Suppression of small-scale self-focusing of high-power laser beams due to their self-filtration during propagation in free space

It has been experimentally confirmed that self-cleaning of a laser beam from spatial noise during propagation in free space makes it possible to suppress efficiently the self-focusing instability without applying spatial filters. Measurements of the instability increment by two independent methods h...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2018-04, Vol.48 (4), p.325-331
Main Authors: Ginzburg, V.N., Kochetkov, A.A., Potemkin, A.K., Khazanov, E.A.
Format: Article
Language:English
Subjects:
Beam splitters
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
FILTRATION
FOCUSING
Frequency doublers
High power lasers
high-power femtosecond laser beams
INSTABILITY
Laser beams
LASERS
LIGHT TRANSMISSION
Noise propagation
Optical components
OPTICS
Phase plates
self-filtration
small-scale self-focusing
Spatial filtering
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Summary:It has been experimentally confirmed that self-cleaning of a laser beam from spatial noise during propagation in free space makes it possible to suppress efficiently the self-focusing instability without applying spatial filters. Measurements of the instability increment by two independent methods have demonstrated quantitative agreement with theory and high efficiency of small-scale self-focusing suppression. This opens new possibilities for using optical elements operating in transmission (frequency doublers, phase plates, beam splitters, polarisers, etc.) in beams with intensities on the order of a few TW cm−2.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16637