Progress with a Determination of the Speed of Light
The scheme for measuring the CO2 laser frequency (shown in the Introduction) consists of three separate frequency-mixing experiments using two lower-frequency lasers as transfer oscillators. If an accurate measurement on a stabilized CO2 laser (1) is required, either all the experiments must be performed together, within the thermal drift limitations of the transfer oscillators, or the transfer oscillators must be stabilized too. Although having achieved about 1 in 107 stabilization of the HCN laser (2) we favour simultaneous frequency measurement using automated techniques, but achieving this is highly dependent on the fragile frequency-mixing diodes.
KeywordsPhase Noise Laser Frequency Josephson Junction National Physical LaboratorY Microwave Oscillator
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