Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.74: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Ultrastable clock laser for a magnesium frequency standard — •Steffen Rühmann, André Kulosa, Dominika Fim, Klaus Zipfel, Steffen Sauer, Birte Lampmann, Leonie Theis, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
State-of-the-art frequency standards based on ultranarrow optical transitions enable new applications, i.e. in geodesy, navigation and fundamental physics. Here timescales of applications are mainly limited due to the short term stability of the frequency standard which is mainly given by the interrogation oszillator.
At the IQ Hannover we are currently setting up a frequency standard based on neutral magnesium atoms trapped in an optical lattice at the predicted magic wavelength which promises to be a good candidate as a clock element due to its low sensitivity to black body radiation. For interrogation we built up a laser system based on an 10 cm long ULE-spacer contacted with fused silica mirrors at room temperature. This resonator is housed in a vacuum chamber which ist isolated from thermal and acoustic fluctuations. We reach an instability of 5 × 10−16 in 1 s with a calculated thermal noise limit of 3 × 10−16. We give details in the performance of the clock laser system and the main contributions to its limits.