Abstract
A complete theoretical model is presented for the thermal mirror technique under top-hat laser excitation. Considering the attenuation of the top-hat excitation laser intensity along the thickness of a sample due to its optical absorption coefficient, we calculate the laser-induced temperature and surface deformation profiles. A simplified theoretical model for a high absorption sample is also developed. The center intensity of a probe beam reflected from the thermal mirror at a detector plane is derived. Numerical simulation shows that the thermal mirror under the top-hat laser excitation is as sensitive as that under Gaussian laser excitation. With top-hat laser excitation, the experimental results of thermo-physical properties of opaque samples are found to be well consistent with literature values, validating the theory.
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Astrath, N.G.C., Astrath, F.B.G., Shen, J. et al. Top-hat cw laser induced thermal mirror: a complete model for material characterization. Appl. Phys. B 94, 473–481 (2009). https://doi.org/10.1007/s00340-008-3310-1
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DOI: https://doi.org/10.1007/s00340-008-3310-1