Measurement of an Optical Frequency and the Speed of Light
- 17 July 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 29 (3), 189-192
- https://doi.org/10.1103/physrevlett.29.189
Abstract
We report the measurement of the frequency of the 633-nm red laser line. This is the first measurement of an optical frequency in the visible range without reference to the speed of light or to a measured wavelength. Combination of the optical frequency with the known wavelength yields to an accuracy higher than previously known. This method demonstrates the practicability of a single-standard time-length measurement system unified via a defined value of the speed of light.
Keywords
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