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The performance of an InSb infrared detector has been evaluated at liquid nitrogen and liquid helium cryogenic temperatures. A significant improvement in sensitivity was observed when the detection system was Johnson noise limited. With 300-K background radiation and diffraction limited throughout, the NEP of the detector is 1.5 x 10(-16) W Hz(-(1/2)) at 1.65 microm. Potential improvement is expected especially for astro-physical observations which are made in lower photon background conditions.
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Zhang et al. (1982) studied this question.
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