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Fundamental linewidth of an AlN microcavity Raman laser

Kewei Liu, Shunyu Yao, Yulei Ding, Zihao Wang, Yanan Guo, Jianchang Yan, Junxi Wang, Changxi Yang, and Chengying Bao

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Abstract

Raman lasing can be a promising way to generate highly coherent chip-based lasers, especially in high-quality (high-Q) crystalline microcavities. Here, we measure the fundamental linewidth of a stimulated Raman laser in an aluminum nitride (AlN)-on-sapphire microcavity with a record Q-factor up to 3.7 million. An inverse relationship between fundamental linewidth and emission power is observed. A limit of the fundamental linewidth, independent of Q-factor, due to Raman-pump-induced Kerr parametric oscillation is derived.

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Corrections

17 August 2022: A typographical correction was made to the text before Eq. (2).

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Equations (6)

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