Development and Automation of a SFG-FROG System with Labview
Frank Quadt · MPG.PuRe (Max Planck Society) · 2018
In this thesis a device was build up for determining the amplitude as well as the phase of an ultrashort infrared LASER pulse, a socalled SFGFROG device.Here SFG stands for sum frequency generation and describes the creation of electromagnetic waves in the range of 690 nm and 740 nm with the help of the combination of a LASER pulse with 800 nm and an infrared LASER pulse between a wavelength range of 3000 nm and 12000 nm.The detection of ultra short infrared pulses are challenging.This why there are practically quite no commercial detectors available.The used semiconductor elements just covers a small wavelength range and are partially expensive.To create a low cost solution a nonlinear crystal was used to shift the task in the visible region.Available detectors are much more sensitive for visible light than for any other spectral regions due to their semiconductor properties.For the measurement a combination between a spectrometer and an autocorrelator was used.