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The generation of narrowband millimetre-wave radiation has been demonstrated by photomixing with two longitudinal modes of a microchip laser. The observed linewidth of 430 Hz at 101 GHz frequency indicates that the common-mode-rejection effect of the laser cavity efficiently suppresses frequency fluctuations between the oscillating modes, enabling stable millimetre-wave radiation to be generated.
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Hyodo et al. (1996) studied this question.
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