Abstract

We describe a second-harmonic-generation frequency-resolved optical gating measurement device optimized for the characterization of few-cycle pulses in the mid-IR spectral range. The system has a temporal range of 100ps with resolution of 0.12fs, and it is capable of measuring pulses as short as 1.5  cycles  (15   fs) at 3μm. Through interchangeable beam splitters and detectors it covers a wavelength range from 800nmto5μm with up to 0.5cm1 resolution. We demonstrate measurement of a richly featured 3.2μm pulse with 9.6  cycle duration, recovering the main pulse of 96fs, as well as low-intensity post-pulses with picosecond offset. We also characterize a 100fs pulse after dispersion through a 1cm sapphire plate, comparing the measured phase difference with the calculated one.

© 2010 Optical Society of America

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