Abstract
It is well recognized that two-step second-order (orχ(2): χ(2) cascading provides an efficient way to generate an effective nonlinear phase shift for the purposes of all-optical nonlinear switching [1]. Cascading of χ(2) processes allows all-optical switching to be achieved at pump levels substantially lower than those usually available in centrosymmetric media with highest known cubic nonlinearity [2]. A further search for the methods allowing to reduce the switching power is crucial for the future applications of all-optical devices based on cascading of χ(2) processes. The switching intensity is usually connected with the input power density necessary for achieving a nonlinear phase shift (NPS) of the amount of π or π/2, depending of the type of the device. The larger is the efficiency of the NPS generation, the lower is the switching intensity. Some methods for an enhancement of the NPS in quadratic nonlinear media with two-step second-order cascading processes have been recently suggested in [3, 4].
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