Broadband and efficient second harmonic generation in LiNbO3-LiTaO3 composite ridge waveguides at telecom-band

Broadband nonlinear frequency conversions of optical waves are widely employed in multiple areas of optics and photonics. However, the broadening of conversion bandwidth is often at a cost of reduction in efficiency, which may induce a limitation on practical applications. Here we theoretically propose a novel design of LiNbO3 ridge waveguides on LiTaO3 substrates which can be used for efficient and broadband second harmonic generation. Through group velocity engineering of the ridge waveguides, acceptance bandwidth over 20 nm with a high conversion efficiency of > 25 %W-1 . cm(-2) is achieved at telecom-band.

Automated summary

By engineering the group velocity of LiNbO3 ridge waveguides on LiTaO3 substrates, efficient and broadband second harmonic generation is achieved with acceptance bandwidth over 20 nm at telecom-band, and a high conversion efficiency of > 25 %W-1 . cm(-2).