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Report No.

Observation of low frequency electromagnetic radiation from laser-plasmas

Kando, Masaki; Kawase, Keigo; Esirkepov, T. Z.; Daito, Izuru; Fukuda, Yuji; Kotaki, Hideyuki; Kameshima, Takashi; Pirozhkov, A. S.; Homma, Takayuki; Pikuz, S. A.*; Faenov, A. Y.; Mori, Michiaki; Bulanov, S. V.

As a result of laser-plasma interaction, an intense laser pulse can make a cavity in underdense plasma, which contains some of the energy of the laser pulse. This structure is called relativistic soliton. Solitons are predicted to store relativistic intensity of downshifted electromagnetic (EM) waves and finally emit radiation. Although a structure of solitons were observed in an experiment using proton beam imaging, however, no downshifted EM wave generation were reported, at least, recognized due to the result of soliton formation. We have tried to measure such downshifted EM radiation and observed signals which have same polarization as the pump laser at the wavelength of 5 $$mu$$m. Due to the same polarization, we attribute this radiation to the emission from solitons.



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