Second harmonic generation of q-Gaussian laser beam in preformed collisional plasma channel with nonlinear absorption
- Department of Physics, National Institute of Technology Jalandhar (India)
- Guru Nanak Dev University College, Kapurthala, Punjab (India)
This paper presents a scheme for second harmonic generation of an intense q-Gaussian laser beam in a preformed parabolic plasma channel, where collisional nonlinearity is operative with nonlinear absorption. Due to nonuniform irradiance of intensity along the wavefront of the laser beam, nonuniform Ohmic heating of plasma electrons takes place. Due to this nonuniform heating of plasma, the laser beam gets self-focused and produces strong density gradients in the transverse direction. The generated density gradients excite an electron plasma wave at pump frequency that interacts with the pump beam to produce its second harmonics. The formulation is based on a numerical solution of the nonlinear Schrodinger wave equation in WKB approximation followed by moment theory approach. A second order nonlinear differential equation governing the propagation dynamics of the laser beam with distance of propagation has been obtained and is solved numerically by Runge Kutta fourth order technique. The effect of nonlinear absorption on self-focusing of the laser beam and conversion efficiency of its second harmonics has been investigated.
- OSTI ID:
- 22489862
- Journal Information:
- Physics of Plasmas, Vol. 22, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
COLLISIONAL PLASMA
ELECTRON PLASMA WAVES
FOCUSING
HARMONIC GENERATION
HARMONICS
JOULE HEATING
LASER RADIATION
NONLINEAR PROBLEMS
PHOTON BEAMS
RADIANT FLUX DENSITY
RUNGE-KUTTA METHOD
SCHROEDINGER EQUATION
WKB APPROXIMATION