The S/N ratios of the rf beat notes between harmonics of an x-band microwave source and the mixed output of two CO2 lasers at different frequencies are studied by means of the W-Ni and W-Co point-contact diodes at various mixing orders and various conditions of dc bias voltage. By applying the appropriate dc bias voltage to the W-Co diode in the even mixing orders, improvements on the S/N ratios by 5–10 dB are obtained.
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Kurosawa et al. (1980) studied this question.
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