Explicit solutions of the four-wave mixing model

Details Explicit solutions of the four-wave mixing model Explicit solutions of the four-wave mixing model

2009-03-31

arxiv.org/abs/0903.5476v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

16 pages, J Phys A Fast track communication, to appear 2009

Scientific paper

The dynamical degenerate four-wave mixing is studied analytically in detail. By removing the unessential freedom, we first characterize this system by a lower-dimensional closed subsystem of a deformed Maxwell-Bloch type, involving only three physical variables: the intensity pattern, the dynamical grating amplitude, the relative net gain. We then classify by the Painleve' test all the cases when singlevalued solutions may exist, according to the two essential parameters of the system: the real relaxation time tau, the complex response constant gamma. In addition to the stationary case, the only two integrable cases occur for a purely nonlocal response (Real(gamma)=0), these are the complex unpumped Maxwell-Bloch system and another one, which is explicitly integrated with elliptic functions. For a generic response (Re(gamma) not=0), we display strong similarities with the cubic complex Ginzburg-Landau equation.

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