Abstract

A doubly shifted Raman laser using CH4 gas has been developed for 2.8μm generation, pumped by a Nd∶YAG laser with 65.5mJ at 17ns. A dichroically coated meniscus-type lens is modified to utilize the backward stimulated Brillouin scattering and backward Stokes beams from a previous laser design [Appl. Opt. 46, 5516–5521 (2007)]. A maximum output energy of 4.76mJ at 2.80μm wavelength has been achieved in the cascaded resonator. A maximum conversion efficiency of 8.9% has been achieved at a CH4 gas pressure of 600psi. The obtained spatial beam profile is quite smooth, and its output pulse width is 10ns.

© 2008 Optical Society of America

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