Noncritical birefringence phase-matched second harmonic generation in a lithium-niobate-on-insulator micro-waveguide for green light emission

Lithium niobate on insulator (LNOI) holds great potential for frequency conversion, where a variety of high-performance nonlinear devices based on different structures has been demonstrated. Here, we report on second harmonic generation (SHG) in MgO-doped LNOI ridge micro-waveguides for efficient gr...

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Bibliographic Details
Published in:Optics letters 2024-03, Vol.49 (5), p.1121-1124
Main Authors: Ding, Tingting, Tang, Yongzhi, Li, Hao, Liu, Shijie, Zhang, Jing, Zheng, Yuanlin, Chen, Xianfeng
Format: Article
Language:English
Subjects:
Birefringence
Continuous radiation
Frequency converters
Light emission
Light sources
Lithium niobates
Phase matching
Second harmonic generation
Waveguides
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Summary:Lithium niobate on insulator (LNOI) holds great potential for frequency conversion, where a variety of high-performance nonlinear devices based on different structures has been demonstrated. Here, we report on second harmonic generation (SHG) in MgO-doped LNOI ridge micro-waveguides for efficient green light emission, via an exact type-I noncritical birefringence phase matching (BPM). The LNOI micro-waveguide has a cross section of ∼3×4 m , featuring low coupling loss with lens fiber. The normalized conversion efficiency from a continuous-wave (cw) pump to its second harmonic is measured to be 37%/Wcm in a single-pass configuration. The device shows both relatively high efficiency and a void of periodic poling, offering a potential solution for efficient and scalable green light sources and frequency converters.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.519484