G. E. Rizaev, Ya. V. Grudtsyn, A. A. Ionin, O. G. Kosareva, A. V. Koribut;, Yu. A. Mityagin, D. V. Mokrousova, N. A. Panov, S. A. Savinov, L. V. Seleznev, D. E. Shipilo,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11322/113222D/Comparison-of-terahertz-radiation-spectra-emitted-from-single-color-IR/10.1117/12.2543372.short
Emission of THz radiation from a single-color
ultraviolet (248 nm) and infrared (744 nm) filament in air is studied
experimentally and compared at similar pulse durations, focusing conditions and
excess of peak pulse power over the critical power for self-focusing. An
angular distribution of the terahertz emission for both ultraviolet and
infrared pump is conical with the closed cone angle. In contrast, the terahertz
radiation energy and spectrum differ significantly. The energy of terahertz
emission from ultraviolet filament is 1-2 orders of magnitude lower than the
terahertz yield from the infrared filament. The terahertz spectrum of
ultraviolet filament is shifted to the low-frequency range and narrower as
compared to the spectrum of terahertz emission from infrared filament. We
explain qualitatively the difference in terahertz yields and spectra by lower
intensity and plasma density in the ultraviolet filament. Similar behavior of
THz spectra is observed when changing the IR filament parameters.
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