Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/106370
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Type: Journal article
Title: A microrod-resonator Brillouin laser with 240 Hz absolute linewidth
Author: Loh, W.
Becker, J.
Cole, D.
Coillet, A.
Baynes, F.
Papp, S.
Diddams, S.
Citation: New Journal of Physics, 2016; 18(4):045001-1-045001-9
Publisher: IOP Publishing
Issue Date: 2016
ISSN: 1367-2630
1367-2630
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William Loh, Joe Becker, Daniel C Cole, Aurelien Coillet, Fred N Baynes, Scott B Papp and Scott A Diddams
Abstract: Wedemonstrate an ultralow-noise microrod-resonator based laser that oscillates on the gain supplied by the stimulated Brillouin scattering optical nonlinearity. Microresonator Brillouin lasers are known to offer an outstanding frequency noise floor, which is limited by fundamental thermal fluctuations. Here, we show experimental evidence that thermal effects also dominate the close-to-carrier frequency fluctuations. The 6mmdiameter microrod resonator used in our experiments has a large optical mode area of∼100 μm2, and hence its 10 ms thermal time constant filters the close-to-carrier optical frequency noise. The result is an absolute laser linewidth of 240 Hz with a corresponding white-frequency noise floor of 0.1 Hz2 Hz−1.We explain the steady-state performance of this laser by measurements of its operation state and of its mode detuning and lineshape. Our results highlight a mechanism for noise that is common to many microresonator devices due to the inherent coupling between intracavity power and mode frequency.Wedemonstrate the ability to reduce this noise through a feedback loop that stabilizes the intracavity power.
Rights: ©2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
DOI: 10.1088/1367-2630/18/4/045001
Published version: http://dx.doi.org/10.1088/1367-2630/18/4/045001
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Physics publications

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