Progress with a Determination of the Speed of Light

I. Far Infra-red Frequency Measurements and Two-laser Mixing
  • C. C. Bradley
  • G. J. Edwards
  • D. J. E. Knight
Conference paper


Until recently the direct measurement of frequencies in the infra-red spectral region has not been possible because of the lack of suitable detectors and mixers with response times of the order of 10−13 to 10−14 seconds. Through the development over the last three or four years of the metal-oxide-metal diode and Josephson junction point contact devices such measurements are now feasible.


Laser Emission Beat Frequency Beat Signal Fresnel Number Travel Wave Antenna 
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Copyright information

© Plenum Publishing Company Ltd 1972

Authors and Affiliations

  • C. C. Bradley
    • 1
  • G. J. Edwards
    • 2
  • D. J. E. Knight
    • 2
  1. 1.National Physical LaboratoryDivision of Electrical ScienceTeddingtonEngland
  2. 2.Division of Quantum MetrologyNational Physical LaboratoryTeddingtonEngland

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