Journal article
(Original article)


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


Publication Details
Author(s): von Zanthier J, Becker T, Eichenseer M, Nevsky A, Schwedes C, Peik E, Walther H, Holzwarth R, Reichert J, Udem T, Hänsch T, Pokasov P, Skvortsov MN, Bagayev SN
Journal: Laser Physics
Publisher: MAIK Nauka/Interperiodica (МАИК Наука/Интерпериодика) / Institute of Physics
Publication year: 2001
Volume: 11
Journal issue: 10
Pages range: 1117-1119
ISSN: 1054-660X

Abstract

Single laser-cooled ions stored in radiofrequency traps are the atomic systems which allow the highest resolution in optical or microwave spectroscopy. A narrow transition in such an ion can serve as a reference for a frequency standard of extremely high accuracy and stability. In view of this application we study the 5 S-55 P clock transition in a single trapped In ion at a wavelength of 237 nm [1]. This transition is highly immune to systematic frequency shifts. A frequency control at the millihertz level is expected leading to a residual relative uncertainty at the level of 10. For realizing the standard it is necessary to compare its absolute frequency to other known frequencies, at best to the present primary frequency standard, the cesium atomic clock. We report on the comparison of the In clock transition to a methane-stabilized He-Ne laser at 3.39 μ.m. This laser was calibrated before the measurement 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 clock transition was determined to 1267402452899.92 (0.23) kHz where the accuracy of the measurement is limited by the uncertainty of the He-Ne standard.



How to cite
APA: von Zanthier, J., Becker, T., Eichenseer, M., Nevsky, A., Schwedes, C., Peik, E.,... Bagayev, S.N. (2001). Absolute frequency measurement of the In+ clock transition with a mode-locked femtosecond laser. Laser Physics, 11(10), 1117-1119.

MLA: von Zanthier, Joachim, et al. "Absolute frequency measurement of the In+ clock transition with a mode-locked femtosecond laser." Laser Physics 11.10 (2001): 1117-1119.

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