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Nature. 2002 Mar 14;416(6877):233-7.

Optical frequency metrology.

Author information

  • 1Max-Planck-Institut für Quantenoptik, Garching, Germany. thomas.udem@mpq.mpg.de

Abstract

Extremely narrow optical resonances in cold atoms or single trapped ions can be measured with high resolution. A laser locked to such a narrow optical resonance could serve as a highly stable oscillator for an all-optical atomic clock. However, until recently there was no reliable clockwork mechanism that could count optical frequencies of hundreds of terahertz. Techniques using femtosecond-laser frequency combs, developed within the past few years, have solved this problem. The ability to count optical oscillations of more than 1015 cycles per second facilitates high-precision optical spectroscopy, and has led to the construction of an all-optical atomic clock that is expected eventually to outperform today's state-of-the-art caesium clocks.

PMID:
11894107
[PubMed]
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