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Autocorrelators & FROG

Autocorrelators 

used to measure pulse duration. The basic principle is to create two copies of the incoming beam, with a beam splitter. Those copies are superimposed in a nonlinear medium, 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.

·        Single-shot autocorrelator, it needs one single pulse to measure the duration, Only two minutes are necessary to get the measurement.

·        Multi-shot autocorrelator, it uses an optical delay line to scan the delay, and each pulse allows to know the intensity for a particular delay. It can measure pulses with energy as low as 50 pJ.

FROG Frequency-resolved Optical Gating.

It is a technique for a complete characterization of ultrashort pulses, thus it can retrieve the full time-dependent electric field, and the equivalent optical spectrum with spectral phase. In other words, FROG allow you to know the duration of your pulses, but also how to deal with spectral phase to reach the shortest possible duration.

·        Single-shot FROG, it needs one single pulse to measure the duration. Its innovative algorithm allows a real-time pulse retrieval.

·        Multi-shot FROG, It uses an optical delay line to scan the delay, and each pulse allows to know the intensity for a particular delay. It can measure pulses with energy as low as 50 pJ. The same device can measure very short pulses and long pulses, from 5 fs to 80 ps

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