The Effect of Stimulated Mandelstam–Brillouin Scattering
on Angular Divergence of a Laser Beam in the Air
A. D. Bulygina, *, A. A. Zemlyanova, **, A. B. Ignat’evb, ***, and V. V. Morozovb, ****
Translated by A. Nikol’skii
aV.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia
bNPO Almaz, Moscow, 125190 Russia
Correspondence to: *e-mail: b.a.d@iao.ru
Correspondence to: **e-mail: zaa@iao.ru
Correspondence to: ***e-mail: info@raspletin.com
Correspondence to: ****e-mail: info@raspletin.com
Received 23 January, 2017
Abstract—A quasi-steady-state approximation for the problem of stimulated Mandelstam–Brillouin scattering (SMBS) in the air as in a multimode acoustic medium is formulated. In this approximation, a numerical solution of the equation for the envelope of the complex light field amplitude is implemented. Based on a series of performed numerical experiments, it is established that the SMBS effect can lead to a discernible increase in the angular divergence of laser beams during the propagation of a sufficiently powerful laser radiation with a wavelength λ = 1.315 μm in air.
Keywords: Mandelstam–Brillouin scattering, nonlinear parabolic equation
DOI: 10.1134/S1024856017050050