在100 TW超短脉冲钛宝石激光装置上完成了飞秒激光-固体靶相互作用中超热电子的产生及输运特性的实验研究。获得了超热电子的能谱、产额、注量和总能量。结果表明,随着功率密度的增加,靶前法线方向的超热电子更容易产生;超热电子的注量和总能量随靶厚度的增加而减少。超热电子约80%的能量主要沉积在靶内的前10 μm,分析表明,这主要是静电场的影响所致。

Hot electron generation and its transport characteristics in the interaction of femtosecond laser with solid target were studied in experiments, on the 100 TW ultrashort Ti:sapphire laser. The energy spectrum, yield, fluence and total energy of hot electrons were obtained. It shows that more hot electrons are generated at the rear normal direction of target with the increase of power density of laser, and the fluence and total energy of hot electrons decrease with the increase of target thickness. 80% hot electrons energy deposits in the place in front of the target about 10 μm, which is induced by the static electric field effect.