对超短超强脉冲激光与固体薄膜靶相互作用产生的超热电子的空间分布和能谱特性进行了研究.结果表明,超热电子的角分布和能谱均表现出各向异性.分析认为这主要与超热电子产生的机制有关.能谱的各向异性解释了目前各研究小组在相同的激光功率密度下,得到的超热电子温度却有很大差别的现象.
The angular distribution and energy spectrum of hot electrons produced in the interaction of ultra-short ultra-intense laser pulses with solid foil targets are investigated. Results show that bath the angular distribution and the energy spectrum reveal anisotropic behavior. This anisotropy is believed to be related to the electron generation mechanism. The existence of energy anisotropy explains why different experimental groups obtained quite different elctron temperatures under the same laser intensity.