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Optical frequency measurements using fs-comb generators

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7 Author(s)
Schnatz, H. ; Phys. Tech. Bundesanstalt, Braunschweig, Germany ; Lipphardt, B. ; Degenhardt, C. ; Peik, E.
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We have used a Ti:Sapphire-based fs-comb generator to measure the frequencies of several optical frequency standards available at PTB. The frequency values for HeNe- and frequency-doubled Nd:Yag lasers stabilized to iodine hyperfine transitions as well as the frequencies of the 1S0-3P1 transition of 40Ca at 657.5 nm (456 THz) and the 2S12/-2D32/ transition of 171Yb+ at 435.5 nm (688 THz) are presented. Comparing our results with previously published data for the frequency variation of transitions of the Hg+ ion and H atom, we have derived a new upper limit of the variation of the fine structure constant α.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:54 ,  Issue: 2 )