title: High-power, mid-infrared, picosecond pulses generated by compression of a CO₂ laser beat-wave in GaAs.
abstract: We report on the generation of a train of ∼2  ps, 10 μm laser pulses via multiple four-wave mixing and compression of an infrared laser beat-wave propagating in the negative group velocity dispersion region of bulk GaAs and a combination of GaAs and NaCl crystals. The use of a 200 ps, 106 GHz beat-wave, produced by combining laser pulses amplified on the 10P(20) and 10P(16) transition of a CO₂ laser, provides a novel method for generating high-power, picosecond, mid-IR laser pulses at a high repetition rate. By using 165 and 882 GHz beat-waves, we show that cascaded phase-mismatched difference frequency generation plays a significant role in the four-wave mixing process in GaAs.
authors.forename: J J
authors.initials: JJ
authors.lastname: Pigeon
authors.forename: S Ya
authors.initials: SY
authors.lastname: Tochitsky
authors.forename: C
authors.initials: C
authors.lastname: Joshi