Supercontinuum of a 3.9μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption
AuthorPanov, Nikolay A.
Shipilo, Daniil E.
Andreeva, Vera A.
Kosareva, Olga G.
Saletsky, Alexander M.
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationSupercontinuum of a 3.9-μm filament in air: Formation of a two-octave plateau and nonlinearly enhanced linear absorption 2016, 94 (4) Physical Review A
JournalPhysical Review A
Rights© 2016 American Physical Society.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractThrough numerical simulations we reveal the scenario of 3.9-mu m 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 mu m: 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.
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