High-efficiency single-mode erbium-doped lithium niobate microring laser with milliwatt output power

Erbium-doped thin-film lithium niobate (TFLN) lasers have attracted great interest in recent years due to their compatibility with high-speed electro-optic (EO) modulation on the same platform. In this work, high-efficiency single-mode erbium-doped microring lasers with milliwatt output powers were...

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Bibliographic Details
Published in:Optics letters 2024-12, Vol.49 (24), p.6996
Main Authors: Sun, Chao, Liang, Youting, Liu, Jian, Zhou, Yuan, Zhang, Zhihao, Chen, Jinming, Liu, Zhaoxiang, Fang, Zhiwei, Wang, Min, Zhang, Haisu, Cheng, Ya
Format: Article
Language:English
Subjects:
Bright plating
Erbium
Lasers
Light sources
Lithium niobates
Microlasers
Photolithography
Thin films
Waveguides
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Summary:Erbium-doped thin-film lithium niobate (TFLN) lasers have attracted great interest in recent years due to their compatibility with high-speed electro-optic (EO) modulation on the same platform. In this work, high-efficiency single-mode erbium-doped microring lasers with milliwatt output powers were demonstrated. Monolithic lithium niobate microring resonators using pulley-waveguide-coupling were fabricated by the photolithography assisted chemo-mechanical etching (PLACE) technique. The maximum single-mode laser power of 1.26 mW with the side-mode suppression ratio (SMSR) of 50 dB was achieved around the wavelength of 1562 nm, as well as the maximum laser slope efficiency of 2.51% and the minimum laser linewidth of 30 kHz. Besides, the lasing band was easily switched by the pulley-coupler with variable waveguide widths. The demonstrated milliwatt-level on-chip microlasers hold great promise as bright light sources for various integrated devices on the TFLN platform such as EO modulators and combs.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.544271