Abstract
The usual theory of the photothermal probe beam deflection, which is normally used for the thermal characterization of solids, is based on the assumption that the optical refractive index of the air surrounding the heated sample behaves linearly with the temperature. Here we study the effects of the nonlinear variation of the refractive index with higher air temperatures in front of the sample. These optothermal nonlinearities become important, when the photothermal probe beam deflection is applied at higher temperatures to analyze the effects of thermal ablation and erosion of heated surfaces. Examples of measurements in front of a heated vertical plate are presented and compared with theory.
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