Optical Triode Based on Electrically Induced Quadratic Cascading in an Optical Superlattice

Abstract

×Χ×We demonstrate here an optical triode from the principle of electrically induced quadratic cascading in single lithium niobate optical superlattice, predicted by the united theory of second-harmonic generation/parametric down conversion and electro-optic effect. In the optical superlattice, the e-polarized fundamental wave is first converted to double frequency one with the same polarization. At the “on” state, the PDC after SHG is triggered by a weak o-polarized fundamental wave (control wave) with the aid of applied electric field at the point where fundamental wave almost exhausted; finally, the double frequency wave is converted again to e-polarized fundamental one as high output. And when the control wave is absent, only the SHG takes place; fundamental output is at “off” state. The optical triode would have a response shorter than ps and a amplification ratio of 2*103