Structure of post-filamentation zone by propagation of the 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

doi:10.1117/12.2301348

16 April 2018 Structure of post-filamentation zone by propagation of the 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

Author Affiliations +

Proceedings Volume 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII; 106140G (2018) https://doi.org/10.1117/12.2301348
Event: XIII International Conference on Atomic and Molecular Pulsed Lasers, 2017, Tomsk, Russia

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 "Structure of post-filamentation zone by propagation of the femtosecond laser pulses", Proc. SPIE 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII, 106140G (16 April 2018); https://doi.org/10.1117/12.2301348

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