BeamScope Use With M2DU Stage
Contents
1. Beam Profiling Engineered as a system T a N Data Ray nc User Guide ARSA Solution BeamScope M2DU M system Draft Applies to Software Ver 6 00S6St or higher running under Windows XP with SP2 or higher Vista or 7 Very Important With full Administrator Rights I nstall Open and Close the latest Software before connecting the BeamScope or the Stage Windows Vista See link at website 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 0 Front of lens mount to Principal Plane Applications M Squared Dialog Source Beam Results Ed M measurement of CW amp pulsed lasers Miz u 1 05 Miz 1 03 M measurement of focused beams nio u 570 0 um 2Wo o v 587 3 um Focus position of laser assemblies Zo u 869 69 mm Zo V 882 36 mm 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 v 0 004 USB 2 0 for field service applications Fast Compact Portable system Lx W XH 8 x 2 9 x 4 3 200 x 109 x 74 mm Total weight 4 Ib 1 8 kg Vi2. cm When you start the software with no M2DU stage connected the M Squared Dialog will say Manual mode below the graphic area of the dialog Set the BeamScope 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 M2 stage The following dialog will appear Enter Parameter Dialog x Enter curent positon in mm 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 Enter the actual z position no need to include mm rather than blue value Press OK LS ee teen Stage Setup Cancel M Squared Dialog Output Beam Results x NA u 0 000 NA v 0 000 View Source Set full range lt Decrement Sample Increment Sample gt gt Show 3D view Use clip widths xy Use l50_major minor Setup Mz Start M2 Re Calc Recall M2 Close M2 Dialog h 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 The screen above will reappear with a different position option DATARA 1 x Reccomended next position 11 00 mm Position then p
3. 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 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 0 Front of lens mount to Principal Plane d Move the BeamScope in z and determine that the beam diameter variation is around 50 to 75 along an attainable range of travel about the waist e f g At Step 8 above when the M Squared Setup dialog screen squared setup x opens enter the listed parameters plus the wavelength in nm Translation stage maximum travel Number of Samples 632 8 nm ers LPPSO see User Guide 72 mm c 10 Leng Focal Length imn mm 15 100 0 mm f 20 20 Delta from table in User Guid o Delta from table in User Guide mR 6 70 mm C 40 Translation stage maximum travel if manual 100 b Averages per Sample
4. 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 t s v 2 the difference between the calculated source waist M Squared Dialog Output Beam Results M42 u 1 05 0 uU 14 58 mm Theta_u 12 9 mr Theta v 12 7 mr NA u 0 006 NA Y 0 006 Set full range Wavelength 632 nm Cliplevel uy 45igma Total span 21 9 mm Current Z location 0 1 mm lt lt Decrement Sample Increment Sample gt gt Show 3D view Use clip widths at O and 90 deg C gt Use major minor widths Setup M2 Export Data Recall He Close M2 Dialog Black x axis Waist Astigmatism Waist Assymetry Div Asymmetry 0 032 mm 65 1 037 Manual mode Start Me Source Beam Results fx M52 v 1 03 z2iVio Y 587 3 um M S quared Dialog M 2 u 1 05 Zio u 570 0 um Zo u 269 69 mm Zr_u 384 71 mm zry 441 04 mm_ Theta_u 1 5 mr Theta v 1 4 mr Zo Y 882 36 mm NA u 0 001 NA Y 0 001 Zo distances from the lens principal plane divided by the average Zo distance Waist Asymmetry 2Wo_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 Th
5. Open amp Start the software 10 Perform a Coarse Scan 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 M Squared Dialog Output Beam Results Orange Data During the scan through a beamwaist the software changes the Gain to accommodate the change in the irradiance as the beam diameter changes 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 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 If the calculated M2 value is below 1 0 the values will appear orange The software will still show the value FAG ELE eee D ASigma Watat Astigavatism 0 043 mm but the orange color indicates that something is set up Total span 46 6 mm WaistAssymetry 8 531 wrong Reread this User Guide from the start and if Current Z location 42 5mm_ Div Asymmetry 1 028 you cannot work out wh
6. EEPROM when a stage is present _ lt lt Decrement Sample anual mode ple gt gt Show 3D view Use clip widths at 0 and 90 deg Use major minor widths Click OK and the M Squared Dialog shown right will appear Recall M2 Setup M2 StatM2 Close M2 Dialog To stop it from blocking the screen resize the main screen away from its default full screen setting E x 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 cover has black on white beam target crosshairs with 5 and 10 mm circles These are useful for visible lasers The lens BeamScopes have a central hole For NIR and telecom lenses the lens cap includes a pink fluorescent phosphor on the cap For the BeamScope end you may require suitable wavelength imaging plates or viewers With these covers in place 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 on the front of the lens c Rotating about the front lens cap center as pivot point adjust the laser or the rear of the M2DU to center the laser beam on the BeamScope Aim position Not sure what this is See manual d Lock down the laser and the M2DU stage e Remove the lens amp cover
7. at the problem is save the file and contact support Auto mode Increment Sample gt Show 30 view Use clip widths at O and 50 deg CO Use major minor widths Setup Me Save Mz Export Data Start Me Auto M2 Setup Recall Me Close M2 Dialog 11 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 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 12 Source Beam Characteristics Press the View Source button below the dialog to toggle between the Output beam and the source beam The software uses
8. auto sampling measures the hyperbolic region about the waist and at zR gt 2 in accordance with the ISO standard A least squares 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 Seas cope ge head eek Ge M2DU BS Js 45 mounting blo Axis height Lens mou nt bracket Different fro M Beam Quality Factor Explained M 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 TEMo9 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 0 The theoretical far field divergence of a perfect TEMoo Gaussian beam which has the same waist a diameter as the measured beam 0 Where 2Wo The seco
9. equire Windows XP with SP2 Vista or 7 with gt 512 MB of RAM for BeamScope with the M2DU If you only have lt 512 MB of RAM then with this multiple image based measurement system you will probably find that your computer slows significantly even freezes and there is nothing that we can do to help you A minimum screen size of 1024 x 768 pixels is required Recommended is 1280 x 1024 or higher Windows Support We no longer support Windows 2000 If you see problems in Windows 2000 which we do not see in XP then we will not put effort into curing them we will simply recommend that you move to XP or Vista If you do not have an M2DU stage and wish to perform an M measurement using a different stage manual or automatic request a separate User Manual entitled BeamScope Manual Z Entry M 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 with
10. er 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 B 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 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 screw on Lens assembly various sizes 3 075 78 1 mm WinCamD U series camera V If ordered as a BeamScope M2DU system you should receive the unit completely or partially preassembled If not assemble as follows You will should have been supplied with the following parts BeamScope U series head M2DU BS system comprising the following items O O O O O M2DU UMove USB 2 0 stage 3 m 10 ft USB 2 0 cable A to mini B 5 DRPSU 12 1 25 1 Power supply with US power cord M2DU BS Mounting Block M2DU BS LMB Lens mount bracket LNZ XXX YYY Achromatic lens in holder plus spacers For some ap
11. ew Output Set full range Field replaceable lens options Contents Page 1 Description 2 2 Beam Modeling for Lens Selection 4 3 Parts List 5 Wavelength 632 nm Black X axis 4 Getting Started Bo o a Waist Asiumaiem 9035 5 Assemble the unit 7 Current Z location 0 1 mm Div Asymmetry 1 037 6 Laser Safety 8 lt lt Decrement Sample Manual mode Increment Sample gt gt 7 Preset the Attenuation level correctly 8 Show 3D view Use clip widths at O and 90 deg Use major minor widths 8 Start the Software 8 Setup M2 Save M2 Export Data 9 Align the Beam 10 Auto M2 Set ome Recall M2 Clase M2 Dialog 10 Perform a Coarse Scan 10 11 Perform a Final Scan 11 12 Source Beam Characteristics 11 13 Save the data 12 14 Second time around 13 15 Support 13 16 Manual M with a different translation Stage 13 Future updates are downloadable from http www dataray com support swareupg html 1 Description The USB 2 0 M2DU accessory converts BeamScope beam profilers into a compact fully ISO 11146 compliant M measurement system The M2DU system comprises a lens fixed to the front of a 44 mm travel stage on which the BeamScope is carried An achromat refocuses an input beam to a waist within the stage travel range The standard is 100 mm focal length Alternative lens focal lengths and coatings will be recommended supplied for some lasers A spreadsheet simplifies the choice ASR
12. ged substantially all you need to do is rerun the software If anything has changed revisit that section only 15 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_ bsf file or at least an bsf 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 16 Manual M with a different translation Stage If you have a BeamScope 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
13. ields cp eres p Lens Choice for M Measurement 2006 2006 DataRay Inc Click for IS0 11146 criteria Clicking on the Excel cell offers both input advice and the Select Profiler BeamScope P 2 5 um slits 40 um Min beamwaist selection of options where Stage Model M2DU 44 mm Stage range appropriate Beam Quality Factor M Wavelength i 1 05 675 nm Input beamvraist diam 2VV 2 mm i Select Lens Focal length F 150 mm Input beamwaist to lens dist 300 mm Optimize 1 Increase s then wary F if necessary Optimize 2 Decrease s then wary F if necessary Output data fields Lens mount to desired zero plane Max Rayleigh range for stage Input Far Field Divergence 6 Input Rayleigh Range ZR Beam Diameter at lens Min clear lens aperture Magnification f of beam after lens Output beamwaist 2VVo0 Output Rayleigh Range zR Output waist to lens dist s Output waist position in scan Focal plane to beamwaist Estimated 3 zR Scan Start position Estimated 0 5 2R Min Scan Stop position Tei Add t ee mm_ 60 Sample interval in um 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
14. in one Rayleigh length as lt zR and beyond two Rayleigh lengths as gt 2 ZR For equispaced samples in z and an initially unknown beam waist position these sample 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 equispaced samples the samples in the zR to 2 zR region are superfluous 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 20ZR x 1 414 greater 2 83Wo at zR Rayleigh Ranges or length x 2 236 greater 4 47Wo at 2ZR x 2 692 greater 5 38Wo at 2 5zR x 3 162 greater 6 32Wo at 3ZR 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 larg
15. is 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 13 Save the Data Press Save M2 to save The eee et RATES oN o a aN eee A O Maaa LATET ARRAS Le Se results as a wcf file If ed eR A ered Setup E 2 S Wx xx xun F O 1 8 6 AME xYEBL you forget to do so a f aP 091 oO Delta 432 1 um Pixel 11956 18 2 warning will appear before gmafa 74 um 2Wo_v 75 um you start another M2 scan LSlipib 50 0 38086 um Zo_v 37705 um 6830 um 11 5 mr Theta_v 11 3 mr lt lt Decrement 2W_Major 74um 0 006 NA v 0 006 Sample and Increment 2W_Minor 73 um M Squared Dialog Sample gt gt scan through i tetat postion Setfulrange the planes of the individual a measurements i Saved files contain the original images so you may switch between Use Xe 182 um Yc 390 um 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 Use major minor widths clip widths at 0 and 90 deg and Use 3 major minor widths 2Wua 4Sigma 74 um M aw Recall M2 Setup M2 StatM2 EmotDaa 2Wub 50 0 41 When Use major minor aaa am ae TF Close M2 Dialog widths is selected Use ISO 11146 compliant m i a
16. le or other rigid mount Connect the 12 V DRPSU 12 1 25 1 A power supply to the M2DU Connect a Batteries USB 2 0 cable between the M2DU and the c t PC The Found New Hardware USB 7 z o Device wizard will appear Do not let it DataRay Inc USB2 0 devices search on the web Select No not this a DataRay gt USB2 0 MZ Stage vi vID 1632 PID 4001 time then ask it to Install the software automatically Recommended It should find and install the driver highlighted in this Device Manager screen 6 Laser Safety The beam will suffer some back reflection from lens surfaces and ND filters and from the housings if the beam is misaligned You are totally responsible for your own laser and eye safety and that of others in the vicinity If you cannot accept this responsibility proceed no further 7 Preset the Attenuation level correctly Avoid destruction of your BeamScope If you did not already do so earlier for the value of 2Wo calculated in the Beam Modeling for Lens Selection Excel sheet above from the curves in the BeamScope manual page 5 10 determine whether you will need to add additional sampling attenuation in order to avoid saturation of the BeamScope at the focus If so add as required before proceeding An additional ND2 0 filter is provided with the M2DU Chapter 5 of the BeamScope manual describes attenuation and sampling solutions DataRay offers additional ND filters variable ND filters wedge samplers amp h
17. nd 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 gt greater than the diameter at the waist zg may be shown to be 2W0 n W6 T A definition of M in terms of a measured diameter is M Z Jezw Specifications Max Input beam o 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 on eee S 20 P 190 to 1150 nm with optional lenses 250 mm lens option To 1350 nm on high power beams with A 15 900 mm lens option optional lenses E 2 N 10 M Range 1 to gt 50 3 M Accuracy 5 typical 5 x lt M Repeatability 2 typical S Beam dependent Achieving absolute accuracy better than 5 is possible but can be difficult 200 400 600 800 1000 1200 1400 1600 1800 Wavelength nm 2 Beam Modeling for Lens Selection An intuitive Excel spreadsheet simplifies lens selection Some customers will have already received this spreadsheet during the purchase process If not download http www dataray com files Lens choice for M2 measurement xls from the User Manuals section at the website and model your beam in order to ensure that it can be correctly measured with the received system Input data f
18. olographic beam samplers to assist you Verify the lens incident power with a power meter 8 Start the Software Start the software Click the M2 button A series of warnings advise that the software will in turn e Set the Clip a level to 4sigma e Turn off the filter Accept all the offerings by clicking OK You will then see the M squared Setup box M Squared Setup a Enter Wavelength in nm and Lens Focal Length b LPPSO If you require that the software calculate the Wavelength in nm source beam characteristics you need to measure a critical 632 9 rm distance LPPSO see User Guide The flexible lens focal length wavelength amp spacer options 60 5 mm means that lens Principal Plane to scan stage position is not Lens Focal Length in mm fixed and must be entered 35 0 mm 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 It must then be corrected for the distance between the front of the lens and its Principal Plane and for the distance between the rear of the lens bracket and the Averages per Sample sensor in the BeamScope 0 Delta from table in User Guide 6 70 mm Translation stage maximum travel if manual 44 0 mm 2 Add this value to the value shown in the table below fo
19. plications wavelengths a different LNZ XXX YYY will have been provided where XXX is the focal length in mm and YYY is the coating wavelength range This will come with one or more spacer tubes that set the lens at the correct distance Two 4 40 stainless steel black screws Three 1 4 20 and one M6 stainless steel black screws Attach the M2DU BS Mounting Block to the rear of moving block on the M2DU stage using two 20 screws Attach the BeamScope series head to the M2DU BS Mounting Block using two 4 40 x 0 5 screws Attach the M2DU BS LMB lens mount bracket to the front of the M2DU stage using two 4 40 x 0 5 screws Optional Attach the M2DU BS LMB lens mount bracket to an optical table breadboard or other hardware using two 4 20 x 0 5 screws you supply If your hardware is Metric use M6 x 12 5 mm caphead screws you supply To mount it higher attach either through these holes or to the threaded holes in the base of the unit 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 The standard lens provided is a 100 mm achromatic If you use a longer focal length lens use an appropriate additional spacer tube These are provided by DataRay when the longer focal length lens is provided with the system Optionally but recommended use the lower slot in the Lens mounting bracket to bolt the whole assembly to an optical tab
20. r the lens see label on lens and enter this value in the LPPSO Lens Principal Plane to Sensor at 0 entry in the dialog Cancel Enter the Zo Delta value for the lens in the dialog Copy LPPSO amp Zo Delta to the front page for your convenience Lens LD User measured A Zo Delta LPPSO Enter in M2 dialog Zo Delta Enter in M2 dialog LNZ f mm Diam See diagram below See diagram below Lens Principal Plane to Sensor at O Front of lens mount to Principal Plane User s own lens _ LNZ 75 UV LNZ 75 VIS LNZ 75 NIR LNZ 75 TEL LNZ 85 VIS 33 1 Fixed a7 a Legacy lens 9 7 LNZ 100 UV LNZ 100 VIS LNZ 100 NIR LNZ 100 TEL LNZ 150 UV LNZ 150 VIS LNZ 150 NIR LNZ 150 TEL LNZ 150 50 UV LNZ 150 50 VIS LNZ 150 50 NIR LNZ 150 50 TEL LNZ 250 UV LNZ 250 VIS LNZ 250 NIR LNZ 250 TEL _ sd LNZ 250 50 UV LNZ 250 50 VIS LNZ 250 50 NIR LNZ 250 50 TEL LNZ 500 50 UV LNZ 500 50 VIS LNZ 500 50 NIR LNZ 500 50 TEL LD mm User measured Zo Delta mm Lens rear principal plane to front of mount M Squared Dialog 0 0 mr Theta _v 0 000 NA v mount bracket 5 et full range to sensor Lens mount bracket Let s double check You did all your calculations in mm and to 1 mm or better correct Zo Delta Enter the value for your lens from the table above Translation Stage maximum travel is automatically read from the A _ lt lt Decrement Sample Manual modi Increment Sample stage
21. ress OK when ready If you take too long between readings the dialog shown right Ca 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 appear instead of a dialog box Stop M2 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
22. ries profiler The recommended default BeamScope is the BS8 XY2 5 um series M2DU WC XXX XXX system comprising the following options Standard System Options e g M2DU WC 250 NIR Lens focal length options Wavelength options 75 100 mm focal length 22 mm aperture 100 100 mm focal length M2DU WC 22 mm aperture 150 150 mm focal length UV Fused silica singlet for 250 450 nm pou aad 22 mm aperture USB 2 0 M2DU Stage 2 5 um steps 44 mm travel 3 m flexible cable Lens mount bracket Mounted lens Power brick 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 50 250 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 This User Guide assumes that the BeamScope system is installed has been run with the Version 6 00R12i or higher software in the PC you are to use iS working in your PC and that you have already learned how to use the BeamScope in standard operation on beams from this laser If this is not the case first install the software install and run the BeamScope and understand its operation before working with the M2DU stage IMPORTANT You will r
23. spacers required to place the beamwaist within the range of the stage The lines on the auto scaled graph show Beamwaist profile AFTER lens for your beam Beam must NOT be flatter than below this line e The estimated post lens beamwaist profile an Lower beamwaist limit due to profiler resolution e The calculated flattest acceptable beamwaist maximum Rayleigh Range for this stage 300 The minimum allowed beam waist for the chosen profiler If the beam waist is too small for the BeamScope or c a the curve is too flat warnings with advice will appear next to the values You may need to be in 200 the far field of the laser in order to form a F beamwaist within the range of travel of the stage E Avoid destruction of your BeamScope r 150 x sensor For the calculated value of 2Wo boxed y co in green above from the curves in the BeamScope manual page 5 10 determine whether you will 100 need to add additional sampling attenuation in order to avoid saturation of the BeamScope at the focus If so add as required before proceeding 50 An additional ND2 0 filter is provided as standard Chapter 5 of the BeamScope manual describes attenuation and sampling solutions DataRay offers 0 additional ND filters variable ND filters wedge 0 10 20 30 40 50 samplers amp holographic beam samplers to assist a l you z position in mm in the moving stage 3 Parts List BeamScope P7 or P8 se
24. t Saas as Scale 75 0 umjdiv Peak 85 9 B 1 1 Ready diameters and angles is automatically selected and any clip level is ignored 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 Click on Export Data to export the data to an M2data txt file in Notepad which may be saved for subsequent analysis and from which the data may be exported into Excel M2data toct Notepad Seles File Edit Format View Help Wavelength 632 nm f z Cliplevel ASi Waist Asti M Squared data file for wincamb Date soara 2 ASM ee Ree SUE wae ength 647 rm Current Z location 9 9mm_ Div Asymmetry f Cliplewe l 4sigma Total span 3 mm 2626 ow 549 ow CEE ow 105 ow 4495 ow 164 ow B60 ZW 453 ow 805 ow 6471 2 why 034 2 why 380 wy 645 EW 24A EW 780 wy 146 wy Sample 1 2wu Sample 2 2wu Sample 3 2Wwu Sample 4 2Wwu sample 5 2Wwu Sample 6 2Wwu Sample 7 2wu Sample 8 2wu Sample 9 2Wwu sample 10 2wu sample 11 2wu sample 12 2wu sample 13 2wu sample 14 2wu sample 15 2wu sample 14 lt Click on Recall M2 to browse for and open previously saved files 14 Second time around When the software is closed it saves the current settings If the laser power and alignment have not chan
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