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Keywords = multiple filamentation of sub-picosecond KrF laser pulse

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14 pages, 1634 KB  
Communication
Monochromatic Conical IR Emission from Decaying KrF Laser Filaments in Xenon as Coherent Stimulated Four-Wave Mixing Process
by Igor V. Smetanin, Alexey V. Shutov, Nikolay N. Ustinovskii, Vladimir D. Zvorykin, Anna V. Bogatskaya and Alexander M. Popov
Photonics 2021, 8(2), 47; https://doi.org/10.3390/photonics8020047 - 12 Feb 2021
Viewed by 2977
Abstract
We develop theoretical background for the new nonlinear optical phenomenon of narrowly directed monochromatic IR conical emission which has been recently observed when 248-nm UV filaments propagate in xenon (V. D. Zvorykin, et al., Laser Phys. Lett. 13, 125404 (2016)). We treat it [...] Read more.
We develop theoretical background for the new nonlinear optical phenomenon of narrowly directed monochromatic IR conical emission which has been recently observed when 248-nm UV filaments propagate in xenon (V. D. Zvorykin, et al., Laser Phys. Lett. 13, 125404 (2016)). We treat it as coherent stimulated four-wave mixing process in which two pump KrF laser photons are converted into the coupled pair of resonance IR(828 nm) and VUV (147 nm) photons through 5p5(2P3/2)6p[1/2]05p5(2P3/2)6s[3/2]1o and 5p5(2P3/2)6s[3/2]1o1S0 transitions. We explore the coherent interaction regime which proceeds at a time scale shorter than transverse relaxation time T2. The momentum and energy conservation laws determine the characteristic angle of conical emission. We find that the threshold of this coherent process is determined by the KrF laser pump pulse area. Full article
(This article belongs to the Special Issue Novel Nonlinear Phenomena with Strong Laser Fields)
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