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Title:
Speed of Light from Direct Frequency and Wavelength Measurements of the Methane-Stabilized Laser
Authors:
Evenson, K. M.; Wells, J. S.; Petersen, F. R.; Danielson, B. L.; Day, G. W.; Barger, R. L.; Hall, J. L.
Affiliation:
AA(Quantum Electronics Division, National Bureau of Standards, Boulder, Colorado 80302), AB(Quantum Electronics Division, National Bureau of Standards, Boulder, Colorado 80302), AC(Quantum Electronics Division, National Bureau of Standards, Boulder, Colorado 80302), AD(Quantum Electronics Division, National Bureau of Standards, Boulder, Colorado 80302), AE(Quantum Electronics Division, National Bureau of Standards, Boulder, Colorado 80302), AF(National Bureau of Standards, Boulder, Colorado 80302), AG(National Bureau of Standards, Boulder, Colorado 80302)
Publication:
Physical Review Letters, vol. 29, Issue 19, pp. 1346-1349 (PhRvL Homepage)
Publication Date:
11/1972
Origin:
APS
DOI:
10.1103/PhysRevLett.29.1346
Bibliographic Code:
1972PhRvL..29.1346E

Abstract

The frequency and wavelength of the methane-stabilized laser at 3.39 μm were directly measured against the respective primary standards. With infrared frequency synthesis techniques, we obtain ν=88.376 181 627(50) THz. With frequency-controlled interferometry, we find λ=3.392 231 376(12) μm. Multiplication yields the speed of light c=299 792 456.2(1.1) m/sec, in agreement with and 100 times less uncertain than the previously accepted value. The main limitation is asymmetry in the krypton 6057-Å line defining the meter.
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