First Phase-Coherent Frequency Measurement of Visible Radiation

Physics

Scientific paper

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Scientific paper

We have determined the frequency of the 3P1- 1S0 intercombination transition of atomic 40Ca stored in a magneto-optical trap to be ν = 455 986 240 493.95 kHz with an estimated standard uncertainty of 0.43 kHz \(δν/ν<10-12\) using a phase-coherent optical frequency chain from the Cs atomic clock to the visible. This allows the realization of the SI-unit meter according to its definition by visible radiation with 25-fold reduced uncertainty compared to previous measurements.

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