Effect of collisional and landau damping on the saturation of (3/2)ω0 emissions from laser-produced plasmas

Abstract

Experiments were conducted to study the variation of the intensity of (3/2)ω0 emissions as a function of laser intensity from plasmas produced on planar slab targets of carbon and copper using a 20 J 5ns Nd:glass laser. At laser intensity of 1014 W/cm2, emissions from carbon plasma showed a saturation behaviour, whereas the emissions from copper plasma showed a linear one. This is explained on the basis of much higher collisional damping of plasma waves in carbon plasma than that in copper one. The approximate range of wavenumbers of excited plasma waves is also estimated.