Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 45: Precision Measurement and Metrology 2
Q 45.3: Vortrag
Donnerstag, 17. März 2011, 11:15–11:30, HÜL 386
Development of a cryogenic sub-Hz laser system for optical clocks — •Christian Hagemann1, Thomas Kessler1, Thomas Legero1, Uwe Sterr1, Fritz Riehle1, Michael J. Martin2, and Jun Ye2 — 1Physikalisch-Technische Bundesanstalt (PTB) and Centre for Quantum Engineering and Space-Time Research (QUEST), Bundesallee 100, 38116 Braunschweig, Germany — 2JILA, NIST and University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA
Today’s best optical clocks are outperforming the best primary Cs frequency standards. The performance of such clocks is limited by the frequency stability of the lasers that are used to interrogate the atomic or ionic quantum transition used as the pendulum of the atomic clock. In such setups an interrogation laser is locked to a high performance cavity for frequency stabilization.
In the Centre of Excellence (QUEST) we have developed a novel single-crystal silicon cavity operated at a temperature of 120 K. We will present the current setup, comprising the cryostat and the laser system. We have observed a fractional instability of a few times 10−15 (1 s) limited by the thermal noise floor of the ULE type reference laser. The impact of possible noise sources such as mechanical vibrations, temperature drifts and thermal noise on the frequency stability will be discussed.