MesaPhotonics VideoFROG FROGscan, User Manual

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Chapter 6. Installing and Changing Hardware
09/07/2018 Vs 003 FROGSCAN USER’S MANUAL Page 43
Chapter 6. Installing and Changing Hardware
FROGscan systems enable data acquisition at different wavelengths without the need for purchasing a
separate instrument. All that is needed to switch between different wavelength measurements is to
change the crystal and the spectrometer. The relationship between a desired wavelength and the angle of
the crystal required for that wavelength is illustrated in Figure 26.
Figure 26 . Relationship
between the wavelength
and 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 nm or 1550 nm according to customers’ specifications.
The custom crystal and a 5/64 Ball point Hex L-key tool needed for replacing the crystal are included with
FROGscan or FROGscan Ultra.
Ensure that the input LASER is blocked and that LASER light is not entering the FROGscan.
Heed all warnings and safety precautions as expressed throughout the Manual.
Always wear powder free gloves when working with optics.
Follow the steps below:
1. In VideoFROGscan, open the Setup and Alignment Panel (Figure 14) and click on Change Crystal ,
turning on the green indicator.