An erbium-doped lithium niobate micro-cavity laser
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rch 2021 Vol. 64 No. 3: 234261 https://doi.org/10.1007/s11433-020-1636-2
Editor’s Focus
Editor’s Focus
An erbium-doped lithium niobate micro-cavity laser Lithium niobate is a popular material in the field of optical research, owing to its excellent physical properties such as nonlinearity, electro-optic and acousto-optic properties, piezoelectricity and photoelasticity. Along with the great progress in lithium niobate on insulator (LNOI), lithium niobate has raised a growing interest in the field of integrated optoelectronics in recent years [1], enabling the development of a wide range of integrated optoelectronic devices with excellent performance on LNOI, including frequency doublers, modulators and filters. For a complete lithium niobate optoelectronic integrated chip, its on-chip communication band light source is an indispensable part. Besides, a communication-band light source is crucial to quantum communication [2], quantum key distribution [3] and the test of quantum mechanics fundamentals [4]. The development of lasers on LNOI is therefore in urgent need. As we all know, the rare-earth erbium ion energy level system meets the conditions for laser radiation in a communication band. Thus an on-chip integrated lithium niobate micro-laser is anticipated via doping lithium niobate with erbium ions, combining the whispering gallery mode micro-disk cavity with a small size and high-quality factor, and choosing a suitable pump source. Liu et al. [5] from Shanghai Jiao Tong University have recently fabricated an on-chip micro-cavity laser using high-quality factor micro-disk resonators on erbium-doped LNOI. They used solid-state lasers in the 980 and 1460 nm band as pump sources and achieved high-efficiency laser outputs at 1530 and 1560 nm in the communication band. Soon after Liu et al.’s submission being accepted by Science China-Physics, Mechanics & Astronomy (SCPMA), Luo et al. [6] from Nankai University reported an independent work on-chip micro-cavity laser using high-quality factor micro-disk resonators on erbium-doped LNOI, which has also been accepted by SCPMA. These two reports on on-chip lithium niobate micro-lasers mark a significant step towards the integration of light sources and various functional devices on one chip. GuiLu Long Department of Physics, Tsinghua University, Beijing 100084, China
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Astron. 61, 030311 (2018). 5 Y. A. Liu, X. S. Yan, J. W. Wu, B. Zhu, Y. P. Chen, and X. F. Chen, Sci. China-Phys. Mech. Astron. 64, 234262 (2021). 6 Q. Luo, Z. Z. Hao, C. Yang, R. Zhang, D. H. Zheng, S. G. Liu, H. D. Liu, F. Bo, Y. F. Kong, G. Q. Zhang, and J. J. Xu, Sci. China-Phys. Mech. Astron. 64, 234263 (2
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