Phys. Rev. A 60, R753 - R756 (1999)2.3-kHz two-photon Ramsey fringes at 30 THz |
L. F. Constantin, R. J. Butcher *, P. E. Durand †, A. Amy-Klein ‡, and Ch. Chardonnet
Laboratoire de Physique des Lasers, UMR 7538 CNRS, Université Paris 13, avenue J.-B. Clément, 93430 Villetaneuse, France
Received 15 April 1999
This paper reports observations of Ramsey fringes on a 10.6-μm two-photon transition of SF6. We used two interaction zones separated by 8 cm and observed fringes of frequency 2.3 kHz. The experimental apparatus might be adapted to increase the resolution by an order of magnitude. The present 10-μm secondary frequency standards based on the CO2 laser locked onto a saturated absorption resonance of OsO4 reach an accuracy of a few 10-13. This work contributes to the current attempts to build a new generation of frequency standards with a potential accuracy in the 10-14–10-15 range.
©1999 The American Physical Society
URL: http://link.aps.org/abstract/PRA/v60/pR753
DOI: 10.1103/PhysRevA.60.R753
PACS: 33.80.-b, 42.62.Fi, 06.20.-f, 07.60.Ly
* Permanent address: The Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom. Electronic address: rjb2@cus.cam.ac.uk
† Present address: LETM, Université de Bretagne Sud, 4 rue Jean Zay, F-56000 Lorient, France. Electronic address: Pierre-Emmanuel.Durand@univ-ubs.fr
‡ Electronic address: amy@galilee.univ-paris13.fr
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