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30 November 2017 Spatial and spectral characteristics of the distribution post-filamentation zone of femtosecond laser pulses
D. V. Apeksimov, A. A. Zemlyanov, A. N. Iglakova, A. M. Kabanov, O. I. Kuchinskaya, G. G. Matvienko, V. K. Oshlakov, A. V. Petrov
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Proceedings Volume 10466, 23rd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 104661A (2017) https://doi.org/10.1117/12.2286020
Event: XXIII International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2017, Irkutsk, Russian Federation
Abstract
The transverse structure formation processes of a laser beam after multiple filamentation were investigated. It is shown that the spectra of post-filamentation light channels (PFC), rings and beam differ substantially. The spectrum of PFC has a significant and symmetrical spectral broadening and covers a range of 600-1100 nm. The broadening of the spectrum of the rings is asymmetric and is directed mainly to the short-wavelength region of the spectrum. The broadening data are stable and do not change when moving away from the multiple filamentation zone. The annular structure of radiation in the cross section of the beam is formed around individual filaments within the region of multiple filamentation, and at a distance of tens of meters from it begins to form a common ring structure surrounding postfilamentation channels.
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D. V. Apeksimov, A. A. Zemlyanov, A. N. Iglakova, A. M. Kabanov, O. I. Kuchinskaya, G. G. Matvienko, V. K. Oshlakov, and A. V. Petrov "Spatial and spectral characteristics of the distribution post-filamentation zone of femtosecond laser pulses", Proc. SPIE 10466, 23rd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 104661A (30 November 2017); https://doi.org/10.1117/12.2286020
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KEYWORDS
Femtosecond phenomena
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