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BP209 Series

10 Application Note

Page 144

21424-D02

10.6 Bessel Fit

On of the most important properties of a Bessel beam is that it is non-diffractive. This means,
apart from Gaussian beams, their shape does not change during propagation, and they do not
have a focus in terms of a location with highest intensity along the propagation direction. Its dis-
tribution can be described by a Bessel function of the first kind.

Ideal  Bessel  beams  do  not  exist,  but  a  good  approximation  -  a  Bessel-Gauss  beam  -  can  be
achieved by focusing a Gaussian beam using an axicon lens, a narrow annular aperture, or a
axisymmetric  diffraction  grating.  The  output  of  some  step  index  fibers  can  also  have  a  profile
close to a  Bessel beam.

The Bessel fit approximates a given beam profile to a Bessel function distribution.

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Содержание M2MS

Страница 1: ...Thorlabs Beam Beam Analyzing Software 2022 BP209 VIS M BP209IR1 M and BP209 IR2 M with M2MS AL Operating Manual ...

Страница 2: ...Copyright 2022 Thorlabs Version Date 8 1 14 Feb 2022 ...

Страница 3: ...4 3 Start the Application 5 Operating Principle 15 6 The Graphics User Interface GUI 16 17 6 1 Menu Bar 17 6 1 1 File Menu 18 6 1 2 Control Menu 19 6 1 3 Options Menu 22 6 1 4 Windows Menu 22 6 1 5 View Menu 23 6 1 6 Help Menu 24 6 2 Tool Bar 25 6 3 Status Bar 25 6 4 Save Settings 26 6 5 Beam Settings 27 6 5 1 Optical Setup 27 6 5 1 1 Wavelength 28 6 5 1 2 Power Correction 29 6 5 2 Beam Profiler I...

Страница 4: ... 6 9 Plots 56 6 6 9 1 Plot Positions 57 6 6 9 2 Plot Power 58 6 6 9 3 Plot Diameters 58 6 6 9 4 Plot Gaussian Fit 60 6 6 9 5 Plot Environment Data 61 6 6 9 6 Beam Stability 7 Operation Instructions 63 63 7 1 Measurement with the Beam Profiler 63 7 1 1 Operating the Instrument 65 7 1 2 Pass Fail Test 66 7 1 3 Save Measurement Results 67 7 1 3 1 Export Device Data 69 7 1 3 2 Print Windows 70 7 1 3 3...

Страница 5: ... 2 8 5 Running the Divergence Measurement 127 7 2 8 6 Divergence Measurement Results 129 7 2 8 7 Live Adjustment 130 7 2 9 M Theory 8 Write Your Own Application 133 134 8 1 32 bit Operating System 136 8 2 64 bit Operating System 9 Maintenance and Repair 138 138 9 1 Version and Other Information 138 9 2 Cleaning 139 9 3 Troubleshooting 140 9 3 1 Warnings and Errors 10 Application Note 141 141 10 1 ...

Страница 6: ...ter 156 11 10 Drawing M2MS BP209 157 11 11 Compatibility with Older Hardware 158 11 12 List of Acronyms 159 11 13 Safety 160 11 14 Certifications and Compliances 161 11 15 Return of Devices 161 11 16 Manufacturer Address 161 11 17 Warranty 161 11 18 Exclusion of Liability and Copyright 162 11 19 Thorlabs Worldwide Contacts ...

Страница 7: ...international partners are looking forward to hearing from you Thorlabs GmbH Warning Sections marked by this symbol explain dangers that might result in personal injury or death Always read the associated information carefully before performing the indicated procedure Please read this advice carefully This manual also contains NOTES and HINTS written in this form Attention Paragraphs preceded by t...

Страница 8: ...d for beam quality evaluation examination of the reconstruc ted beam profile and monitoring long term stability Three BP209 Dual Scanning Slit beam profiler models are available with different wavelength ranges BP209 VIS M BP209IR1 M and BP209 IR2 M Each can be purchased as a met ric or imperial version For the purpose of this manual the versions are referred to a BP209xxx M The Beam Software vers...

Страница 9: ...eries of slit beam profilers using the Thorlabs Beam Software V8 0 or higher Please find the BEAM Software for download from the Beam Software website Hardware Requirements Processor CPU 3 0 GHz Intel Core i5 or Higher 1 Memory RAM 4 0 GB Graphic Card Resolution OpenGL specification GLX 1 3 up compatible graphics adapter Radeon X100 series X850 X1000 series X1600 HD series 2400 Geforce 7 series 76...

Страница 10: ...VIS AL M M2MS BP209VIS AL M Measurement System with mounted BP209 VIS M Slit Beam Profiler Power supply 100 to 240 V AC 15 V 3 A DC Cable USB 2 0 A to Mini B 3 m length Cable USB 2 0 A to Mini B angled 0 5 m length 1 pcs 0 05 Hex Key M2MS Accessory Box UV that includes 1 pcs LA4158 UV Plano Convex Lens f 250 mm UV AR coating 1 pcs LA1461 A Plano Convex Lens f 250 mm AR coating 350 700 nm 4 pcs CL6...

Страница 11: ...2 0 A to Mini B 3 m length Cable USB 2 0 A to Mini B angled 0 5 m length 1 pcs 0 05 Hex Key M2MS Accessory Box VIS that includes 1 pcs LA1461 A Plano Convex Lens f 250 mm AR coating 350 700 nm 1 pcs LA1461 B Plano Convex Lens f 250 mm AR coating 650 1050 nm 1 pcs LA1461 C Plano Convex Lens f 250 mm AR coating 1050 1700 nm 1 pcs LA5255 D Plano Convex Lens f 250 mm AR coating 1650 3000 nm 4 pcs CL6 ...

Страница 12: ... 3 1 BP209 Series The components of the BP209 VIS are labeled in the image below Aside from the mounting thread on the Mounting Plate BP209 VIS and BP209 VIS M are identical BP209IR1 M and BP209 IR2 M outer dimensions and components are identical to BP209 VIS M BP209 VIS 12 ...

Страница 13: ...erent directions Note For accurate measurement results make sure the beam enters the input aperture perpendicular to the front plane and as close as possible to the center of the aperture The rotation capability of the sensor with respect to the beam is essential for correct beam el lipticity measurements Since the major and minor axes of an elliptical beam may have arbitrary position in space the...

Страница 14: ...iler has a mounting plate with 2 threaded mounting holes All metric models have a M4 and a M6 thread and the imperial models have an 8 32 and a 1 4 20 thread Metric Version Imperial Version Please mount the BP209 Series Beam Profiler on the optical bench using a Thorlabs post post holder and a base or clamping fork ...

Страница 15: ...en be asked to confirm the installation of further Thorlabs software components Please in stall the instrument driver packages as well as the Firmware Loader Driver Package When all drivers are installed the Read Me comes up Click Next then Finish to complete the software installation 4 2 Connection to the PC Connect the BP209 Series Beam Profiler to a USB 2 0 port of your computer Use only the ca...

Страница 16: ...am Profiler instrument from your PC If an expected instrument is still missing check if the USB driver is properly installed see chapter Troubleshooting After selecting a Beam Profiler it will be connected and displayed in the Beam Settings Panel where all available settings and adjustments to the Beam Profiler can be made It is advisable to read the steps described in the chapter Measurement with...

Страница 17: ...e rotation axis This scanning axis is tilted at 45 so that the scanning directions of the slits appear as 0 hori zontal and 90 vertical respectively These scanning directions are marked as X and Y on the front of the instrument Using the rotation mount these scanning axes can be tilted to within 60 in order to adapt it to the major and minor axes of an elliptical beam Beside the two slit pairs the...

Страница 18: ...for M2 measurements connected to a PC running with OS Windows 10 The main window consists of a menu bar 1 a tool bar 2 a status bar 3 and common frame for displaying several child windows When starting the application an additional window is dis played within the main window the Beam Settings 4 panel This panel can be unpinned from the main window and moved to a different display location e g to a...

Страница 19: ...format Intensity values are saved to a text matrix There are 4 columns Column Content 1 X position in µm 2 Intensity at X position 3 Y position in µm 4 Intensity at Y position A sequential saving is available as well Details please see in section Calculation Results Print With the Print Application Window a screenshot of the Beam Profiler application is printed The Print Active Window entry prints...

Страница 20: ... next measurement result received from the instrument This function may be useful for a synchronous restart of all plots and time based measure ments Note The measurement of all beam parameters and the accumulation of calculated data is started automatically with the software start Clear Windows deletes all accumulated data and re starts the measurement Start NI Network Variables This feature is a...

Страница 21: ...e the different styles for 2D Reconstruction and 3D Profile are listed for selection There are 3 different color scale types available Better resolution of lower intensities Logarithmic Scale Linear scaling of the color bar Linear Scale Better resolution of higher intensities Quad Scale User Configured Color Scales If a certain color scale is required it is possible to create a custom color scale ...

Страница 22: ...next three columns represent the scale for lower intensities logarithmic scale and the last three columns the scale for higher intensities quad scale Such a color scale could look like this The first two rows are not part of the lut file they are shown here only for illustration Linear Scale Logarithmic Scale Quad Scale R G B R G B R G B 0 255 0 0 255 0 0 255 0 1 255 0 1 255 0 3 255 0 2 255 0 2 25...

Страница 23: ...he lower intensities limit is set to 1 of the peak in tensity to clip noise Averaging Mode None No averaging Clip Level 13 50 The clip level for calculating the ellipse and beam width is set to 13 5 of the difference between the baseline and the peak intensity Hold Maximum Disabled After reaching the max number of data to be plotted with the next data acquisition the first data set will be discard...

Страница 24: ... workspaces can be quickly selected Default Settings panel Numeric results 2D reconstruction 3D profile Profile 2D reconstruction 3D profile numeric results X and Y profiles M Beam Quality Measurement X and Y profiles Empty workspace Further the active child windows can be arranged tiled and cascaded Maximize Diagrams turns off the side and top toolbars in all child win dows simultaneously Show To...

Страница 25: ...in this manual With a click on the link Visit the Thorlabs Website this website is opened in the browser window View Thorlabs LPGL License Agreement will open the license files of the installer package Check for Update searches for available software updates About Thorlabs displays device information and software versions details If you have trouble with the software please submit the version of t...

Страница 26: ...ent of each window Open the Device Connection dialog Restore Beam Settings panel if unpinned or closed Open the Display Settings panel Reset Application Settings to defaults Open child window 2D Reconstruction Open child window 3D Profile Open child window Calculation Results Open child window X Profile Open child window Y Profile Open child window Plot Position Open child window Plot Power Open c...

Страница 27: ...urrent refresh rate of the application in frames per seconds fps 6 4 Save Settings The actual settings of the GUI including configurations of the graphical displays and the instru ment setup are automatically saved when exiting the program When starting the Beam Soft ware again the most recent settings are automatically loaded Exception Gain and bandwidth are set to Auto automatic baseline correct...

Страница 28: ...tings panel is the only child window that can be detached When starting the application this panel arranged by default within the main window Drag an drop it to any convenient location within or outside the GUI main window e g to a second PC monitor When detached the Pin icon in the upper right corner changes from to Click to this icon to bring the panel back into the GUI frame The panel view can ...

Страница 29: ...9 VIS M 500 nm BP209IR1 M 900 nm BP209 IR2 M Power Correction off 6 5 1 1 Wavelength Enter the operating wavelength in nm as a precondition for proper measurement of the Total Power The power calculation is based on the entered wavelength and the typical responsivity curve of the photo diode stored in the Beam Profiler instrument See Typical Photodiode Re sponse Curve The correct wavelength is imp...

Страница 30: ... read out and activated automatically each time after connecting this instrument Note The user calibrated power reading is correct only at the actual wavelength If the wavelength changes the power correction needs to be carried out again After executing the Power Correction it is activated automatically which is indicated by the check mark The activation state is saved in the software When restart...

Страница 31: ...f the AD converter If scanning the entire aperture 9mm the resolution will be affected only for scan rates 19 s 1 The range of resolution for these higher scan rates is 1 20 µm to 1 24 µm A higher resolution can be achieved by limiting the scanned aperture to 10 of the entire width Ø 0 9 mm see Miscellaneous With this option the resolution depends strongly on the scan rate and ranges from 0 124 µm...

Страница 32: ...ible controls are explained below Details on the individual parameters are explained in the subsequent sections Initial Settings When this Beam Profiler is connected for the first time the following default parameters are set Parameter Default Value Scan Rate 10 0 s 1 Scan Rate Correction enabled PD Bias off 1 Aperture Width full width 9 mm Active Slit Pair 5 µm Scanning Method Slit Scanning Auto ...

Страница 33: ...aseline is the ADC output signal that originates from the photo detector s dark current the output offset and noise of the ADC It results in a beam profile shift away from the zero line En abling the Auto Baseline Correction this influence is compensated It is recommended to have it enabled 6 5 3 2 Scan Rate Scan Rate Here the actual scan rate drum rotation speed is displayed Target Scan Rate This...

Страница 34: ... the perimeter of the drum and only the active slit pair is used for beam ana lysis With 5 µm slit pair beam diameters down to 20 µm can be measured using the standard Slit Scanning method If the beam diameter is less than that the Knife Edge Mode must be used instead in combination with the 25 µm slit pair This is explained in detail in the Knife Edge Mode section Scanning Mode Select Slit Scanni...

Страница 35: ...g only a single beam spot among multiple beams Rejecting ambient or stray light Reducing measurement noise Three presets are provided to chose a Calculation Area Auto Rectangle The software will analyze every image from the BP209 Series automati cally and determine the area in which a measurable amount of power is present Areas with a power level lower than the clip level will be ex cluded from fu...

Страница 36: ...noise For a steep beam profile 1 0 is an optimal clip level value If the beam profile is rather flat it might be advant ageous to lower the clip level The clip level is set by default to 1 and can be set between 0 01 and 13 5 In order to quickly return to the recommended 1 0 clip level just click to the box Default 1 0 Note The Clip Level of Calculation Area is different from the Clip Level used f...

Страница 37: ...ion Note for details 6 5 4 4 Hold Maximum The Hold Maximum feature is recommended for pulsed laser sources In all subsequent scans for each pixel only the maximum values are stored displayed and used for calculation 6 5 4 5 Autoscale to Peak Enable the Autoscale to Peak check box to scale the X and Y profiles to their peak intensit ies Disabling will scale the X and Y profiles to the value of AD s...

Страница 38: ...nate system X 0 Y 0 is the sensor center not the image center Positive X values go to the right positive Y values to the top of the image Value range 4500 to 4500 µm mW The Total Power of the beam is calculated from measurement of the total photo di ode current using its typical wavelength dependent responsivity and the power cor rection value dBm The Total Power translated from mW into dBm 10 log...

Страница 39: ... most recent N data points o Discard Last Points means that all data points beyond N will be discarded In other words after reaching the maximum number N of data points the plot stops 6 5 6 Translation Stage Control If a translation stage is detected as is the case when a M2MS measurement extension is con nected and powered the topics Translation Stage Control and M2 set appear as the last two top...

Страница 40: ...button interrupts the continuous stage travel to a target position The slider bar on the bottom of the panel has two functions it shows the stage position and the slider can be moved with the mouse in order to start a stage travel M2 Set The panel M2 Set allows to set the lens parameters for the M2MS extension such that the beam waist before the lens can be calculated The Lens Type and Focus Offse...

Страница 41: ...ssian Fit Plot Environment Data Beam Stability Beam Quality M Manual Vergence Measurement Tuning View Beam Overlapping All above windows can be opened and closed by clicking the symbols in the toolbar or by se lecting the entries in the menu Windows Additional child windows are accessible through the menu bar The appearance of the Thorlabs Beam Software can be arranged according to your require me...

Страница 42: ... from the Beam Profiler indicating the power in tensity distribution This window can be opened and closed via the menu item 2D Reconstruc tion in the window menu or via the toggle button in the toolbar The 2D image is based on a reconstruction since a slit Beam Profiler delivers measurement results of two real cross sections only the X and the Y profile The remaining pixel values are calculated by...

Страница 43: ...area of the full ROI It defines the re construction area that is used for all numerical calculations and can be displayed or hidden by toggling the button A drop down menu allows to make a choice between Automatic or Full Size additionally it can be defined by the user Detailed ex planations please see in section Beam Settings Insert X and Y Profiles Draws X and Y Profiles into the 2D graph displa...

Страница 44: ...Rotate Press right mouse button and move mouse Move Press left mouse button and move mouse Zoom Scroll mouse wheel The following table summarizes the toolbar symbols available within the 3D Profile window and its appropriate action Toolbar Icon Associated Action Opens a dialog box to specify the properties of the saved screenshots dia grams Opens the 3D Profile Settings dialog box Toggles the appe...

Страница 45: ...long the appropriate axes as marked on the front panel of the Beam Profiler The yellow curve shows the measured profile while the red curve shows the approximated Gaussian fit function and the blue the approximated Bessel fit The curves can be shown hidden by toggling the appropriate button above the diagram If Autoscale to Peak is enabled the measured curve shows relative intensities from 0 to 10...

Страница 46: ...xt to the cursor in the colors of the plotted curve 6 6 4 Zooming and Panning Diagrams All diagrams e g X and Y profiles plot diagrams M and divergence diagrams that have a slider can be manipulated for X and Y scale zoom as well as for X and Y positioning pan Zoom Mode To zoom in the diagram draw a rectangle with the left mouse button pressed Right click the diagram to revert to the last zoom act...

Страница 47: ...d via the menu item Calculation Results in the window menu or via the toggle button in the toolbar The width of the columns is predefined but can be resized With the first start of the Beam Soft ware the parameters as shown above are displayed in this table Click the marked green icon in the table in order to select or deselect parameters to be calculated and displayed The fewer calculation result...

Страница 48: ...bled from display in the Cal culation results panel the appropriate fitted curves are still shown in the X and Y Profile win dows if enabled there The units of the calculations can be changed in Beam Settings Unit If a calculation failed the value turns to For details on these parameters please see section Application Note 36 141 ...

Страница 49: ...oad Test Parameter Configuration Save Test Parameter Configuration Save Calculations opens a dialog box Select the destination folder see the preview pane Define the file name Select file format txt csv or xls Add date time stamp index optional Click Save Calculations Lock Unlock Test Parameters Load Save Test Parameter Configuration These functions are related to the configuration of the Pass Fai...

Страница 50: ...e stamp optional Save Data Select either the time interval between two records 1 to 106 sec or the n th measurement to be recorded n 1 to 105 Stop Saving after Define when the sequential saving shall be terminated after reaching a certain file size 1 to 100 MB after reaching a certain recording time 1 to 106 sec after reaching a certain number of data sets 1 to 105 Click Start Sequential Saving Th...

Страница 51: ...e or a Thorlabs RLA Series of dovetail optical rails in combination with a RC series rail carrier and a post Open the Manual Vergence Measurement Window either by selecting the appropriate item from the Menu bar Windows g Manual Vergence Measurement or simply by clicking the icon 1 Click the icon in the left upper corner to open Settings for the Manual Vergence Mea surements Select the beam diamet...

Страница 52: ...The accuracy of the entered distance between the two positions shift of the Beam Profiler is significant for vergence measurement accuracy Hint If you are using the Beam Profiler together with a M2MS Extension Set the Manual Vergence measurement is even more simple Remove the focusing lens from the system Feed the laser beam into the M2MS BP209x input aperture and align it Open in the Beam Setting...

Страница 53: ... setup Select from the Menu bar Windows Tuning View or simply click the icon The tuning view can display either two needle scales or 4 bar graphs Each scale or graph can be assig ned to one of the following parameters Sensor Saturation Total Power Ellipticity Beam Width 4s X Beam Width 4s Y Peak Position X Peak Position Y Centroid Position X Centroid Position Y Ellipse Diameter min Ellipse Diamete...

Страница 54: ...BP209 Series 6 The Graphics User Interface GUI Page 52 21424 D02 On the scales the observed minimum and maximum values are shown as blue triangles They can be reset using the buttons marked above ...

Страница 55: ...Select from the Menu bar Windows Beam Overlapping or simply click the icon Take a snapshot of the reference position by clicking to the button Save Shot 1 or Save Shot 2 The software instantly starts to overlay the live 2D reconstruction from the Beam Profiler with the captured snapshot The overlay method can be selected in the box Composite Mode Overlay Plus In Plus mode the intensities of the sn...

Страница 56: ...erlay Difference Finally in the Difference mode the intensities are subtracted The more regions appear black within the overlay the better the live image fits to the snapshot The centroid shift between snapshot and live image is displayed in X and Y axis direction R is the resulting absolute distance between these centroids For improved visualization of the overlay the intensities of the snapshot ...

Страница 57: ... Diagram Axes Move the mouse cursor over an edge of the vertical or horizontal scroll bar slider The cursor changes to ô or ó Press and hold left mouse button and move the mouse This will zoom in on the appropriate part of the diagram axis Return to default view by right clicking to the diagram Panning the Diagram Axes Move the mouse pointer over the center of the vertical or horizontal scroll bar...

Страница 58: ... of X and Y centroid positions can be displayed vs time Toolbar Icon Associated Action Save Diagram or Image Opens a dialog box to specify the properties of the saved diagram or image Save Data Opens a dialog box to specify the properties of the saved calcu lation data Clear all plots Show or Hide the grid in the diagram Autoscale ON OFF Show or hide the cursor ...

Страница 59: ...ts is not calibrated vs wavelength it is based on a typical responsivity curve of the used photo diode and the manually entered wavelength see Optical Setup Wavelength Toolbar Icon Associated Action Save Diagram or Image Opens a dialog box to specify the properties of the saved diagram or image Save Data Opens a dialog box to specify the properties of the saved calcu lation data Clear all plots Sh...

Страница 60: ... adjusts settings This allows to easily monitor the behavior of the beam diameter 6 6 9 4 Plot Gaussian Fit Menu bar Windows Plot Gaussian Fit This window plots the Gaussian Intensity value see Calculation Results which shows the coefficient of determination of the fit Toolbar Icon Associated Action Save Diagram or Image Opens a dialog box to specify the properties of the saved diagram or image 45...

Страница 61: ...v 8 1 14 Feb 2022 2022 Thorlabs Page 59 Toolbar Icon Associated Action Save Data Opens a dialog box to specify the properties of the saved calcu lation data Clear all plots Show or Hide the grid in the diagram Autoscale ON OFF Show or hide the cursor ...

Страница 62: ...sor vs time The temperature axis is located to the left yellow curve the centroid position axis blue and green curves is shown to the right Toolbar Icon Associated Action Save Diagram or Image Opens a dialog box to specify the properties of the saved diagram or image Save Data Opens a dialog box to specify the properties of the saved calcu lation data Clear all plots Show or Hide the grid in the d...

Страница 63: ...l plots Plots the trace of the centroid positions as a blue line Plots the most recent centroid position as yellow dot Plots the trace of the rolling centroid positions as a dark green line Plots the most recent rolling centroid position as a bright green dot Plots the trace of the reference positions as dark red line Plots the reference position as a bright red dot Plots the Gauss Bessel fitted c...

Страница 64: ...ies of the saved diagram or image Save Data Opens a dialog box to specify the properties of the saved calcula tion data Shows the Settings Dialog see below Reset Data Clears Beam Stability data only Stops and restarts the measurements clears all accumulated plot data Sets the zoom factor so that all data points are located within the diagram area Zoom out to the entire sensor area Show or Hide the...

Страница 65: ...inuous mea surement for a detailed analysis of a beam profile captured with the last image Also user inter actions with the GUI will work more fluently when the continuous flow of image data is stopped Measurement speed of the Beam Profiler depends on various device settings like the scan rate rotation speed of the scanning drum target resolution gain and bandwidth of the amplifier Also the number...

Страница 66: ...losed On the next software instance the BEAM software is next opened these windows and their last positions and appearances are restored Also the most recent device selection will be restored when re starting the BEAM application together with the most recent settings that were made in the set tings panel The child window 2D Reconstruction shows the measured intensity distribution across the senso...

Страница 67: ...s Test results will be displayed in the column Test only for those parameters that are selected as test criteria The selected test criteria was fulfilled test passed The test criteria Min was underrun test failed The test criteria Max was exceeded test failed Note As per definition the beam ellipse has a major and a minor axis For a pass fail test a mini mum and maximum value can be entered in the...

Страница 68: ... be changed In case of troubles please con tact Thorlabs for a solution Load Save Test Parameter Configuration The Load and Save buttons in the Calculation Results toolbar allow you to load and save the configuration of the pass fail test In order to reconstruct a pass fail test configuration automatically with the next session save the parameter to a test parameter configuration file This file wi...

Страница 69: ...abs Page 67 7 1 3 1 Export Device Data To export data to a delimiter separated text document or an image select File g Export Device Data from the Menu A dialog opens and asks for the type of file and the path where to save the file Select the desired path and file name ...

Страница 70: ...ue Text Matrix This is a CSV comma separated values file format The comment Not for import is related only to importing into the Beam Software A data file cannot be imported in order to reconstruct a beam profile Intensity values are saved to a text matrix with a header ...

Страница 71: ...e start index Check the box Sequential Saving Save Data Select either the time interval between two records 1 to 106 sec or the n th measurement to be recorded n 1 to 105 Stop Saving after Define when the sequential saving shall be terminated after reaching a certain file size 1 to 100 MB after reaching a certain recording time 1 to 106 sec after reaching a certain number of data sets 1 to 105 Cli...

Страница 72: ... box opens Here additional information can be entered in order to save it together with the test report The results of the measurement are saved to a compact test protocol It contains the Beam Profiler data and settings and selected numerical calculation results If the Reconstruction and the 3D Profile windows were activated these plots will also be included 45 ...

Страница 73: ...BP209 Series 7 Operation Instructions Rev 8 1 14 Feb 2022 2022 Thorlabs Page 71 Example ...

Страница 74: ...xamples Used Laser System Thorlabs LPS 635 FC pigtailed laser diode with adjustable collimation package Controller ThorIabs ITC4001 in QCW mode frep 1kHz tpulse 100µs Scan Rate Setting The scan rate can be set between 2 0 and 20 Hz so it cannot be set equal to the pulse repetition frequency In the above case if the scan rate is set to 10Hz each 100th pulse will be scanned Due to the high repetitio...

Страница 75: ... it If the BW is set too low the rising edge of the photo diode current is delayed and the falling edge overshoots This leads to an artificially lower peak amplitude The X profile of a 130 µm beam illustrates this Bandwidth 125 kHz Bandwidth 16 kHz At larger beam diameters higher bandwidth results in a higher noise level as can be seen for a beam with of about 3 mm Bandwidth 16 kHz Bandwidth 125 k...

Страница 76: ...ent portions of the beam pass the slit and are incident on the photo diode This way the measured power increases from zero to the total beam power re mains shortly at this level and subsequently drops to zero again Since the drum position is known exactly the original beam profile in the X and Y direction can be reconstructed with a good resolution The knife edge mode requires a proper beam alignm...

Страница 77: ...photo diode Set Aperture Width to 0 9 mm the software uses only an area of Ø 0 9 mm in the sensor center for calculation Set Active Slit Pair to 25 µm Set Scanning Mode for alignment to Slit Set Scan Rate to 2 Hz Enable Scan Rate Correction Enable X and Y profiles Disable Gaussian and Bessel fits and zoom in the profiles A proper alignment is reflected in a maximum amplitude and a flat top of the ...

Страница 78: ...ce settings dia log to Knife Edge mode Two new child windows come up they may overlay each other initially showing the recon structed knife edge profiles for the X and Y axis green curve along with the measurement data obtained in normal slit scanning method data dimmed yellow curve The numeric result window shows the beam parameters ...

Страница 79: ...timal decreasing K stands for poorer quality its reciprocal value M2 M2 1 optimal increasing M for poorer quality is used more often Please do not confuse the beam quality and times diffraction limit factor M2 1 Diffraction Limit Depending on the wavelength l and beam divergence angle q the theoretical limit for the mini mum beam waist diameter d0 is called the diffraction limit The beam waist can...

Страница 80: ...dicator of high beam quality Therefore a single shot beam shape measurement from a Beam Profiler does not provide a correct information about the beam quality Although a single Beam Profiler result is not a measure of beam quality the Thorlabs Beam Profiler Series can be used to accurately measure the beam quality For this purpose a beam propagation measurement is carried out according to the ISO1...

Страница 81: ... driver for alignment laser The beam under test enters the the focal lens 3 hits the two tilted mirrors 5 and leaves the enclosure towards the Beam Profiler s input aperture 1 The translation stage is moved step wise by the control software and in this way changes the path length between the focal lens and the Beam Profiler The maximum travel range of the stage 100 mm is doubled by the use of two ...

Страница 82: ...s for a given focal length the smaller the waist diameter the closer M is to 1 The minimum waist diameter increases at a constant M with the wavelength Limitations to the measurement of the beam diameter are given by the capabilities of the Beam Profiler see Technical Data The initial unfocused beam diameter must not exceed the maximum measurable beam diameter the waist diameter must be greater th...

Страница 83: ...C207 Series as well as the former BC106N Series to scan through the light beam in the Z axis for the beam profiler to acquire an M2 value Suitable mounting adapters for the beam profilers of the BC207 Series and BP209 Series are supplied Please see the M2MS website for other adapters and information M2MS M Measurement System Extension Set with adapters for BC207 Series and BP209 Series as well as ...

Страница 84: ... M Meter Set with BP209 Slit Beam Profiler The M2MS BP209 set features Accurate M Measurements Measures Divergence Waist Diameter Rayleigh Range and Astigmatism Compatible with CW and Quasi CW Pulsed Laser Sources Short Measurement Cycles Fully ISO11146 Compliant ...

Страница 85: ...rtation damages to the translation stage it is locked when delivered This lock must be removed prior to powering up the stage and it must be re installed for trans portation Additionally the DDS100 stage is fixed at its initial position by a solenoid controlled latch which is the left stop in the photo 2 This latch fixes the stage when the power supply is switched off and releases the stage when p...

Страница 86: ...2MS and remove the cover 3 Move the stop latch as indicated in the picture below and place the platform of the stage against the left stop Then install the transportation lock do not tighten the fixing screw yet 4 Push the platform to the left stop turn the lock counterclockwise and tighten the lock screw 5 Place back the top cover and fix it using the 4 screws Now the M2MS is ready for trans port...

Страница 87: ...ll your beam profiler of the BP209 Series on the BP209 mounting adapter Firmly press the beam profiler front against the front stopper surface and secure it in place using the supplied M6 metric systems or 1 4 imperial systems hex screw Place the mounted Beam Profiler into the recess using the dowel pins on the M2MS base plate Fix it using the supplied M4x10 Hex screws ...

Страница 88: ...on It is strongly recommended that only the supplied USB cables are used to connect the Beam Profiler and the control PC to the M2MS The use of other than the supplied USB cables may lead to USB connection instabilities Attention Do NOT connect the M2MS to a computer prior to installing the Beam Software 1 Remove the transportation lock 2 Connect AC power to the power supply and its output to the ...

Страница 89: ...n in the Device Selection window After the stage is identified and its serial number is read from its EEPROM double click the DDS100 M button in the device selection window 7 2 7 M Measurement Prior to starting the Beam Quality measurements with the M2MS and a BP209 Series Beam Profiler the beam of the laser under test needs to be aligned to the M2MS Measurement Sys tem It is important that the be...

Страница 90: ...tered to the Beam Profiler aperture during stage movement In other words the beam alignment is dependent only on the position of the light source In the common case the light source is a device with open beam output In order to direct the beam under test into the M2MS a combination of two adjustable mirrors is required Thorlabs offers a variety of such items The beam alignment is executed in 3 ste...

Страница 91: ...ted and the stage has been initialized Remove the focal lens from the magnetic holder Switch on the alignment laser Align your optical system so that the spot of the alignment laser hits the center of your light source 7 2 7 1 2 Fine Alignment After coarse alignment the beam under test needs to be fine adjusted using the Alignment feature of the M measurement panel This is executed in two steps Pr...

Страница 92: ...BP209 Series 7 Operation Instructions Page 90 21424 D02 ...

Страница 93: ...A dwell time at the end positions can be entered During the loop mode the software automatically cap tures the beam centroids yellow cross hair at the left and right stop Dwell Time Enter the desired time sec Disable the dwelling by clicking to the icon Centroid crosshair of the actual beam position Crosshair of the sensor center Beam Displacement Centroid shift in X Y direction between position 2...

Страница 94: ... For a successful alignment the optical power level must be adjusted in such way that the AD Saturation is between 40 to 95 The green bulb to the right of the numeric field indicates the GOOD range During alignment this condition must not change After initialization the stage is at Position 2 200 mm Click the capture button of Position 2 the centroid is captured and its crosshair color changes to ...

Страница 95: ...rlabs Page 93 Centroid captured at Position 2 Click to the Position 1 capture button 0 mm The stage moves to Position 1 and captures the second centroid position Centroid captured at Position 1 Now the beam displacement and the pointing angle are displayed numerically ...

Страница 96: ...e at least yellow Well aligned beam position To toggle between the two positions the movement of the stage between the two stop po sitions can be controlled automatically by the software Just push the loop button and enter a convenient dwell time value The stage starts a loop move dwelling at the stop po sition for the given time During the dwelling a realignment can be made Please keep in mind th...

Страница 97: ...BP209 Series 7 Operation Instructions Rev 8 1 14 Feb 2022 2022 Thorlabs Page 95 Alignment Move Loop To terminate the loop click the button After finishing click Next to continue ...

Страница 98: ... the CXY1 translator and the lens holder should match place the the mounted focal lens back to the magnetic holder o Make sure that the bullet next to the AD Saturation is still in green or at least yellow o Observe the actual beam position and minimize the difference to the reference using the X Y translators of the lens holder until the indicators are green or at least yellow Then click Next to ...

Страница 99: ...ivided into 6 subpanels 1 Toolbar M2 Settings Opens the Settings for the M2 measurement Auto Save Data Save Beam Profile Data during M Measurement Start Stop Starts stops a M2 measurement M Switches to M measurement Divergence Switches to Divergence measurement Save Data After a successful M measurement this button is enabled and plot data can be saved Grid Disables Enables the grid in the diagram...

Страница 100: ...ent tab 5 Selected Data Points Select in the header of this sub panel the Number of the desired measured data point For this selected point the position of stage and the profile in X and Y of the beam is displayed The table Calculation Results of the Selected Point to the right contains the following information Parameter Explanation Position Shows the actual Z position of the translation stage in...

Страница 101: ...ent accuracy par ticularly when measuring narrow beams Measurement Parameters Setting the wavelength is mandat ory for a correct M measurement If the lasing wavelength is un known measure the wavelength using a spectrometer Attention Do not use the nominal wavelength of the laser use the actual measured value Accuracy of this input significantly impacts the measurement accuracy Measurement Range T...

Страница 102: ...te if the number of measured data points is sufficient to fulfill the ISO standard require ments If so a hyperbolic fit is applied If not a second run adds additional measurements within the Rayleigh Length on both sides and or beyond twice the Rayleigh Length For a M2 measurement running the Normal Scan is highly advised The coarse scan is suitable for a first estimate of the beam waist position ...

Страница 103: ...n automatic saving of beam profile data when an M measurement is executed 7 2 7 4 1 Saving M Test Results The beam quality measurement results can be saved in two different ways 1 Save Test Results Save measurement data as CSV default The Save Test Protocol dialog opens select the desired path file name and file format csv txt or xls fill in the desired fields and click Save Below is an example 10...

Страница 104: ...Instructions Page 102 21424 D02 2 Save Test Protocol Save measurement data as pdf file The Save Test Protocol dialog opens fill in the desired fields and click Save The M Measurement Results will appear in the PDF documents 70 ...

Страница 105: ...slation stage To configure this automatic data export click the icon in toolbar on the left side of the M panel A dialog opens Section Data Export Select Enable to activate the automatic export The toolbar icon changes to and the status bar on the bottom of the GUI appears as The Data Export remains active until Disable is checked If the data shall be saved only once please check the boxes Select ...

Страница 106: ... this file is formed by appending the string device to the base file name When M Divergence Measurement Results is enabled the M test results are saved in txt or csv format as well see section Saving M Test Results Section File Select the desired target file folder for the automatic data export Choose a file name Add the date optional Add the time stamp optional Add an index optional The index mus...

Страница 107: ...ource this might take up to 1 hour The laser output is spatially and temporally stable Start the measurement by clicking the Start button You will be prompted to confirm the laser wavelength Verify the wavelength and click OK While running the measurement most of the buttons and options are disabled e g the M Mea surement Settings and the Toolbar This is intentional and prevents any settings chang...

Страница 108: ...m criteria different from the ISO standard beam width criteria were used see M Settings a successful measurement is shown without the ISO indication In general the X and Y axes do not coincide with the lab system described by the X and Y axes Furthermore the M value for X is independent from the one for Y For highly elliptical beams such as those from semiconductor lasers M2X and M2Y will differ m...

Страница 109: ... See also section M2 Theory Waist Diameter X Y is the beam diameter in the X Y direction at the focal point This is the calculated minimum beam diameter µm derived from the curve fit This value may differ from the smallest measured beam width Waist Asymmetry stands for the ellipticity at the waist position and is calculated by taking the ratio of the waist diameters in both X and Y directions A wa...

Страница 110: ...ulated from the Astigmatism values divided by the mean of the Rayleigh Length in X and Y astigmatism_rel _Y _ X R Y R X Z Z Z Z 01 01 1 1 2 Full Divergence Angle is explained in section M2 Theory Divergence Asymmetry is the ratio of the divergence angles in Y and X axes Values differing from 1 0 indicate that the beam ellipticity is changing with Z position for instance when an ellip tical beam is...

Страница 111: ... measured curves For better visualization the curves can be zoomed by dragging a rectangle As soon as the mouse pointer hits a measurement point its shape changes to Click this point The position and calculated values corresponding to the clicked point will appear in the Calculations Results of the Selected Point panel Note In contrast to the Results pane the results shown here are calculated from...

Страница 112: ...tive results become the reference Further the reference data are added to the diagram in a different color Reference Diagram Legend Beam Diameter Reference X Beam Diameter Reference Y Hyperbolic Fit Reference X Hyperbolic Fit Reference Y Clicking to the Clear icon deletes the reference data Please refer to section Saving M Test Results for details about how to save the results of the beam quality ...

Страница 113: ... are larger than 1 1 Check set wavelength see M Settings Check Clip Level of the Calculation Area 4 If the selected Clip Level is too high the beam might be cut off and the measured beam area might be smaller than the actual beam extend This results in a too small beam waist and a too small M even below 1 4 If the selected Clip Level is too low the Calculation Area and the measurement captures the...

Страница 114: ...ter focal length Rule of the thumb the beam diameter variation within the scan range should not underrun a ratio of 1 2 5 at least at one side of the beam waist see the example below q Error message The measurement is not ISO compliant because there are not enough data points inside the Rayleigh Length X Y xx mm or beyond twice the Rayleigh Length The software could not measure with the required r...

Страница 115: ...ult that sets the scan range to its maximum Check your setup to make sure the beam waist is within the scan range If no focal lens was used only a divergence measurement is possible q Error message Waist position outside the scan range Extend the scan range or switch to divergence mea surement The calculation of the hyperbolic fit from the measured data points resulted in a beam waist position out...

Страница 116: ...cus plane is minimized As the stage moves to the focal plane the Z slider on the bottom right moves under the lens fo cus LF icon The right panel shows the Beam Width and Centroid Position in X and Y Beam Width The displayed beam width is calculated based on the settings chosen in the Set tings Panel of this window opened through the icon on the left Centroid Position The Centroid position is disp...

Страница 117: ...eam Alignment The Beam Profiler has a defined input aperture so when moving the translation stage it must be ensured that the laser beam remains within the aperture Ideally the beam centroid remains centered within the aperture during movement of the stage this is a precondition for correct beam quality measurements The M2MS Measurement System is factory aligned A beam that enters the M2MS exactly...

Страница 118: ...stage has been initialized Remove the focal lens from the magnetic holder Switch on the alignment laser Align your optical system so that the spot of the alignment laser hits the center of your light source 7 2 8 1 2 Fine Alignment After coarse alignment the beam under test needs to be fine adjusted using the Alignment feature of the M measurement panel This is executed in two steps Preparation Sw...

Страница 119: ...BP209 Series 7 Operation Instructions Rev 8 1 14 Feb 2022 2022 Thorlabs Page 117 ...

Страница 120: ...e at the end positions can be entered During the loop mode the software automatically cap tures the beam centroids yellow cross hair at the left and right stop Dwell Time Enter the desired time sec Disable the dwelling by clicking to the icon Centroid crosshair of the actual beam position Crosshair of the sensor center Beam Displacement Centroid shift in X Y direction between position 2 and 1 mm T...

Страница 121: ...Make your choice The wizard starts For a successful alignment the optical power level must be adjusted in such way that the AD Saturation is between 40 to 95 The green bulb to the right of the numeric field indicates the GOOD range During alignment this condition must not change After initialization the stage is at Position 2 200 mm Click the capture button of Position 2 the centroid is captured a...

Страница 122: ...2 Centroid captured at Position 2 Click to the Position 1 capture button 0 mm The stage moves to Position 1 and captures the second centroid position Centroid captured at Position 1 Now the beam displacement and the pointing angle are displayed numerically ...

Страница 123: ...bulbs must be at least yellow Well aligned beam position To toggle between the two positions the movement of the stage between the two stop po sitions can be controlled automatically by the software Just push the loop button and enter a convenient dwell time value The stage starts a loop move dwelling at the stop po sition for the given time During the dwelling a realignment can be made Please kee...

Страница 124: ...BP209 Series 7 Operation Instructions Page 122 21424 D02 Alignment Move Loop To terminate the loop click the button After finishing click Next to continue ...

Страница 125: ...asurement M Switches to M measurement Divergence Switches to Divergence measurement Save Data After a successful Divergence measurement this button is enabled and plot data can be saved Grid Disables Enables the grid in the diagram PDF Test Protocol Saves the results of a Divergence measurement into a PDF file 2 Divergence Diagram The measured data are plotted in the diagram The 4 buttons above th...

Страница 126: ...layed The table Calculation Results of the Selected Point to the right contains the following information Parameter What does it show Position Shows the actual Z position of the translation stage in mm Azimuth Angle deg The displayed value is not relevant it is always equal to 90 Ellipticity The ellipticity of the fitted to an ellipse beam see Application Note Beam Diameter X µm Beam Diameter Y µm...

Страница 127: ...m the starting to the stopping point over which the sleigh is driven during the measure ment Start has to be at least 5 mm smaller than Stop and 0 mm Valid values for Stop are 5 mm Stop stage length Note It is advisable to set up a scan range 40 mm to ensure higher accuracy A scan over the entire translation length is often the best choice Timeout is the waiting time until valid data can be retrie...

Страница 128: ... starting the measurement make sure that The beam is aligned properly it should ideally remain centered with respect to the sensor center over the entire scan range See chapter Beam Alignment for aligning the beam Reflections and interferences are avoided as far as possible The laser system is warmed up depending on the source this might take up to 1 hour The laser output is spatially and temporal...

Страница 129: ...gative values indicate a converging beam while positive values indicate a diverging beam Note All results are calculated from the applied linear fit Full Divergence Angle X Y is explained in chapter M Theory Divergence Asymmetry Asymmetry is the quotient of divergence angles in Y and X scan direc tions Values differing from 1 0 indicate that the beam ellipticity is changing with z position for ins...

Страница 130: ...BP209 Series 7 Operation Instructions Page 128 21424 D02 Reference Measurement The actual measurement results can be saved and used as reference afterwards same as for M Measurement Results 110 ...

Страница 131: ... for ex ample collimation can be optimized until the beam width in the focus plane is minimized As the stage moves to the focal plane the Z slider on the bottom right moves under the lens fo cus LF icon The right panel shows the Beam Width and Centroid Position in X and Y Beam Width The displayed beam width is calculated based on the settings chosen in the Set tings Panel of this window opened thr...

Страница 132: ...stance from the beam waist to the position where the beam diameter has increased by a factor of Ö2 1 41 compared to the minimum diameter at the waist From the equation for d z it can be seen that the beam diameter increases linearly with z in the far field z zR The full divergence angle Θ can be calculated by For laser beams with fundamental mode TEM00 Gaussian Beam shape it can be theoretically s...

Страница 133: ...rrow wider Reasons for Non Ideal Gaussian Beam with M2 1 Using a Gaussian beam is preferred because of its minimum divergence angle and the ability to achieve the minimal focus diameter Differences to Gaussian shape can be due to existence of higher order modes amplitude and phase distortions due to inhomogeneous gain medium in lasers presence of extraordinary beams These distortions lead to a lar...

Страница 134: ...BP209 Series 7 Operation Instructions Page 132 21424 D02 The appropriate power density at z0 is reduced by a factor M Also the Rayleigh Length increases by a factor of M ...

Страница 135: ...2 bit systems only the 32 bit applications are installed to C Program Files In 64 bit systems the 64 bit components are being installed to C Program Files while necessary 32 bit components can be found at C Program Files x86 In the table below you will find a summary of what files you need for particular programming en vironments Programming environment Necessary files C C CVI h header file lib st...

Страница 136: ...2 html NI LabVIEW driver The LabVIEW Driver is a 32 bit driver and compatible with 32 bit NI LabVIEW versions 8 5 and higher only C Program Files National Instruments LabVIEW xxxx Instr lib TLBP2 TLBP2 llb LabVIEW container file with driver vi s and an example LabVIEW xxxx stands for actual LabVIEW installation folder python driver C Program Files IVI Foundation VISA WinNT TLBP2 Examples Python ne...

Страница 137: ... DotNet_Sample Thorlabs BP2_CSharpDemo Thorlabs BP2_CSharpDemo csproj Executable sample demo C Program Files IVI Foundation VISA WinNT TLBP2 Examples MS VS 2012 CSharp Demo DotNet_Sample Thorlabs BP2_CSharpDemo output Thorlabs BP2_CSharpDemo exe Example for LabView C Program Files National Instruments LabVIEW xxxx Instr lib TLBP2 TLBP2 llb LabVIEW container file with driver vi s and an example Lab...

Страница 138: ...river is required for all development environments Header file C Program Files x86 IVI Foundation VISA WinNT include TLBP2 h C Program Files IVI Foundation VISA Win64 include TLBP2 h Static Library C Program Files x86 IVI Foundation VISA WinNT lib msc TLBP2_32 lib C Program Files IVI Foundation VISA Win64 lib msc TLBP2_32 lib C Program Files IVI Foundation VISA Win64 Lib_x64 msc TLBP2_64 lib Funct...

Страница 139: ...LBP2 Examples CVI Sample CSample exe Example for C Solution file C Program Files x86 IVI Foundation VISA WinNT TLBP2 Examples MS VS 2012 CSharp Demo DotNet_Sample Thorlabs BP2_CSharpDemo Thorlabs BP2_CSharpDemo sln Project file C Program Files x86 IVI Foundation VISA WinNT TLBP2 Examples MS VS 2012 CSharp Demo DotNet_Sample Thorlabs BP2_CSharpDemo Thorlabs BP2_CSharpDemo csproj Executable sample d...

Страница 140: ... with the required return information Do not remove covers 9 1 Version and Other Information The menu entry Help à About Thorlabs displays relevant Beam Software data In case of a support request please submit the software version of the application This will help to locate the error 9 2 Cleaning The Beam Profiler has parts slits mounted to the drum that are sensitive to mechanical impacts Do not ...

Страница 141: ...sing the supplied with instrument cable Check proper driver installation Check if the green LED lights up LED off indicates that the Beam Profiler s firmware was not loaded See section Connection to the PC for details You may unplug and reconnect the Beam Profiler to a different USB port or use a different USB cable Wait a few seconds until the green LED lights up Then click Refresh Device List wi...

Страница 142: ...value Proper measure ments are impossible Resolving This warning may appear shortly after the Scan Rate has been changed the drum s inertia causes a delay in reaching a new set value After reaching the set value this warning disappears If it remains the Beam Profiler seems to be damaged and need factory repair please contact Thorlabs for return instruction q Device in Pause Mode Explanation In the...

Страница 143: ...nsformed System The transformed system of coordinates is based on the calculated beam axes minor and major axes for elliptical fit or for 4s beam diameter 10 2 Raw Data Measurements Lab or Reference or Sensor Coordinate System 4s Beam Width is the width of a beam in X and Y axes centroids derived from the second moment calculation where sx and sy are the standard deviation of the horizontal or ver...

Страница 144: ... entire area AD Saturation Saturation level of the instrument s AD converter For a good SNR signal to noise ratio the saturation level should be not below 40 and not be above 95 Total Power Total power measured through the ND filter in the drum photo diode current with respect to the typical wavelength dependent responsivity 10 3 Ellipse Fitted The beam shape is fit to an ellipse using the set cli...

Страница 145: ...oftware supports a variable clip level the beam width is always dis played with its clip level in brackets Note Please note that Beam Width is always the diameter not the radius of the beam 10 5 Gaussian Fit Measurement The beam profiles of coherent light sources such as lasers and the output of fibers show a distribution more or less close to Gaussian If focusing a Gaussian beam it converges into...

Страница 146: ...ighest intensity along the propagation direction Its dis tribution can be described by a Bessel function of the first kind Ideal Bessel beams do not exist but a good approximation a Bessel Gauss beam can be achieved by focusing a Gaussian beam using an axicon lens a narrow annular aperture or a axisymmetric diffraction grating The output of some step index fibers can also have a profile close to a...

Страница 147: ... bit Dimensions Ø 79 5 mm x 60 mm Including Rotation Mount Minimum Pulse Rate 10 Hz 2 Software Displayed Parameters and Features X Y Profile Centroid Position Peak Position Pseudo 3D Profile Beam Width Clip Level Second Moment 4s Gaussian Fit Applicable Colored Pass Fail Test Compliance with Standards ISO 11146 Beam Widths Divergence Angle and Beam Propagation Factor General System Requirements Wi...

Страница 148: ...ion Stage DDS100 M Travel Range 100mm Velocity Max 500 mm s Effective Translation Range 200 mm 100 mm to 100 mm from Focal Point Lens Focal Length 250 mm Optical Axis Height 70 mm without additional feet M Measurement Range 1 0 No Upper Limit Typical M Accuracy 5 Depending on Optics and Alignment Accepted Beam Diameter for 5 Uncertainty 20 µm 4 5 mm at Beam Profiler Input Aperture Minimum Detectab...

Страница 149: ...ence Angle 0 1 mrad Applicable Light Sources CW and Pulsed Sources kHz Typical Measurement Time 15 30 s Depending on Beam Shape and Settings General Size 300 mm x 175 mm x 130mm Weight 4 6kg 11 3 Technical Data M2MS Extension Sets Item M2MS M2MS AL M2MS Extension Set General Specifications Wavelength Range 400 2700 nm 1 250 600nm 1 Beam Profiler Compatibility BC207 series BP209 series Translation ...

Страница 150: ...s 11 Appendix Page 148 21424 D02 11 4 Typical Photodiode Response Curves The following diagrams show typical response curves photodiodes used in BP209 Series mod els Typical Responsivity UV enhanced Si Photodiodes ...

Страница 151: ...BP209 Series 11 Appendix Rev 8 1 14 Feb 2022 2022 Thorlabs Page 149 Typical Responsivity Extended InGaAs Photodiodes ...

Страница 152: ...its may be reduced when measuring total power Scanning slit mode transmits a fraction of the beam power to the photodetector and during knife edge mode the un attenuated Ø20 µm full beam is transmitted to the photodetector In addition to the two pairs of slits the rotating drum contains an aperture fitted with a neutral density ND filter that once per rotation allows the full attenuated beam to re...

Страница 153: ...al settings are applied Parameter Default value Scan Rate 10 0 1 s Scan Rate Correction enabled Wavelength 635 nm BP209 VIS 900 nm BP209IR1 BP209 IR2 Photodiode Bias off Aperture Width full width 9 mm Active Slit Pair 5 µm Scanning Method Slit Scanning Gain And Bandwidth Control Auto Gain Index ON Bandwidth Slit X 125 kHz Bandwidth Slit Y 125 kHz Auto Baseline Correction 0 ...

Страница 154: ...BP209 Series 11 Appendix Page 152 21424 D02 11 7 Drawing BP209 Drawing BP209 Series Imperial Version ...

Страница 155: ...BP209 Series 11 Appendix Rev 8 1 14 Feb 2022 2022 Thorlabs Page 153 Drawing BP209 Series Metric Version ...

Страница 156: ...he entire beam power enters the entrance aperture is scanned by the slit and detected by the photodiode Particularly for diverging beams the operator needs to know the positions and distances of these elements BP209 VIS BP209IR1 and BP209 IR2 use an aspheric collimating lens between the slit and the photodi ode ...

Страница 157: ...BP209 Series 11 Appendix Rev 8 1 14 Feb 2022 2022 Thorlabs Page 155 11 9 Drawing BP209 Mounting Adapter ...

Страница 158: ...BP209 Series 11 Appendix Page 156 21424 D02 11 10 Drawing M2MS BP209 ...

Страница 159: ...106N UV BC106N VIS Camera Beam Profiler Electrical connections and mechanical setup should be carried out as described in the appropri ate documentation to this hardware while operation is described in the manual on hand Older documentation can be downloaded from the Thorlabs Manual Archive at www thor labs com manuals cfm Open this page and enter the desired item number be careful about correct s...

Страница 160: ...mensional ADC Analog to Digital Converter AL Aluminum AR Anti Reflection BC Beam Profiler Camera CA Calculation Area cw Continuous Wave constant power source GUI Graphical User Interface ND Neutral Density PC Personal Computer FPS Frames Per Second ROI Region Of Interest USB Universal Serial Bus UV Ultra Violet wavelength range VIS VISible wavelength range ...

Страница 161: ... applying power to the PC system used to operate the Beam Profiler make sure that the protective conductor of the 3 conductor mains power cord is correctly connected to the protect ive earth contact of the socket outlet Improper grounding can cause electric shock with dam ages to your health or even death The instrument must only be operated with a duly shielded and low resistance USB cable de liv...

Страница 162: ...BP209 Series 11 Appendix Page 160 21424 D02 11 14 Certifications and Compliances ...

Страница 163: ...24 months start ing with the date of shipment in accordance with and subject to the terms and conditions set forth in Thorlabs General Terms and Conditions of Sale which can be found at General Terms and Conditions https www thorlabs com Images PDF LG PO 001_Thorlabs_terms_and_ 20agreements pdf and https www thorlabs com images PDF Terms 20and 20Conditions 20of 20Sales_Thorlabs GmbH_English pdf 11...

Страница 164: ...WEEE Thorlabs verifies our compliance with the WEEE Waste Electrical and Electronic Equipment direct ive of the European Community and the corresponding national laws Accordingly all end users in the EC may return end of life Annex I category electrical and electronic equipment sold after August 13 2005 to Thorlabs without incurring disposal charges Eligible units are marked with the crossed out w...

Страница 165: ...Settings 106 Divergence Angle 106 Divergence Assymetry 123 Divergence Display 115 126 Divergence Measurement 127 Divergence Results 125 Divergence Settings 13 Driver Installation 138 Duster Spray E 142 Eccentricity 142 Ellipse fit 142 Ellipticity 139 Error Messages 140 Errors 66 Export a PDF Test Protocol F 30 Factory device settings G 130 Gaussian beam 143 Gaussian Diameter 143 Gaussian Intensity...

Страница 166: ... Region of Interest 7 Requirements 63 ROI 11 Rotation mount 86 RS232 S 159 Safety 66 Save Measurement Results 25 Save Settings 15 scan axis 148 Sensitivity 154 Slit 15 slit scanning beam profiler 13 Software Installation 14 Start the Application 140 Status Bar 72 synchronization T 145 Technical Data 130 TEM00 66 Test Protocol 111 Time Out 130 Times diffraction limit factor M2 141 Total Power 141 T...

Страница 167: ...www thorlabs com ...

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