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Optical turbulence in multiple stimulated Brillouin backscattering

Published online by Cambridge University Press:  09 March 2009

Carlos Montes  and
Jean Coste
Carlos Montes
Affiliation:
G.R.E.C.O.-C.N.R.S. ‘Interaction Laser Matière' Laboratoire de Physique de la Matière Condensée, Parc Valrose, 06034 Nice, France and Observatoire de Nice, B.P. 139, 06003 Nice, France
Jean Coste
Affiliation:
G.R.E.C.O.-C.N.R.S. ‘Interaction Laser Matière' Laboratoire de Physique de la Matière Condensée, Parc Valrose, 06034 Nice, France and Observatoire de Nice, B.P. 139, 06003 Nice, France
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Abstract

Driven stimulated Brillouin rescattering, obtained by multiline laser light, each satellite line downshifted by twice the acoustic frequency ωs, is an efficient way to reduce stimulated Brillouin reflection (Colombant et al. 1983; Montes 1985). For long enough interaction lengths the nonlinear dynamics leads to optical turbulence. We consider a six wave coherent model whose wave frequencies are ω1 and ω3 = ω1 − 2ωs for the principal and auxiliary pump waves, ω2 = ω1 − ω2 and ω4 = ω1 − 3ωs for the backscattered waves, and ωs for the forward- and backward-traveling sound waves. The sound wave is weakly damped and its velocity is neglected (limit cs/c = 0). The space-time evolution is studied numerically. The model depends upon several parameters of nonlinearity. Increasing the interaction length L we observe: (1) a stationary regime for L smaller than a critical value Lcrit; then (2) an oscillatory behaviour appears through a Hopf bifurcation at L = Lcrit which becomes (3) more and more anharmonic and (4) finally chaotic for large L.

Type
Research Article
Information
Laser and Particle Beams , Volume 5 , Issue 2 , May 1987 , pp. 405 - 411
Copyright
Copyright © Cambridge University Press 1987

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References

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