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Phase-locking millimetre-wave klystrons for the measurement of submillimetre laser frequencies

Phase-locking millimetre-wave klystrons for the measurement of submillimetre laser frequencies

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A single-loop method of phase locking up to 100 GHz is described. Spectral broadening observed in harmonic mixing with an HCN laser at 891 GHz (with resolution 1 in 108) is attributed to phase noise and modulation on the base-reference quartz-crystal oscillator. Zero beats at 99 GHz between klystrons phase-locked to a common reference give frequency resolution of the order of 1 in 1013.

References

    1. 1)
      • C.C. Bradley , D.J.E. Knight . Absolute frequency measurement of a CF2CH2 absorption line near 890 GHz using an HCN laser. Phys. Lett. , 59 - 60
    2. 2)
      • C.C. Bradley , D.J.E. Knight , C. McGee . , Frequency locking an HCN laser to a molecular absorption line.
    3. 3)
      • L. Frenkel . Methods for the measurement of frequency and stability of laser generators of submillimetre oscillations. Electron. Tech. (Warsaw) , 47 - 52
    4. 4)
      • R.B. Shields . Review of the specification and measurement of short-term stability. Microwave. J. , 49 - 55
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      • D.B. Leeson . Short term stable microwave sources. Microwave. J. , 59 - 69
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