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Propagation of a Gaussian light beam in a nonlinear medium with a complex susceptibility

V. G. Kukushkin


Abstract: The problem of transformation of the parameters of a Gaussian light beam in a nonlinear medium with a complex susceptibility is solved. The parabolic approximation for the wave equation is employed. The results obtained can be used in the design of resonators and waveguides with nonlinear components. A study is made of the influence of the complex part of a nonlinear susceptibility of a substance on the threshold conditions for the self-focusing in the case of resonant absorption in a two-level system. It is shown that in this case it is possible to expect self-focusing of radiation on the low-frequency side of an absorption line.

UDC: 621.373.826

PACS: 42.65.An, 42.60.Jf, 42.60.Da, 42.65.Wi, 42.65.Jx, 02.30.Mv

Received: 03.12.1984

 English version: Soviet Journal of Quantum Electronics, 1985, 15:8, 1137–1138

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