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Proceedings Paper

Interaction of femtosecond filaments in sapphire
Author(s): Ivan Blonskyi; Viktor Kadan; Oleh Shpotyuk; Petro Korenyuk; Ihor Pavlov
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Paper Abstract

The interaction of two femtosecond filaments has been studied in single-crystal sapphire at small crossing angles 1.2° ÷5°. Regular multifilament pattern (MFP) can be formed in the overlapping area of two beams, which depends on the pulse energy, crossing angle, and phase difference. As a special realization of MFP, formation of a single filament from two different pump beams was for the first time observed. The number of filaments in the MFP depends on the number of the interference maxima in overlapping area, whose power exceeds critical power for self-focusing. We demonstrate control of multifilament pattern, changing the phase shift between the interacting beams. Attraction and repulsion of the filaments is observed in vicinity of the overlapping region for both in- and counter-phase beams depending on the position Z along the propagation axis. Transformation of near- and far-field images of the single filament, formed by two pump beams, and spectra of its axial emission have been studied depending on the filament length. It has been shown that four-wave mixing plays a major role in forming the axial emission spectrum.

Paper Details

Date Published: 11 January 2011
PDF: 8 pages
Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931C (11 January 2011); doi: 10.1117/12.881013
Show Author Affiliations
Ivan Blonskyi, Institute of Physics (Ukraine)
Viktor Kadan, Institute of Physics (Ukraine)
Oleh Shpotyuk, Scientific Research Co. Carat (Ukraine)
Jan Dlugosz Univ. in Czestochowa (Poland)
Petro Korenyuk, Institute of Physics (Ukraine)
Ihor Pavlov, Institute of Physics (Ukraine)

Published in SPIE Proceedings Vol. 7993:
ICONO 2010: International Conference on Coherent and Nonlinear Optics
Claude Fabre; Victor Zadkov; Konstantin Drabovich, Editor(s)

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