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Chapter 4. Aligning a LASER Beam into FROGscan

09/07/2018 Vs 003

FROGSCAN USER’S MANUAL

Page 37

Figure 22

. Clicking Alignment Mode to

ON

turns off data acquisition and pops up an image viewer for the beam

cameras.

Figure 23

. Screen capture of the

alignment screen. In this image
the Fixed Delay Beam appears in
the lower half of the screen
because the FROG instrument
contains a hollow retroreflector
that inverts the beam.

Содержание VideoFROG FROGscan

Страница 1: ...FROGscan products are protected by United States patents 8068230 7130052 6219142...

Страница 2: ......

Страница 3: ...ompatible with VideoFROGscan All users are entitled to free software upgrades within one year of delivery of the FROGscan Software upgrades come out periodically Typically within a version software up...

Страница 4: ......

Страница 5: ...Summary Panel 23 3 4 Data Acquisition Panel 24 3 4 1 Automated Crystal Tilt Function 26 3 5 Setup and Alignment Panel 27 3 6 Pulse Display Panel 29 3 7 Pulse Analysis Panel 30 3 8 Program Information...

Страница 6: ...54 8 2 Spectral Tilt 54 8 3 Pulse Front Tilt 54 8 4 Wavelength Offset 54 8 5 Time Offset 54 8 6 FROG Trace Clipped 55 8 7 High Spatial Chirp 55 8 8 Background 56 8 9 Software Warnings 56 Chapter 9 Cu...

Страница 7: ...gistered trademarks of Microsoft Corporation Core Duo i3 i5 and i7 are registered trademarks of Intel Corporation LabView is a registered trademark of National Instruments Corporation MATLAB is a regi...

Страница 8: ...2000 nm Pulse Length Range 15 fs 12 ps Temporal Range 30 ps Temporal Resolution 2 fs or better Delay Increment 1 fs Spectral Resolution 0 20 nm 1 nm Spectral Range 100 nm 600 nm Pulse Complexity TBWP...

Страница 9: ...eet on the 1 st Turning Mirror from where they are directed through the SHG crystal to generate the Signal Beam purple In FROGscan Ultra the 2 nd Turning Mirror directs the Signal Beam through the Len...

Страница 10: ...scan The servo motor and crystal have been secured for shipping and must be released before use PLEASE READ THESE INSTRUCTIONS CAREFULLY TO AVOID DAMAGE TO THE INSTRUMENT Always wear powder free glove...

Страница 11: ...ion that is out of the way 5 Connect the Mini XLR power supply plug to the Mini XLR jack on the back of FROGscan a b c d Figure 3 The Crystal Tilt Assembly 2 3 Installing VideoFROGscan Software If you...

Страница 12: ...t click on the VideoFROGscan 9 application Select Run as Administrator 3 In the User Account Control Window click on Yes to allow the app to make changes to the computer 4 In the InstallAware Wizard W...

Страница 13: ...ult Destination Directory is C Program Files Mesa Photonics VideoFROG Scan 9 NC It is highly recommended not to change the Destination Directory Click Next to accept the directory 8 The default Progra...

Страница 14: ...rd Window to start the installation and configuration The installation will take several minutes 10 Read the information in the Important Information Window pertaining to the USB connections from the...

Страница 15: ...n program will install the Drivers for both the FTDI and the Ocean Optics Spectrometer Click on Extract to start the process for the FTDI drivers 12 Wait until the drivers are extracted 13 Click on Ne...

Страница 16: ...on I accept this agreement to accept the License Agreement in the Device Driver Installation Wizard 15 Wait while the FTDI Drivers install 16 Installation is complete when the Completing Device Drive...

Страница 17: ...the start and progress of the Omni Driver 18 Part of the Ocean Optics driver installation includes Microsoft Visual C In some cases the software requires the Visual C Redistributable Maintenance to be...

Страница 18: ...the instructions in the open Window by plugging both USB Cables from the FROGscan device to the computer and allowing the drivers to load Click OK 21 In the Driver Installation Wizard window ensure b...

Страница 19: ...on OK The software will now continue with the installation of LabView Run Time Engine Continue with the following installation steps for FROGscan Instrument with or without cameras 25 Steps 20 28 per...

Страница 20: ...xtractor unzipped 315 files The installation will now begin 28 Click Next in the NI LabVIEW Run Time Engine Installation window 29 The default Destination Directory is C Program Files National Instrum...

Страница 21: ...the Features Window click Next to accept all the default features 31 In the Products Notification Window uncheck Search for important messages then click Next 32 Accept the National Instruments Licens...

Страница 22: ...ght click on the Ocean Optics spectrometer and select Update Driver Software You can choose to find the driver automatically or Browse My Computer c Select Browse and then browse to the following dire...

Страница 23: ...e New Hardware Wizard appears click NO since the drivers were already installed during VideoFROGscan installation Then connect the Servo USB it does not invoke the New Hardware Wizard 4 Turn the power...

Страница 24: ...file that can be read by the VideoFROGscan software Page Setup Sets up printer output for printing hard copies of the screen Print Window Prints the window to a printer See Appendix B for details on...

Страница 25: ...ge 19 Figure 4 Main Menu with several data saving options and hardcopy output The directory where the data is saved is set in the VideoFROGscan Configuration program Figure 5 Operate menu with options...

Страница 26: ...Panel Section 3 4 Center Wavelength Center of the FROG Trace area used by the algorithm This number should be set to correspond to the center of the Live FROG Trace in the Summary Panel Section 3 3 In...

Страница 27: ...Chapter 3 Program Panels 09 07 2018 Vs 003 FROGSCAN USER S MANUAL Page 21 Figure 7 Important settings can be entered on the control panel on any of the eight Menu Panels...

Страница 28: ...top right corner of the screen After QUIT was clicked a set of icons will appear below the Menu Panel Figure 8 Hollow Arrow Icon Resumes VideoFROGscan Double Arrow Icon Not supported do not use Stop I...

Страница 29: ...mpling any residual background remaining after background subtraction is removed Other calculations are also performed on this Trace Retrieved FT Display of the Trace constructed from the retrieved pu...

Страница 30: ...alibration files Servo Fault Indicates a servo error Flashing indicates that VideoFROGscan has recovered a steady illumination requires the program to be exited The Control Menu contains the following...

Страница 31: ...mes to be averaged for the 3 Frame Background subtraction Meas FT A live update of the resampled and conditioned FROG Trace that is sent to the retrieval algorithm so that different background adjustm...

Страница 32: ...ing When a crystal is too thick to phase match all of the wavelengths present in the pulse at a single angle it acts like a wavelength filter that limits the bandwidth of the measured pulse When a thi...

Страница 33: ...al button is turned off and the program will update the crystal information in the display above the button Release Crystal Tilt In instruments with the crystal Autotilt function clicking this button...

Страница 34: ...ter 3 Program Panels Page 28 FROGSCAN USER S MANUAL 09 07 2018 Vs 003 Figure 14 Setup and Alignment Panel The wavelength range a given spectrometer is able to read is automatically displayed on the x...

Страница 35: ...are the Pulse Width the Time Bandwidth Product TBWP and the FROG Error The cursors in this Panel can be moved to select the pulse width to be measured and the values of the position of the cursor line...

Страница 36: ...The Time is number of samples Reset Filter Resets the exponential filter Temporal Cursor Shows the time and intensity differences in the cursors displayed on the temporal intensity plot Spectral Curso...

Страница 37: ...ctrogram was sent Lock the Loop Count Prevents the loop count from being updated Loop Count Loaded Loads after the lock loop count is clicked Loop Count per Iteration Number of algorithm iterations be...

Страница 38: ...hat is actually used in the retrieval is determined by the two parallel yellow lines The spacing between the lines is independent of the grid size and is directly proportional to the time delay spacin...

Страница 39: ...ge 33 3 10 Error Analysis Panel Under this Panel the plots of the measured and retrieved frequency and time marginals are displayed For good retrievals and measurements the measured and retrieved marg...

Страница 40: ...CTION 1 3 SAFETY CONSIDERATIONS IN THIS USER S GUIDE 3 Ensure that the LASER beam is level to the table and perpendicular to the front of FROGscan as it enters through the Entrance Iris Even small dev...

Страница 41: ...m vertically parallel to the FROGscan base using the external mirrors until the beam halves visible on the Focusing Mirror are approximately equal in size The Fixed beam is less bright than the Delaye...

Страница 42: ...ariable delay and the top half to the Fixed Delay Mirror the camera image is upside down The Fixed Delay Beam appears as a semi circle in this Figure due to the spatial zero dispersion beam splitter u...

Страница 43: ...king Alignment Mode to ON turns off data acquisition and pops up an image viewer for the beam cameras Figure 23 Screen capture of the alignment screen In this image the Fixed Delay Beam appears in the...

Страница 44: ...the intensity of the signal beam changes as the Overlap Mirror and the Last Turning Mirror are adjusted go to the Setup and Alignment Panel in VFS Click the LED button at the bottom of the spectrogram...

Страница 45: ...s below to unlock the crystal cartridge Remove the crystal bars as described in Section 2 2 Manually hold the Crystal Mount in place while the Adjustment nut is loosened or tightened Loosen the Adjust...

Страница 46: ...sing a fluorescing card confirm that the two beams hit the Iris Lens Mount equidistant from the center 2 Open the Iris on the Iris Lens mount to confirm that the two beams are approximately centered o...

Страница 47: ...enter so that the center of the Live FROG trace is at t 0 and the three autocorrelation spectra top right overlap 4 Now adjust the Overlap Mirror to favor symmetrical FROG Traces not maximum intensity...

Страница 48: ...sible loosen BUT DO NOT REMOVE the socket head cap screws that hold the Crystal holder to the base plate using a 2 5mm ball end hex driver Then move the entire crystal holder assembly forward toward t...

Страница 49: ...d the Theta angle of the crystal in nm 6 1 Changing the Crystal One crystal is installed into the cartridge at the factory aligned for horizontally polarized light and the crystal tilt is set for 800...

Страница 50: ...luded with the shipment remove the two 2 56 Socket Head Cap Screws 2 Remove the loosened bar and set aside 3 Carefully with an upwards motion slide the installed Crystal Cartridge out of the mount The...

Страница 51: ...ridge in place taking note of the Cone Point Screw location and the mating surface on the Crystal Cartridge 8 Tighten the 2 56 Socket Head Cap Screws to secure the top bar to the Crystal Mount 9 In Vi...

Страница 52: ...ure the spectrometer cable so that it is out of the way of the surrounding optical components Figure 29a 4 Use a 2 5 mm Ball End Hex Driver to loosen the spectrometer baseplate assembly and carefully...

Страница 53: ...system 4 short cage rods an adaptor and a fiber collimator usually reflective Please view the Schematic of the Kinematic Cage Mount used to mount the Fiber Schematic Collimator to FROGscan To mount th...

Страница 54: ...s so they are approximately 3mm from the Side Plate of the FROGscan The Adapter is installed in the mount at the factory It is secured in place with two retaining rings and mounted such that one of th...

Страница 55: ...6 Installing and Changing Hardware 09 07 2018 Vs 003 FROGSCAN USER S MANUAL Page 49 8 Use the Locking Ring on the Kinematic Mount to secure the Collimator in place 9 The final assembly should look li...

Страница 56: ...te results 7 2 Centering the FROG Trace in time To center the FROG Trace in time set the scan center by adjusting the servo center using Time Control on the main panel or use the automatic FROG Trace...

Страница 57: ...speckle b Too much clipping Because the Live View is on while the adjustment is being made it is easy to see the change in the size of the FROG Trace while the background is being adjusted In this ca...

Страница 58: ...Panel A check in the Background Filter box indicates that background subtraction it is on 3 Click the Background Filter button to remove speckle which causes problems with retrievals placing noise out...

Страница 59: ...G Trace errors as large as 4 5 on a 64 x 64 grid can be acceptable However in this case another check should be performed to determine retrieval quality 2 Another check for retrieval quality is to com...

Страница 60: ...problems with the pulse measurement In a single shot FROG geometry the time offset is caused by Pulse Front Tilt Quick Fix one of the following Engage automatic re centering in the top of the Left Con...

Страница 61: ...stics However even in multishot geometries such as FROGscan spatial chirp can make the FROG Trace asymmetric This occurs because the crystal may not be set at the exact focus and the interaction at th...

Страница 62: ...hen you first start the program and the servo power supply is not turned on simply turn on the servo power supply wait a moment and click OK The program should be able to recover communication with th...

Страница 63: ...d out properly It may take a minute or two but the software usually regains communication at this point and the program will operate normally If not click the red X in the upper right hand corner of t...

Страница 64: ...ginal resampled FROG Trace is provided in the form of a DLL that can be called from any program that is running simultaneously VideoFROGscan has been designed with the sharing of computer resources in...

Страница 65: ...25 16 1216 1218 2000 5 Principal components generalized projections a review Invited Daniel J Kane JOSA B Vol 25 Issue 6 pp A120 A132 2008 https doi org 10 1364 JOSAB 25 00A120 6 Characterization of...

Страница 66: ...he Computer USB 5 Servo Ready High when servo has settled Optical Delay Line only 7 Trigger In Accepts a trigger Not yet implemented on FROG 9 11 13 Digital I O Digital channels that can be set or rea...

Страница 67: ...pectral data for the gate is stored because the gate is equal to the pulse in SHG FROG and is equal to the intensity of the pulse in the case of PG FROG Appendix C Function Reference for the PCGPMonit...

Страница 68: ...dP is a pointer to a double array of length of the FROG Trace size returned from GetSize to receive the frequency domain phase This subroutine is void returns nothing All data is passed in the previou...

Страница 69: ...tarting with 0 are the real values and the odd indices are the imaginary values Calling sequence pulse is a pointer to double float array double 64 bit float of length 2 times the pulse size to send t...

Страница 70: ...hat our licensed software for a period of ninety 90 days from the date our software is received by the customer shall perform substantially in accordance with the standards set forth in the user docum...

Страница 71: ...s Appended in the following are screenshots and calibration sheets for your instrument FROGscan Calibration Sheet Servo Calibration Sheet VideoFROGscan screen captures Spectrometer Wavelength Calibrat...

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