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arXiv · 2411.17443

On-chip electro-optically tunable narrow linewidth Brillouin microlasers implemented in thin film lithium niobate

Chuntao Li·Jiale Deng·Xingzhao Huang·Xiaochao Luo·Renhong Gao·Huakang Yu·Jianglin Guan·Jacob B. Khurgin·Zhiyuan Li·Jintian Lin·Ya Cheng
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Abstract

On-chip narrow linewidth microlasers with real-time wavelength tunability are highly desirable for various applications including precision metrology, quantum technology, and coherent information processing. Realizing such laser remains a challenge despite significant advances made by various groups in recent years [Nat. Commun. 13, 5344 (2022); Nature 615, 411 (2023); Appl. Phys. Lett. 124, 131101 (2024); Nat. Photonics 13, 60 (2019)]. In this work, we overcome these hurdles and demonstrate on-chip electro-optically tunable Brillouin microlasers in compact lithium niobate on insulator (LNOI) microdisks with diameters of 31.5 um and 117.0 um by using cross-polarized SBS arrangement. A quasi-continuum band of bound shear mechanical modes inside the suspended microdisk are revealed for the first time, allowing feasible phase matching of stimulated Brillouin lasing (SBL). We achieve efficient cross-polarized optomechanical coupling and SBL via the significant photoelastic tensors of lithium niobate (e.g., p41=-1.51). This approach yields a 118 Hz intrinsic linewidth and a comparatively low threshold power of 3.15 mW. A real-time electro-optic tuning of the cross-polarized Brillouin scheme with a tuning efficiency of ~93.1 kHz/V is also achieved, further showcasing potential of LNOI platform for next-generation tunable photonic systems.

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Chuntao Li, Jiale Deng, Xingzhao Huang, Xiaochao Luo, Renhong Gao, Huakang Yu, Jianglin Guan, Jacob B. Khurgin, Zhiyuan Li, Jintian Lin, Ya Cheng. 2024-11-26. On-chip electro-optically tunable narrow linewidth Brillouin microlasers implemented in thin film lithium niobate. https://arxiv.org/abs/2411.17443

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