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.
| Original language | English |
|---|---|
| Pages (from-to) | 331-336 |
| Number of pages | 6 |
| Journal | Atmospheric and Oceanic Optics |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jul 2017 |
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Keywords
- filamentation
- focusing
- Kerr nonlinearity
- supercontinuum
ASJC Scopus subject areas
- Oceanography
- Atomic and Molecular Physics, and Optics
- Earth-Surface Processes
- Atmospheric Science
Cite this
Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air. / Ivanov, N. G.; Losev, V. F.
In: Atmospheric and Oceanic Optics, Vol. 30, No. 4, 01.07.2017, p. 331-336.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Kerr nonlinearity effect on femtosecond pulse radiation filamentation in air
AU - Ivanov, N. G.
AU - Losev, V. F.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - 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.
AB - 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.
KW - filamentation
KW - focusing
KW - Kerr nonlinearity
KW - supercontinuum
UR - http://www.scopus.com/inward/record.url?scp=85028029146&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028029146&partnerID=8YFLogxK
U2 - 10.1134/S1024856017040066
DO - 10.1134/S1024856017040066
M3 - Article
AN - SCOPUS:85028029146
VL - 30
SP - 331
EP - 336
JO - Atmospheric and Oceanic Optics
JF - Atmospheric and Oceanic Optics
SN - 1024-8560
IS - 4
ER -