| 光学薄膜测量时平顶光束激励的表面热透镜理论模型 |
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| 引用本文： | 陈潇潇,李斌成,杨亚培.光学薄膜测量时平顶光束激励的表面热透镜理论模型[J].物理学报,2006,55(9):4673-4678. |
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| 作者姓名： | 陈潇潇 李斌成 杨亚培 |
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| 作者单位： | (1)电子科技大学光电信息学院，成都 610054; (2)电子科技大学光电信息学院，成都 610054;中国科学院光电技术研究所，成都 610209; (3)中国科学院光电技术研究所，成都 610209 |
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| 摘 要： | 推导了调制的平顶光束激励下基于Fresnel衍射积分的表面热透镜理论，通过数值模拟，比较了平顶光束和高斯光束激励下样品内部温度场、表面形变场和探测光衍射信号的径向分布，分析了影响表面热透镜信号的实验参数.结果表明，在最佳探测位置，平顶光束激励下的表面热透镜系统比相同情况下高斯光束激励下的灵敏度高，最高时约2倍，更有利于薄膜吸收测量.
关键词：
表面热透镜
光学薄膜
平顶光束
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| 关 键 词： | 表面热透镜 光学薄膜 平顶光束 |
| 文章编号： | 1000-3290/2006/55(09)/4673-06 |
| 收稿时间： | 12 26 2005 12:00AM |
| 修稿时间： | 2005-12-262006-02-10 |
Theory of surface thermal lens signal in optical coating with cw modulated top-hat beam excitation |
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| Chen Xiao-Xiao,Li Bin-Cheng,Yang Ya-Pei.Theory of surface thermal lens signal in optical coating with cw modulated top-hat beam excitation[J].Acta Physica Sinica,2006,55(9):4673-4678. |
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| Authors: | Chen Xiao-Xiao Li Bin-Cheng Yang Ya-Pei |
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| Institution: | 1 Optoelectronic Information Department of the University of Electric Science and Technology of China, Chengdu 610054, China; 2 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China |
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| Abstract: | The theoretical model based on the Fresnel diffraction integral is developed to describe the surface thermal lens (STL) signal excited by a cw modulated top-hat beam. The three-dimensional profile of temperature rise,the radial profile of the surface displacement and the diffraction signal of the probe beam obtained with both top-hat and Gaussian beam excitations are compared by numerical calculation. The dependence of the surface thermal lens amplitude on the experimental parameters are discussed. Numerical results show that the top-hat beam STL instrument is more sensitive than the Gaussian beam STL instrument,with a maximum sensitivity enhancement factor of approximately 2. |
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| Keywords: | surface thermal lens optical coating top-hat beam |
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