Two-plasmon decay of self-trapped laser radiation in a plasma

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · IEEE Trans. Plasma Sci.; (United States)

DOI:https://doi.org/10.1109/TPS.1987.4316699· OSTI ID:6312004

Sharma, A K; Tripathi, V K

A Gaussian laser beam propagating through a plasma exerts a traverse ponderomotive force on the electrons and creates a density depletion near the axis of the beam. This self-generated plasma channel supports localized Langmuir eigenmodes. The laser pump can parametrically excite two localized Langmuir waves, at reasonably low powers as the convective losses for the decay are minimal. A pertubation approach is employed to investigate the growth rate and the threshold for the decay process. The growth rate increases with the azimuthal mode number, tending to a maximum around m -- k/sub z/ (..omega../sub rho//O/..nu../sub th/L/sub n/)/sup 1/2/. However, it decreases with the radial mode number.

• Research Organization: Dept. of Physics, Indian Institute of Technology, New Delhi 110 016
• OSTI ID: 6312004
• Journal Information: IEEE Trans. Plasma Sci.; (United States), Vol. PS-15:3
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
WAVE PROPAGATION
PLASMA WAVES
EXCITATION
OPTICAL PUMPING
DECAY
ELECTRONS
GAUSSIAN PROCESSES
HEAT LOSSES
LASER RADIATION
PERTURBATION THEORY
PLASMA DENSITY
PLASMONS
PUMPS
THRESHOLD CURRENT
TRANSVERSE MOMENTUM
TRAPPING
CURRENTS
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
FERMIONS
LEPTONS
LINEAR MOMENTUM
LOSSES
PUMPING
QUASI PARTICLES
RADIATIONS
700108* - Fusion Energy- Plasma Research- Wave Phenomena