NDLI: Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air

Content Provider	Springer Nature Link
Author	Ivanov, N. G. Losev, V. F.
Copyright Year	2017
Abstract	The conditions for filamentation of femtosecond pulse laser radiation when focusing in air are studied experimentally and theoretically. A good agreement between experimental and calculated results is shown if neglecting the filament plasma. It is shown that the Kerr nonlinearity plays a fundamental role in the generation, existence, and cessation of a filament at a small numerical aperture (NA ≤ 2.15 × 10$^{–3}$). The Kerr effect first leads to the beam self-focusing and generation of a filament, and at the final stage, to radiation defocusing and a sharp decrease in its axial intensity due to the beam wavefront distortions. In the case of aberration focusing, a spatial quasi-soliton is formed after a visible filament due to the balance between Kerr self-focusing and diffraction spreading. The quasi-soliton is a source of the directional white supercontinuum.
Starting Page	331
Ending Page	336
Page Count	6
File Format	PDF
ISSN	10248560
Journal	Atmospheric and Oceanic Optics
Volume Number	30
Issue Number	4
e-ISSN	20700393
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-08-24
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Kerr nonlinearity filamentation focusing supercontinuum Optics, Lasers, Photonics, Optical Devices
Content Type	Text
Resource Type	Article
Subject	Oceanography Earth-Surface Processes Ecological Modeling Pollution Atmospheric Science Instrumentation Atomic and Molecular Physics, and Optics

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