摘要
The effects of laser polarization on super-hot electron (> 100 keV) generation have been studied in the interaction of femtosecond laser light (800 nm, 150 fs, 6 × 10^(15) W·cm^(-2)) with a pre-formed plasma from a slab Cu target. For p-polarized laser pulses, high-energy γ-rays of the energy ~400keV were detected. The electron temperatures deduced from the γ-ray spectra were 66 and 52keV, respectively, in normal and reflective directions of the solid target, and hot electrons were emitted out of the plasma mainly in the normal direction. In contrast, there were nearly no γ-rays >100keV found for s-polarized laser pulses. The hot electron temperature was 26keV and the emission of hot electrons was parallel to the laser field. The superposition of resonant field with electrostatic field excited by escaping electrons may contribute to the high-energy γ-ray or super-hot electron (> 100 keV) generation.
作者
张平
梁天骄
陈黎明
李玉同
陈端保
李祖豪
何景堂
魏志义
王龙
唐孝威
张杰
ZHANG Ping;LIANG Tian-Jiao;CHEN Li-Ming;LI Yu-Tong;CHEN Duan-Bao;LI Zu-Hao;HE Jing-Tang;WEI Zhi-yi;WANG Long;TANG Xiao-wei;ZHANG Jie(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039;Laboratory of Optical Physics:Institute of Physics,Chinese Academy of Sciences,Beijing 100080;Institute of Physics,Chinese Academy of Sciences,Beijing 100080)
基金
Supported by the National Natural Science Foundation of China under Grant Nos.19854001,10005014 and 19825110
the National Hi-Tech ICF Programme。