18 September 1995 Femtosecond laser-produced plasma x rays from periodically modulated surface targets
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Abstract
We have studied theoretically and experimentally the x-ray production above 1 keV from femtosecond laser plasmas generated on periodically modulated surface targets. Laser energy coupling to plasma surface waves has been modeled using a numerical differential method. Almost total absorption of incident laser radiation is predicted for optimized interaction conditions. Silicon gratings have been irradiated by a 120 fs Ti: sapphire laser at irradiances in excess of 1016W/cm2. X-ray intensities above 1.5 keV (K-shell lines) have been measured as a function of the incidence angle. Results show a distinct x-ray emission maximum for the first order diffraction angle and are in good qualitative agreement with our theoretical predictions.
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Jean-Claude J. Gauthier, S. Bastiani, Patrick Audebert, Jean-Paul Geindre, K. Neuman, Tom D. Donnelly, M. Hoffer, Roger W. Falcone, Ronnie L. Shepherd, Dwight F. Price, William E. White, "Femtosecond laser-produced plasma x rays from periodically modulated surface targets", Proc. SPIE 2523, Applications of Laser Plasma Radiation II, (18 September 1995); doi: 10.1117/12.220985; https://doi.org/10.1117/12.220985
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