This work describes the coupling of a single nitrogen-vacancy (NV) center in diamond to a fiber-based Fabry-Perot cavity. To realize the cavities, concave imprints on fiber facets are produced by laser machining or focused ion beam milling and subsequently coated with a highly reflective mirror-stack. Nanodiamonds containing single NV centers are incorporated into cavities, that consist either of one plane mirror and one fiber mirror or of two fiber mirrors. Characterizing both the emission into free-space and the cavity-coupled emission of the very same NV center allows to demonstrate a cavity-enhanced emission: 2-4% of the total emission of the NV center is directed into the cavity mode with a linewidth of approximately 10 GHz. We thereby have realized a tunable narrow-band single photon source. Starting from a master equation approach a rate equation model is deduced that provides insights into the underlying physical processes: the emitter-cavity coupling leads to phonon induced off-resonant channeling of the emission into the narrow cavity mode. The measurements of the cavity emission rate at different wavelengths are well reproduced by this model. The results of this work are promising for future applications in quantum information science such as realization of a source of indistinguishable photons, cavity enhanced spin read-out of the NV center and realization of a spin-photon interface for use in quantum networks.
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