Stuttgart 2012 – wissenschaftliches Programm
Q 3.5: Vortrag
Montag, 12. März 2012, 11:30–11:45, V47.02
Interrogation laser with 5× 10−16 instability for a magnesium optical lattice clock — •Andre Pape, Steffen Rühmann, Temmo Wübbena, André Kulosa, Hrishikesh Kelkar, Dominika Fim, Klaus Zipfel, Wolfgang Ertmer, and Ernst M. Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
Optical clocks revolutionized the field of time and frequency metrology and are outperforming today’s best microwave clocks. Magnesium (Mg) is an attractive candidate for a neutral atom optical clock, due to its low sensitivity to blackbody radiation. For interrogation of the narrow atomic transitions in optical clocks, lasers with typically subhertz linewidths are essential. We present an ultrastable laser system with 5× 10−16 instability for the future spectroscopy of the narrow 1S0 → 3P0 clock transition at 458 nm on an ensemble of 24Mg atoms confined to an optical lattice at the magic wavelength. The laser system is based on a diode laser at 916 nm stabilized to an ultrastable optical resonator exhibiting a thermal noise floor of 3 × 10−16 . For atomic spectroscopy, the light is resonantly frequency doubled (SHG). We give a detailed presentation of our clock laser system and discuss relevant noise sources, especially the influence of the SHG on laser stability.