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题名:
Fresnel diffraction model for mode-mismatched thermal lens with top-hat beam excitation
作者: Li, B; Xiong, S; Zhang, Y
刊名: APPLIED PHYSICS B-LASERS AND OPTICS
出版日期: 2005-04-01
卷号: 80, 期号:4-5, 页码:527-534
文章类型: Article
英文摘要: A theoretical model, based on the Fresnel diffraction integral, is developed to describe the thermal lens (TL) signal in a mode-mismatched collinear configuration, which is optimized for a near field detection scheme and excitation by a cw modulated laser beam with a top-hat profile. The TL amplitudes obtained with both top-hat and Gaussian beam excitations are numerically computed and compared, and the dependence of the TL amplitude on the experimental parameters is discussed. Numerical results show that the top-hat beam TL instrument is more sensitive than the Gaussian beam TL instrument, with a potential doubling of the sensitivity. The use of the top-hat beam excitation with TL detection is a significant improvement because a top-hat beam can be easily obtained with a low-cost, wide-spectral emission white-light source. The use of incoherent light sources as the excitation sources would substantially expand the applicability of the TL technique to the general area of chemical analysis.
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]: SPECTROMETRY ; LASER ; SAMPLES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000228254400021
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/3521
Appears in Collections:光电技术研究所被WoS收录文章_期刊论文

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作者单位: Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Sichuan, Peoples R China

Recommended Citation:
Li, B,Xiong, S,Zhang, Y. Fresnel diffraction model for mode-mismatched thermal lens with top-hat beam excitation[J]. APPLIED PHYSICS B-LASERS AND OPTICS,2005,80(4-5):527-534.
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