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Effect of thermal defocusing on backward stimulated Raman scattering in CH4
Xiao-qing Hua; Jing Leng; He-ping Yang; Guo-he Sha; Cun-hao Zhang; Sha GH(沙国河); Sha GH(沙国河)
关键词Nd : Yag Laser Stimulated Raman Scattering Thermal Defocusing Effect Ch4 Gas
刊名CHINESE JOURNAL OF CHEMICAL PHYSICS
2006-06-27
DOI10.1360/cjcp2006.19(3).193.4
19期:3页:193-196
收录类别SCI
文章类型Article
部门归属11
项目归属1105
产权排名1;1
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Physics, Atomic, Molecular & Chemical
研究领域[WOS]Physics
英文摘要The conversion efficiency of stimulated Raman scattering (SRS) in CH4 is studied by using a single longitudinal mode second-harmonic Nd:YAG laser (532 nm, linewidth 0.003 cm(-1), pulse-width (FWHM) 6.5 ns). Due to the heat release from vibrationally excited particles, SRS processes often suffer from the thermal defocusing effect (TDE). In view of 6.5 ns laser pulse width is much shorter than the vibrational relaxation time of CH4 molecules, TDE can only affect the SRS processes afterwards. In the cases of low laser repetition, TDE will be not serious. because it will be removed by the thermal diffusion in Raman medium before the next pulse arrives. At the laser repetition rate 2 Hz, CH4 pressure 1.1 MPa and pump laser energy 95 mJ, the quantum conversion efficiency of backward first-Stokes (BS1) has attained 73%. This represents the highest first-stokes conversion efficiency in CH4. Furthermore, due to the relaxation oscillation, the BS1 pulses are narrowed to about 1.2 ns. As a result, the BS1 peak power turns out to be 2.7 times that of the pump. Its beam quality is also much better and is only slightly affected by TDE. This reason is that BSI represents a wave-front-reversed replica of the pump beam, which can compensate the thermal distortions in Raman amplify process. Under the same conditions, but pump laser repetition rate as 10 Hz: the conversion efficiency of BS1 goes down to 36% due to TDE. From this study, we expect that a well-behaved 630 ran Raman laser may be designed by using a closed CH4/He circulating-cooling system, which may have some important applications.
语种英语
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WOS记录号WOS:000238867600003
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/97413
专题中国科学院大连化学物理研究所
通讯作者Sha GH(沙国河); Sha GH(沙国河)
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
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Xiao-qing Hua,Jing Leng,He-ping Yang,et al. Effect of thermal defocusing on backward stimulated Raman scattering in CH4[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2006,19(3):193-196.
APA Xiao-qing Hua.,Jing Leng.,He-ping Yang.,Guo-he Sha.,Cun-hao Zhang.,...&沙国河.(2006).Effect of thermal defocusing on backward stimulated Raman scattering in CH4.CHINESE JOURNAL OF CHEMICAL PHYSICS,19(3),193-196.
MLA Xiao-qing Hua,et al."Effect of thermal defocusing on backward stimulated Raman scattering in CH4".CHINESE JOURNAL OF CHEMICAL PHYSICS 19.3(2006):193-196.
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