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Optical frequency metrology

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Optical frequency metrology

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  • Author: Th. Udem, R. Holzwarth, & T. W. Hänsch
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.

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