Ultra-stable clock laser system development towards space applications

Research output: Contribution to journalArticle

Authors

  • Dariusz Swierad
  • Sebastian Häfner
  • Stefan Vogt
  • Christian Lisdat
  • Uwe Sterr
  • Sébastien Bize
  • Jérôme Lodewyck
  • Rodolphe Le Targat
  • Ernst Maria Rasel
  • André Kulosa
  • Sebastian Bode
  • David Holleville
  • Bertrand Venon

Colleges, School and Institutes

External organisations

  • Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany
  • LNE-SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, 61 Avenue de l’Observatoire, 75014 Paris, France
  • Institute of Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany

Abstract

The increasing performance of optical lattice clocks has made them attractive for scientific applications in space and thus has pushed the development of their components including the interrogation lasers of the clock transitions towards being suitable for space, which amongst others requires making them more power efficient, radiation hardened, smaller, lighter as well as more mechanically stable. Here we present the development towards a space-compatible interrogation laser system for a strontium lattice clock constructed within the Space Optical Clock (SOC2) project where we have concentrated on mechanical rigidity and size. The laser reaches a fractional frequency instability of 7.9 × 10^(−16) at 300 ms averaging time. The laser system uses a single extended cavity diode laser that gives enough power for interrogating the atoms, frequency comparison by a frequency comb and diagnostics. It includes fibre link stabilisation to the atomic package and to the comb. The optics module containing the laser has dimensions 60 × 45 × 8 cm3; and the ultra-stable reference cavity used for frequency stabilisation with its vacuum system takes 30 × 30 × 30 cm3. The acceleration sensitivities in three orthogonal directions of the cavity are 3.6 × 10^(−10)/g, 5.8 × 10^(−10)/g and 3.1 × 10^(−10)/g, where g ≈ 9.8 m/s2 is the standard gravitational acceleration.

Details

Original languageEnglish
Article number33973
JournalScientific Reports
Volume6
Early online date26 Sep 2016
Publication statusE-pub ahead of print - 26 Sep 2016

Keywords

  • Optical Clock, Optical resonators, space, Cold atoms