Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.37: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Towards laser-machined optical cavities — •Manuel Uphoff, Manuel Brekenfeld, Johannes Lang, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

Single atoms strongly coupled to fiber-based, high-finesse optical cavities are a promising system for applications in quantum information processing. Fiber-based cavities allow for small mode volumes and a small system size thereby improving the scalability compared to conventional Fabry-Pérot resonators. The Bragg mirrors are directly coated onto the end facets of the fibers. This requires concave structures on the end facets. Their surface has to be spherical over a large area with the surface roughness as low as possible. We report on the fabrication of such fiber ends, machined with a CO₂-laser at a wavelength of 9.3 µ m. This new wavelength enables unprecedented structure sizes approaching the diameter of the fiber. We achieve a residual surface roughness well below 0.3 nm rms and investigate effects of the laser polarization on the eccentricity of the surface. We plan to fabricate cavities from these fibers that will enable strong atom-cavity coupling. The progress towards this goal will be discussed.