Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 104, Issue 4, Pages 741-745Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-011-4652-7
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Funding
- Centre of Quantum Engineering and Space-Time Research (QUEST)
- European Community [217257]
- ESA
- DLR
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We present the setup and test of a transportable clock laser at 698 nm for a strontium lattice clock. A masterslave diode laser system is stabilized to a rigidly mounted optical reference cavity. The setup was transported by truck over 400 km from Braunschweig to Dusseldorf, where the cavity-stabilized laser was compared to a stationary clock laser for the interrogation of ytterbium (578 nm). Only minor realignments were necessary after the transport. The lasers were compared using a Ti:Sapphire frequency comb as a transfer oscillator. The generated virtual beat showed a combined linewidth below 1 Hz (at 1156 nm). The transport back to Braunschweig did not degrade the laser performance, as was shown by interrogating the strontium clock transition.
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