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The measurement of large optical frequency differences and the design of a new type of frequency chain
Description
We have used optical frequency interval dividers, optical frequency comb generators and mode-locked lasers to measure large optical frequency differences of up to 45.2 THz between laser frequencies. We have shown that the modes of a mode-locked laser are distributed uniformly in frequency space within the experimental limit of 3.0 parts in 10/sup 17/ and that the mode separation equals the pulse repetition rate within the experimental limit of 6.0 parts in 10/sup 16/. We applied these techniques to determine the absolute frequencies of the cesium D/sub 1/ line at 335 THz (895 nm), the hydrogen 1S-2S transition at 2466 THz (121 nm) and the frequency of a methane stabilized He-Ne laser at 88.4 THz (3.39 /spl mu/m) as well as the isotope shift of the 1S-2S frequency.
Journal
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- Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH36313)
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Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH36313) 2 620-625, 2003-01-22
IEEE
