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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster: Quantum Optics and Photonics II
Q 40.48: Poster
Wednesday, March 8, 2017, 17:00–19:00, P OG2
Asymmetric fiber cavities for quantum opto-mechanics with SiN-membranes — •Jan Petermann1, Tobias Wagner1, Philipp Christoph1, Christoph Becker1, Klaus Sengstock1, Hai Zhong2, Alexander Schwarz2, and Roland Wiesendanger2 — 1Center for Optical Quantum Technologies, Hamburg, Germany — 2Insitute for Applied Physics, Hamburg, Germany
We are currently setting up a quantum hybrid experiment, which aims at coupling a Bose-Einstein condensate to a cryogenically pre-cooled SiN membrane via long-range light interaction. A fiber cavity is used to enhance the coupling between light and membrane by a factor of the finesse. Asymmetric coating of the cavity mirrors enables finite on-resonance reflectivity required to establish a mutual resonant coupling between the atomic sample and the membrane motion. Our results reveal that the on-resonance reflectivity is extremely sensitive to the mode match between fiber- and cavity mode. Best mode match is achieved for plano-concave cavities. Using standard single mode fibers with mode a field diameter of 5.2 µ m, we derive an optimal mode match for a radius of curvature close to 50 µ m and a cavity length of L ≈ 25 µ m. We optimize depth and width of our laser machined gaussian mirror profiles by numerical simulations and achieve values for the on-resonance power reflectivity ideally suited for our envisaged quantum hybrid system.