Absolute frequency measurement of the In+ clock transition with a mode-locked laser |
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Authors: | von Zanthier J Becker T Eichenseer M Nevsky A Y Schwedes C Peik E Walther H Holzwarth R Reichert J Udem T Hänsch T W Pokasov P V Skvortsov M N Bagayev S N |
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Affiliation: | Max-Planck-Institut für Quantenoptik and Sektion Physik der Ludwig-Maximilians-Universit?t München, 85748 Garching, Germany. |
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Abstract: | The absolute frequency of the In(+) 5s(2) (1)S(0)5s5p (3)P(0) clock transition at 237 nm was measured with an accuracy of 1.8 parts in 10(13). Using a phase-coherent frequency chain, we compared the (1)S(0)(3)P(0) transition with a methane-stabilized HeNe laser at 3.39 mum, which was calibrated against an atomic cesium fountain clock. A frequency gap of 37 THz at the fourth harmonic of the HeNe standard was bridged by a frequency comb generated by a mode-locked femtosecond laser. The frequency of the In(+) clock transition was found to be 1 267 402 452 899.92 (0.23) kHz, the accuracy being limited by the uncertainty of the HeNe laser reference. This result represents an improvement in accuracy of more than 2 orders of magnitude over previous measurements of the line and now stands as what is to our knowledge the most accurate measurement of an optical transition in a single ion.s. |
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