A small mode volume tunable microcavity: development and characterization

Greuter, Lukas and Starosielec, Sebastian and Najer, Daniel and Ludwig, Arne and Duempelmann, Luc and Rohner, Dominik and Warburton, Richard J.. (2014) A small mode volume tunable microcavity: development and characterization. Applied Physics Letters, 105 (12). p. 121105.

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Official URL: http://edoc.unibas.ch/dok/A6337955

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We report the realization of a spatially and spectrally tunable air-gap Fabry-Pérot type microcavity of high finesse and cubic-wavelength-scale mode volume. These properties are attractive in the fields of opto-mechanics, quantum sensing, and foremost cavity quantum electrodynamics. The major design feature is a miniaturized concave mirror with atomically smooth surface and radius of curvature as low as 10 μm produced by CO2 laser ablation of fused silica. We demonstrate excellent mode-matching of a focussed laser beam to the microcavity mode and confirm from the frequencies of the resonator modes that the effective optical radius matches the physical radius. With these small radii, we demonstrate wavelength-size beam waists. We also show that the microcavity is sufficiently rigid for practical applications: in a cryostat at 4 K, the root-mean-square microcavity length fluctuations are below 5 pm.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J and Greuter, Lukas and Starosielec, Sebastian and Najer, Daniel and Rohner, Dominik
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article -- The final publication is available at AIP Publishing, see Doi link
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Last Modified:23 Feb 2017 13:14
Deposited On:06 Feb 2015 09:59

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