Category Name > FROGscan
Why do I need to know the pulse chirp? Isn’t an autocorrelation good enough?

Well, I guess if all you need is some high-power, wide bandwidth photon hose, then you could just use a power meter and a spectrometer. BUT, if you want to determine peak intensities, need experimental repeatability, are doing pulse shaping, using nonlinear optics, then you need to have an accurate measurement of the pulse shape and chirp.

No form of autocorrelation will provide the pulse shape or the chirp. Usually, autocorrelation fools you into thinking that your pulses are shorter than they really are, and that they are smoother than they really are.

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