Terahertz generation from single and multiple filaments in airстатья

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Дата последнего поиска статьи во внешних источниках: 10 апреля 2019 г.

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[1] Terahertz generation from single and multiple filaments in air / O. Kosareva, N. Panov, D. Shipilo et al. // EPJ Web of Conferences. — 2018. — Vol. 195. — P. 03013. In this paper we present a series of studies for the control and optimization of THz directionality, polarization and energy yield. We observe linear-to-elliptical transformation of THz radiation through independent control of initially linear polarization directions of ω and 2ω beams. Strongly elliptical THz radiation appears abruptly at the threshold angle of ∼85o between the ω and 2ω light fields. The physical reason for THz beam ellipticity was identified by us as the nonlinear response of the birefringent medium induced by an 800 nm pump. We found THz ellipticity and energy yield using a vectorial nonparaxial propagation equation We have demonstrated and justified the mechanism which dictates the optimum chirp to maximize the THz yield from a two-color filament. We have experimentally measured the THz energy yield using 800-nm pulses in a single filament regime, being chirped from 35 fs up to 250 fs. [ DOI ]

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