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题名: Highly efficient Raman conversion in O-2 pumped by a seeded narrow band second-harmonic Nd : YAG laser
作者: Hua, X;  Leng, J;  Yang, H;  Sha, G;  Zhang, C
刊名: APPLIED PHYSICS B-LASERS AND OPTICS
发表日期: 2005-08-01
DOI: 10.1007/s00340-005-1927-x
卷: 81, 期:4, 页:525-530
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Optics ;  Physics, Applied
研究领域[WOS]: Optics ;  Physics
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.
关键词[WOS]: STIMULATED BRILLOUIN-SCATTERING ;  RADIATION ;  OXYGEN ;  GAIN
语种: 英语
WOS记录号: WOS:000231460800015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139626
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
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.
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