MesaPhotonics VideoFROG FROGscan, User Manual

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Chapter 3. Program Panels
09/07/2018 Vs 003 FROGSCAN USER’S MANUAL Page 27
3.5 Setup and Alignment Panel
The intensity of the signal is displayed in this Panel, which is used when the intensity of the Signal Beam
is maximized (Chapter 5).
Raw Spectrum (red) – Displays the spectrum recorded by the spectrometer.
Center Spectrum (green) – Displays the center spectrum of the FROG Trace, nominally the peak value.
Scaling – Activating this button opens a dropdown menu that enables Intensity Units to autoscale once or
display the Intensity Units in a Fixed window.
Clicking on the x-axis opens a dropdown menu with settings that allow changes to be made to the x-axis
display. For example, the autoscale can be turned off allowing small wavelength regions to be viewed
more easily.
Change Crystal – If more than one crystal is used, clicking this button tilts the crystal holder to the vertical
position for easier changing of the crystal cartridge. To change the cartridge, the top bar is removed by
removing the two 2-56 screws. The crystal cartridge then will slide out (a small amount of force may be
needed to overcome the friction of the SD card socket). Once the new cartridge is installed, the Change
Crystal 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 turns off the
servo motor control of the crystal tilt, allowing manual tilt.
Alignment Mode – Clicking this button activates the optional cameras that aid in aligning the LASER
beam into FROGscan instruments. See Section 4.2 for details on the Alignment Camera settings.
Diverter Mirror Position – Clicking this button turns the camera setting ON. A dropdown menu appears:
Delayed Beam Diverted – When this setting is selected, an image of only the delayed beam is displayed.
Both Beams Diverted – When this setting is selected an image of both beams as they appear on the
center of the cameras is displayed. Position in Degrees and Change Position indicators should only be
used with instruction from the factory.
Crystal Information Display:
VideoFROGscan will read the microSD card and present the encoded information about the Crystal on
the just above the Change Crystal button
Function – Either "PH" for a pinhole or SHG for a second harmonic generating crystal.
Crystal type – BBO (Beta Barium Borate), LN (Lithium Niobate), etc.
Angle – The cut angle of the crystal.
Thickness – The crystal thickness.
If a pinhole was installed, the angle will be "N/A" and the thickness will be the pinhole diameter, typically
50 µm.