HUIGNARD , J.-P.

We show that the Talbot effect can be used to increase the gaib of two-wave mixing in a stack of this nonlinear media. We demonstrate that a large gain enhancement is achieved for a new nonlinear elements, provided that they are placed at distances that satisfy Talbot recurrences.

We show that the Talbot effect can be used to increase the gaib of two-wave mixing in a stack of this nonlinear media. We demonstrate that a large gain enhancement is achieved for a new nonlinear elements, provided that they are placed at distances that satisfy Talbot recurrences.

In a photorefractive liquid crystal light valve, acting as a Kerr-like nonlinear optical medium, we show the appearance of optical patterns induced by a single mirror feedback. The spatial wavelength of the patterns scales with the distance between the mirror and the valve and the contrast of the patterns decreases for decreasing this distance....

A nonlinear optical medium results by the collective orientation of liquid crystal molecules tightly coupled to a transparent photoconductive layer. We show that such a medium can give a large gain, thus, if inserted in a ring cavity, it results in an unidirectional optical oscillator. Dynamical regimes with many interacting modes are made...