Optical frequency metrology

@article{Udem2002OpticalFM,
  title={Optical frequency metrology},
  author={T. Udem and R. Holzwarth and T. H{\"a}nsch},
  journal={Nature},
  year={2002},
  volume={416},
  pages={233-237}
}
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… Expand
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