Abstract
Forward degenerate fourwave mixing in CuCl in the vicinity of the two-photon absorption on the biexciton can be analyzed from two complementary theoretical points of view :(a) In terms of the traditional perturbational formulation of nonlinear optics, the low intensity observations can be accounted for in terms of interferences and re-normalizations among different-order elementary mixing processes (b) In terms of a perturbational scheme which provides directly an analytic expression for the intensity-dependent dielectric function of the material. This last approach points to a potentially bistable optical response when local field effects are included in the calculation.
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