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Femtosecond optical frequency combs

  • Th. Udem
  • R. Holzwarth
  • Th. Hänsch
Open Access
Review

Abstract

A laser frequency comb allows the conversion of the very rapid oscillations of visible light of some 100’s of THz down to frequencies that can be handled with conventional electronics. This capability has enabled the most precise laser spectroscopy experiments yet that allowed to test quantum electrodynamics, to determine fundamental constants and to search for possible slow changes of these constants. Using an optical frequency reference in combination with a laser frequency comb has made it possible to construct all optical atomic clocks, that are now outperforming even the best cesium atomic clocks. In future direct frequency comb spectroscopy might enable high resolution laser spectroscopy in the extreme ultraviolet for the first time. Frequency combs are also used to calibrate astronomical spectrographs and might reach an accuracy that is sufficient to observe the expansion of the universe in real time.

Keywords

European Physical Journal Special Topic Optical Frequency Fundamental Constant Frequency Comb Atomic Clock 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2009

Authors and Affiliations

  • Th. Udem
    • 1
  • R. Holzwarth
    • 1
  • Th. Hänsch
    • 1
  1. 1.Max-Planck-Institute für QuantenoptikGarchingGermany

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