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Optics Letters

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  • Vol. 25, Iss. 23 — Dec. 1, 2000
  • pp: 1729–1731

Absolute frequency measurement of the In+ clock transition with a mode-locked laser

J. von Zanthier, Th. Becker, M. Eichenseer, A. Yu. Nevsky, Ch. Schwedes, E. Peik, H. Walther, R. Holzwarth, J. Reichert, Th. Udem, T. W. Hänsch, P. V. Pokasov, M. N. Skvortsov, and S. N. Bagayev  »View Author Affiliations


Optics Letters, Vol. 25, Issue 23, pp. 1729-1731 (2000)
http://dx.doi.org/10.1364/OL.25.001729


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Abstract

The absolute frequency of the In+ 5s2 1S05s5p 3P0 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 1S03P0 transition with a methane-stabilized HeNe 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 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

© 2000 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6520) Spectroscopy : Spectroscopy, trapped ion

Citation
J. von Zanthier, Th. Becker, M. Eichenseer, A. Yu. Nevsky, Ch. Schwedes, E. Peik, H. Walther, R. Holzwarth, J. Reichert, Th. Udem, T. W. Hänsch, P. V. Pokasov, M. N. Skvortsov, and S. N. Bagayev, "Absolute frequency measurement of the In+ clock transition with a mode-locked laser," Opt. Lett. 25, 1729-1731 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-23-1729


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