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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 17 — Sep. 1, 2012
  • pp: 3477–3479

Laser locking to the Hg199 S01P03 clock transition with 5.4×1015/τ fractional frequency instability

J. J. McFerran, D. V. Magalhães, C. Mandache, J. Millo, W. Zhang, Y. Le Coq, G. Santarelli, and S. Bize  »View Author Affiliations

Optics Letters, Vol. 37, Issue 17, pp. 3477-3479 (2012)

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With Hg199 atoms confined in an optical lattice trap in the Lamb–Dicke regime, we obtain a spectral line at 265.6 nm for which the FWHM is 15Hz. Here we lock an ultrastable laser to this ultranarrow S01P03 clock transition and achieve a fractional frequency instability of 5.4×1015/τ for τ400s. The highly stable laser light used for the atom probing is derived from a 1062.6 nm fiber laser locked to an ultrastable optical cavity that exhibits a mean drift rate of 6.0×1017s1 (16.9mHzs1 at 282 THz) over a six month period. A comparison between two such lasers locked to independent optical cavities shows a flicker noise limited fractional frequency instability of 4×1016 per cavity.

© 2012 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(300.6360) Spectroscopy : Spectroscopy, laser
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

ToC Category:

Original Manuscript: May 17, 2012
Manuscript Accepted: July 5, 2012
Published: August 16, 2012

J. J. McFerran, D. V. Magalhães, C. Mandache, J. Millo, W. Zhang, Y. Le Coq, G. Santarelli, and S. Bize, "Laser locking to the 199Hg 1S03P0 clock transition with 5.4 × 10−15/✓τ fractional frequency instability," Opt. Lett. 37, 3477-3479 (2012)

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