Frequency Measurements of Superradiance from the Strontium Clock Transition
Open Access
- 9 May 2018
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review X
- Vol. 8 (2), 021036
- https://doi.org/10.1103/physrevx.8.021036
Abstract
We present the first characterization of the spectral properties of superradiant light emitted from the ultranarrow, 1-mHz-linewidth optical clock transition in an ensemble of cold atoms. Such a light source has been proposed as a next-generation active atomic frequency reference, with the potential to enable high-precision optical frequency references to be used outside laboratory environments. By comparing the frequency of our superradiant source to that of a state-of-the-art cavity-stabilized laser and optical lattice clock, we observe a fractional Allan deviation of at 1 s of averaging, establish absolute accuracy at the 2-Hz ( fractional frequency) level, and demonstrate insensitivity to key environmental perturbations.
Keywords
Funding Information
- National Science Foundation (PHY 1734006)
- Defense Advanced Research Projects Agency
- National Institute of Standards and Technology
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