Stimulated Brillouin scattering of the beat wave of two lasers in a plasma

Journal Article · Tue Sep 15 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3212988· OSTI ID:21361821

Panwar, Anuraj; Sharma, A K ^[1]

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1. Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016 (India)

Stimulated Brillouin scattering of two collinear lasers in a plasma is investigated. Lasers exert a longitudinal ponderomotive force on electrons, imparting them oscillatory axial velocity at the beat frequency. This velocity acts as a driver for parametric excitation of an ion acoustic wave (omega,k-vector) and a noncollinear sideband electromagnetic wave (omega{sup '},k-vector{sup '}). The driver velocity v-vector{sub 0-} couples to the sideband wave to exert a ponderomotive force at (omega,k-vector) on the electrons, driving the ion acoustic wave. The density perturbation of ion acoustic wave beats with v-vector{sub 0-} to produce a nonlinear current at (omega{sup '},k-vector{sup '}), driving the sideband. In the case of finite spot size Gaussian laser beams, the beat wave has a Gaussian profile and excites an ion acoustic wave (omega,k-vector) and a backscattered TM mode (omega{sup '},k-vector{sub z}{sup '}). The growth rate scales as the product of amplitudes of the lasers and maximizes at optimum values of scattering angles. The parametric instability of difference frequency driver is stronger than the sum frequency driver.

• OSTI ID: 21361821
• Journal Information: Journal of Applied Physics, Vol. 106, Issue 6; Other Information: DOI: 10.1063/1.3212988; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
BRILLOUIN EFFECT
ELECTROMAGNETIC RADIATION
ELECTRONS
EXCITATION
ION ACOUSTIC WAVES
LASERS
NONLINEAR PROBLEMS
PARAMETRIC INSTABILITIES
PERTURBATION THEORY
PLASMA
PLASMA DENSITY
PONDEROMOTIVE FORCE
VECTORS
COHERENT SCATTERING
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
INSTABILITY
ION WAVES
LEPTONS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
RADIATIONS
SCATTERING
TENSORS