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Optics Letters

Optics Letters

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  • Vol. 25, Iss. 21 — Nov. 1, 2000
  • pp: 1603–1605

Improved short-term stability of optical frequency standards: approaching 1 Hz in 1 s with the Ca standard at 657 nm

C. W. Oates, E. A. Curtis, and L. Hollberg  »View Author Affiliations


Optics Letters, Vol. 25, Issue 21, pp. 1603-1605 (2000)
http://dx.doi.org/10.1364/OL.25.001603


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Abstract

For a neutral 40Ca-based optical frequency standard we report a fractional frequency instability of 4 × 10-15 in 1 s, which represents a fivefold improvement over existing atomic frequency standards. Using the technique of optical Bordé–Ramsey spectroscopy with a sample of 107 trapped atoms, we have resolved linewidths as narrow as 200 Hz (FWHM). With colder atoms this system could potentially achieve an instability as low as 2 × 10-16 in 1 s. Such low instabilities are important for frequency standards and precision tests of fundamental physics.

© 2000 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(140.3320) Lasers and laser optics : Laser cooling
(300.6320) Spectroscopy : Spectroscopy, high-resolution

Citation
C. W. Oates, E. A. Curtis, and L. Hollberg, "Improved short-term stability of optical frequency standards: approaching 1 Hz in 1 s with the Ca standard at 657 nm," Opt. Lett. 25, 1603-1605 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-21-1603


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