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arXiv · 2609.15304

High-efficiency integrated laser on erbium-doped lithium niobate-on-insulator

Chunyu Zhang·Yuqi Zhang·Yiyang Zou·Xiaomin Wang·Binwen Niu·Cangsu Yuan·Tongxin Xue·Chunlin Zhu·Hongde Liu·Dahuai Zheng·Shiguo Liu·Fang Bo·Yongfa Kong·Jingjun Xu
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Abstract

Lithium niobate on insulator (LNOI) combines the outstanding optical properties of lithium niobate (LN) with strong optical confinement, scalable fabrication and high-density integration, making it a leading platform for integrated photonic chips. Recent advances in LNOI photonics have mainly centred on passive and electro-optic components, including couplers, waveguides, microcavities and modulators, whereas efficient on-chip laser sources remain insufficiently developed, limiting the realization of fully integrated LN photonic systems. Because LN is an indirect-bandgap material, lasing on LNOI generally relies on photoluminescence from rare-earth-ion doping, yet the conversion efficiency of doped LNOI lasers has remained low. By comparing LNOI microcavity lasers with fibre lasers and waveguide amplifiers, we identify the limited number of rare-earth ions participating in stimulated emission as a key factor responsible for inefficient pump utilization. Here we demonstrate an integrated Er-doped LNOI laser that combines high-quality, highly Er-doped LN, a large-diameter wide-microring resonator, a low-loss waveguide amplifier and bidirectional pumping. This architecture enables a slope efficiency of 16.91% at 1562 nm, exceeding 10% on the LNOI platform for the first time. Our results provide a route towards high-efficiency LNOI lasers for fully integrated photonic systems.

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Chunyu Zhang, Yuqi Zhang, Yiyang Zou, Xiaomin Wang, Binwen Niu, Cangsu Yuan, Tongxin Xue, Chunlin Zhu, Hongde Liu, Dahuai Zheng, Shiguo Liu, Fang Bo, Yongfa Kong, Jingjun Xu. 2026-09-14. High-efficiency integrated laser on erbium-doped lithium niobate-on-insulator. https://arxiv.org/abs/2609.15304

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