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The interaction of femtosecond laser pulses with solid targets was studied through ex-periments and particle-in-cell(PIC)simulations.It is proved that the vacuum heating and the in-verse bremsstralung process are the main mechanisms of the laser pulse absorption under suchconditions.The distribution of hot electrons and that of X-ray are found to have dou-ble-temperature structure,which is confirmed by PIC simulations.While the lower temperature isattributed to the resonant absorption,the higher one,however,is caused by the laser-inducedelectric field in the target normal direction.The time-integrated spectra of the reflected laser pulseshows that the mechanism of electron acceleration is determined by the plasma density profile.
The interaction of femtosecond laser pulses with solid targets was studied through ex-periments and particle-in-cell (PIC) simulations. It is proved that the vacuum heating and the in-verse bremsstralung process are the main mechanisms of the laser pulse absorption under suchconditions.The distribution of hot electrons and that of X-ray are found to have dou-ble-temperature structure, which is confirmed by PIC simulations. Whilst the lower temperature isattributed to the resonant absorption, the higher one, however, is caused by the laser-induce electrical field in the target normal direction. The time-integrated spectra of the reflected laser pulses that the mechanism of electron acceleration is determined by the plasma density profile.