order to decrease input signal If this does not reduce the signal level far enough then the alignment of the sensor with the laser may be altered to sample less of the signal or additional attenuation can be used with the sensor such as a filter or diffuser refer to Sensor on page 15 22 Operation When adjusted for the correct intensity level the wave length reading should be displayed on the screen It will be in the currently selected unit chosen from nm in air at standard laboratory temperature and pressure STP nm vacuum calculated by conversion from STP wave number cm or frequency GHz A valid measure ment can be achieved over a wide range of front panel attenuator settings and is not influenced by the input signal level The preferred signa
7. not operate the meter if its panels are removed or any of the interior circuitry is exposed Do not operate the meter in wet or damp conditions or in an explosive atmosphere Operate the meter only within the specified voltage range Do not apply a voltage outside the specified range of the input connections Do not operate the meter if there are suspected fail ures Refer damaged units to qualified Coherent service personnel Safety Declaration of Conformity ijira Ariwa AB Declaration of Conformity We Coherent Inc 2470 SW Bridgeport Road Portland Oregon LISA FRIDA decane that the WaveMaster meets the following directas and stardands Directives EMC BOySR6 EEC 92 31 EEC 99 68 EEC Lira Voltage TRQSPEEC Standards Genenc Emission ENSO081 1 Genenc immunity ENSOCAS 1 Machinery Safety EMG0204 1 E y Fair N fi lg A i Y aad 1077 Date EACAN si ro ng Marape Instruments r F e RE PAS Ali Date RT General Manager LMC Crier ine Page of 1 WaveMaster User Manual Description DESCRIPTION WaveMaster M provides a simple and quick method of determining the wavelength of lasers in the 380 to 1095 nm range to an accuracy of 0 005 nm or better It can measure CW pulsed and single shot lasers There are four available units of measurement Wavelength in air nm at standard temperature and pressure Wavelength in vacuum nm Wave number in vacuum cm Frequency GH
8. on the display What is autoranging Why does it display multi line Why does the displayed measurement flip between values Why does the signal level change rapidly Why does movement of the fiber cause changes to the wavelength measurement RESPONSE The LCD has contrast that is sensitive to temperature If the instru ment has been taken from a cold environment the LCD contrast will need adjusting This is done by using the front panel controls to restore the displayed information Autoranging is displayed when the instrument is making internal adjustments to its integration period for the detector array This ensures that a very wide dynamic range can be offered to the user with the minimal need for intervention Autoranging does not take place during pulse operation Pulse mode can be used with CW signals to make initial alignment easier Due to the method of operation WaveMaster has to work on the assumption that the input is monochromatic Laser diodes are partic ularly prone during periods of unstable operation to generate distinct spectral content of very small amplitude very close to the principal wavelength Other laser sources may contain much more diversely separated wavelengths In either case the WaveMaster algorithms cannot resolve the spectral content This is due to the behavior exhibited by the input source Laser diodes are particularly prone to this and WaveMaster has the accu racy to report such e
9. option repair or replace any product or component found to be defective during the warranty period This warranty applies only to the orig inal purchaser and is not transferable Coherent Inc the Company offers original purchasers the Customer purchasing laser power and energy meters and sensors products Products an extended lifetime warranty program which includes all parts and labor In order to qualify for this warranty a Customer must return the Product to the Company for recalibration and recertification traceable to NIST and MIL STD 45662A within one year from the date of purchase and annually thereafter The Company will recertify the Product provide software upgrades and perform any needed repairs for a fixed service fee as established by the Company from time to time and in effect at the time of service Ifthe Product fails and is returned to the Company within one year following the date of recalibration service the Company will at its option repair or replace the Product or any component found to be defective This warranty applies only to the original purchaser and is not transfer able 47 WaveMaster User Manual Warranty Limitations If the Product is not returned for recalibration or service prior to the one year anniversary the lifetime warranty program expires The lifetime warranty program may be reinstated at Coherent s option after completion of a fee based product evalu
10. with any of its interlocks defeated is always at the operator s risk 111 WaveMaster User Manual iv Table of Contents TABLE OF CONTENTS O E ix U S Export Control Laws Compliance errei ix Publication Updates A E A A AE ix Symbols Used in This Document na ae x A een PN 1 Declaration of Conformity a es 3 DESCRIDUON ss sn 5 Lac kr Aa A aria O e a 6 System DESEHptIon en ae iss e e En 8 E usa E RES innen 8 Front Panel Controls iii ee 8 Front Panel Display martial 11 Rear Pad 14 OC PIS ee 15 Powersupply dis 17 MA od 18 Replacement Pat la oda 19 Operation tennis 21 Making a Measurement dd erst 21 A A E n 24 Introduction cdta id atlas 24 RS 232 Hardware Connection euuesssnssssesnsessnessnnnsoonennensnnnsnnnnnnnnsnnnnn 25 GPIB Hardware Parameters nun radic 26 Commands ONES ee edel 28 IEEE 488 2 Commands When Using RS 232 neenn 29 Event Status Enable and Event Status Register 30 Status Byte A A nn Ente 31 WaveMaster User Manual Service Request Enable Register 31 A ee ee lee 32 Self Test Codes nass O 32 IEEE 488 2 Commands When Using GPIB en 33 User COMAS ad 34 Parameter Setting Commands a 34 Query Comnmands senken 35 NALS Formal es sie 36 Error Formats art ee 36 GPIB Software ProjocoL asus 38 Getting the Best from WaveMastet ccccccccessseceseceseeeeeeeeseeceaecneeeeeeenseees 39 Frequently Aske
11. 2 VDC In Only the power supply shipped with the WaveMaster should be connected to the instrument The power supply comes with mains plugs for most coun tries and can be connected to voltages from 90 to 240 VAC GPIB Upgrade Panel This panel contains the IEEE 488 connector If the instrument has GPIB capa bility there is also an address switch otherwise it is blank RS 232 Connector This is a female 9 pin D connector The pin out for this connector is given in Table 3 on page 25 An input sensor supplied as part of the WaveMaster system provides a versatile and convenient way of collecting laser energy for measurement The sensor may be attached to a standard mounting post and a post post holder and base are also supplied There is a switch on the top of the sensor which offers two input collection options In one position the sensor has a wide field of view but reduced sensitivity The other position provides maximum sensitivity but reduced collection angle The sensor is provided with a captive fiber optic cable two meters in length for connection to the WaveMaster 15 WaveMaster User Manual Figure 3 Exploded and Sectioned View of Laser Input Sensor Front End The front end of the sensor is designed to provide as much flexibility in the method of use as possible The nosepiece 1 contains an uncoated thin glass plate at 45 degrees to the sensor axis This allows the sensor to be inserted at 90 degrees to a beam to c
12. 8onpage31 31 Self Test query See Table 11 on page 33 output in hexadecimal OOO M O Wait to continue Wait to continue command No Note 30 Operation Event Status Each bit set in the enable register will result in setting of Enable and Event same status register bit when the event occurs All input Status Register and output is in hexadecimal Table 7 Event Status Enable and Event Status Register MEANING 1 3 6 and 7 Currently undefined Reading event status register resets it to 0 Status Byte Table 8 Status Byte 0 3 and 5 7 Currently undefined Reading status byte resets it to 0 All output is in hexa decimal 31 WaveMaster User Manual Service Request Enable Register Table 9 Service Request Enable Register BIT MEANING Event occurred in Event Status register 0 3 and 6 7 Currently undefined IDN Fields Table 10 IDN Fields FIELD CONTENTS Unique serial number W Firmware revision A V The four fields are separated by the character The character represents a single decimal digit The format of field 4 reflects that there are two distinct programmable units within WaveMaster 32 Operation Self Test Codes Table 11 Self Test Codes MEANING Power on self check status 1 passed GPIB interface fitted 1 module installed Number of autocalibration failures since last interrogated 0xF is maximum count Reset to O after reading
13. E How does it work The WaveMaster is a high diffraction order spectrometer Wave length is determined by careful measurement of the separation between the diffracted orders Much of the accuracy and simplicity inuse is achieved through software implemented algorithms running in the digital signal processor and conventional microprocessor in the instrument Why won t it power up If WaveMaster is connected to the mains power unit and the yellow pulse received light does not light then the rear panel connector may not be making a good connection and should be re inserted It is also possible that the power supply has failed This should give 12V DC with the centre of the connector positive Why does itpowerupbut This does happen very occasionally Restarting the instrument a powers off very shortly second time should clear the problem afterwards A persistent failure to start indicates a serious internal problem The message that appears briefly on the display provides some informa tion about the cause of the failure The most likely cause is that the internal optics have become misaligned probably through undue shock or the spectral calibration source has failed Contact Coherent with as much detail about the display message as possible refer to Obtaining Service on page 49 41 WaveMaster User Manual Table 17 Frequently Asked Questions Continued QUESTION Why does it appear to be working but there is nothing
14. Line Communication Parameters PARAMETER SETTING Y GPIB Hardware Parameters WaveMaster uses the hardware flow control facilities CTS and RTS The parameters listed in Table 4 are designed to be compatible with other Coherent Instru ments When connected to an IBM PC compatible serial port a straight through connection is needed not null modem WaveMaster serial communication has been success fully driven using the standard Windows 9x operating system utility HyperTerminal If a three wire interface is more convenient it is essential that pins 7 and 8 CTS RTS signals are wired together at the WaveMaster end of the connecting cable this is most readily achieved inside the connector This optional interface is compliant with the IEEE 488 standard The GPIB address can be set between O and 31 in binary using the switches adjacent to the GPIB connector on the rear panel In line with standard advice 26 Operation it is recommended that the address not be set to 0 Ifthe address is set to 31 it will be interpreted as 30 again in accordance with the IEEE488 1 standard Only a primary address is used The GPIB controller should be set to use the following parameters refer to Table 5 to control WaveMaster on the chosen primary address which should match the back panel switch value Table 5 GPIB Controller Parameters The address is set on the DIP switch next to the connector It is set in binary with swit
15. User Manual WaveMaster Laser Wavelength Meter O COHERENT User Manual WaveMaster Laser Wavelength Meter O COHERENT 7470 SW Bridgeport Rd Portland OR 97224 WaveMaster User Manual This document is copyrighted with all rights reserved Under the copyright laws this document may not be copied in whole or in part or reproduced in any other media without the express written permission of Coherent Inc Permitted copies must carry the same proprietary and copyright notices as were affixed to the original This exception does not allow copies to be made for others whether or not sold but all the material purchased may be sold given or loaned to another person Under the law copying includes translation into another language Coherent and the Coherent Logo are registered trademarks of Coherent Inc WaveMaster is a trademark of Coherent Inc Every effort has been made to ensure that the data given in this document is accurate The information figures tables specifications and schematics contained herein are subject to change without notice Coherent makes no warranty or representation either expressed or implied with respect to this document In no event will Coherent be liable for any direct indirect special incidental or consequential damages resulting from any defects in its documentation Technical Support In the U S Should you experience difficulties with your product or need technical information ple
16. Whenever handling the module and throughout installation take ESD precautions 1 Ensure the WaveMaster is powered off and the mains power supply is disconnected 2 Remove the four screws on the rear panel with the Allen key and place them in a safe place The blank panel will now be free 3 Carefully detach the ribbon cable from its retaining clip Completely remove the blank panel 4 Using ESD precautions insert the connector on the ribbon cable into the mating socket on the GPIB 53 WaveMaster User Manual module The connector is polarized so it only fits in one direction The module should be positioned so that the GPIB connector is at the top 5 Using the four retaining screws fasten the new back plate with its GPIB module to the rear panel Carefully place the ribbon cable back inside the case 6 Set the desired GPIB address on the 6 position switch on the module This is set in binary with switch 1 being the Isb and switch 6 unused The WaveMaster is now ready for operation as a GPIB controlled instrument 54 Appendix B Specifications APPENDIX B SPECIFICATIONS Table 19 lists specifications for the WaveMaster Table 19 Specifications PARAMETER DESCRIPTION Wavelength Coverage Accuracy Resolution Display Update Max Safe Input Signal Min Pulse Repetition Rate Max Pulse Repetition Rate Max Signal Bandwidth Size h x w x d Weight External Communications Storage Co
17. an be the message Saturated Multi Line or No Signal The latter only applies to single use of the VAL command and indicates that the last valid measurement has already been output In the case of periodic output no new data is produced if there has been no signal input in the current period Error Formats A single message type ERRS followed by a two digit code is provided for reporting detected command errors In the case of multiple commands on a line this is then followed by a slash and the command number in the sequence that generated the reported error Only the first command in error is reported 36 Operation Table 16 Error Codes CODE ERROR POSSIBLE CAUSE Invalid command or query Incorrect spelling of command missing Invalid parameter Error in non numeric text parameter or addi tional information detected Invalid value Numeric parameter out of range Too many multiple Limit is 32 commands on a single line Parameter missing Command that takes parameter has not had one supplied 4 Privilege violation Privileged command sent but not in privileged mode or password in error E 7 Data unavailable Internal error The exact circumstances gener ating the error should be reported to Coherent 37 WaveMaster User Manual GPIB Software Protocol The operation is identical to using the serial mode but due to the more complex type of interface imposed by the standards the GPIB receivi
18. are wired together at the WaveMaster connector 43 WaveMaster User Manual 44 Calibration and Warranty CALIBRATION AND WARRANTY Calibration This section includes information on the following topics Calibration this page Coherent calibration facilities and capabilities page 46 Limited warranty page 47 Extended lifetime warranty page 47 Warranty limitations page 48 Obtaining service page 49 Product shipping instructions page 51 Coherent laser power and energy meters are precision instruments capable of delivering very accurate measurements as well as providing many years of useful service To maintain this high level of performance it is important to have your measurement system serviced and recalibrated once a year 45 WaveMaster User Manual Coherent Calibration Facilities and Capabilities As the largest laser manufacturer in the world Coherent has been able to build state of the art calibration facili ties containing the widest possible range of laser types and technologies This enables us to perform instrument and sensor calibration under virtually any combination of wavelength power and operating characteristics Sensors are calibrated against NIST traceable working standard sensors which are in turn calibrated against NIST calibrated golden standard sensors These working and golden standards are maintained with the utmost care recalibrated annually and verified even more re
19. ase visit our website www Coherent com You can obtain additional support by either telephoning our Technical Support Hotline at 1 800 343 4912 or e mailing our Support Team at support instruments Coherent com Telephone coverage is available Monday through Friday except U S holidays If you call outside our office hours your call will be taken by our answering system and will be returned when the office reopens If there are technical difficulties with your product that cannot be resolved by support mechanisms outlined above please e mail or telephone Coherent Technical Support with a description of the problem and the corrective steps attempted When communicating with our Technical Support Department via the web or telephone the model and serial number of the product will be required by the Support Engineer responding to your request Outside the U S If you are located outside the U S visit our website for technical assistance or telephone our local Service Representative Representative phone numbers and addresses can be found on the Coherent website www Coherent com Coherent provides web and telephone technical assistance as a service to its customers and assumes no liability thereby for any injury or damage that may occur contemporaneous with such services These support services do not under any circumstances affect the terms of any warranty agreement between Coherent and the buyer Operating a Coherent product
20. ately five seconds the instrument will enter its autocal ibration mode Once the Autocal message has cleared from the display area WaveMaster is ready to take measurements No further warm up time is required System settings at the last power off will have been remembered by the instrument and will now be in effect Even though autocalibration may have been disabled WaveMaster will always perform an initial calibration as part of its power up sequence Also it will always power up ready for local control It is now necessary to adjust the level of input signal to the instrument This is achieved using the messages and reading on the display in conjunction with the indication 21 WaveMaster User Manual on the intensity meter The aim is to have the intensity indication well into the right hand side of the green sector of the scale If the display screen is currently blank and the intensity meter indicating in the red region at the left hand of the scale more input signal is required Adjust the front panel attenuator in a clockwise direction to see if this achieves the necessary increase in signal If not then adjust the alignment of the sensor with the laser beam The acceptance angle of the sensor is quite small and some care must be taken in the alignment to ensure that the laser radiation is focused onto the sensor fiber optic cable refer to Sensor on page 15 Note that while adjustments to the input signal
21. ation and repair and subsequent recalibration and recertification service The foregoing warranties shall not apply and Coherent reserves the right to refuse warranty service should malfunction or failure result from a Damage caused by improper installation handling or use Laser damage including sensor elements damaged beyond repair Failure to follow recommended maintenance procedures e Unauthorized product modification or repair Operation outside the environmental specifications of the product Coherent assumes no liability for Customer supplied material returned with Products for warranty service or recalibration THIS WARRANTY IS EXCLUSIVE IN LIEU OF ALL OTHER WARRANTIES WHETHER WRITTEN ORAL OR IMPLIED COHERENT SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT SHALL 48 Obtaining Service Calibration and Warranty THE COMPANY BE LIABLE FOR ANY INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH ITS PRODUCTS In order to obtain service under this warranty Customer must notify the Company of the defect before the expira tion of the warranty period and make suitable arrange ments for the performance of service The Company shall in its sole discretion determine whether to perform warranty service at the Customer s facility at the Company s facility or at an authorized repair station If Customer is directed b
22. ch 1 being the least significant bit Switch 6 is unused 27 WaveMaster User Manual Commands Overview To set the GPIB address to 13 decimal the DIP switch needs to be set to represent binary 01101 refer to Figure 4 htt Figure 4 Setting the DIP Switch The commands offered are the same whether control is through RS 232 or GPIB In WaveMaster all commands are sequential The IEE488 2 commands provided for synchronization are recognized in the implementation but have no effect on the operation When using RS 232 it is not possible to generate a Service Request signal and receive a valid return The six commands used for a Service Request function have no effect when used on RS 232 the value returned will reflect the current data available or its default state When using GPIB IEEE488 for commu nication the SRQ bit is always set when data is output This protocol is mandated with WaveMaster to ensure correct and robust operation when running in a data logging mode Each command sent with any parameters is checked for correctness If an error is present or occurs the command is not executed The error is reported as a 28 Operation numeric code in the error return message The format and codes are defined in Error Formats on page 36 The user is responsible for checking any error return made In the case of multiple commands on a line all commands up to the one in error are executed the one in e
23. d Questions 41 Calibration and Warranty 45 Bs DDR ORE SPA A A A IN 45 Coherent Calibration Facilities and Capabilities nee 46 Limited Warranty SIR 47 Extended Lifetime Wanda 47 AO ds eG 48 Obtanuno Servico sesenta 49 Product Shipping InStruCtiONS oooocnccnnonoconononoconcconnoconoconn cono conocio co nocnnncnnncnos 51 Appendix A Installing a GPIB Interface Module 53 Appendix B Specifications cesseesseesseesseesees 55 vi Do EN aa a me e A A A ID SA ANDAS A oe e le Table of Contents LIST OF TABLES Front Panel Display Numbers Format a 11 Replacement Rao e 19 OPI Socket PINOUE usa 25 Serial Line Communication Parameters ooooooconicccinccnonncconaconnconn nono ncconocnnno 26 GPIB Controller Parameters nee a an 27 IEEE 488 2 Commands When Using RS 232 29 Event Status Enable and Event Status Register ooooooncccnocococccoccconnconncnnns 30 Status O A 31 Service Request Enable Retiro 31 IDN Fields sra a Mena 32 Self Tes td sus td 32 IEEE 488 2 Commands When Using GPIB enennee 33 Parameter Setting Command aaa 34 QUEEN Commander es ee 35 A een 36 Error Codes anne en ia dd 37 Frequently Asked Questions ocoooonnoniononconanonnnonononon cana ronn cono n aran cnn coronan 41 Coherent Service Centers lead 50 a ae rare 55 Front Panel Rs ee Reed 8 o A as ara ste bn ARGOS Ah a a 14 Exp
24. gles the power to the instrument When switching ON the yellow Pulse Received indicator will light and stay lit until characters appear on the display This takes a few seconds When Description switching OFF the message Powering Off appears on the display for a few seconds while the instrument shuts down BACKLIGHT Pressing this button toggles the display back light and meter lamp ON and OFF CONTRAST W A These two buttons allow the user to set a display contrast level appropriate to the ambient lighting conditions Holding the button down causes the contrast to change continuously between limits AUTOCAL Pressing this button toggles the internal automatic calibration process on and off The current state is shown in the Autocal box on the display above the button In normal circumstances AUTOCAL should be left ON to ensure measurement accuracy Turning AUTOCAL off and then on forces an immediate internal calibration UNITS Pressing this button cycles through the four available units of nm air nm vacuum wavenumber cm and frequency GHz The current unit selected is shown to the right of the measured value on the display MODE Pressing this button cycles through the three modes of CW CW Av and Pulse The mode in use is displayed in the Mode box on the display above the button PULSE RECEIVED Apart from being lit during power up refer to ON OFF on page 8 this indicator is only active when the
25. gu larly We maintain multiple NIST calibrated standards at many laser wavelengths to support the growing calibra tion needs of our customers Optical calibration is a core competency at Coherent and we strive to continually improve our methods precision and repeatability Addi tionally most of the calibrations are performed with highly automated systems thus reducing the possibility of human error to nearly zero Strict quality inspections during many stages of calibration and testing assure a precise and accurate instrument that is NIST traceable and CE marked The benefit to our customers is that instruments calibrated by Coherent will consistently perform as expected under their actual use conditions We are registered to ISO 9001 2000 our products are NIST traceable and our calibration labs are fully ANSI Z540 compliant In addition to the technological advantage we also strive to deliver the best service in the industry with a knowl edgeable and responsive staff and rapid turnaround 46 Limited Warranty Extended Lifetime Warranty Calibration and Warranty Coherent Inc the Company warrants its laser power and energy meters and sensors products Products to the original purchaser the Customer that the product is free from defects in materials and workmanship and complies with all specifications active at the time of purchase for a period of twelve 12 months Coherent Inc will at its
26. ice on page 49 The lower part of the display contains information about the state of the instrument REMOTE LOCAL Indicates whether the instru ment is being controlled from a separate computer Remote or from the front panel Local In remote mode the AUTOCAL UNITS and MODE buttons are inoperative AUTOCAL This box is positioned above the AUTOCAL button and indicates whether autocalibration is on or off In the OFF state the legend flashes to indicate that this non preferred state that is when quoted accuracy cannot be guaranteed has been selected MODE This box is positioned above the MODE button and indicates which of the three modes 13 WaveMaster User Manual CW CW Av or PULSE is currently selected Rear Panel The rear panel of the WaveMaster Figure 2 provides electrical connections and a base for upright use If the instrument is to be used in the upright mode and it is necessary for connectors to be used it is the responsi bility of the user to ensure that no strain is placed on the connectors The WaveMaster serial number is engraved on the back panel and is of the form W followed by four digits This number should be noted whenever you contact Coherent in regards to your WaveMaster a D O fo Sos E O Power 12 v 1A GPIB Upgrade Panel Figure 2 Rear Panel The items on the rear panel and their respective functions are described next 14 Sensor Description 1
27. instrument is in pulse mode In Pulse Received mode it flashes every time a valid pulse measurement is made WaveMaster User Manual INPUT This is a combined fiber optic input connector and attenuator The connector accepts the fiber optic cable that is part of the sensor assembly Turning the attenuator clockwise increases the signal delivered to the instrument and turning the attenuator counterclock wise decreases the signal The connector is of the ST type and only cables termi nated with this type of coupling must be used Attempts to use other connectors may cause damage Additionally to avoid internal damage the maximum input power to the instrument front panel attenuator must not exceed 100 mW INTENSITY This indicates the signal strength as seen by the instrument on a meter scale with red and green zones It is not a measurement of laser power The sensor and input attenuator should be adjusted so that the meter needle is in the green scale area and pref erably towards the right hand side The red region to the right ofthe scale indicates danger of signal overload The red region to the left of the scale indicates too low a signal although a valid reading may still be displayed 10 Description Front Panel Display The LCD presents all the information about the measure ment and operation status of the instrument Contrast can be controlled between limits to suit the ambient lighting conditions Additiona
28. is minimum 34 Operation Query Commands Queries return the three character mnemonic followed by and then the value returned unless otherwise indi cated Table 14 Query Commands MNEMONIC MEANING VALUE RETURNED Return front panel status LOCS if local REM if remote Return data capture mode C for CW A for CW Average P for Pulse PRD Return period between regular Integer in seconds 0 indicates turned off outputs of data RM Return Return front panel status Return front panel status status REMS ifremote LOCSiflocal if REMS ifremote LOCS if focal LOC if local UNI Return measurement units A for wavelength in air in nm V for vacuum wavelength in nm F for frequency in GHz W for wave number in cm VAL Return last valid measurement Uses VALS see Table 15 on page 36 and its time tag 35 WaveMaster User Manual VALS Format Output of measured data is provided by the VALS returned from the WaveMaster There are two fields separated by a character Table 15 VAL Format FIELD CONTENTS Integer time tag in internal timing units of 1 0 ms Measurement in currently selected units max of 8 characters including a decimal point or other text mirroring the display The same format is used regardless of whether it is a single enquiry or data being output periodically at the user s request It is the obligation of the user to remove any periodic data at a reasonable rate Field 2 text c
29. l level however is with the intensity reading in the right hand part of the green region of the scale If the display shows Multi Line then the input signal is composed of multiple wavelengths or is too wide in bandwidth Many diode lasers will exhibit this until they thermally stabilize By decreasing the input signal level using the front panel attenuator it may be possible to get wavelength readings by decreasing the very adjacent spectral lines below the detection level of the instrument Such a technique will not work with genuinely polychro matic sources Further advice on making measurements can be found in Getting the Best from WaveMaster on page 39 and Frequently Asked Questions on page 41 By connecting the WaveMaster to an external computer through either of the interfaces measurements and other instrument settings can be read stored and controlled The WaveMaster also features a mode for automatic periodic output of wavelength data and allows the computer to be used as a logging device 23 WaveMaster User Manual Remote Operation Introduction The WaveMaster offers a choice of computer interfaces for remote operation All instruments are fitted with an RS 232 connector An optional IEEE 488 GPIB inter face can be either factory fitted catalog number 33 2627 or installed by the user via an upgrade kit catalog number 1058562 Once data has been sent on an interface only that interface
30. lly 1t can be backlit together with the intensity meter to further improve visibility The upper part of the screen is used principally for the display of measurements in the selected units with a blank display indicating that no valid reading is available or possible The selected unit is indicated to the right of the numerical part of the display The number format is shown in Table 1 Table 1 Front Panel Display Numbers Format DIGITS BEFORE DIGITS AFTER UNITS DISPLAY DECIMAL PLACE DECIMAL PLACE wavenumber frequency In CW mode the display is updated at 3 Hz with the last reading taken In CW Av mode the display is updated at 3 Hz with an average of the last 10 readings taken by the instrument When the signal is removed the last reading is displayed for 3 seconds and then the display blanks 11 WaveMaster User Manual When a valid pulse is detected by WaveMaster in PULSE mode the display will show the reading for that pulse for 15 seconds or until another valid pulse or error condition is detected Note that the Pulse Received light also flashes when a valid pulse is detected There are circumstances when a valid measurement cannot be displayed or such a display is not appropriate In these cases a text message is presented in the measure ment area All such messages that can be generated by WaveMaster and the situations in which they are produced are discussed below INITIALIZING Appears immediately afte
31. loded and Sectioned View of Laser Input Sensor Front End 16 Setting The DIP Switch wessen 28 GPIB Software Protocol Example ccsccssccsscceseccsssscssccesccesacesensssees 38 vil WaveMaster User Manual viii Preface U S Export Control Laws Compliance Publication Updates Preface This manual contains user information for the Wave Master laser wavelength meter It is the policy of Coherent to comply strictly with U S export control laws Export and re export of lasers manufactured by Coherent are subject to U S Export Administration Regulations which are administered by the Commerce Department In addition shipments of certain components are regu lated by the State Department under the International Traffic in Arms Regulations The applicable restrictions vary depending on the specific product involved and its destination In some cases U S law requires that U S Government approval be obtained prior to resale export or re export of certain articles When there is uncertainty about the obligations imposed by U S law clarification should be obtained from Coherent or an appropriate U S Government agency To view information that may have been added or changed since this publication went to print connect to www Coherent com WaveMaster User Manual Symbols Used in This Document gt gt This symbol is intended to alert the operator to the presence of exposure
32. nd should not be subjected to severe shocks such as those generated when dropped The supplied shipping carton is recommended for use whenever the instrument is transported The shipping carton should be inspected for any visible damage Check that the carton contains 1 This manual 2 The WaveMaster instrument Description A further carton containing WaveMaster mains power supply plus three adapter plugs Mounting base Mounting post 2 inch dia x 75 mm Post holder 3 inch 1 4 x 20 e WaveMaster sensor Inspect each of the following items for damage as they are removed from the cartons l 2 3 4 This manual The WaveMaster instrument The WaveMaster sensor post holder and stand The power supply The desiccant packed with the instrument should be discarded Advise Coherent Inc of any shortages or damage imme diately refer to Obtaining Service on page 49 A Returned Material Authorization RMA will be issued for any damaged instruments refer to Product Shipping Instructions on page 51 WaveMaster User Manual S yste m The WaveMaster equipment consists of three units Description e The display unit The sensor The power supply Display Unit Front Panel Controls WaveMaster usen sarnmemni VESES UAT Set BN UNTA 0000005 o Figure 1 Front Panel Here is a description of the various controls and displays ON OFF Pressing this button tog
33. nditions Relative Humidity 100 mJ pulsed 1064 nm 2 nm 400 nm 3 nm 600 nm 5 nm 1000 nm 55 WaveMaster User Manual Table 19 Specifications Continued PARAMETER DESCRIPTION Operational Conditions 5 to 40 C Power Supply Unit Input 100 to 240 VAC 47 to 63 Hz Output 12V 2 5 A DC Size exc mains adapter 120 0 x 65 0 x 40 0 mm 4 8 x 2 6 x 1 6 in plugs Weight 285 0 g 10 0 oz Laser Input Sensor Size h x w x d excl 30 0 x 25 0 x 110 0 mm 1 1 x 1 0 x 4 3 in mounting pin Weight 100 0 g 3 5 oz Fiber Optic Cable Captive 2 meters long ST connector Internal Optional Filter Y inch diameter Nose Thread 0 535 inch x 40 UNC 56 WaveMaster User Manual Coherent Inc 10 2004 Printed in the U S A Part No 1079154 Rev AA
34. ng has more considerations Each message output on the GPIB interface by Wave Master sets bit O of the service request byte and thereby can be interrogated using a serial poll Once the data is seen to have been read by the GPIB controller this byte is set to 0 The setting of this bit cannot be altered by the user The use of such a serial polling scheme enables the instrument to run in a data logging mode where the host interface has to handle the unsolicited output in as much as it has not been returned in response to a specific request from the host from the PRD command Figure 5 shows an example structure for this application gt Set up device While SRQ line amp 0x40 0 Read serial poll Read serial poll to clear down bit 5 Read data While SRQ line Q Read serial poll L Loop back round handle user interface and errors amongst the above Figure 5 GPIB Software Protocol Example 38 Getting the Best from WaveMaster Operation WaveMaster is inherently capable of giving highly accu rate and repeatable results This can be enhanced by a few elementary precautions The fiber input should be fastened down to avoid any undue movement Due to mode structure changes as the fiber is moved amplitude variations may be seen if it is left so that 1ts position can change Similarly a very small change in wavelength still well within the accu racy specification may be reported as the fiber is moved Mo
35. ollect a few percent of the radiation while allowing the remainder of the radi ation to pass through The nosepiece screws into the front part of the sensor assembly 3 and the orientation of the 45 degree plate can be set by means of the lock ring 2 There is a hole in the front of the nosepiece which may be used as an axial input for a laser beam If this is used care must be taken to ensure that the energy reflected from the glass plate is absorbed safely The nosepiece can be completely removed for direct axial input 16 Power Supply Description The front part of the sensor 3 screws onto the main sensor body 6 and may be used to hold in place a 12 7 mm filter or diffuser 4 not supplied Item 5 is a plastic retaining washer The uncoated glass plate used for beam splitting in the sensor nose unit may not preserve the wave front quality in certain applications although the signal passed to the WaveMaster is of acceptable quality for its measure ment If continuous sampling of a signal in an optical set up is required then the signal to the WaveMaster sensor should be extracted using appropriate laser quality beam splitting optics As an alternative to using the sensor the user may provide their own input provided that it is a fiber termi nated in a standard ST connector for connection to the front panel of the instrument The maximum safe input to prevent damage must be limited to 100 mW although this level
36. ose unit accepts gt inch diameter filters of various thicknesses item 4 in Figure 3 on page 16 The thread on the front of the nose unit is 0 535 inch x 40 UNC item 3 in Figure 3 on page 16 The fiber optic cable on the sensor can be extended using readily available standard cables that are terminated with an ST connector on each end They should be attached to the sensor ST connector using a female female adapter These items are available from many general distributors as standard fiber patch cords intended for networking communications applications A multi mode 62 5 125 micron fiber is recommended The very high input sensitivity of WaveMaster ensures there are no problems with attenuation by the cable even if very long lengths are used Many other accessories suitable for laser applications and general optical use are available from the extensive range in the Coherent catalog Visit www Coherent com for full details 19 WaveMaster User Manual 20 Making a Measurement Operation OPERATION This section discusses the following topics o Making a measurement this page Remote operation page 24 Getting the best from WaveMaster page 39 Once the instrument has been set up press the POWER button The instrument will now cycle through its self test sequence If this does not occur refer to Frequently Asked Questions on page 41 for advice on possible easily rectified error conditions After approxi m
37. r power on while the internal hardware and software initialization takes place AUTOCAL An internal wavelength calibration is taking place AUTORANGING Internal adjustments are being made to accommodate the input signal level SATURATED The input signal level is too high and must be reduced by using the front panel attenuator or other means MULTI LINE More than one wavelength is present in the input signal or the bandwidth is too large for the instrument to resolve one wavelength line Frequently this is the case with diode lasers POWERING OFF The last message before the instru ment switches off This message usually appears as a result of operating the OFF switch Irrecoverable error situations can arise that result in automatic power off action being taken 12 Description AUTOCAL FAIL The internal wavelength calibration has failed The instrument continues operating after this occurs and will shortly attempt a further calibration cycle If it occurs as part of the power on sequence auto matic power down follows FATAL ERROR A serious irrecoverable internal error has been detected Automatic power down follows If it is a transient fault then powering back on should be possible MEM FAILURE A serious internal memory fault has been detected Contact Coherent refer to Obtaining Service on page 49 FACTORY MODE A serious internal error has been detected Contact Coherent refer to Obtaining Serv
38. re stable readings may be obtained when using CW lasers 1f the input signal is scrambled using a rotating diffuser Such a technique is inapplicable to pulse lasers The best results as with any high accuracy measurement instrument are achieved after a suitable warm up period WaveMaster requires approximately four hours to reach the best thermal stability Measurements taken during this stabilization period are still well within the accuracy specification The embedded optics are protected from vibration by the internal mounting method used but shocks adjacent to the WaveMaster during measurements should be avoided Correct alignment of the sensor can assist in getting the optimum level of signal for WaveMaster operation The sensor allows for entry of the input signal either along or perpendicular to the sensor axis The collar on the front can be rotated to align the pick off beam splitter It should be firmly tightened after setting to prevent any further rotation The nosepiece can be completely removed to 39 WaveMaster User Manual allow the maximum signal into the sensor along its axis The lever on the top of the sensor provides two options narrow field of view high sensitivity and wider field lower sensitivity WaveMaster only requires a very small amount of laser energy to make measurements If plenty of energy is available it may be enough to place a diffuser in the sensor The diffuser makes alignment much less c
39. ritical Alternatively a rotating diffuser placed just before the sensor can ease the alignment requirements and over come most of the fiber movement problems A rotating diffuser is not suitable for pulsed laser measurements When running in a logging mode the input on the inten sity meter is best adjusted to about mid scale of what is expected to be the maximum input signal level Any amplitude variations to lower signal levels are then auto matically handled by the autoranging feature and there is less chance of saturation occurring if the signal increases Note that many lasers exhibit quite wide amplitude variations when run over an extended period When taking measurements of single shot pulse lasers no triggering of the WaveMaster is required To ensure the event is captured it is recommended that the autocal ibration be turned off immediately prior to the event The autocalibration should be reinstated after the measure ment to ensure continuing measurement accuracy This procedure avoids the instrument performing a periodic autocalibration at a time critical to the user Such a sequence can be readily automated using the external communication facilities provided 40 Frequently Asked Questions FREQUENTLY ASKED QUESTIONS FAQs listed in Table 17 provide information about the internal operation of WaveMaster and answers to the most commonly encountered problems Table 17 Frequently Asked Questions QUESTION RESPONS
40. rror and any remaining commands are not executed The error return additionally indicates the numeric order of the command causing the error IEEE 488 2 These commands are largely provided for completeness Commands and compliance with this cited standard The only When Using command of practical use is TST RS 232 Table 6 IEEE 488 2 Commands When Using RS 232 MNEMONIC MEANING COMMENTS CLS Clear status registers Clears event status and status byte registers ESE Set Event Status Enable See Table 7 on page 31 register typical value is 0x34 ESE Read Event Status Enable See Table 7 on page 31 register typical return is 0x34 Event Status register query See Table 7 on page 31 Instrument Identity query See Table 10 on page 32 29 WaveMaster User Manual Table 6 IEEE 488 2 Commands When Using RS 232 Continued MNEMONIC MEANING COMMENTS Operation complete Sets bit O of ESE register on operation complete Not applicable since all operations sequential OPC Operation complete query All operations sequential so always returns 1 RST Reset The WaveMaster can only be reset through power down Command has no effect on operation Set Service Request Enable Not applicable any param register eter set has no effect See Table 3 on page 25 SRE Service Request Enable Not applicable always register query returns 0 ME Status Byte query Status Byte query query See See Table 8onpage31 8 on See Table
41. to hazardous visible and invis ible laser radiation This symbol is intended to alert the operator to the presence of dangerous voltages associated with the product that may be of sufficient magnitude to consti tute a risk of electrical shock This symbol is intended to alert the operator to the danger of Electrostatic Discharge ESD suscepti bility This symbol is intended to alert the operator to the presence of important operating and maintenance instructions Safety SAFETY Carefully review the following safety information to avoid personal injury and to prevent damage to this instrument or any sensor connected to it WaveMaster contains no user serviceable parts For service informa tion refer to Obtaining Service on page 49 The use and measuring of lasers is potentially dangerous This instrument operates over wave lengths that include non visible laser emissions Proper laser operating practice in accordance with manu facturer recommendations is vital Eyewear and other personal protective equipment must be used in accordance with applicable laws and regula tions If in doubt of correct operating procedures consult the laser manufacturer and your laser safety officer The equipment is not for use in critical medical environ ments Use only the power cord specified for the meter The grounding conductor of the cord must be connected to earth ground WaveMaster User Manual gt gt peP Do
42. vents It has even been observed on sophisticated frequency stabilized lasers when they have shown an odd period of instability This may be caused by movement of the fiber input to WaveMaster The fiber is multi mode and the various modes propagating down the fiber interfere thereby causing intensity variations at the sensor array To overcome this try to ensure that the fiber cannot move Even very small movements can cause significant intensity changes This is due to multi mode interference which causes slight changes in the distribution of energy at the sensor array The variations in wavelength however are very small and well within the accuracy of the instrument 42 Frequently Asked Questions Table 17 Frequently Asked Questions Continued QUESTION RESPONSE Why is the displayed The autocalibration may have been turned off This is indicated by measurement drifting the flashing legend in the Autocal box on the display It may also be caused by the behavior exhibited by the input source WaveMaster has the accuracy and stability to track the wavelength drift Many apparently stable sources show drift characteristics when measured to the accuracy that WaveMaster offers Pulsed YAG laser drift as the crystal heats up is easily observed as are the rapid wavelength changes a diode laser makes Why does the autocali The internal calibration is principally needed to overcome internal bration interval vary optical drift as
43. y the Company to ship the product to the Company or a repair station Customer shall package the product to protect from damage during shipping and ship it to the address specified by the Company shipping prepaid The customer shall pay the cost of shipping the Product back to the Customer in conjunction with annual recalibration and repair the Company shall pay the cost of shipping the Product back to the Customer in conjunction with product failures within the first twelve months of time of sale or between annual recalibrations A Returned Material Authorization number RMA assigned by the Company must be included on the outside of all shipping packages and containers Items returned without an RMA number are subject to return to the sender For the latest Customer Service information refer to our website www Coherent com 49 WaveMaster User Manual Detailed instructions on how to prepare a product for shipping are shown under Product Shipping Instruc tions on page 51 Table 18 Coherent Service Centers LOCATION PHONE E MAIL 1 800 343 4912 971 327 2777 info_service Coherent com Europe 49 6071 968 0 49 6071 968 499 info_service Coherent com International 971 327 2700 971 327 2777 info_service Coherent com 50 Product Shipping Instructions Calibration and Warranty To prepare the product for shipping to Coherent l Contact Coherent Customer Service refer to Table 18 on page 50 for a
44. z WaveMaster has an internal calibration system based on precisely known wavelengths of neon spectral lines Periodic recalibration is performed automatically to ensure measurement accuracy Laser input to the instrument is by means of a standard ST type fiber optic connector which means that Wave Master can be situated in any convenient position and does not require alignment with the laser source An input sensor with a 2 meter fiber cable is supplied for capturing or sampling of the beam but other inputs having a suitable connector may be provided by the user The maximum input to this front panel connector should be limited to 100 mW so as to avoid internal damage WaveMaster User Manual Unpacking A front panel intensity meter assists in aligning the sensor and in establishing a suitable signal strength level for measurement which can be adjusted by means of the built in front panel attenuator The measured value is displayed in large easily read characters on a LCD panel which also carries informa tion on the status of the instrument The display contrast may be set by the user to suit the ambient conditions and back lighting is available as required Remote operation is accommodated by means of an RS 232 serial port or the optional GPIB port available either factory fitted or as a user fitted upgrade Specifications for WaveMaster are given on page 55 WaveMaster contains accurately aligned optical components a
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