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.
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