Abstract

Second-order cascading via second-harmonic generation (SHG) and downconversion back to the fundamental frequency (FF) has been proven to be an effective approach in obtaining large phase shifts. [1-4] We discuss here a specific SHG configuration involving two spatially orthogonal components of the FF input wave, i.e. a Type II configuration, which only recently Belostotsky et al. have addressed for cascading effects. [5] Hereby, on the grounds of a numerical analysis, we demonstrate that cascading in Type II SHG can be effectively utilized for all-optical modulation and transistor action. This scheme is simple and promising in terms of practical implementations with existing crystals.

© 1995 Optical Society of America