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Article Dans Une Revue Applied optics Année : 2018

Generation of coherent acoustic beams in solids by mixing of counterpropagating, detuned optical beams

Résumé

We model the generation of coherent acoustic beams in a homogeneous solid from the interference of two oppositely propagating, detuned optical laser beams. This configuration is reciprocal to Brillouin light scattering in the backward interaction arrangement. Generation of a confined ultrasound beam is predicted, close to the Brillouin frequency. Optoacoustic gain spectra and beam shapes are obtained numerically using a finite element model. The acoustic spectra are non-symmetrical, i.e., non-Lorentzian, and result from excitation of the continuum of bulk elastic waves. The acoustic beam width correspondingly varies with detuning frequency and optical beam waist.
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Dates et versions

hal-02131447 , version 1 (16-05-2019)

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Vincent Laude, Maria Korotyaeva, Jean-Charles Beugnot. Generation of coherent acoustic beams in solids by mixing of counterpropagating, detuned optical beams. Applied optics, 2018, 57 (10), pp.C77-C82. ⟨10.1364/AO.57.000C77⟩. ⟨hal-02131447⟩
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