Abstract
Because single-shot ultrashort-pulse-measurement methods usually map delay onto the transverse spatial coordinate, a nonuniform pulse spatial profile could badly distort the measurement versus delay. Furthermore, beam-induced distortions could occur in techniques, such as GRENOUILLE, in which the pulse frequency is mapped to the angular coordinate in the orthogonal direction. We study these effects in the frequency-resolved-optical-gating (FROG) and GRENOUILLE techniques and show that they are considerably reduced by fortuitous aspects of, in particular, the GRENOUILLE beam geometry in practice. Also, we show that it is possible to remove both of these distortion effects by simply dividing the trace by a simple function of the beam input spatial profile. We demonstrate these (small) effects and their removal in GRENOUILLE measurements.
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