Mainz 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 11: Precision Measurements and Metrology: Optical Clocks (with Q)
A 11.5: Vortrag
Montag, 6. März 2017, 18:00–18:15, P 104
A Sr lattice clock with 6·10−17/√τ/s frequency instability — •Roman Schwarz1, Sören Dörscher1, Ali Al-Masoudi1, Sofia Herbers1, Dan-Gheorghita Matei1, Thomas Legero1, Sebastian Häfner1, Christian Grebing1, Erik Benkler1, Wei Zhang2, Lindsay Sonderhouse2, John M. Robinson2, Jun Ye2, Fritz Riehle1, Uwe Sterr1, and Christian Lisdat1 — 1Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig — 2JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA
Optical clocks represent the forefront of frequency metrology enabling applications in relativistic geodesy, tests of fundamental physics, and the search for dark matter. As their systematic uncertainty reaches the low 10−18 regime, reducing their frequency instability becomes even more important in order to exploit their potential. Here, we report on recent improvements of the Sr lattice clocks at PTB by phase-locking the interrogation laser to cryogenic Si resonators at 194 THz. Frequency instabilities of 6 · 10−17 (τ/s)−1/2 are inferred from clock self-comparisons.
This work is supported by QUEST, the DFG within CRC 1128 (geo-Q), CRC 1227 (DQ-mat) and RTG 1729, EMPIR within OC18. The EMPIR initiative is co-funded by the European Union’s Horizon 2020 research and innovation program and the EMPIR Participating States.