Abstract

Phase-locked terahertz transients with peak electric fields of 108MVcm and center frequencies continuously tunable from 10  to  72THz are generated via difference-frequency mixing of two parametrically amplified pulse trains from a single white-light seed. Free space electro-optic sampling with 8fs gating pulses from a two-branch Er:fiber laser allows us to monitor all transients directly in the time domain. We identify extreme terahertz nonlinearities in the detector crystal with subcycle resolution.

© 2008 Optical Society of America

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