Chun Li, Guo-Qian Liao, Mu-Lin Zhou, Fei Du, Jing-Long Ma, Yu-Tong Li, Wei-Min Wang, Zheng-Ming Sheng, Li-Ming Chen, and Jie Zhang
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-4-4010
We report a systematic study on backward terahertz (THz) radiation generation from laser-solid interactions by changing a variety of laser/plasma parameters. We demonstrate a high-energy (with an energy flux density reaching 80 μJ/sr), broadband (>10 THz) plasma-based radiation source. The radiation energy is mainly distributed either in the >10 THz or <3 THz regions. A radial surface current formed by the lateral transport of low-energy electrons (LEE) is believed to be responsible for the radiation in the high-THz region (>10 THz), while high-energy surface fast electrons (SFE) accelerated along the target surface mainly contribute to lower frequency (<3 THz) radiation. The unifying explanation could be applied to backward THz radiation generation from solid targets with presence of relative small preplasmas.
© 2016 Optical Society of America
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