Chaos in optical phase conjugation
^1) Institute of Physics, PO Box 57, 11001 Belgrade, Yugoslavia
^2) Electro-Optics Technology Center, Tufts University, Medford Mass 02155, U.S.A.
Nonlinear World , p. 387-398
World Scientific
IV International Workshop on Nonlinear and Turbulent Processes in
Physics
9-22 October 1989. Kiev, USSR
We have investigated instabilities in optical phase conjugation
arising in different geometrical arrangements, and driven by different control
parameters. First a single photorefractive crystal has been cosidered, with the
conjugation achieved through a single region four wave mixing. It is shown
(by numerical integration of slowly varying envelope equations) that the phase
conjugate output becomes chaotic when the system operates above the selfoscillation
threshold, and is driven by the input signal. Second, a resonator configuration
has been considered, with a thin Kerr-type phase conjugator operating in the Raman-Nath
approximation. In this case wave and medium propagation equations are reduced to two
dimensional iterative multimodal map, wich is driven to chaos by increasing the
pump beam intensity. In both cases predominantly Feigenbaum and intermittency
chaotic scenarios have been observed.