Efficient multi-wavelength Raman conversion in methane pumped by pulsed laser at 355 nm

leng jing; sha guo-he; yang he-ping; hua xiao-qing; zhang cun-hao

Volume 17 Issue 07

Jul. 2005

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Article Navigation > High Power Laser and Particle Beams > 2005 > 17(07): 0-

wang xiao-kun, wang li-hui, zheng li-gong, et al. Application of subaperture stitching technology to test of large and steep aspherical surface[J]. High Power Laser and Particle Beams, 2007, 19.

Citation:

leng jing, sha guo-he, yang he-ping, et al. Efficient multi-wavelength Raman conversion in methane pumped by pulsed laser at 355 nm[J]. High Power Laser and Particle Beams, 2005, 17.

wang xiao-kun, wang li-hui, zheng li-gong, et al. Application of subaperture stitching technology to test of large and steep aspherical surface[J]. High Power Laser and Particle Beams, 2007, 19.

Citation:

leng jing, sha guo-he, yang he-ping, et al. Efficient multi-wavelength Raman conversion in methane pumped by pulsed laser at 355 nm[J]. High Power Laser and Particle Beams, 2005, 17.

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Efficient multi-wavelength Raman conversion in methane pumped by pulsed laser at 355 nm

1.
State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,P.O.Box 110,Dalian 116023,China

Publish Date: 2005-07-15

Abstract

Abstract

Multi-order Stokes generation in pure CH4 and its He/Ar mixture pumped by a pulsed Nd:YAG laser at 355 nm were investigated. Maximum energy conversion efficiencies as high as 71% and 38% (i.e. quantum efficiency of 79% and 48%), much higher than those reported in previous literatures, were attained under 2.5 MPa and 1 MPa for the first and second Stokes respectively. Under 0.5 MPa CH4, significant multi-wavelength outputs could be obtained with energy distribution of 3.6% at 322 nm, 24.5% at 355 nm, 24.3% at 396 nm, 22.3% at 448 nm, and 9.3% at 515 nm. High-pressure CH4 was good for highly efficient first Stokes conversion, while low-pressure CH4 was suitable for higher order Stokes generation. The experimental results were analyzed in detail in terms of cascade stimulated Raman scattering
- nd:yag laser,
- cascade stimulated raman scattering,
- four-wave fixing,
- thermal lens effect

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