Stimulated Brillouin scattering of the beat wave of two lasers in a plasma
- 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, Journal Name: Journal of Applied Physics Journal Issue: 6 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
BRILLOUIN EFFECT
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
INSTABILITY
ION ACOUSTIC WAVES
ION WAVES
LASERS
LEPTONS
NONLINEAR PROBLEMS
PARAMETRIC INSTABILITIES
PERTURBATION THEORY
PLASMA
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
PONDEROMOTIVE FORCE
RADIATIONS
SCATTERING
TENSORS
VECTORS