Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation
Xue Zhan-Qiang1, Shang Li-Ping1, 2, †, Deng Hu1, Zhang Qian-Cheng1, Liu Quan-Cheng1, Qu Wei-Wei1, Li Zhan-Feng3, Wang Shun-Li1
       

(color online) Measurement systematic diagram. M1–M6 are reflector lenses, L1 is a common focusing lens, and L2 and L3 are THz focusing lenses, which have a high transmissivity around the THz wavelength.