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题名: Effect of thermal defocusing on backward stimulated Raman scattering in CH4
作者: Xiao-qing Hua;  Jing Leng;  He-ping Yang;  Guo-he Sha;  Cun-hao Zhang
通讯作者: 沙国河
关键词: Nd : YAG laser ;  stimulated Raman scattering ;  thermal defocusing effect ;  CH4 gas
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2006-06-27
DOI: 10.1360/cjcp2006.19(3).193.4
卷: 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
原文出处: 查看原文
WOS记录号: WOS:000238867600003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/97413
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:
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.
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