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KIRILL E. KUYANOV, HIROMICHI HOSHINA AND ANDREY F. VILESOV, Department of Chemistry, University of Southern California, Los Angeles, CA 90089; TAKAMASA MOMOSE, Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 605-8502, Japan.
We have developed a pulsed continuously tunable laboratory laser source for the mid-infrared spectral range of 4.4 -- 8 µm, having a spectral line width of 0.4 cm-1. The device is based on the backward stimulated Raman scattering (SRS) of the focused near-infrared (1.56 -- 1.85 µm) laser beam in solid para -hydrogen at T = 4 K. The output energies range from 1.7 mJ at 4.4 µm to 120 µJ at 8 µm, which corresponds to SRS quantum efficiencies ranging from 0.53 to 0.17, respectively.