Abstract

The absolute frequency of the In+ 5s2 S105s5p P30 clock transition at 237 nm was measured with an accuracy of 1.8 parts in 1013. Using a phase-coherent frequency chain, we compared the S10P30 transition with a methane-stabilized He–Ne laser at 3.39 µm, which was calibrated against an atomic cesium fountain clock. A frequency gap of 37 THz at the fourth harmonic of the He–Ne 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 He–Ne 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

© 2000 Optical Society of America

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