On-chip electro-optically tunable narrow linewidth Brillouin microlasers implemented in thin film lithium niobate
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866908676833411072 |
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| author | Li, Chuntao Deng, Jiale Huang, Xingzhao Luo, Xiaochao Gao, Renhong Yu, Huakang Guan, Jianglin Khurgin, Jacob B. Li, Zhiyuan Lin, Jintian Cheng, Ya |
| author_facet | Li, Chuntao Deng, Jiale Huang, Xingzhao Luo, Xiaochao Gao, Renhong Yu, Huakang Guan, Jianglin Khurgin, Jacob B. Li, Zhiyuan Lin, Jintian Cheng, Ya |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_17443 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On-chip electro-optically tunable narrow linewidth Brillouin microlasers implemented in thin film lithium niobate Li, Chuntao Deng, Jiale Huang, Xingzhao Luo, Xiaochao Gao, Renhong Yu, Huakang Guan, Jianglin Khurgin, Jacob B. Li, Zhiyuan Lin, Jintian Cheng, Ya Optics 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. |
| title | On-chip electro-optically tunable narrow linewidth Brillouin microlasers implemented in thin film lithium niobate |
| topic | Optics |
| url | https://arxiv.org/abs/2411.17443 |