Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
Sci Rep. 2017 Mar 8;7:43548. doi: 10.1038/srep43548.
Proton acceleration from nanometer thin foils with intense laser pulses is investigated experimentally. We analyzed the laser absorptivity by parallel monitoring of laser transmissivity and reflectivity with different laser intensities when moving the targets along the laser axis. A direct correlation between laser absorptivity and maximum proton energy is observed. Experimental results are interpreted in analytical estimation, exhibiting a coexistence of plasma expansion and light-sail form of radiation pressure acceleration (RPA-LS) mechanisms during the entire proton acceleration process based on the measured laser absorptivity and reflectivity.
实验研究了强激光脉冲从纳米薄箔中加速质子的情况。我们通过在沿激光轴移动靶材时用不同的激光强度分别监测激光的透射率和反射率，分析了激光吸收率。观察到激光吸收率与最大质子能量之间存在直接的相关性。实验结果用分析估计进行了解释，根据测量的激光吸收率和反射率，在整个质子加速过程中，观察到等离子体膨胀和光帆形式的辐射压力加速（RPA-LS）机制共存。
