Enhancement and modulation of terahertz radiation by multi-color laser pulses*

Project supported by the National Natural Science Foundation of China (Grant No. 11604205) and the Talent Program of Shanghai University of Engineering Science, China.
Pei Min-Jie1, Lu Chen-Hui2, †, Wang Xian-Wei3, Sun Zhen-Rong1, Zhang Shi-An1, ‡
       

(color online) THz spectra for the uncommon five-color laser pulse with the replaceable wavelength of λ5 = 1200 nm and the relative phases of ϕ5 = −π (black solid line), −0.5π (red dotted line), 0 (blue short dotted line), 0.5π (green dashed line), and π (purple dash–dotted line), with inset showing THz yield UTHz varying with relative phase ϕ5/π.