Portraying polarization state of terahertz pulse generated by a two-color laser field in air.
By using an electro-optic sampling technique, the instantaneous field vector of the terahertz (THz) pulse generated by mixing a near-IR femtosecond pulse and its second harmonic in air has been studied. The polarization of the investigated THz pulse is found to be predominantly linear and orthogonal to that of the second harmonic, revealing the major role of chi((3))(xyxy) during the four-wave mixing process.
Zhang
Yizhu
Y
Institute of Modern Optics, Nankai University, Key Laboratory of Opto-electronic Information Science andTechnology, Education Ministry of China, Tianjin 300071, China.
Chen
Yanping
Y
Xu
Shengqi
S
Lian
Hui
H
Wang
Mingwei
M
Liu
Weiwei
W
Chin
See Leang
SL
Mu
Guoguang
G