We experimentally demonstrate amplitude and phase shaping of femtosecond mid-infrared pulses in a range centered about 14 μm . Single pulses with a tailored optical phase and phase-locked double pulses are generated by phase-matched difference-frequency mixing in a GaSe crystal of near-infrared pulses shaped with a liquid-crystal modulator. The electric field transients are directly measured by free-space electro-optic sampling, yielding pulse durations of 200–300 fs. Our data are in good agreement with a model that describes phase-matched optical rectification.
© 2000 Optical Society of America
F. Eickemeyer, R. A. Kaindl, M. Woerner, T. Elsaesser, and A. M. Weiner, "Controlled shaping of ultrafast electric field transients in the mid-infrared spectral range," Opt. Lett. 25, 1472-1474 (2000)