Symmetries of Optical Phase Conjugation

Details Symmetries of Optical Phase Conjugation Symmetries of Optical Phase Conjugation

2000-07-08

arxiv.org/abs/physics/0007019v1

Physics

Optics

Scientific paper

Various algebraic structures of degenerate four-wave mixing equations of optical phase conjugation are analyzed. Two approaches (the spinorial and the Lax-pair based), complementary to each other, are utilized for a systematic derivation of conserved quantities. Symmetry groups of both the equations and the conserved quantities are determined, and the corresponding generators are written down explicitly. Relation between these two symmetry groups is found. Conserved quantities enable the introduction of new methods for integration of the equations in the cases when the coupling $\Gamma$ is either purely real or purely imaginary. These methods allow for both geometries of the process, namely the transmission and the reflection, to be treated on an equal basis. One approach to introduction of Hamiltonian and Lagrangian structures for the 4WM systems is explored, and the obstacles in successful implementation of that programe are identified. In case of real coupling these obstacles are removable, and full Hamiltonian and Lagrangian formulations of the initial system are possible.

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