Broadband Second Harmonic Generation in a z-Cut Lithium Niobate on Insulator Waveguide Based on Type-I Modal Phase Matching

We numerically investigate a second harmonic generation (SHG) in a z-cut lithium niobate on insulator (LNOI) waveguide based on type-I mode phase matching (MPM) between two fundamental modes. A mode overlap factor that is close to unity is achieved and the normalized SHG efficiency reaches up to 72....

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Bibliographic Details
Published in:Photonics 2023-01, Vol.10 (1), p.80
Main Authors: Wang, Changwen, Zhong, Haozong, Ning, Minghao, Fang, Bin, Li, Lin, Cheng, Ya
Format: Article
Language:English
Subjects:
Broadband
Design
Efficiency
Electric fields
Geometry
Lithium
lithium niobate on insulator
Lithium niobates
nonlinear frequency conversion
Optics
Phase matching
Plasma etching
Propagation
Second harmonic generation
Waveguides
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Summary:We numerically investigate a second harmonic generation (SHG) in a z-cut lithium niobate on insulator (LNOI) waveguide based on type-I mode phase matching (MPM) between two fundamental modes. A mode overlap factor that is close to unity is achieved and the normalized SHG efficiency reaches up to 72.1% W−1cm−2 at the telecommunication band, together with a large spectral tunability of 2.5 nm/K. Moreover, a bandwidth of about 100 nm for the broad SHG in a 5 mm-long LNOI ridge waveguide is demonstrated with this scheme. This stratagem will inspire new integrated nonlinear frequency conversion methods for versatile applications.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10010080