Characteristic of hot electron transport in femtosecond laser interaction with solid targets

Hot electron spectrum in the interaction of femtosecond laser with solid target was measured by experiment on the 100 TW laser. The energy spectrum, yield, fluence and energy deposit range of hot electron transport in target were obtained. It is shown that the fluence and total energy of hot electrons decreases with the increase of target thickness, 80％ hot electrons energy deposits in the place infront of the target about pulse width of femtosecond laser, and energy deposit range of hot electrons increases with the increase of pulse width of femtosecond laser, which is induced by the static electric field effect.