We report the preliminary results of our experiments with stimulated Raman scattering in <i>para</i>-hydrogen crystal aimed at developing a continuously tunable laboratory laser source of mid-infrared radiation. With laser pulses at 532 nm, a conversion efficiency for the first Stokes beam of as much as 20% in the forward direction was observed through a single-pass, 5-cm-long crystal. Generation of mid-infrared pulses at 4.5μm was achieved by use of the output of a near-infrared pulsed laser (1.6μm, 3 ns), and an absorption spectrum of gaseous CD<sub>4</sub> molecules was successfully recorded. These results suggest use of the solid <i>para</i>-hydrogen Raman shifter as a promising light source for mid-infrared spectroscopy.
© 2003 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(190.5890) Nonlinear optics : Scattering, stimulated
(290.5910) Scattering : Scattering, stimulated Raman
(300.6340) Spectroscopy : Spectroscopy, infrared
Mizuho Fushitani, Susumu Kuma, Yuuki Miyamoto, Hiroyuki Katsuki, Tomonari Wakabayashi, Takamasa Momose, and Andrey F. Vilesov, "Generation of infrared radiation by stimulated Raman scattering in para-hydrogen crystal at 5 K," Opt. Lett. 28, 37-39 (2003)