Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology II
Q 14.1: Group Report
Tuesday, March 9, 2010, 14:00–14:30, A 310
Dissemination of reference frequencies via optical telecommunication fiber — •Gesine Grosche1, Osama Terra1, Katharina Predehl1,2, Andre Pape3, Jan Friebe3, Matthias Riedmann3, Temmo Wübbena3, Janis Alnis2, Ronald Holzwarth2, Thomas Legero1, Burghard Lipphardt1, Thomas Udem2, Ernst Rasel3,4, Uwe Sterr1,4, and Harald Schnatz1,4 — 1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig — 2Max-Planck-Institut für Quantenoptik (MPQ), Garching — 3Institut für Quantenoptik (IQ), LUH, Hannover — 4QUEST, Hannover/ Braunschweig
Optical frequency references have achieved an unprecedented accuracy better than 10−16[1]. They are a formidable tool for precision experiments, since frequency is by far the most precisely measurable quantity. Many of these experiments require the comparison of frequencies between different sites. We present the current status of our frequency dissemination work using optical fibers. We achieved a relative accuracy of 10−19 for an optical frequency transmission over 146 km [2,3]. With a reference frequency delivered by fiber from PTB, Braunschweig, to IQ, Hannover, we optimised optical clock lasers on-line [4] and performed a remote frequency measurement of the Mg clock transition. Now a German-wide fiber network (IQ, MPQ, PTB...) is being implemented [5], and we explore how to distribute frequencies to many users simultaneously [6]. [1] Chou et al. arXiv:0911.4527v1 (2009) [2] Grosche et al. Opt. Lett. 34, 2270 (2009) [3] Terra et al. Appl. Phys. B 97, 541 (2009) [4] Pape et al. arXiv 0908.4238 (2009) [5] Predehl et al. CLEO (2009) [6] Grosche, DPMA 10 2008 062 139 (2008)