dc bias dependence of W-Ni and W-Co point-contact diodes as harmonic generators and mixers at 9.4 μm

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Abstract
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.