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| VOLUME 106 (2017) | ISSUE 11 | PAGE 675 |
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Backward terahertz radiation from the two-color femtosecond laser filament
A. A. Ushakova,b,c,d, M. Matobad, N. Nemotod, N. Kandae,f, K. Konishig, P. A. Chizhova, N. A. Panovb,c, D. E. Shipilob,c, V. V. Bukina, M. Kuwata-Gonokamid, J. Yumotod,g, O. G. Kosarevab,c, S. V. Garnova,h, A. B. Savel'evb,c
aA.M. Prokhorov General Physics Institute RAS, 119991 Moscow, Russia bPhysics Faculty, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia cInternational Laser Center of M.V. Lomonosov Moscow State University, 119991 Moscow, Russia dDepartment of Physics, The University of Tokyo, 113-8654 Tokyo, Japan eRIKEN Center for Advanced Photonics, RIKEN, 351-0198 Tokyo, Japan fPhoton Science Center, The University of Tokyo, 113-8654 Tokyo, Japan gInstitute for Photon Science and Technology, The University of Tokyo, 113-8654 Tokyo, Japan hNational Research Nuclear University MEPhI, 115409 Moscow, Russia
Abstract
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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