[A measurement of optical emission from the rear surface with solid targets irradiated by ultrashort pulse laser].
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.
Wang
Guang-Chang
GC
Teaching and Research Section of Physics, Chengdu Medical College, Chengdu 610081, China.
Zheng
Zhi-Jian
ZJ
Yang
Xiang-Dong
XD
Gu
Yu-Qiu
YQ
Liu
Hong-Jie
HJ
Wen
Tian-Shu
TS
Ge
Fang-Fang
FF
Jiao
Chun-Ye
CY
Zhou
Wei-Min
WM
Zhang
Shuang-Gen
SG
Wang
Xiang-Xian
XX