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Published September 20, 2020 | Supplemental Material + Published
Journal Article Open

Linewidth enhancement factor in a microcavity Brillouin laser


The linewidth of regenerative oscillators is enhanced by amplitude–phase coupling of the oscillator field [Phys. Rev. 160, 290 (1967)]. In laser oscillators, this effect is well known for its impact on semiconductor laser performance. Here, this coupling is studied in Brillouin lasers. Because their gain is parametric, the coupling and linewidth enhancement are shown to originate from phase mismatch. The theory is confirmed by measurement of linewidth in a microcavity Brillouin laser, and enhancements as large as 50× are measured. The results show that pump wavelength and device temperature should be carefully selected and controlled to minimize linewidth. More generally, this work provides a new perspective on the linewidth enhancement effect.

Additional Information

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 2 April 2020; revised 27 July 2020; accepted 28 July 2020 (Doc. ID 394311); published 4 September 2020. The authors thank Y. Lai, Q. Yang, and C. Bao for helpful discussions. Funding. Air Force Office of Scientific Research (FA9550-18-1-0353); Caltech Kavli Nanoscience Institute. The authors declare no conflicts of interest. See Supplement 1 for supporting content.

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Published - optica-7-9-1150.pdf

Supplemental Material - 4741427.pdf


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August 19, 2023
October 20, 2023