Probe-beam diffraction in a pulsed top-hat beam thermal lens with a mode-mismatched configuration

被引:30
作者
Li, BC [1 ]
Welsch, E [1 ]
机构
[1] Univ Jena, Inst Opt & Quantenelektron, D-07743 Jena, Germany
关键词
D O I
10.1364/AO.38.005241
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The Fresnel diffraction integral is used directly to describe the thermal lens (TL) effect with a mode-mismatched collinear configuration. The TL amplitudes obtained with Gaussian, Airy, and top-hat beam excitations are computed and compared. Numerical results for beam geometries optimized for both near- and far-field detection schemes are presented, and the analytical results developed by Bi-alkowski and Chartier [Appl. Opt. 36, 6711 (1997)] for a Gaussian beam TL effect are summarized in simplified form. Both the numerical and the analytical results demonstrate that, under a beam geometry optimized for either near- or far-field detection, the Gaussian beam TL experiment has approximately the same maximum signal amplitude as does the photothermal-interference scheme. A comparison between the optimum near- and far-field detection beam geometries indicates that a practical mode-mismatched TL instrument should be based on the far-field detection geometry. The computation results further demonstrate that the optimum beam geometry and the TL amplitude depend largely on the excitation-beam profile. The top-hat beam TL experiment is approximately twice as sensitive as the Gaussian beam TL scheme. (C) 1999 Optical Society of America. OCIS codes: 050.1940, 120.6810, 300.1030, 300.6430.
引用
收藏
页码:5241 / 5249
页数:9
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