Enhancing the energy of terahertz radiation from plasma produced by intense femtosecond laser pulses

Jahangiri, Fazel; Hashida, Masaki; Tokita, Shigeki; Nagashima, Takeshi; Hangyo, Masanori; Sakabe, Shuji
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p191106
Academic Journal
Terahertz (THz) radiation from atomic clusters illuminated by intense femtosecond laser pulses is investigated. By studying the angular distribution, polarization properties and energy dependence of THz waves, we aim to obtain a proper understanding of the mechanism of THz generation. The properties of THz waves measured in this study differ from those predicted by previously proposed mechanisms. To interpret these properties qualitatively, we propose that the radiation is generated by time-varying quadrupoles, which are produced by the ponderomotive force of the laser pulse.


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