Second-harmonic and cascaded third-harmonic generation in generalized quasiperiodic poled lithium niobate waveguides

Lithium niobate (LN) thin film has recently emerged as an important platform for nonlinear optical investigations for its large χ nonlinear coefficients and ability of light localization. In this Letter, we report the first, to the best of our knowledge, fabrication of LN-on-insulator ridge waveguid...

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Bibliographic Details
Published in:Optics letters 2023-04, Vol.48 (7), p.1906-1909
Main Authors: Zhang, Li, Wu, Xiao, Hao, Zhenzhong, Ma, Rui, Gao, Feng, Bo, Fang, Zhang, Guoquan, Xu, Jingjun
Format: Article
Language:English
Subjects:
Electric fields
Harmonic generations
Lithium niobates
Nonlinear optics
Superlattices
Thin films
Waveguides
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Summary:Lithium niobate (LN) thin film has recently emerged as an important platform for nonlinear optical investigations for its large χ nonlinear coefficients and ability of light localization. In this Letter, we report the first, to the best of our knowledge, fabrication of LN-on-insulator ridge waveguides with generalized quasiperiodic poled superlattices using the electric field polarization technique and microfabrication techniques. Benefiting from the abundant reciprocal vectors, we observed efficient second-harmonic and cascaded third-harmonic signals in the same device, with normalized conversion efficiency of 1735% W  cm and 0.41% W  cm , respectively. This work opens a new direction for nonlinear integrated photonics based on LN thin film.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.483431