Sequential terahertz pulse generation by photoionization and coherent transition radiation in underdense relativistic plasmas

J. Déchard, A. Debayle, X. Davoine +2

Terahertz (THz) emission by two-color, ultrashort optical pulses interacting with underdense helium gases at ultrahigh intensities ($>10^{19}{W/cm}^2$) is investigated by…