Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Precision spectroscopy of atoms and ions VI (with Q)
A 43.1: Hauptvortrag
Freitag, 22. März 2013, 11:00–11:30, B 305
Accurate, stable, transportable: lattice clocks at PTB — •Christian Lisdat, Stephan Falke, Nathan Lemke, Thomas Middelmann, Stefan Vogt, Sebastian Häfner, and Uwe Sterr — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
After an introduction to the ideas of optical clocks in general and lattice clocks in particular we will present
recent improvements on the strontium lattice clocks of PTB. The typical benchmarks of clocks are their accuracy and
stability – where substantial improvements have been achieved by the highly accurate evaluation of the dominating source of uncertainty of Sr lattice clocks [1] and the application of an extremely coherent laser [2] for the interrogation of the atomic clock transition in strontium. Now, PTB’s laboratory lattice clock is expected to achieve its uncertainty of 4 × 10−17 after an averaging time of less than 200 s. We will use our clock for measurements aiming at posing improved limits on the time variation of fundamental constants.
So far these formidable measurement devices are only available in few laboratories in the world. By building a
transportable lattice clock we want to develop an instrument for frequency comparisons, tests of e.g. the
gravitational redshift or applications like relativistic geodesy with high temporal resolution.
[1] T. Middelmann et al.: High accuracy correction of blackbody radiation shift in an optical lattice
clock; Phys. Rev. Lett in press (2012).
[2] T. Kessler et al.: A sub-40 mHz linewidth laser based on a silicon single-crystal optical cavity; Nature Photonics 6, 687–692 (2012).