Abstract

In the absence of a thermal radiation background, it is possible to obtain a very high responsivity with far ir extrinsic photoconductive detectors. Using a low noise liquid helium-cooled preamplifier, we have obtained an NEP of 1014W Hz12 for Ge:Ga at 100 μ in an instrument designed for rocket ir astronomy. The limiting noise factor appears to be generation recombination noise due to thermal excitation of other impurities present in the germanium.

© 1969 Optical Society of America

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