Comparison of experimental and simulated K alpha yield for 400 nm ultrashort pulse laser irradiation
Khattak, F. Y × du Sert, O. A. M. B. Percie Riley, D Foster, P. S Divall, E. J Hooker, C. J Langley, A. J Smith, J Gibbon, Paul #
Published by the American Physical Society through the American Institute of Physics
Physical Review E, Statistical, Nonlinear and Soft Matter Physics vol:74 issue:2
Ti K alpha emission yields from foils irradiated with similar to 45 fs, p-polarized pulses of a frequency-doubled Ti:sapphire laser are presented. A simple model invoking vacuum heating to predict absorption and hot electron temperature was coupled with the cross section for K-shell ionization of Ti and the Bethe-Bloch stopping power equation for electrons. The peak predicted K alpha emission was in generally good agreement with experiment. This contrasts strongly with previous work at the fundamental frequency. Similar predictions using particle-in-cell (PIC) code simulation to estimate the number and temperature of hot electrons also gave good agreement for yield.