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Autocorrelator:

Autocorrelator:. Pulse to be measured. The signal field is E ( t ) E ( t- t ) . So the signal intensity is I ( t ) I ( t- t ). Beam splitter. SHG crystal. E ( t– t ). Detector. E sig ( t, t ). E ( t ). Variable delay, t. Intensity Autocorrelator:. Autocorrelation.

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Autocorrelator:

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  1. Autocorrelator:

  2. Pulse to be measured The signal field is E(t) E(t-t). So the signal intensity is I(t) I(t-t) Beam splitter SHG crystal E(t–t) Detector Esig(t,t) E(t) Variable delay, t Intensity Autocorrelator:

  3. Autocorrelation

  4. Regular + Intensity A.C: Spectrum: Amp. + Phase Pulse 1: Intensity Autocorrelation (both pulses) Pulse 2:

  5. SPIDER

  6. SPIDER

  7. SHG FROG is simply a spectrally resolved autocorrelation. Pulse to be measured Beam splitter Camera E(t–t) SHG crystal Spec- trometer E(t) Esig(t,t)= E(t)E(t-t) Variable delay, t SHG FROG is the most sensitive version of FROG. FROG

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