Absolute Optical Frequency Measurement of the Cesium D1 Line with a Mode-Locked Laser

Th. Udem, J. Reichert, R. Holzwarth, and T. W. Hänsch
Phys. Rev. Lett. 82, 3568 – Published 3 May 1999
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Abstract

We have measured the absolute optical frequency of the cesium D1 line at 335 THz (895 nm). This frequency provides an important link for a new determination of the fine structure constant α. The D1 line has been compared with the fourth harmonic of a methane stabilized He-Ne laser at 88.4 THz ( 3.39μm). To measure the frequency mismatch of 18.39 THz between 4×88.4THz=354THz and the D1 line a frequency comb spanning around 244 000 modes of a Kerr-lens mode-locked laser was used. We find 1 167 688 (81) kHz for the hyperfine splitting of the 6P1/2 state and 335 116 048 807 (41) kHz for the hyperfine centroid from which we derive α1=137.0359924(41).

  • Received 17 December 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.3568

©1999 American Physical Society

Authors & Affiliations

Th. Udem, J. Reichert, R. Holzwarth, and T. W. Hänsch

  • Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

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Vol. 82, Iss. 18 — 3 May 1999

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