Supercontinuum of a 3.9-μ m filament in air

Formation of a two-octave plateau and nonlinearly enhanced linear absorption

Nikolay A. Panov, Daniil E. Shipilo, Vera A. Andreeva, Olga G. Kosareva, Alexander M. Saletsky, Huailiang Xu, Pavel G Polynkin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Through numerical simulations we reveal the scenario of 3.9-μm filament spectrum enrichment in the atmosphere in the cases of linear and circular polarization of the incident pulse. The discrete spectrum of odd harmonics transforms into the two-octave plateau in the case of linear polarization. In contrast, in the case of circular polarization of the incident pulse, the harmonic-free flat supercontinuum appears with the plasma onset, reaching the tenth harmonic of the input radiation. We identify the energy balance specific to the filamentation near 4 μm: the absorption on CO2 lines in the atmosphere is accelerated by the self-phase modulation in the Kerr nonlinearity early before the plasma channel is formed. This nonlinearly enhanced linear absorption overwhelms the plasma losses and conversion of the input pulse energy to the higher harmonics as well as the plateau.

Original languageEnglish (US)
Article number041801
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume94
Issue number4
DOIs
StatePublished - Oct 6 2016

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octaves
plateaus
filaments
harmonics
air
circular polarization
linear polarization
pulses
plasma loss
atmospheres
phase modulation
nonlinearity
energy
radiation
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Supercontinuum of a 3.9-μ m filament in air : Formation of a two-octave plateau and nonlinearly enhanced linear absorption. / Panov, Nikolay A.; Shipilo, Daniil E.; Andreeva, Vera A.; Kosareva, Olga G.; Saletsky, Alexander M.; Xu, Huailiang; Polynkin, Pavel G.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 94, No. 4, 041801, 06.10.2016.

Research output: Contribution to journalArticle

Panov, Nikolay A. ; Shipilo, Daniil E. ; Andreeva, Vera A. ; Kosareva, Olga G. ; Saletsky, Alexander M. ; Xu, Huailiang ; Polynkin, Pavel G. / Supercontinuum of a 3.9-μ m filament in air : Formation of a two-octave plateau and nonlinearly enhanced linear absorption. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2016 ; Vol. 94, No. 4.
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