Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air

N. G. Ivanov, V. F. Losev

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalAtmospheric and Oceanic Optics
Issue number4
Publication statusPublished - 1 Jul 2017


  • filamentation
  • focusing
  • Kerr nonlinearity
  • supercontinuum

ASJC Scopus subject areas

  • Oceanography
  • Atomic and Molecular Physics, and Optics
  • Earth-Surface Processes
  • Atmospheric Science

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