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

doi:10.1088/1674-1056/abb232

Abstract 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^-1cm^-2 is achieved at telecom-band.

Keywords: second harmonic generation lithium niobate ridge waveguide dispersion manipulation

Received: 18 May 2020
Revised: 22 June 2020
Accepted manuscript online: 25 August 2020

PACS:	42.65.-k	(Nonlinear optics)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Wi	(Nonlinear waveguides)
	42.25.-p	(Wave optics)

Corresponding Authors: ^†Corresponding author. E-mail: zhxtong@mail.ustc.edu.cn

Cite this article:

Xin-Tong Zhang(张欣桐) Broadband and efficient second harmonic generation in LiNbO₃-LiTaO₃ composite ridge waveguides at telecom-band 2021 Chin. Phys. B 30 014205

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

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