Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects: QED III

Q 66.1: Group Report

Friday, March 4, 2016, 11:00–11:30, f442

High finesse Fabry-Perot fiber resonators for efficient photonic interfacing: optimal mode-matching and stabilization — Jose Gallego, Sutapa Ghosh, Seyed Khalil Alavi, Wolfgang Alt, Miguel Martinez-Dorantes, Dieter Meschede, and •Lothar Ratschbacher — University of Bonn

In recent years optical Fabry-Perot fiber resonators have been used in an increasing number of scientific applications. Due to their small resonator mode volume and their intrinsic fiber coupling these resonators, for example, are employed as efficient interfaces between single optical photons and a wide range of quantum systems, including cold atoms, ions and solid state emitters, as well as in quantum opto-mechanical experiments. Here we address some important practical questions that arise during the experimental implementation of high finesse fiber cavities: How can optimal fiber cavity alignment be achieved and how can the individual mode matching efficiencies be characterized? How should optical fiber cavities be constructed and to fulfill their potential for miniaturization and integration into robust devices? To answer the first question, we present an analytic mode matching calculation that relates the alignment dependent fiber-to-cavity mode-matching efficiency to the dip in the reflected light power at the cavity resonance. The latter question we explore by investigating a novel, intrinsically rigid fiber cavity design that makes use of the high passive stability of a monolithic cavity spacer and employs thermal self-locking and external temperature tuning. Finally, we also discuss the issue of fiber-generated background photons in fiber Fabry-Perot cavities.