Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser

	Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser
	Hua, X; Leng, J; Yang, H; Sha, G; Zhang, C
刊名	applied physics b-lasers and optics
	2005-08-01
卷号	81 期号:4 页码:525-530
英文摘要	the first-stokes conversion efficiency for a stimulated raman scattering (srs) is usually very low in gaseous oxygen media. in 3.0 mpa o-2, a single longitudinal mode second harmonic nd:yag laser pump source gives a typical vibrational first-stokes conversion efficiency of only 2.5%, in comparison, the accompanying stimulated brillouin scattering (sbs) attains a reflectivity of 67%. however, by seeding an opo beam into the raman cavity, the first-stokes photon conversion efficiency now attains a peak value of 54%, while the sbs reflectivity reduces to 5% in a 6.1 mpa 41:59 o-2/ he mixture. this 54% efficiency was obtained for a seeder laser pulse-width less than one half that of pump laser (6.8 ns). a first-stokes peak power conversion efficiency as high as 88% has been obtained when the pump and seeder pulse peaks coincide. so, we may expect a higher first-stokes photon conversion efficiency if the seeder pulse-width can be made equal to or larger than that of the pump pulse. on the other hand, the beam quality of the first-stokes in an o-2/ he mixture excels that of the pump laser for a seeder energy of 5 mj and pump energy of 50 mj. however, at pump energies higher than 105 mj and a pump laser repetition rate of 10 hz, the thermal defocusing effect worsens the first-stokes beam quality. this thermal defocusing effect is a result of the raman heat release and could be eliminated by fast circulating and cooling the raman gas medium.
WOS标题词	science & technology ; physical sciences
类目[WOS]	optics ; physics, applied
研究领域[WOS]	optics ; physics
关键词[WOS]	stimulated brillouin-scattering ; radiation ; oxygen ; gain
收录类别	SCI
语种	英语
WOS记录号	WOS:000231460800015
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/139626]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Hua, X,Leng, J,Yang, H,et al. Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser[J]. applied physics b-lasers and optics,2005,81(4):525-530.
APA	Hua, X,Leng, J,Yang, H,Sha, G,&Zhang, C.(2005).Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser.applied physics b-lasers and optics,81(4),525-530.
MLA	Hua, X,et al."Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser".applied physics b-lasers and optics 81.4(2005):525-530.