Journal
PHYSICAL REVIEW A
Volume 94, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.94.041801
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Funding
- Russian Science Foundation [16-42-01060]
- U.S. Air Force Office of Scientific Research under MURI award [FA9550-16-1-0013]
- U.S. Defense Threat Reduction Agency [HDTRA 1-14-1-0009]
- Russian Science Foundation [16-42-01060] Funding Source: Russian Science Foundation
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Through 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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