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The expression of surface thermal lens(STL) signal is deduced from photothermal deformation theory of thin film surface and STL diffraction theory. The linearity of STL signal to absorption of thin film can be seen from the expression. A measurement apparatus for thin film absorption based on STL technique is constructed. The measuring results prove that the sensitivity and accuracy of this instrument reach 10-6 magnitude.
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Keywords:
- absorption measurement /
- surface thermal lens /
- photothermal deformation /
- thin film
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