WinCamD-LCM Use With M2DU Stage
Contents
1. fk J Cut Arial 8 IAA y Ee Wrap Text Number X I J em ox fe 2 AutoSum Aw h E iE Tp E E Z P 2 Copy Conditi F Cell I Del F Fu Sort amp Find amp aste Bru s f My n E Merge amp Center 9 00 onditional Format as e nsert elete Format ort in Format Painter 7 E 327A 3 7 ae Formattingy Tabley Styles X hg Clear Filter Select 7 Clipboard F Font F Alignment le Number F Styles Cells Editing cg fe 100 A B C D E F G H J K L M N 2 1 Lens Choice for M4 Measurement Results for Your Inputs 2 2006 2014 DataRay Inc Click for ISO 11146 criteria Lens mountto desired zero plane fs mm 3 Max Rayleigh range for stage 3 mm Dec 4 WinCamD LCM4 55 um Min beamwaist Input Far Field Divergence 0 5 Stage Model M2DU 44 mm Stage range Input Rayleigh Range ZR 1058 mm 6 Beam Quality Factor M 1 10 Beam Diameter at lens 1 04 mm 7 Wavelength 7 nm Min clear lens aperture 8 Input beamwaist diam 2W 4ie 1 mm 9 Select Lens Focal length F ym Magnification 10 Input beamwaistto lens dist s p Uun f of beam after lens 11 w arae raar eE Output beamwaist 2Wo Select lens focal length using pull p f 12 Optimize 1 Increase s then down arrow on right Standard Output Rayleigh Range ZR 13 Optimize 2 Decrease s then v options 100 150 250 and 500 Output waist to lens dist s 12. 16 2 mr NA u 0 008 NA v 0 008 Wavelength 675 nm Black X axis uv f 4xSigma Waist Astigmatism 3 Total span 42 3 mm WaistAssymetry 1 Current Z location 0 2 mm Div Asymmetry 1 lt Decrement Sample Auto USB mode Increment Sample gt gt Show 30 view C Use clip widths x y f Use ISO major minor Setup M2 Start M2 Export Data Auto M2 Setup Re Cale Recall M2 Close M2 Dialog rae AI 0 A 6 1 26 If the exposure dips below 0 25 ms Warning More attenuation recommended will appear in the Exposure area due to the risk of tailing with CCD s If the exposure rises above 200 ms Warning Less attenuation recommended will appear in the due to the risk of dark noise contribution to the ISO diameter 13 Perform a Final Scan Unless you have reason to disagree with the proposed scan range press Start M2 The software automatically performs a scan of 60 equally spaced points in z over the set range with an Average of 5 images per z position At the conclusion of the scan the software performs a weighted least squares hyperbolic fit to the data to calculate the final results M 2_u v the M values Remember the anticipated specifications M Accuracy 5 typical M Repeatability 2 typical Beam dependent Absolute accuracy better than 5 is possible but can be difficult If your beam M is actually 1 03 the value that you see may vary from 0 98 to 1 08
3. 0 250 mm focal length 47 mm aperture 500 50 500 mm focal length 47 mm aperture 4 Getting Started Short of time Save yourself time by carefully following through this User Manual the first time that you use the equipment Once you have done it properly once the next time will be simple and fast IMPORTANT You will require Windows 7 or 8 with gt 2 GB of RAM for WinCamD LCM A minimum screen size of 1024 x 768 pixels is required Recommended is 1280 x 1024 or higher If you do not have an M2DU stage and wish to perform an M measurement using a different stage manual or automatic see Section 18 Applicable Standard ISO 11146 Test methods for laser beam parameters Beam widths divergence angle and beam propagation factor Available from http webstore ansi org ansidocstore default asp requires Use of the Second Moment 40 or Variance definition of the beam diameter Averaging of 5 samples at each position in z A minimum of ten samples in z half of them shall be distributed within one Rayleigh length on either side of the beam waist and half of them should be distributed beyond two Rayleigh lengths from the beam waist DataRay offers from 10 to 60 samples in z Though this statement is slightly ambiguous we interpret within one Rayleigh length as lt zR and beyond two Rayleigh lengths as gt 2 ZR For equi spaced samples in z and an initially unknown beam waist position these sa
4. 4 Beamwaist profile AFTER lens for yd mm Shorter and longer focal Output waist position in scan Beam must NOT be flatter than beloy length options are shown The a i Lower beamwaist limit due to profiler standard BeamScope lens used to Focal plane to beamwaist 16 450 be 85 mm for 400 to 800 nm but Estimated 3 2R Scan Start position 17 these are no longer provided Estimated 0 5 2R Min Scan Stop position 18 19 20 Input beam 21 Beamwaist 2Wp 22 amp 23 24 8 gt E Output Beam aist Wi 26 pu i 27 amp fan 28 29 30 31 32 Pulsed or CW Pulsed 33 Gaussian or TopHat Gaussian 34 50 if CW Power w Comparison with Damage Thresholds of Attenuators and Beal 35 ee i If Pulsed PRR kHz 5 Jicm 3 Jicm 40 Jicm Z position in mm in the moving stage 36 If Pulsed Energy Pulse J 25 Wicm Lens Choice f 5 Enter the values for your beam in the light blue shaded cells The results of the Gaussian optics calculations appear in the dark pink shaded cells and a curve appears below The output data fields show several factors and highlights in yellow the required lens diameter plus the length of spacers required to place the beamwaist within the range of the stage The lines on the auto scaled graph show e The estimated post lens beamwaist profile e The calculated flattest acceptable beamwaist maximum Rayleigh Range for this stage e The minimum allowed beam waist for the chosen profiler If the beam wa
5. B in the main User Manual for Beam Diameter definitions c If the beamwaist profile in the propagation direction the z direction is either too flat or too V shaped the fit will be poor d With the lens provided recommended the system will measure the M of collimated lasers If you already have an appropriate beamwaist and can position it within the range of travel of the stage you can measure the M of the beam directly 5 Assemble the unit The diagram shows the unit with an 85 mm lens For longer focal length lenses the lens assembly moves to the left in the diagram below The measurement LD mm is required for the calculation of the original beam characteristics LD WinCambD U series camera Revision for LCM on mount required diagram Screw on Lens assembly M2DU WC LMB M2DU WC Mounting Block Various sizes 3 075 loving pi an Moving platform 44 mm travel 12 V input l USB 2 0 You will should have been supplied with the following parts WinCamD LCM series head M2DU LCM system comprising the following items o ND2 0 additional ND filter to screw onto the ND4 0 provided with the camera o M2DU UMove USB 2 0 stage o 3m 10 ft USB 2 0 cable A to mini B 5 o 12V PSU Power supply with power cord o Lens mount bracket and M2DU LCM AP adaptor plate o 8 pieces of 4 40 x 0 5 Philips panhead stainless steel black screws 2 spares o 1 piece of 8 32 hex head screw LNZ
6. Beam Profiling Engineered as a system Data Ray Inc User Guide Delivered as a Solution WinCamD LCM M2DU M2 system Applies to Software Ver iDataRayLCMvA30 exe or higher running under Windows 7 or 8 Very Important With full Administrator Rights Install Open and Close the latest Software before connecting the Camera or the Stage Short of time Save yourself time by carefully following this User Guide the first time Done properly once the next time will be simple and fast Once done for future convenience so you need only look at page 1 copy your lens setup details from page 7 Lens focal length LD User measured A Zo Delta LPPSO Enter in M2 dialog Zo Delta Enter in M2 dialog See diagram pages 8 See diagram page 8 Lens Principal Plane to Sensor at O Front of lens mount to Principal Plane Applications M Squared Dialog Source Beam Results Ed M measurement of CW amp pulsed lasers M measurement of focused beams Focus position of laser assemblies Zr_u 384 71 mm zry 411 04 mm Features Theta u 1 5 mr Theta 1 4 mr ASR Auto Scan Range for ISO compliant scan NA u 0 001 NA y 0 001 USB 2 0 amp 3 0 for field service applications Fast Compact Portable system LxWxH 8 x 2 9 x 4 3 200 x 109 x 74 mm Total weight 4 Ib 1 8 kg Set full range Field replaceable lens options Contents Page 1 Description 2 2 Beam Modeling for Lens Selection 3 3 P
7. If it is less than 1 0 it will show in orange as 0 98 but this does not necessarily mean that it is a bad result 2Wo_u v the beamwaist diameters Zo_u v the beamwaist positions with respect to the principal plane of the lens Zr_u v the beams Rayleigh range Theta_u v and NA_u v the far field divergence of the focused beam in mrad and as NA 14 Source Beam Characteristics Press the View Source button below the dialog to toggle between the Output beam and the source beam The software uses Gaussian beam calculations to calculate the position and dimensions of the source beam Below the curve see previous page are calculations of Waist Astigmatism s_v s_u s_u s v 2 the difference between the calculated source waist Zo distances from the lens principal plane divided by the average Zo distance M Squared Dialog Output Beam Results Wavelength 675 nm Black X axis uv 4x5igma Waist Astigmatism 31 14 Total span 32 3 mm Waist ssymetry 1 008 Current Z location 11 1 mm Div Asymmetry 1 037 Decrement Sample Auto USB mode Increment Sample gt gt Show 3D view C Use clip widths s y Use S0_majorminor Setup M2 Stark he Export Data Auto M2 Setup Re Calc Recall M2 Close M2 Dialog 370 M Squared Dialog Source Beam Results M 2 u 1 05 M 2 v 1 02 2Wo u 113 0 um 2Wo v 112 8 um Z0 V 127 40 mm NA u 0 004 Na v 0 004 Waist Asymmetry 2W
8. Use clip widths xy Use SO_majoreminor Enter the actual z position no need to include mm rather than blue value Press OK Setup M2 Start M2 Re Calc Recall M2 Close M2 Dialog The screen right will appear You may use the recommended position or one of your choosing Once the position is set press OK and after the image exposure has stabilized the next reading will be taken Reccomended next position 11 00 mm Position then press OK when ready E DATARA 1 xi The screen above will reappear with a different position option If you take too long between readings the dialog shown right a X will appear Simply select No to cancel it _ Follow through the sequence until the requested number of samples have been entered at which stage the results will Stop M2 appear instead of a dialog box As you read about using the M2DU stage you will probably have to iterate the positioning and the number of samples until the curve looks right and there are no Warnings
9. Use major minor widths clip widths at 0O and 90 deg and Use Jg major minor widths 2Wua 4Sigma Recall M2 Setup M2 Start M2 Export Dat When Use major minor ei Geos 41um 2w ae Se Close M2 Dialog widths is selected Use E E a ISO 11146 compliant e diameters and angles is aHa aaeeeo automatically selected and e DES AON S CEES AES SSS a 3 we da e aod T TEE C I a ST S ee gt y p g 7 Scale 75 0 umjdiv Peak 85 9 B 1 1 a i Peak 85 0 B 1 1 Ready If the beamwaist profile in the propagation direction the z direction is either too flat or too V shaped the fit will be poor Click on Show 3D view to see the visually more satisfying 3D view shown right P M2data txt Notepad File Edit Format View Help M Squared data file for wincamob Date Wavelength 632 nm cli level uy 4Sigma Waist Astigm wavelength 632 nm otal span 21 9 mm aist Assyme x i i Current Z location 9 9 mm Div Ae TARAS IRE T cli pl evel uv 451 gma Total span 34 3 mm l Sample 1 280 826 ZW Click on Export Data to export the data to an sample 2 279 640 2wy M2data txt file in Notepad which may be saved for Sample 3 774 422 ZW subsequent analysis and from which the data may be Sample 4 769 503 JW exported into Excel Sample 5 763 449 2wy Click on Recall M2 to browse for and open previously Sele i 7 a a e F sa
10. XXX YYY Achromatic lens in holder plus spacers Assembly Attach the WinCamD LCM series head to the M2DU LCM AP mounting Block using the 8 32 screw Use a 3 32 or 2 5 mm hex key Attach the M2DU WC Mounting Block to the rear of moving platform on the M2DU stage using two 4 40 x 0 5 screws and the two holes closest to the LCM See image on page 1 The mounting block overhands the rear of the moving platform by Attach the M2DU WC LMB lens mount bracket to the front of the M2DU stage using two 4 40 x 0 5 screws Optional Attach the M2DU WC LMB lens mount bracket to an optical table breadboard or other hardware using two 20 x 0 5 screws you supply If your hardware is Metric use M6 x 12 5 mm caphead screws you supply Optional To mount it higher attach either through these holes or to the 4 20 threaded holes in the base of the M2DU IMPORTANT If you use the threaded base holes screw length inside the unit must never exceed 0 375 10 mm Add the LNZ XXX YYY lens assembly ay Device Manager File Action View Help Important If connecting to USB through a hub it must be a m Hm E powered hub Connect the 12 V power supply to the M2DU ana I Connect a USB 2 0 cable between the M2DU and the PC After 4 gy photonics finding the hardware and installing the drivers the Device ap Batteries Manager should show them as shown right cae JE Computer 6 Laser Safety The beam will suffer some back reflection f
11. arts List 4 Wavelength 632 nm Black X axis 4 Getting Started a FOR Sey cims Moist Aston 5 Assemble the unit 5 Current Z location 0 1 mm Div Asymmetry 6 Laser Safety 6 lt lt Decrement Sample Manual mode Increment Sample gt gt 7 Preset the Attenuation level correctly 6 Show 3D view Use clip widths at O and 90 deg C Use major minor widths 8 Start the Software 7 Setup M2 Save M2 Export Data 9 Align the Beam 8 Auto M2 Setup as Recall M2 Close M2 Dialog 10 Set the Capture Block 8 11 Check Exposure amp optionally subtract residual noise 9 12 Perform a Coarse Scan 9 13 Perform a Final Scan 10 14 Source Beam Characteristics 10 15 Save the data 11 16 Second time around 12 17 Support 12 18 Manual M with a different translation Stage 13 Future software updates are downloadable from http www dataray com downloads html 1 Description The USB 2 0 M2DU accessory converts WinCamD LCM beam profiling cameras into a compact fully ISO 11146 compliant M measurement system The M2DU system comprises a lens fixed to the front of a 42 5 mm travel stage on which the WinCamD is carried An achromat refocuses an input beam to a waist within the stage travel range Lens focal lengths and coatings will be recommended supplied A spreadsheet simplifies the choice ASR auto sampling measures the hyperbolic region about the waist and at zR gt 2 in accordance with the ISO standard A least s
12. be 2W0 m o A definition of M in terms of a measured diameter is ZR M M 0 2W9 An Specifications Max Input beam at max Mag s F at profiler res limit Max beam diams See graph right 25 100 mm standard lens 400 to 800 nm with standard lens E 150 mm lens option S 20 266 to 1150 nm with optional lenses ex 250 mm lens option amp To 1350 nm on high power beams with A 15 500 mm lens option optional lenses E M Range 1 to gt 50 Q M Accuracy 5 typical 5 x lt M Repeatability 2 typical Ss 0 Beam dependent Achieving absolute accuracy 200 400 600 800 1000 1200 1400 1600 1800 better than 5 is possible but can be difficult Wavelength nm 2 Beam Modeling for Lens Selection An intuitive Excel spreadsheet simplifies lens selection You may have already received this spreadsheet during the purchase process If not download http www dataray com assets xls Lens choice for M2 measurement xlsm from the Documentation section at the website and model your beam in order to ensure that it can be correctly measured with the received system H S5 H a Ez ia EB H z Lens_choice_for_M2_measurement xlsm Excel D O FILE HOME INSERT PAGE LAYOUT FORMULAS DATA REVIEW VIEW DEVELOPER QI Macros 2013 Andrew MacGrego aia a vil a oo co oo le
13. e to scan stage position is not fixed and must be entered Use a mm scale tape to measure LD the distance from the front of the lens flange with dust cap removed to the back of the Lens Mount Bracket the red double arrow labeled LD on the diagram two pages earlier This is a distance that is easy for you to measure LD must then be corrected for the distance between the front of the lens and its Principal Plane the Zo Delta value from the lens label and for the distance A between the rear of the lens bracket and the sensor in the camera Averages per Sample eo ms wma Add LD to A Zo Delta and enter this value as the LPPSO Lens Principal Plane to Sensor at 0 entry in the dialog c Enter the Zo Delta value from the lens label in the M squared dialog gt Zo Delta mm Lens rear principal plane to front of mount d Copy LPPSO amp Zo Delta to the front page for your future convenience Stage Setup C 20 Cancel LD mm User measured 1 A 33 mm Rear of lens mount bracket to sensor Lens mount bracket Lens LD User measured A Zo Delta LPPSO Enter in M2 dialog Zo Delta On lens label copy to dialog LNZ f mm Diam See diagram below See diagram Lens Principal Plane to Sensor at O Front of lens mount to Principal Plane Let s double check You did all your calculations in mm and to 1 mm or better correct Translation Stage maximum travel is au
14. erver and tell us how to download them or try using http www sendthisfile com 18 Manual M with a different translation Stage If you have a WinCamD camera but no M2DU unit the procedure is identical particularly with respect to alignment exposure laser safety capture block etc Before trying to perform a Manual M you must first read and understand the full document carefully except for items relating specifically to the parts list and assembly of with the M2DU unit Exceptions to the procedure are as follows a Stage Travel Determine the length of travel of your alternative z stage be it motorized or manual b Stage Readout The stage must have a readout in mm be it digital or manual c Source diameter amp location To additionally determine the waist diameter amp z location of the source beam Zo Delta l LPPSO lt gt Lens You need to know the focal length mm and back focal length mm of your lens Enter in the table below Lens mount You need to determine the distance Zo Delta mm from the front of your lens mount to the rear principal plane of the lens Enter in the table below Lens mount You need to determine the distance LPPSO mm from the lens rear principal plane to the sensor plane when at O on your measurement scale Enter below Lens focal length Lens back focal length LPPSO Enter in M2 dialog Zo Delta Enter in M2 dialog Lens Principal Plane to Sensor at O Front o
15. f lens mount to Principal Plane d Move the camera in z and determine that the waist is around 50 to 75 along an attainable range of travel e At Step 8 above when the M Squared Setup dialog screen squared Setup x opens enter the listed parameters plus the Translation Wavelength in nm Number of Samples stage maximum travel 632 8 nm LPPSO see User Guide 72 mm c 10 Lens Focal Length in mmn Sa i 00 0 mm f 20 20 Delta from table in User Guide m 6 70 mm Translation stage masimum travel if manual 100 60 25 40 Averages per Sample oe Pe tS e ULB ae Stage Setup Cancel f g h When you start the software with no M2DU stage WisguaedDialiog Output Beam Results x connected the M Squared Dialog will say Manual mode below the graphic area of the dialog Set the camera to your start position which need not be zero on the scale Press Go and let the image and exposure stabilize Press Start M2 Obviously Auto M2 Setup is grayed out if you do not have an eae she Weipa eye Cetra ree Enter Parameter Dialog x Enter curent position in mm View Source Set full range Cancel The position highlighted in blue is the software s best guess at what the position will be based upon the entered stage range and the number of steps You may use these values or you may ignore them your call Increment Sample gt gt Show 3D view
16. f the scale to move the stage to the lens end Press Go to let the exposure adjust Press Auto M2 Setup to perform a coarse scan of 20 equally spaced points in z using the full length of the stage with an Average of 2 images per z position Orange Data During the scan through a beamwaist the software changes the Exposure to accommodate the change in the irradiance as the beam diameter changes During Exposure iteration before the correct Exposure is determined the Peak will sometimes go to 100 and the numbers will turn Orange to warn of this saturation Do not worry The software only uses data taken when the exposure has stabilized and the Peak is below 100 At the conclusion of the scan the software performs a hyperbolic weighted least squares fit to the data to calculate the approximate position of the beamwaist z0 and the Rayleigh Range ZR Select Use ISO_major minor to get true M2 values Based on these values the software produces estimates of the full results More importantly the ASR Auto Scan Range software module sets upward pointing white tick marks on the scale at the suggested Start and End positions for a 11146 compliant scan If the scan is too flat for an accurate M fit because the far field is not adequately reached within the range of the scan in accordance with the Standard then Warning Beam waist too shallow will appear M Squared Dialog Output Beam Results Theta u 16 3 mr Theta v
17. ist is too small for the camera or the curve is too flat warnings with advice will appear next to the values You may need to be in the far field of the laser in order to form a beamwaist within the range of travel of the stage Avoid destruction of your camera sensor For the calculated value of 2Wo boxed in green above from the curves in the WinCamD manual page 1 7 for CW 1 8 for pulsed determine whether you will need to add additional sampling attenuation in order to avoid saturation of the camera at the focus If so add as required before proceeding An additional ND2 0 filter is provided as standard Chapter 5 of the WinCamD manual describes attenuation and sampling solutions DataRay offers additional ND filters variable ND filters wedge samplers amp holographic beam samplers to assist you 3 Parts List WinCamD LCM series head The recommended default camera is the WinCamD LCM4 M2DU LCM system comprising moving stage lens mount and camera mount LNZ UV VIS NIR or TEL lens system with focal length options as below may change Lens focal length options Wavelength options 75 100 mm focal length 22 mm aperture 100 100 mm focal length 22 mm aperture 150 150 mm focal length UV Fused silica singlet for 250 450 nm 22 mm aperture VIS Achromat for 400 800 nm 150 50 150 mm focal length 47 mm aperture NIR Achromat for 630 1100 nm 250 250 mm focal length TEL Achromat for 1000 1800 nm 22 mm aperture 250 5
18. mple position requirements of the standard are met by a minimum of 18 samples at zR 3 intervals about the waist e g from 3 ZR to 2 67ZR To ensure that we spatially sample the actual beamwaist diameter within 1 requires the z samples around the beamwaist to be spaced at ZR 3 5 intervals For equi spaced samples the samples in the zR to 2 zR region are additional to the specific requirements of the Standard but may still be used in the calculation The beam diameter equals 2Wo at the beam waist 1 greater 2 02Wo at 0 14zZR 2 greater 2 04Wo at 0 20zZR x 1 414 greater 2 83Wo at zR Rayleigh Ranges or length x 2 236 greater 4 47Wo at 2ZR 5 38Wo at 2 5zZR x 3 162 greater 6 32Wo at 3ZR x 2 692 greater ISO 11146 requirements can also be met by more samples at a higher sampling frequency in ZR A least squares hyperbolic fit to the data Notes a With a beam profile that is a pure Gaussian the Variance Second moment definition is exactly the same as selecting a 13 5 Clip Level but if your beam is non Gaussian which is most beams the Variance method is more consistent An exception to this general rule is that the presence of a significant background level above zero or background noise will skew the Variance reading to larger values b In accordance with Section 5 1 of the ISO 11146 Standard the Second Moment calculation integrates over 99 of the total energy in the profile See Appendix
19. o_u 2Wo_v the ratio of the calculated source diameters Divergence Asymmetry Theta_u Theta_v the ratio of the calculated source divergence angles Important The source Zo_u ZO_v values are given as measured from the front of the lens holder not from the lens principal plane This is because this is a distance you can easily measure For this particular beam Zo was 860 5 mm so the estimates are accurate to a surprisingly good few 15 Save the Data Press Save M2 to save the Mititimmmumume cnr TN Mtr Riri CMe tet eer Mister fn ae aloo a lette 30 ite j dears aS a at file If RII ERASME T 86 BEXYOEL you forget to do so a Delta 432 1 um Pixel 11956 18 2 M42 v 1 00 warning will appear before gmafa 74 um 2Wo_v 75 um you start another M2 scan LS ipib 50 0 38086 um Zo_v 37705 um 6830 um 11 5 mr Theta_v 11 3 mr lt lt Decrement 2W_Major 74 um 0 006 NA_v 0 006 Sample and Increment 2W_Minor 73 um Sample gt gt scan th rough 2W_Mean 73 um i t start Set full range the planes of the individual Eff diam 76 um re measurements Ellipticity 0 98 i M Squared Dialog Saved files contain the original images so you may switch between Use Xe 182um Wavelength 632 nm Black X axis Cliplevel uv 4Sigma Total span 34 3m Current Z location 38 2 mm lt lt Decrement Sample Manual mode Increment Sample gt gt Tow Show 3D view Use clip widths at O and 90 deg
20. oint adjust the laser or the rear of the M2DU to center the laser beam on the camera target d Lock down the laser and the M2DU stage e Remove the lens amp camera covers Open amp Start the software f Verify that Peak ADC is lt 90 If not revisit Sec 4 www DataRay com 10 Set the Capture Block In order to minimize the size of saved M2 files it is recommended that you minimize the Capture Block If you ignore this advice your default M file size will be 100 s of MB and your RAM will fill rapidly We suggest a 512 x 512 Capture block Press Alt S to open the Capture Setup box In the M Squared Dialog box click at the extreme ends of the gray scale and watch the image in the Capture Setup box r USB Capture Setup USB 2 0 version Capture Resolution FULL 5 50 5 50 microns C FAST 11 00 11 00 microns Capture Block camera pixels C 256x256 C 128x128 C 768x768 Six5i C 1280x1280 C 1024x1024 C 2048x2048 C 1536x1536 C Custom 2048x x 2048 Y X size must be a multiple of 128 Flip image vertical Flip image horizontal V Enable auto baseline substraction If the image moves more than 25 of the screen readjust your beam alignment until it moves less than this With the stage at the lens end select a Capture Block around five times the visible beam size In most cases 512 x 512 should suffice Click OK For CW lasers Auto exposure sets correct exposure for all Z
21. ower with a power meter 8 Start the Software Start the software Click the M button A series of warnings advise that the software will in turn e Set the Clip a level to 4sigma e Set Full resolution Turn off the filter io Clip level entry Width calculation methods e Force the crosshairs to zero degrees eer Ip level metno Accept all the offerings by clicking Yes or OK r Enable knife edge mode Filter on turn it off now Angular Divergence or Pointing Enable Pointing Enable Angular Divergence p oie om Source to imager distance in mm 0 00 mm Angular Divergence Options Default I x y 4 Cos theta 2 Slit Scanners WinCam Effective Slit C Option I x y 4 Cos theta 3 WinCam Line profiles C Option PolarCam simple radial M Squared Setup Wavelength in rnm 670 0 nm LPPSO see User Guide 0 0 mm Lens Focal Length in mm 35 0 rm 20 Delta from table in User Guide 6 70 rm Translation stage maximum travel if manual 44 0 mm You will then see the WinCam M squared Setup box a Enter Wavelength in nm and Lens Focal Length b LPPSO If you require that the software calculate the source beam characteristics you need to measure a critical distance The flexible lens focal length wavelength amp spacer options means that lens Principal Plan
22. quares hyperbolic fit to the second moment diameter data allows calculation of the M value and related parameters for both the focused beam and the source beam M Beam Quality Factor Explained M2 or Beam Quality Factor is a dimensionless parameter that characterizes the degree of imperfection of a real world laser beam The closer the M value is to 1 0 i e the closer the beam is to TEMoo Gaussian perfection the closer the beam can be focused to its diffraction limited spot size Due to limitations of the optical cavity the lasing medium and or the output ancillary optics most beams are not the perfect diffraction limited Gaussian profile pure TEMoo mode described in textbooks Complex beams can contain multiple TEM contributions leading to high values of M At its simplest M may defined as The ratio of the divergence of the actual beam to that of a theoretical diffraction limited TEMoo beam with the same waist diameter The measured far field full angle divergence of the actual beam Q The theoretical far field divergence of a perfect TEMoo Gaussian beam which has the same waist diameter oN as the measured beam 0 Where 2Wo The second moment 40 beam waist diameter The shape of the M curve may be shown to be hyperbolic of the form Where zr is the Rayleigh Range defined as the distance at which the beam diameter is V2 5 greater than the diameter at the waist ze may be shown to
23. rom lens surfaces and ND filters and from the housings if the beam is ERT UER misaligned You are totally responsible for your own gt eB DVD CD ROM drives laser and eye safety and that of others in the gt t Ne eae u ETT Eg ALI l controlli vicinity If you cannot accept this responsibility X T proceed no further pran JA Mice and other pointing devices gt AS Monitors gt a Network adapters gt Jp Other devices gt E Portable Devices 7 Preset the Attenuation level correctly JF Ports COM amp LPT Avoid destruction of your camera If you did not already do eins JES Sensors so earlier for the value of 2Wo calculated in the Beam Modeling for Lens Selection Excel sheet above from the curves in the WinCamD manual page 1 7 for CW 1 8 for pulsed determine whether you Universal Serial Bus controllers will need to add additional sampling attenuation in order to avoid gt USB Virtualization saturation of the camera at the focus If so add as required before 4 USBIO controlled devices proceeding An additional ND2 0 filter is provided with the M2DU vg DataRay Inc USB 2 0 M2DU Stage VID 1632 PID 4001 ly Sound video and game controllers JE System devices Chapter 5 of the WinCamD manual describes attenuation and sampling solutions DataRay offers additional ND filters variable ND filters wedge samplers amp holographic beam samplers to assist you Verify the lens incident p
24. tomatically read from the stage EEPROM when a stage is present Click OK and the M Squared Dialog shown right will appear Particularly on smaller displays to stop it from blocking the screen resize the main screen x away from its default full screen setting 9 Align the Beam Correct alignment is critical to successful operation A misaligned beam can lead to astigmatism and to overestimation of the M value You are aiming for on axis to 2 mm max The M2DU stage sets the optical axis at a height of 3 08 78 2 mm above the base The lens and camera covers have black on white beam target crosshairs with 5 and 10 mm circles These are useful for visible lasers The lens cameras have a central hole For NIR and telecom lenses the lens cap includes a pink fluorescent phosphor on the cap For the camera end you may require suitable wavelength imaging plates or viewers With these covers in place M Squared Dialog Output Beam Results lt lt Decrement Sample Increment Sample gt gt Show 3D view Use clip widths x y Use 1SO_major minor Setup M2 Start M2 Save M2 Export Data Auto M2 Setup Re Calc Recall M2 Close M2 Dialog Auto USB mode a Click on the right hand edge of the gray scale to move the stage to the end closest to the motor b Align the beam on the target with a hole in it on the front of the lens c Rotating about the front lens cap center as pivot p
25. values x 768 1280 J Y 768 1280 Drag capture box to desired location ae ADC Peak 84 0 Pixel multiply factors a m OOmv x 11 000 Y 11 00 lv Y IR Camera and Compensation file settings Lock ADC offset disable auto adjust T Enabl Gamma Compensation file location nable 1 00 Browse Complo 10 20 CompHi 5 00 PolarCam axis Compensation file settings Enable F Show raw data as blue line Browse i Slower clock 30Mhz vs 48Mhz I Tracking On Set defaults Cancel fo 00 Enter 11 Check Exposure Check Exposure Move the stage in z by clicking on the scale until the beam diameter is at or close to minimum CW beams Adjust any attenuation sampling until the Peak ADC is lt 90 and that at the beamwaist 0 25 ms lt Exposure time lt 5 ms If it is not revisit Section 4 above Pulsed laser beams Currently the software averages multiple pulses and varying the Exposure time effectively varies the number of pulses averaged The minimum PRR for which the system will work reliably in default mode is around 1000 Hz Ensure that at the beamwaist both 0 2 ms lt amp 10 000 PRR ms lt Exposure time 20 ms A later release may extend these limits Setting the maximum exposure limit to 1 000 ms instead of 200 ms can extend the upper exposure limit to 200 ms but the increase in dark current spikes will affect the M accuracy 12 Perform a Coarse Scan Click on the left hand side o
26. ved files Sample 8 248 453 ZW Sample 9 243 805 wy sample 10 238 641 awh 16 Second time around Sample 11 234 034 2 why When the software is closed it saves the current Sample 12 226 380 ew settings sample 13 220 645 EAIN 16 244 EW 210 786 EW 205 546 2 wy sample 14 If the laser power and alignment have not changed Sample 15 substantially all you need to do is rerun the software sample 14 If anything has changed revisit that section only 17 Support If you get an error message press Alt Prt Sc to put it to the clipboard and then Ctrl V to put it into an email message Sometimes these are diagnostic warnings rather than something more significant and clicking the OK button allows you to proceed If you get a result which makes no sense and rechecking the procedure did not help then 1 Scan through the saved images to see whether or not you have a dirt dust exposure time or Capture block issue affecting the image 2 If 1 showed nothing that explained the problem then save a m2_wef file or at least an wecf image saved from the data set Email the file with comments to support dataray com Then as necessary call 303 543 8235 7 30 to 18 00 Mountain time zone GMT 7 hours Note that m2_wef files can be large ten s of MB We can receive large files but your email server may restrict attachment size In that case either put them to an FTP location on your s
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