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In this paper the generation of K{\alpha} X-ray produced by interaction ofultrashort laser pulses with metal targets has been studied numerically.Several targets were assumed to be irradiated by high intensity ultra-shortlaser pulses for the calculations. Using Maxwell Boltzmann distributionfunction for hot electron and applying an analytical model, the number ofK{\alpha} photons were calculated as a function of hot electron temperature,target thickness and K-shell ionization cross section. Also, simulation resultsof K{\alpha} yield versus target thickness variations from two and three layermetals have been presented. These calculations are useful for optimization ofX-ray yield produced by irradiation of metal targets with high intensity laserpulses. We also generalized this model and present simulation results onK{\alpha} fluorescence measurement produced by fast electron propagation inshock compressed materials.

Numerical Study of K{\alpha} X-ray Emission from Multi-layered Cold and Compressed Targets Irradiated by Ultrashort Laser Pulses