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.
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Original Russian Text © N.G. Ivanov, V.F. Losev, 2017, published in Optika Atmosfery i Okeana.
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Ivanov, N.G., Losev, V.F. Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air. Atmos Ocean Opt 30, 331–336 (2017). https://doi.org/10.1134/S1024856017040066
- Kerr nonlinearity