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Frequency measurement of a CH4 hyperfine line at 88 THz/`optical clock'

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4 Author(s)
C. O. Weiss ; Physikalisch-Technishe Bundesanstalt, Braunschweig, West Germany ; G. Kramer ; B. Lipphardt ; E. Garcia

A frequency-measurement chain was used to measure the frequency of a hyperfine line of the ν3P(7) CH4 multiplet, which was resolved by a linear optical Ramsey resonance technique. A frequency of 88, 376, 181, 599.7±1 kHz is found. The Ramsey experiment was used as a clock; to ~100 s the stability of this optical clock is equal to a high-performance commercial Cs clock. It is concluded that the frequency division necessary for optical transitions to be used as a clock does not necessarily introduce the noise and errors which would a priori rule out optical transitions as candidates for good clocks

Published in:

IEEE Journal of Quantum Electronics  (Volume:24 ,  Issue: 10 )