Influence of 3-D Effects on the Contrast in Photothermal Imaging
It has been demonstrated both experimentally and theoretically that thermal wave imaging is a very efficient quantitative tool for subsurface defect characterization. For instance, at less than one thermal diffusion length, defects equivalent to a 0.1 micron thick air slice are easily observed when using extended uniform excitation. Nevertheless, to achieve a good spatial resolution, the excitation beam is often focused on the surface.
KeywordsThermal Diffusivity Pump Beam Finite Thickness Mirage Effect Excitation Beam
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