Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.47: Poster
Thursday, March 26, 2015, 17:00–19:00, C/Foyer
Realizing a sub-kelvin membrane-in-the-middle fiber cavity — •Hai Zhong, Philipp Christoph, Andreas Bick, Christina Staarmann, Jannes Heinze, Ortwin Hellmig, Christoph Becker, Alexander Schwarz, Klaus Sengstock, and Roland Wiesendanger — Zentrum für Optische Quantentechnologien, Universität Hamburg, Deutschland
A fiber cavity based membrane-in-the-middle (MiM) setup has great potential to cool down a massive mechanical oscillator, e.g., a Si3N4 membrane to its quantum mechanical ground state via hybrid optomechanical cooling schemes. Moreover, its miniaturized size is compatible with the limited space available in cryogenic set-ups. Our dilution fridge will be used to precool the membrane to sub-kelvin temperatures before starting optomechanical cooling. The MiM set-up consists of two reflective micro-mirrors formed by the end of two opposing optical fibers. Each fiber can be adjusted using home-built 5-axis goniometer stages, powered by piezo-electric motors [1]. The membrane can be inserted in situ by an exchangeable shuttle with the possibility of being excited via a piezoelectric element. Here we report on the performance of the MiM set-up in the cryogenic environment, e.g., cooling power, base temperature and fiber alignment. Our next step is to couple the sub-kelvin cold membrane with 87Rb ultracold atoms in an optical lattice. This work is supported by the "GRK 1355".
[1] H. Zhong, et al., Rev. Sci. Instrum. 85, 045006 (2014).