A. A. Ushakov, M. Matoba, N. Nemoto, N. Kanda, K. Konishi, P. A. Chizhov, N. A. Panov, D. E. Shipilo, V. V. Bukin, M. Kuwata-Gonokami, J. Yumoto, O. G. Kosareva, S. V. Garnov, A. B. Savel’ev
https://link.springer.com/article/10.1134%2FS0021364017230047
We report the first experimental observation of backward terahertz emission from the two-color laser induced plasma filament in air. The ratio of measured forward-to-backward terahertz radiation is ∼25/1. This result agrees with numerical simulations based on interferometric model assuming 0.3 mm long plasma source.
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