Year: 2006
Type: article
Abstract: A circularly polarized Gaussian laser beam propagating through a low density plasma creates a partially electron depleted channel. The laser undergoes stimulated forward Raman scattering, producing a plasma wave and two radially localized electromagnetic sideband waves. The laser and the sideband waves exert an axial ponderomotive force on electrons driving the plasma wave. The latter couples with the pump to drive the sidebands. The radial width of the electromagnetic sideband is of the order of the spot size of the pump, r 0 , whereas the radial width of the plasma wave is determined by the growth rate of the Raman process. The localization effect reduces the region of interaction and the growth rate. The algebraic equation of growth rate for forward Raman scattering is solved numerically for a typical laser wavelength and a plasma density The growth rate of the forward Raman process increases on increasing the normalized pump amplitude at lower values of pump amplitude, while the growth rate decreases on increasing at higher values of the pump amplitude. On increasing the laser spot size, maximum growth rate is obtained at higher values of a 00 . This analysis will be applicable in the study of x-ray lasers, inertial confinement fusion, and laser plasma accelerators.
Source: Physica Scripta
Authors: Vivek Sajal, Anuraj Panwar, V K Tripathi
Institution: Indian Institute of Technology Delhi
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1971835680