This article is cited in 4 papers

Lattice dynamics

On the mechanism of deformation of an yttrium–aluminum garnet crystal surface under the action of a nanosecond broadband laser pulse

N. E. Bykovskii^a, E. V. Zavedeev^bc, Yu. V. Senatsky<sup>a

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^c National Engineering Physics Institute "MEPhI", Moscow

Abstract: Craters on the surface of an yttrium-aluminum garnet crystal plate under irradiation by nanosecond laser pulses with an intensity of 10$^9$–10$^{10}$ W/cm$^2$ and a wide ($\sim$ 500 $\mathring{\mathrm{A}}$) spectrum have been studied. The mechanism of crater formation as a result of plastic deformation of the surface during the laser action has been discussed. The proposed mechanism takes into account specific features of nonlinear effects under the action of a broadband radiation on the medium. In the stimulated Brillouin scattering of pumping radiation, acoustic waves transform into shock waves, on the fronts of which stimulated Raman scattering develops. As a result, crystal lattice defects formed on the shock-wave fronts are dragged in the direction of pumping, which leads to a high-rate deformation of the crystal surface.

Received: 07.07.2014
Revised: 20.10.2014

 English version: Physics of the Solid State, 2015, 57:4, 798–803

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