The effect of stimulated Brillouin scattering on the angular divergence of a laser beam in air
A.D. Bulygin1, A.A. Zemlyanov1, A.B. Ignat'ev2, V.V. Morozov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2JSC GSKB Almaz-Antey named after A.A. Raspletin, 80/16, Leningradsky av., Moscow, 125190, Russia
Keywords: рассеяние Мандельштама-Бриллюэна, нелинейное парабалическое уравнение, Brillouin-Mandelstam scattering, nonlinear parabolic equation
Abstract
Quasistationary approximation is formulated for the problem of stimulated Brillouin scattering (SBS) in air, which is considered as a multimode acoustic medium. In the approach suggested, the equation for the envelope of the complex amplitude of the light field is solved numerically. On the basis of numerical experiments, it is ascertained that when powerful laser radiation λ = 1.315 μm is propagating in air, the SBS effect can lead, at a sufficient power, to a significant increase in the angular divergence of laser beams.
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