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Flux dependent non-linearity (reciprocity failure) in HgCdTe NIR detectorswith 1.7 micron cut-off was investigated. A dedicated test station was designedand built to measure reciprocity failure over the full dynamic range of nearinfrared detectors. For flux levels between 1 and 100,000 photons/sec alimiting sensitivity to reciprocity failure of 0.3%/decade was achieved. Firstmeasurements on several engineering grade 1.7 micron cut-off HgCdTe detectorsshow a wide range of reciprocity failure, from less than 0.5%/decade to about10%/decade. For at least two of the tested detectors, significant spatialvariation in the effect was observed. No indication for wavelength dependencywas found. The origin of reciprocity failure is currently not well understood.In this paper we present details of our experimental set-up and show theresults of measurements for several detectors.

Investigating reciprocity failure in 1.7-micron cut-off HgCdTe detectors