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Determination of the speed of light by absolute wavelength measurement of the R(14) line of the CO2 9.4-μm band and the known frequency of this line

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Abstract

A precision long-arm scanning Michelson interferometer system is described that is capable of measuring absolute laser wavelength to within several parts in 109 in the 10-μm spectral range and to within several parts in 1011 in the visible range. The R(14) line of the CO2 9.4-μm band is measured to be 9.305 385 613 (70) μm. This measured value and the known frequency of this line give a value for the speed of light: c = 299 792 457.6 (2.2) m/sec, in agreement with the recent independent measurements of c and its recommended value.

© 1977 Optical Society of America

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