Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air

Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air 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. Atmospheric and Oceanic Optics Springer Journals

Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air

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Pleiades Publishing
Copyright © 2017 by Pleiades Publishing, Ltd.
Physics; Optics, Lasers, Photonics, Optical Devices
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