Nonlinear Enhancement of Resonance Absorption at the Filamentation of a Mid-Infrared Pulse in High-Pressure Gases

It has been found experimentally that the filamentation of a femtosecond pulse with a central wavelength of 1.3 µm in a mixture of nitrogen at a pressure of 30 bar and water vapor at a pressure of 2 mbar results in the redshift of the spectrum of the pulse and in the corresponding enhancement of res...

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Bibliographic Details
Published in:JETP letters 2020, Vol.111 (1), p.31-35
Main Authors: Kompanets, V. O., Shipilo, D. E., Nikolaeva, I. A., Panov, N. A., Kosareva, O. G., Chekalin, S. V.
Format: Article
Language:English
Subjects:
Absorption spectra
Atomic
Biological and Medical Physics
Biophysics
Computer simulation
Femtosecond pulses
Molecular
Molecular gases
Nonresonance
Optical and Plasma Physics
Optics and Laser Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Red shift
Resonance absorption
Solid State Physics
Spintronics
Water vapor
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Summary:It has been found experimentally that the filamentation of a femtosecond pulse with a central wavelength of 1.3 µm in a mixture of nitrogen at a pressure of 30 bar and water vapor at a pressure of 2 mbar results in the redshift of the spectrum of the pulse and in the corresponding enhancement of resonance absorption at water lines near a wavelength of 1.35 µm. A replica of the resonance absorption band has been detected in the continuous spectrum of a pulse transmitted through the cell. The characteristic absorption lines of water detected experimentally correspond to the results of the numerical simulation of a three-dimensional nonstationary problem taking into account the resonance and nonresonance absorption in molecular gases.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364020010129