Investigation Of Plasma Critical Surface Rippling By Harmonics Generation In Laser Plasmas

Rácz, E.; Földes, I. B.; Szatmári, S.
January 2006
AIP Conference Proceedings;2006, Vol. 812 Issue 1, p291
Academic Journal
Experiments were carried out by a tightly focused, prepulse-free hybrid KrF excimer-dye laser system (700fs pulse duration, 248nm wavelength, 15mJ pulse energy). Intense 2ω, 3ω and near threshold 4ω were generated in laser plasmas on solid surfaces for p- and s-polarized 1.5·1017 W/cm2 radiation intensity. Directionality and polarization properties were investigated depending on the laser intensity and polarization. The observations showed diffuse propagation of harmonics for intensities above 1016 W/cm2 and the polarization of harmonics was mixed for the highest intensities. The explanation of these results is surface rippling of the plasma critical surface because of the Rayleigh-Taylor instability, which is an intrinsic consequence of the unstable balance between light pressure and plasma expansion. © 2006 American Institute of Physics


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