Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.16: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Passively Stable Optical Fiber Cavities — •Seyed Khalil Alavi, Wolfgang Alt, Jose C. Gallego Fernández, Sutapa Ghosh, Miguel Martinez-Dorantes, Dieter Meschede, and Lothar Ratschbacher — Institut für Angewandte Physik, Wegelerstr. 8, D-53115, Bonn, Germany

Optical Fabry-Pérot cavities formed by two fiber end facets with laser machined cavity mirrors offer many advantages for Cavity Quantum Electro-Dynamics (CQED) experiments. Their small mode volume gives rise to large light-matter coupling strengths, and their intrinsic fiber coupling facilitates experimental integration. Such cavities are usually actively locked using piezo-mechanical feedback. Here, we investigate passively stable optical Fabry-Pérot fiber cavities. Two laser-machined optical fibers with coated end-facets are placed inside a ferrule to form a rigid fiber cavity. The tight fit of the ferrule and the fibers transversely align the cavity, which is glued to a fixed longitudinal separation to match resonances at the desired atomic transitions. We show that this mechanically rigid unit is vibrationally stable and that its temperature sensitivity can be used to fine-tune the cavity resonance frequency. Furthermore, we demonstrate self-locking of a cavity with a finesse of approximately 20,000 to a reference laser and analyze its frequency stability.