Abstract
WE report here the completion of a determination of the speed of light at the National Physical Laboratory1. The value was obtained from the product of the measured frequency and the wavelength, determined through up-conversion, of the radiation from a CO2 laser stabilised to the R(12) transition of CO2 at 9.3 µm.
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References
Bradley, C. C., Edwards, G. J., Knight, D. J. E., Rowley, W. R. C., and Woods, P. T., Phys. Bull., 23, 15 (1972).
Blaney, T. G., et al. Nature, 244, 504 (1973).
Jolliffe, B. W., Rowley, W. R. C., Shotton, K. C., Wallard, A. J., and Woods, P. T., Nature, 251, 46 (1974).
Evenson, K. M., et al., Phys. Rev. Lett., 29, 1346 (1972).
Terrien, J., Nouv. Revue Opt., 4, 215 (1973).
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BLANEY, T., BRADLEY, C., EDWARDS, G. et al. Measurement of the speed of light. Nature 251, 46 (1974). https://doi.org/10.1038/251046a0
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DOI: https://doi.org/10.1038/251046a0
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