Development of the 2.8 microm emission doubly shifted Raman laser using stimulated Brillouin scattering in a cascaded cavity.
A doubly shifted Raman laser using CH(4) gas has been developed for 2.8 microm generation, pumped by a Nd:YAG laser with 65.5 mJ at 17 ns. 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)APOPAI0003-693510.1364/AO.46.005516]. A maximum output energy of 4.76 mJ at 2.80 microm wavelength has been achieved in the cascaded resonator. A maximum conversion efficiency of 8.9% has been achieved at a CH(4) gas pressure of 600 psi. The obtained spatial beam profile is quite smooth, and its output pulse width is 10 ns.
Park
Young Ho
YH
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea. kmjang2@kaist.ac.kr
Lee
Dong Won
DW
Kong
Hong Jin
HJ
Kim
Yeong Sik
YS