This article is cited in 5 papers

Nonlinear optical phenomena

Model of optical nonlinearity of air in the mid-IR wavelength range

Yu. È. Geints, A. A. Zemlyanov

V. E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Science, Tomsk

Abstract: A model of optical nonlinearity of air (atmospheric nitrogen and oxygen) is developed. This model can be used to calculate numerically the propagation of radiation with a wavelength close to 10 μm. It takes into account the electronic Kerr effect, higher order nonlinearities, ionisation of a gas medium by electron impact, and pulse group-velocity dispersion. The applicability limits of the Drude approximation for calculating the impact-ionisation rate are also considered.

Keywords: filamentation, far-IR range, laser radiation.

PACS: 42.65.Hw, 42.65.Jx, 33.80.Eh, 52.50.Jm

Received: 23.01.2014
Revised: 28.02.2014

 English version: Quantum Electronics, 2014, 44:9, 815–823

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