Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.20: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Fiber based Mode Matching for Fabry-Pérot Cavities — •Pritom Paul, Timon Eichhorn, and David Hunger — Physikalisches Institut (PHI), Karlsruher Institut für Technologie, Wolfgang-Gaede-Str.1, 76131 Karlsruhe, Germany.

Fiber Fabry-Pérot Cavities(FFPC) with micro mirrors fabricated on the end facets of optical fibers combine a high finesse with a small mode volume and full tunability [1]. Due to these properties, FFPCs can be beneficially used e.g. for sensing of nanoparticles, cavity optomechanics, and for solid-state based quantum information. For all applications, efficient excitation and collection of light in the cavity mode with a single mode fiber is desirable. However, restricted spatial mode matching substantially lowers the overall coupling efficiency for fully fiber-based FFPCs. To overcome this problem, the aim of this work is to fabricate a fiber based mode matching assembly. As it was shown for fiber cavities targeting large mirror separations e.g. for ion trap experiments, splicing together a single mode, a multimode and a graded-index fiber can serve as mode matching optics [2]. Here, we adapt this approach for FFPC with minimized mode volume and mode cross section as desired for e.g. experiments with solid-state quantum emitters. We report the current status of the project.

[1] Hunger, D. et al. A Fiber Fabry-Pérot with High Finesse, New Journal of Physics 12, 065038 (2010).

[2] Gulati, G K. et al. Fiber Cavities with Integrated Mode Matching Optics, Scientific Reports 7, 5556 (2017)