A radial finite model of thermal lens spectrometry and the influence of sample radius upon the validity of the radial infinite model

Conventional thermal lens models unrealistically assume that the sample has an infinite radius. Taking realistic radial sample boundary conditions into account, a cw laser-induced mode-mismatched dual-beam thermal lens model is presented. Comparison of these two kinds of models has been made, which gives the quantitatively necessary and sufficient condition for the validity of the radial-infinite treatment on the sample: The sample radius should be larger than 2.5 times both excitation beam and probe beam radii in the sample.

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