Autocorrelators & FROG (Ultrafast lasers)

Optical Autocorrelators are used to measure pulse duration of ultra-short laser pulses. The principle is to create two copies of the laser beam of interest with a beam splitter. The copies are superimposed in a nonlinear medium (SHG crystal), where they interact generating a third beam. As the overlap of the two copies depends on the pulse duration, analyzing the third beam allows to calculate the pulse duration.

Frequency-Resolved Optical Gating allows for a complete recovery of pulse intensity and phase of ultrashort pulses with complex shapes. It can retrieve the full time-dependent electric field and the equivalent optical spectrum with spectral phase. In other words, FROG allows you to know the duration of your laser pulses, but also how to deal with the spectral phase to achieve the shortest possible pulse duration.
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