A measurement of optical emission from the rear surface with solid targets irradiated by ultrashort pulse laser

作者：Wang Guang chang; Zheng Zhi jian; Yang Xiang dong^*; Gu Yu qiu; Liu Hong jie; Wen Tian shu; Ge Fang fang; Jiao Chun ye; Zhou Wei min; Zhang Shuang gen; Wang Xiang xian

来源：Spectroscopy and Spectral Analysis, 2006, 26(5): 785-789.

• optical emission
• optical transition radiation
• hot electron
• v X B acceleration mechanism
• coherent transition radiation

The integrated image spectrum and scattering light spectrum of optical emission at normal direction from rear-side of a metallic foil were measured, employing optical CCD camera and OMA optical multi-channel spectrometer. The integrated image spectrum shows that it presents a ring-shape, and in the near margin of the ring-shape a bright localized signal is shown, which is optical transition radiation (OTR) generated by hot electrons transport through solid targets. The scattering spectrum shows that it presents a series of nonperiodic sharp spikes between 300-500 nm, and the sharp spike is ascribed to the coherent transition radiation (CTR) generated by bunches of hot electron beams generated in v x B acceleration mechanism near 400 nm(2 omega). The intensity of transition radiation decreases with the increase of the target thickness.

• 出版日期2006-5
• 单位成都医学院; 中国工程物理研究院激光聚变研究中心