Second-harmonic generation by an obliquely incident laser on a vacuum-plasma interface
Plasma Group, Department of Physics, Indian Institute of
Technology, Hauzkhas, New Delhi, 110016, India
2 Center for Energy Studies, Indian Institute of Technology, Hauzkhas, New Delhi, 110016, India
Accepted: 15 December 1997
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, , 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.
PACS: 52.40.Nk – Laser-plasma interactions (e.g., anomalous absorption, backscattering, magnetic field generation, fast particle generation) / 52.35.Mw – Nonlinear waves and nonlinear wave propagation (including parametric effects, mode coupling, ponderomotive effects, etc.) / 52.25.Qt – Emission, absorption, and scattering of ultraviolet radiation
© EDP Sciences, 1998