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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Effects (Cavity QED)

Q 61.2: Vortrag

Freitag, 15. März 2019, 10:45–11:00, S Gr. HS Maschb.

Production of Mode-Matched Fiber Fabry-Pérot Cavities — •David Röser, Hannes Pfeifer, Deepak Pandey, Wolfgang Alt, and Dieter Meschede — Institute for Applied Physics, University of Bonn

Fiber Fabry-Pérot cavities are formed by mirrors directly manufactured onto fiber end facets. Efficient coupling into these high finesse cavities benefits from spatial mode matching from the injecting single mode fiber (SM) to the cavity mode [1, 2].

We show how the mode matching condition can be met by splicing the injection fiber to a graded-index (GRIN) fiber lens. An attached large-core multimode (MM) fiber section acts as a mirror substrate [3]. For this purpose we cleave GRIN and MM fiber to well defined lengths with precision below 5 micrometer.

The mirror surface is afterwards micro-machined on the fiber end tip by CO2 laser pulse ablation at 9.3 micrometer wavelength [4]. Intensity stabilized laser pulses are applied in single and multi-shot technique for shaping the fiber end facets with vanishing ellipticity. Subsequently, high reflective coatings are applied to produce high quality fiber mirrors for applications including quantum information processing, spectroscopy or sensing, which profit from enhanced light-matter interaction at the single photon level.

[1] J. Gallego et al., Appl. Phys. B 122:47 (2016)

[2] B. Brandstätter et al., Rev. Sci. Instrum. 84, 123104 (2013);

[3] G. Gulati et al., Scien. Rep. 7, 5556 (2017)

[4] D. Hunger et al., NJP. 12, 065038 (2010)