Second-harmonic generation device with integrated periodically domain-inverted regions and distributed Bragg reflector in a LiNbO3 channel waveguide

Abstract
We propose a new structure of LiNbO3 guided wave second‐harmonic generation device, in which the fundamental light beam is sufficiently confined by two distributed Bragg reflectors (DBRs) formed at input and output ports. The 40% increase in the conversion compared with a conventional device without DBR was achieved under a quasi‐phase matching condition.