Abstract
Quadratic cascading, i. e. the sequence of two second-order nonlinear processes, has assumed an important role in recent years as one of the possibilities for a low power, lossless, ultrafast approach to all-optical processing of signals. [1–5] The foundation of quadratic cascading is as old as quadratic nonlinear optics itself, but its implications were brought up later on in several theoretical [6–15] and experimental [16–22] reports outlining phase effects intrinsic to parametric interactions. More recently, however, it was the second-harmonic generation (SHG) experiment performed by DeSalvo et al. [1] in Potassium Tytanil Phosphate (KTP) the one which triggered a considerable effort in investigating both applications and novel effects of cascading, from switching to modulation, and from solitary waves to gap solitons [3–5, 23]. It is remarkable the number of papers published on the subject in the past five years, and the rapid progress in a field which is benefitting both from the established knowledge and understanding of cubic nonlinearities and phenomena, and from the advancements of material sciences and technology in the area of noncentrosymmetric crystals for electro-optical and parametric interactions.
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Assanto, G., Gallo, K., Conti, C. (1999). Plane and Guided Wave Effects and Devices Via Quadratic Cascading. In: Boardman, A.D., Pavlov, L., Tanev, S. (eds) Advanced Photonics with Second-Order Optically Nonlinear Processes. NATO Science Series, vol 61. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0850-1_2
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