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Different current-voltage characteristics were found for diodes with Ni and Nb substrates. The diode bias dependence of the rectified signals at 30, 88, and 118 THz (CO2, He-Ne, color-center laser) is found to correspond to the dc characteristics in both cases. Harmonic mixing between CO2 and He-Ne laser, CO2 and color-center laser respectively, was obtained for one of these characteristics only.
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Klingenberg et al. (1983) studied this question.
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