Towards a Strontium Beam Optical Reference Based on the 1S0 → 3P1 Intercombination Line on a Sounding Rocket

F.B. Gutsch1, O. Fartmann1, C.L. Zimmermann1, V. Schkolnik1, A. Peters1, M. Krutzik1, F. Böhle2, M. Lezius2, R. Holzwarth2, A. Bawamia3, C. Pyrlik3, A. Wicht3

Published in:

Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC), Orlando, USA, Apr. 14-18 (2019).

Copyright © 2019 IEEE - All rights reserved. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.


Within the OPUS collaboration, we develop optical frequency references based on spectroscopy of the 1S0 → 3P1 intercombination line of 88Sr at 689 nm in thermal and laser-cooled strontium beams for operation on sounding rockets. One main objective is to identify suitable experimental setups and core components for a compact and robust strontium beam clock, providing a stepping stone for future spaceborne devices. Recent results demonstrate successful laser stabilization to the intercombination line in a thermal beam breadboard setup.

1 Humboldt-Universität zu Berlin, Germany
2 Menlo Systems GmbH, Martinsried, Germany
3 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany


Strontium; Beam Standard; 689nm; Atomic Beams; Optical Frequency References; Ramsey-Bordé; Electron-Shelving Detection.