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Report No.
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Observation of long-wavelength electromagnetic radiation generated via intense laser matter interaction

Kando, Masaki; Nashima, Shigeki*; Pirozhkov, A. S.; Hayashi, Yukio; Kotaki, Hideyuki; Bulanov, S. V.

We irradiated laser pulses with energy of 400 mJ - 1J and the pulse duration of 30 fs onto a helium gas-jet target with the irradiance of 10$$^{19}$$ W/cm$$^2$$ and measured the long wavelength ($$sim$$ THz) electromagnetic radiation with a DTGS detector. Among the known mechanism of THz generation via laser-matter interaction, we focus on the soliton mechanism that the laser pulse depletes its energy and its energy is converted to lower frequency light. With a probe light, we observed soliton-like structures. With the DTGS, many noises were obtained when the laser intensity and laser contrast increases.

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