Measurement of an Optical Frequency and the Speed of Light

Details Measurement of an Optical Frequency and the Speed of Light Measurement of an Optical Frequency and the Speed of Light

Jul 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972phrvl..29..189b&link_type=abstract

Physical Review Letters, vol. 29, Issue 3, pp. 189-192

Physics

28

Scientific paper

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 c 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.

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