Explicit and approximate theories of photothermal deformation in
surface thermal lens technique |
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Authors: | H Hao B Li X Chen |
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Institution: | (1) Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Sichuan, 610209, P.R. China;(2) Graduate School of the Chinese Academy of Science, Beijing, 100039, P.R. China |
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Abstract: | An explicit thermoelastic model is developed to describe
the photothermal deformation of a coated sample excited by a cw modulated
laser beam with a top-hat profile. The surface displacement obtained with
this explicit model is compared to that obtained by an approximate model
developed by Reichling and Gr?nbeck (J. Appl. Phys. 75, 1914 (1994)).
Both thermoelastic models are then applied in a Fresnel diffraction based
surface thermal lens (STL) theory. Numerical calculations are performed to
investigate the differences between the explicit and approximate models in
both surface displacement and STL signal. The simulation results show that
the approximate model over-estimates the surface displacement and the
corresponding STL signal amplitude. A decrease in the thermal diffusion
length reduces the differences between the results obtained with the two
thermoelastic models. |
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Keywords: | |
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