Picosecond terahertz pump–probe realized from Chinese terahertz free-electron laser
Wang Chao1, 2, Xu Wen1, 3, †, Mei Hong-Ying4, 1, Qin Hua5, Zhao Xin-Nian1, 2, Wen Hua1, 2, Zhang Chao1, Ding Lan3, Xu Yong6, Li Peng6, Wu Dai6, Li Ming6
       

Schematic diagram of ps THz pump–probe system based on CTFEL.