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	Comparison of signals under top-hat and Gaussian beam excitations in surface thermal lens technique - art. no. 68342D
	Liu, MQ ; Li, BC ; Hao, HG
	2008
会议名称	PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
卷号	6834
页码	D8342-D8342
中文摘要	A theoretical model for the surface thermal lens (STL) signal with modulated top-hat and Gaussian beam excitations is developed. For an optical coating sample, distributions of the temperature and surface deformation in both transient and quasi-steady states are deduced, and the STL amplitudes, corresponding to the alternating current (AC) deformation and direct current (DC) deformation, respectively, are defined. Numerical simulations and comparison results for the temperature and deformation demonstrate that there exist large differences in radial distributions between the AC and DC cases especially in the high modulation frequency range. The pulsed or AC STL amplitude under the top-hat beam excitation is approximately two times of that under the Gaussian beam excitation at the optimum detection distance in the high frequency, and correspondingly, the DC STL amplitude in quasi-steady state with top-hat beam excitation is only similar to 1.1 times of that with Gaussian beam excitation at the optimum detection distance. Influences of the heating-beam radius and modulation frequency on the STL amplitudes are also presented and compared. The application of the STL technique to the deformation measurement of an optical component is discussed.
收录类别	EI
学科主题	光学薄膜技术
语种	英语
ISSN号	0361-0763
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/1856]
专题	光电技术研究所_薄膜光学技术研究室（十一室）
推荐引用方式 GB/T 7714	Liu, MQ,Li, BC,Hao, HG. Comparison of signals under top-hat and Gaussian beam excitations in surface thermal lens technique - art. no. 68342D[C]. 见:PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE).

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