Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.64: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Progress Report of an ultra-stable cavity for an Al+ optical clockSana Amairi Pyka1, •Kornelius Jakobsen1, Nils Scharnhorst1, Stephan Hannig1, Ian D. Leroux1, and Piet O. Schmidt1,21QUEST Institute, Physikalisch Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibnitz-Universität Hannover, 30167 Hannover, Germany

We present the current status of the reference cavity for the clock laser of our aluminium ion frequency standard. A 1070 nm laser is stabilized to a 39.5  cm long cavity made of ultra-low expansion glass and is thereafter frequency-doubled twice to achieve the transition wavelength of 267  nm. The cavity has an estimated thermal noise limit of 7· 10−17 in 1 s. Despite its length, the system exhibits a very low sensitivity to vibrations of less than 10−11/m s−2 in all three directions. We present an evaluation of possible performance-limiting effects, such as residual amplitude noise and intensity stability of the laser light inside the cavity. These results are complemented by a comparison with other clock cavities at PTB. The evaluation shows that such long cavities are suitable for sub-Hertz spectroscopy at optical frequencies.

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DPG-Physik > DPG-Verhandlungen > 2015 > Heidelberg