FROG Schematic Diagram
The figure shows a diagram of a FROG apparatus, including an optical delay line, the nonlinear medium, and the spectrometer. In this example, a single pulse is split, with one part used as the gate and the other part as the probe. The nonlinear region can be as simple as a piece of optical quality quartz. The inset shows that a signal pulse is sliced out where the gate and probe overlap. This signal is then dispersed by the spectrometer. The spectrogram is the set of such spectra at all possible gate delay times. Phase retrieval algorithms can recover the electric field of the pulse (both phase and amplitude) from a spectrogram.
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