Abstract
The thermooptical excitation of sound by Bessel light beams in crystalline media with internal stress has been studied. The dependence of the thermoelastic coupling coefficient, which is due to the modulated absorption of laser radiation, on the initial strain in a crystalline sample is taken into account. The expression for the photoacoustic signal amplitude is obtained, and it is shown that, in the range of high modulation frequencies of TE modes of Bessel light beams, resonant phenomena occur which can be used to increase the resolution of laser photoacoustic diagnostics of elastically strained crystals.
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Original Russian Text © G.S. Mityurich, A.N. Serdyukov, 2011, published in Kristallografiya, 2011, Vol. 56, No. 3, pp. 392–397.
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Mityurich, G.S., Serdyukov, A.N. Thermooptical excitation of sound by Bessel light beams in crystalline media with internal stress. Crystallogr. Rep. 56, 360–365 (2011). https://doi.org/10.1134/S1063774511030175
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DOI: https://doi.org/10.1134/S1063774511030175