Generation of hard x-ray from solid target irradiated by UV high intensity ultrashort pulse laser

Hard X-ray continuum generated from interaction of UV high intensity ultrashort pulse laser with solid target has been investigated by experiment. P-polarized light irradiate 5mm Cu slab with 45° ，the hard x-ray with energy of 200keV has been detected. Fitting the experiment data by Maxwellian distribution, the temperature of hot electron is 67keV. The experiment data is the results of combination of several absorption mechanisms.