Fusion of regularized femtosecond filaments in air: far field on-axis emission. (13th October 2016)

• Record Type: Journal Article
• Authors: Shipilo, D E; Panov, N A; Sunchugasheva, E S; Mokrousova, D V; Andreeva, V A; Kosareva, O G; Seleznev, L V; Savel'ev, A B; Ionin, A A; Chin, S L
• Is Part Of: Laser physics letters. Volume 13:Number 11(2016:Nov.)
• Publication Date: 2016-10-13
• Subjects: femtosecond pulse -- plasma channel -- beam control; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-2011/13/11/116005
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: The fusion of several coherent 800 nm femtosecond filaments is induced experimentally and numerically by transmitting a beam through a mask with circular apertures followed by the focusing lens. The far-field image of the four-filament fusion region reveals bright on-axis maximum and differs drastically from the diffraction pattern of a low energy beam propagating through the mask in the linear regime. In 3 D +time numerical simulations with the carrier wave resolved we show a factor-of-5 saturable growth in the peak plasma density with successive increase in the number of mask openings. An overall spectral blueshift of the fundamental and the third harmonics follows the plasma density increase. The simulated far-field on-axis emission agrees with the experiment and serves as the indication of nonlinear interaction in the fusion region.