Abstract

We propose an in situ method to obtain information on a few-cycle pulse’s temporal structure directly from the high order harmonic spectrum. When the carrier-envelope phase (CEP) changes, a half-cycle of a pulse scans over the pulse itself and directly maps the electric field to the trace of the half-cycle cut-off energy. This map can lead to a quick and simple way to extract the real temporal information, including the envelope and the chirp, of the pulse in the process of high-order harmonic generation. This method is verified theoretically by numerical simulations and experimentally by generating high-order harmonics using CEP-controlled few-cycle laser pulse.

© 2014 Optical Society of America

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