Brillouin shifted third harmonic generation of a laser in a plasma

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3431402· OSTI ID:21476282

Singh, Ranjeet; Tripathi, V K ^[1]

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1. Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)

The process of Brillouin shifted resonant third harmonic generation of an intense laser of finite spot size in a plasma is investigated. The laser of frequency {omega}{sub 0} and wave number k-vector{sub 0} excites an ion acoustic wave of frequency {omega}{approx_equal}kc{sub s} and wave number k-vector{approx_equal}2k-vector{sub 0}, where c{sub s} is the ion acoustic speed, in the primary stimulated Brillouin scattering process. The laser also exerts a second harmonic ponderomotive force on electrons. This imparts them an oscillatory velocity v{sub 2{omega}{sub 0,2k{sub 0}}}. This velocity beats with the electron density perturbation associated with the ion acoustic wave to produce a density perturbation at Brillouin shifted second harmonic. This perturbation couples with the oscillatory velocity v{sub {omega}{sub 0,k{sub 0}}} due to the laser to produce Brillouin shifted third harmonic current density and the radiation field. The phase matching is satisfied when plasma density is two third critical.

• OSTI ID: 21476282
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 11; Other Information: DOI: 10.1063/1.3431402; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BRILLOUIN EFFECT
CURRENT DENSITY
DISTURBANCES
ELECTRON DENSITY
ELECTRONS
HARMONIC GENERATION
ION ACOUSTIC WAVES
IONS
LASERS
LIGHT TRANSMISSION
PLASMA
PLASMA DENSITY
PONDEROMOTIVE FORCE
VELOCITY
CHARGED PARTICLES
COHERENT SCATTERING
ELEMENTARY PARTICLES
FERMIONS
FREQUENCY MIXING
ION WAVES
LEPTONS
PLASMA WAVES
SCATTERING
TRANSMISSION