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Programmable amplitude- and phase-modulated femtosecond laser pulses in the mid-infrared

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Abstract

We present a scheme to produce programmable phase- and amplitude-modulated femtosecond laser pulses in the mid-infrared regime of 310 µm by difference frequency mixing. The 80-fs signal output of an optical parametric amplifier is shaped with a liquid-crystal mask and mixed in an AgGaS2 crystal with a temporally stretched idler pulse. Without changing the mechanical alignment, we produce programmable amplitude modulations and chirped pulses at λ=3 µm with energy as high has thas 1 µJ. This scheme, further, allows the generation of controllable pulse sequences. The results are in good agreement with theoretical simulations.

© 2002 Optical Society of America

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