Integrated fiber-mirror ion trap for strong ion-cavity coupling

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Brandstätter, B.; McClung, A.; Schüppert, K.; Casabone, B.; Friebe, K. et al.: Integrated fiber-mirror ion trap for strong ion-cavity coupling. In: Review of Scientific Instruments 84 (2013), Nr. 12, 123104. DOI:

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Sum total of downloads: 155

We present and characterize fiber mirrors and a miniaturized ion-trap design developed to integrate a fiber-based Fabry-Perot cavity (FFPC) with a linear Paul trap for use in cavity-QED experiments with trapped ions. Our fiber-mirror fabrication process not only enables the construction of FFPCs with small mode volumes, but also allows us to minimize the influence of the dielectric fiber mirrors on the trapped-ion pseudopotential. We discuss the effect of clipping losses for long FFPCs and the effect of angular and lateral displacements on the coupling efficiencies between cavity and fiber. Optical profilometry allows us to determine the radii of curvature and ellipticities of the fiber mirrors. From finesse measurements, we infer a single-atom cooperativity of up to 12 for FFPCs longer than 200 μm in length; comparison to cavities constructed with reference substrate mirrors produced in the same coating run indicates that our FFPCs have similar scattering losses. We characterize the birefringence of our fiber mirrors, finding that careful fiber-mirror selection enables us to construct FFPCs with degenerate polarization modes. As FFPCs are novel devices, we describe procedures developed for handling, aligning, and cleaning them. We discuss experiments to anneal fiber mirrors and explore the influence of the atmosphere under which annealing occurs on coating losses, finding that annealing under vacuum increases the losses for our reference substrate mirrors. X-ray photoelectron spectroscopy measurements indicate that these losses may be attributable to oxygen depletion in the mirror coating. Special design considerations enable us to introduce a FFPC into a trapped ion setup. Our unique linear Paul trap design provides clearance for such a cavity and is miniaturized to shield trapped ions from the dielectric fiber mirrors. We numerically calculate the trap potential in the absence of fibers. In the experiment additional electrodes can be used to compensate distortions of the potential due to the fibers. Home-built fiber feedthroughs connect the FFPC to external optics, and an integrated nanopositioning system affords the possibility of retracting or realigning the cavity without breaking vacuum. © 2013 © 2013 Author(s).
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2013
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 95 61.29%
2 image of flag of China China 22 14.19%
3 image of flag of United States United States 19 12.26%
4 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 4 2.58%
5 image of flag of Netherlands Netherlands 2 1.29%
6 image of flag of Korea, Republic of Korea, Republic of 2 1.29%
7 image of flag of France France 2 1.29%
8 image of flag of Portugal Portugal 1 0.65%
9 image of flag of Italy Italy 1 0.65%
10 image of flag of United Arab Emirates United Arab Emirates 1 0.65%
    other countries 6 3.87%

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