Simultaneous generation of Raman-assisted Soliton Microcombs and Tunable Multi-chromatic Raman Microlasers in Single Monolithic Thin-film Lithium Niobate Microrings

Yingnuo Qiu; Renhong Gao; Chuntao Li; Yixuan Yang; Xinzhi Zheng; Guanghui Zhao; Xiaochao Luo; Qifeng Hou; Lingling Qiao; Min Wang; Jintian Lin; Ya Cheng

arXiv · 2511.21201

Simultaneous generation of Raman-assisted Soliton Microcombs and Tunable Multi-chromatic Raman Microlasers in Single Monolithic Thin-film Lithium Niobate Microrings

Yingnuo Qiu·Renhong Gao·Chuntao Li·Yixuan Yang·Xinzhi Zheng·Guanghui Zhao·Xiaochao Luo·Qifeng Hou·Lingling Qiao·Min Wang·Jintian Lin·Ya Cheng

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Abstract

High-performance integrated broadband coherent light sources are essential for advanced applications in high-bandwidth data processing and chip-scale metrology, yet remain challenging. In this study, we demonstrate a monolithic Z-cut lithium niobate on insulator (LNOI) microring platform that enables simultaneous generation of tunable multi-chromatic microlasers and Raman-assisted soliton microcombs. Exploiting the strong Raman activity and high second-order nonlinearity of LNOI, we engineered a dispersion-optimized microring with a loaded Q factor of 3.86X10^6, facilitating on-chip efficient broadband coherent light source. A novel phase-matching configuration with all the waves of the same ordinary polarization was realized for the first time in this platform, feasibly enabling modal-phase matched Raman-quadratic nonlinear processes that extend lasing signals into the visible spectrum. Under continuous-wave laser pumping at 3.73 mW in the telecom band, we achieved a Raman-assisted soliton comb centered at 1624.49 nm with record-low pump threshold on the LNOI platform. Concurrently, multi-chromatic Raman lasing outputs were observed at ~1700, ~813, and ~535 nm within the same microring. The system exhibited efficient wavelength tuning of these multi-chromatic laser signals through a 5 nm shift in pump wavelength. This work represents a significant advance in integrated photonics for versatile optical signal generation.

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Yingnuo Qiu, Renhong Gao, Chuntao Li, Yixuan Yang, Xinzhi Zheng, Guanghui Zhao, Xiaochao Luo, Qifeng Hou, Lingling Qiao, Min Wang, Jintian Lin, Ya Cheng. 2025-11-26. Simultaneous generation of Raman-assisted Soliton Microcombs and Tunable Multi-chromatic Raman Microlasers in Single Monolithic Thin-film Lithium Niobate Microrings. https://arxiv.org/abs/2511.21201

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