Abstract
We present a scheme to produce programmable phase- and amplitude-modulated femtosecond laser
pulses in the mid-infrared regime of 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
crystal with a temporally stretched idler pulse. Without changing
the mechanical alignment, we produce programmable amplitude modulations and chirped pulses at
with energy as high has thas . 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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