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MesaPhotonics VideoFROG FROGscan, User Manual

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MesaPhotonics VideoFROG FROGscan User Manual Download Page 4

Summary of Contents for VideoFROG FROGscan

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

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Page 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...

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Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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