Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.47: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
Interrogating optical clocks beyond the coherence limit of the clock laser — •Roman Schwarz1, Ali Al-Masoudi1, Sören Dörscher1, Marcin Bober2, Richard Hobson3, Uwe Sterr1, and Christian Lisdat1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — 2Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland — 3National Physical Laboratory, Hampton Road, Teddington, Middlesex, UK, TW11 0LW
The performance of optical clocks benefit from ultra stable laser systems enabling several seconds of interrogation time. For longer interrogation times, the coherence time of the clock laser becomes one limiting factor. Even with state-of-the-art laser systems, the natural linewidth of the clock transition has not been reached yet. Here we present a novel interrogation method, which allows interrogation times beyond the coherence time of the laser. The proposed technique utilizes a correlated interrogation sequence of two atomic clocks with a single clock laser to resolve the phase ambiguity occurring for Ramsey interrogation beyond the coherence limit of the interrogation laser. Additionally, probing the atomic ensemble for several seconds, effects such as Raman scattering induced by the intense optical lattice may cause a frequency shift and limit the coherence time. This work is supported by QUEST, the DFG within CRC 1128 (geo- Q A03), CRC 1227 (DQ-mat B02) and RTG 1729.