Femtosecond filament emergence between π-shifted beamlets in air

Femtosecond filament emergence between π-shifted beamlets in air

By rotating the four-section π-shifted phase plate in the transverse plane relatively to the axes of the elliptical beam of 800-nm, 1.1-mJ, 35-fs pulse propagating in air, we switch between the regime of four parallel plasma channels and the regime of spatial symmetry breakup followed by on-axis pla...

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Veröffentlicht in:Optics express 2020-01, Vol.28 (2), p.1002-1013
Hauptverfasser: Chu, Chunyue, Shipilo, Daniil E, Lu, Dan, Zhang, Zhi, Chuchupal, Sergey V, Panov, Nikolay A, Kosareva, Olga G, Liu, Weiwei
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container_end_page 1013
container_issue 2
container_start_page 1002
container_title Optics express
container_volume 28
creator Chu, Chunyue
Shipilo, Daniil E
Lu, Dan
Zhang, Zhi
Chuchupal, Sergey V
Panov, Nikolay A
Kosareva, Olga G
Liu, Weiwei
description By rotating the four-section π-shifted phase plate in the transverse plane relatively to the axes of the elliptical beam of 800-nm, 1.1-mJ, 35-fs pulse propagating in air, we switch between the regime of four parallel plasma channels and the regime of spatial symmetry breakup followed by on-axis plasma channel formation identified on the burnt paper images of the beam. Relaxation of the π-phase shift for 45 phase plate rotation is demonstrated explicitly in 3D+time carrier wave resolved numerical simulations yielding the initial step-like phase distribution degradation along the plasma region. This degradation becomes negligible as the angle between the ellipse major axis and the π-phase break line decreases to 15 .
doi_str_mv 10.1364/OE.380985
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title Femtosecond filament emergence between π-shifted beamlets in air
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