Abstract

Raman conversion is a perspective way for frequency shifting of laser radiation. For this purpose, it is attractive to use Raman conversion in barium nitrate crystals possessing a high Raman gain coefficient (47 cm/GW at 532 nm) and providing high conversion efficiencies [1]. It should be mentioned that Stokes radiation generated after single-pass SRS in barium nitrate is characterized by the high divergence (up to tens of mrad). The divergence of Stokes radiation can be reduced by using Raman lasers instead of single-pass SRS. For example, Raman laser with a plane resonator allows to obtain the output beams with the divergence of units of mrad. However, only a low mode volume can be excited in the plane resonator to maintain the low divergence. High mode volume and output energy can be provided in unstable resonators.

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