Second-harmonic generation by an obliquely incident laser on a vacuum-plasma interface

Abstract

A high-power laser obliquely incident on a plasma produces a second-harmonic radiation in the reflected component. The second-harmonic reflected power P2 vanishes at normal and grazing incidence. P2 has a maximum, P2m, at an optimum value of the angle of incidence, θop, that depends on electron density. The harmonic generation occurs from subcritical to overcritical values of the electron density. P2m increases monotonically with electron density, attains a maximum around critical density then falls off at higher densities.

Efficient second- and third-harmonic radiation generation from relativistic laser-plasma interactions

“…Substituting for A 2 in Eq. (12), multiplying the resulting equation by F 2 Ã rdr, and integrating over r from 0 to 1, we get…”

“…A plasma as a source of coherent light at very high photon energy has recently motivated several theoretical works concerning the interaction of very intense lasers with plasmas. 12,13 Harmonic generation of an intense laser radiation in a plasma is an important nonlinear process. The new laser technology based on chirped-pulse amplification in solid-state amplifiers followed by temporal compression made possible the production of compact intense terawatt lasers.…”

Enhanced resonant second harmonic generation in plasma based on density transition

“…lisionless plasma, the nonlinearity in the dielectric constant is due to relativistic mass increase and ponderomotive force, and the nonlinear part of dielectric constant is given by (4) .…”

“…harmonic generation, frequency up-conversion, signal processing, etc. [1][2][3][4][5]. Harmonic generation during high power laser interaction with plasmas is observed under different conditions [6,7].…”

Second harmonic generation by propagation of a p-polarized obliquely incident laser beam in underdense plasma

“…Generation of second harmonic radiation in the reflected component by laser beams obliquely incident on an underdense plasma has been reported. 20,21 Second harmonic emission by spatially asymmetric quivering electrons caused by the ponderomotive force has been experimentally observed. 22 The aim of the present work is to take up an analytical study of second harmonic generation by a p-polarized laser beam obliquely incident on a vacuum-homogeneous, plasma interface.…”