Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology II
Q 14.8: Vortrag
Dienstag, 9. März 2010, 16:00–16:15, A 310
Remote characterization of ultrastable optical frequencies via a 73 km long telecommunication fiber link — •Andre Pape1, Jan Friebe1, Osama Terra2, Matthias Riedmann1, Temmo Wübbena1, André Kulosa1, Sana Amairi1, Hrishikesh Kelkar1, Ernst-Maria Rasel1, Wolfgang Ertmer1, Katharina Predehl2, Thorsten Feldmann2, Thomas Legero2, Burghard Lipphardt2, Gesine Grosche2, and Harald Schnatz2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Dissemination and remote comparison of ultrastable optical frequencies is an important research field, since the complexity of optical clocks does not allow for transportation today. We implemented a 73 km long optical telecommunication fiber link between the Physikalisch-Technische Bundesanstalt (PTB, Braunschweig) and the Institute of Quantum Optics (IQ, Hannover). We report on a remote characterization of ultrastable lasers on the 10−15 level in fractions of a second.
We additionally used this fiber link to characterize the magnesium optical frequency standard at the IQ against an ultrastable optical frequency, a hydrogen maser and a Cs fountain clock at PTB and report on an improved frequency measurement. The Mg optical frequency standard is based on cold free falling ensembles of neutral Mg atoms interrogated on the narrow 1S0 → 3P1 intercombination transition using the Ramsey-Bord é interferometer scheme with subsequent detection using a MOT in the metastable 3PJ → 3DJ′ system.