Diffraction Impact onto Regularized Plasma Channel Formation by Femtosecond Laser Filamentation

Focused femtosecond beam filamentation after amplitude masks has been studied experimentally and numerically. We deduced conditions (energy per hole, diameter and geometrical composition of holes, focal length) providing for the formation of the regularized bundle of filaments or single on-axis fila...

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Bibliographic Details
Published in:Photonics 2023-08, Vol.10 (8), p.928
Main Authors: Mitina, Ekaterina, Uryupina, Daria, Shipilo, Daniil, Nikolaeva, Irina, Panov, Nikolay, Volkov, Roman, Kosareva, Olga, Savel’ev, Andrei
Format: Article
Language:English
Subjects:
Acoustics
Arrays
diffraction
Energy
femtosecond filamentation
Filamentation
Filaments
Kerr effect
Lasers
Nonlinear systems
Nonlinearity
Plasma
Propagation
Pulse duration
Radiation
regularized array of filaments
Sensors
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Summary:Focused femtosecond beam filamentation after amplitude masks has been studied experimentally and numerically. We deduced conditions (energy per hole, diameter and geometrical composition of holes, focal length) providing for the formation of the regularized bundle of filaments or single on-axis filament at the given pulse duration and beam diameter. We showed that a light channel with small diameter (∼200 μm) and overcritical peak power may be formed well before both the focal distance and the Marburger length, and this channel collapses due to self-focusing and forms the filament. The start position of such a filament can be predicted based on the linear propagation equation, while a more sophisticated non-linear approach that takes into account the Kerr nonlinearity, plasma effects, etc., helps to describe the temporal structure of a filament, its frequency, and its angular spectrum.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10080928