Laser radiation frequency converter based on stimulated Raman scattering in compressed hydrogen with low excitation threshold

An investigation was made of stimulated Raman scattering (STRS) conversion of laser radiation in compressed hydrogen in a capillary with an internal diameter of 140μ. Conversion of visible radiation of limited power (0.1–1 MW) to the infrared range up to 7.2μ was achieved for the first time. A study was made of the energy characteristics of the first four Stokes components of STRS in hydrogen as a function of its pressure and of the pump energy.