超短超强激光与不同厚度的铝膜作用加速质子的实验研究

Experimental Research of Fast Proton Generated From Ultrashort Intense Laser Pulses Interaction With Different Thickness Al Foils

摘要: 介绍了功率密度4×10¹⁶W/cm²，脉宽120 fs情况下超短超强激光分别与5和2.1 μm薄膜铝靶作用加速质子的实验。采用CR-39固体径迹探测器和Thomson谱仪结合测量得到质子能谱，并对实验结果进行分析。测得的5 μm铝靶的质子最大能量约为140 keV，2.1 μm铝靶的质子最大能量约为170 keV。2.1 μm铝靶的质子产额较5 μm铝靶的高1个量级。

Abstract: The results of the generation of fast protons from 5 μm and 2.1 μm aluminum foils by 120 fs laser irradiation at 4×10¹⁶ W/cm² were presented. A Thomson spectrometer and CR-39 solid track detector were used to measure proton energy spectra. The maximum proton energy is 140 keV for 5 μm aluminum foil, and is 170 keV for 2.1 μm aluminum foil. The proton yield of 2.1 μm aluminum foil is higher than that of 5 μm aluminum foil for one order of magnitude.