摘要
实验研究了超短脉冲激光辐照固体靶产生的超热电子温度 ,所用方法是测量超热电子在固体中韧致辐射产生的硬X射线 ( >30keV)能量连续谱。中等强度 ( 1 0 16W /cm2 )、无预脉冲、红外超短脉冲( 74 4nm ,1 30fs,6mJ)、P极化激光 4 5°照射 5mm铜靶 ,产生了能量为 4 0 0keV的X射线信号 ,利用Maxwellian分布拟合能谱得到的超热电子温度为 85keV ,产生高能电子的主导吸收机制为真空加热。
The temperature of hot electron generated from the solid target irradiated by ultrashort pulse laser has been studied experimentally. The method is to measure the hard X-ray continuum generated by the high energy electron bremsstrahlung process in solid region. When moderate intensity, pre-pulse free, P-polarized light irradiates 5 mm Cu slab with 45°, the hard X-ray with energy up to 400 keV is detected. Fitting the experiment data by Maxwellian distribution, the temperature of hot electron is 85 keV, the main absorption mechanism for high energy electron generation is 'vacuum heating'.
出处
《原子能科学技术》
EI
CAS
CSCD
2002年第6期481-485,共5页
Atomic Energy Science and Technology
基金
国家"8 6 3"惯性约束聚变领域资助课题 (86 3 80 4 0 6 0 1
86 3青 2 0 0 0 0 4)
