Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air

N. G. Ivanov, V. F. Losev

Результат исследований: Материалы для журналаСтатья

3 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Страницы (с-по)331-336
Число страниц6
ЖурналAtmospheric and Oceanic Optics
Том30
Номер выпуска4
DOI
СостояниеОпубликовано - 1 июл 2017

ASJC Scopus subject areas

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

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