超短脉冲激光与乙醇微滴相互作用中超热电子的双叶状角分布

Angular distribution of hot electrons emitted from ethanol droplets irradiated by ultrashort laser pulses

测量了聚焦光强为 1 0 1 6 W cm2 的超短脉冲激光与乙醇微滴相互作用中产生的能量大于 5 0keV的超热电子的角分布和电子能谱 .观察到的超热电子角分布明显依赖于激光的偏振特性 ,在与激光偏振平面平行的平面上超热电子相对于激光入射方向呈对称的双叶状分布 .超热电子的能谱显示超热电子的最大能量大于 75 0keV .

The angular distribution and the energy spectrum of hot electrons with energy over 50?keV emitted from ethanol droplets irradiated by linearly polarized 150 fs laser pulses at the intensity of 10 16 ?W/cm 2 have been measured. The angular distribution of hot electrons is found to be dependent on the laser polarization. Two hot electron jets like double leaves symmetrically with respect to the laser propagation direction are observed within the polarization plane. The maximum energy of the hot electrons is found to be more than 750 keV. A model based on the resonance absorption can be used to interpret the above distribution. The calculation agrees well with the experimental results.