T. Fukuda, T. P. Otsuka, T. Kobayashi, T. Asai, Y. Yoshida, K. Yamamoto, T. Nagami, H. Yamanaka, S. Endo, N. Yugami
https://iopscience.iop.org/article/10.7567/1347-4065/ab2c31/pdf
We investigated the terahertz radiation from laser-created plasma in the presence of an external electric field parallel to the laser direction in the frequency range 0.14 to 0.33 THz. A narrow cone radiation pattern was observed by measuring the angular distribution, and polarizations were quasi-radial polarization. The terahertz intensities depended on the square of the electric field in the range 2 to 5 kV cm−1.
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