Abstract-Directional linearly polarized terahertz emission from argon clusters irradiated by noncollinear double-pulse beams

 Kazuaki Mori, Masaki  Hashida, Takeshi  Nagashima, Dazhi Li, Kensuke Teramoto, Yoshihide Nakamiya, Shunsuke Inoue, Shuji Sakabe,

http://aip.scitation.org/doi/abs/10.1063/1.4991736

It has been demonstrated that the interaction between argon clusters and intense femtosecond double laser pulses with appropriate intervals in time and space provides important properties for terahertz electromagnetic wave generation, namely, high forward directivity, power enhancement, and linear polarization with a variable direction. Irradiating argon clusters with double pulses (1 and 3 mJ, 40 fs, 810 nm) in 133-ps and 40-μm intervals results in terahertz wave emission in the forward direction that is 10 times greater than that for a single pulse. The polarization direction of terahertz electromagnetic waves can be varied by changing the relative focal positions of the first and second pulses.