Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.4: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Optical Fiber Link via Telecommunication Networks — •Nivedya Valappol1, Tjeerd Pinkert2, Oliver Boll1, Fred Bosveld3, Elwin Dijck1, Kjeld Eikema2, Klaus Jungmann1, Jeroen Koelemeij2, Wim Ubachs2, and Lorenz Willmann1 — 1University of Groningen, Groningen, NL — 2Vrije Universiteit Amsterdam, Amsterdam, NL — 3KMNI, De Bilt, NL
Time and frequency distribution over existing communication infrastructure has different applications. A telecommunication channel on a SURFnet fiber link has been established between the VU Amsterdam and Groningen. It is used to transfer stability and accuracy of narrow band lasers (1Hz) in order to compare high precision experiments such as clocks (Al+, Ra+) at the two locations. The stability of the 2×317 km underground optical fiber link has been characterized. The long term frequency stability determined with a 3kHz laser linewidth of 2×1014 at 5×102-5×103s can be explained by thermal temperature fluctuations in the ground. This accuracy surpassing, e.g. the satellite based GPS system, can be exploited in superior navigation systems. The full potential with lasers of 1Hz linewidth will permit tests of fundamental physics, such as Atomic Parity Violation measurements, in spatially separated precision experiments.