Second Harmonic Generation: Toward an All-Optical Transistor
One of the goals in the development of all-optical alternatives to electronic processing has been development of an optical equivalent to the semiconductor transistor. Different schemes have been suggested for all-optical (AO) modulators and transistors, most of them based on third-order nonlinearities. More recently, after the experiments by DeSalvo et al., attention has been paid to the cascading of second-order nonlinearities. The possibility of using cascaded quadratic effects to exploit the coherent nature of parametric interactions has spurred interest toward analog AO processes in second-order material systems, first among them the transistor.
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