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The characteristics of LaBr3 : Pr and LaCl3 : Pr infrared quantum counters used for detection near 4.5 μm have been investigated in detail. Quantum efficiency for infrared-to-visible upconversion is in agreement with our estimates based on the spectroscopic properties of these materials. Highest sensitivity was obtained with pulse laser pumping in LaCl3 : Pr at 82 °K. Maximum crystal quantum efficiency and detectivity under these conditions were Q=1.2×10−3 and D*=1.4×109 cm Hz1/2/W. The detectivity is the highest reported for any IRQC device. Pump-induced fluorescence measured without ir signal proved to be the limiting source of noise for both cw and pulsed pumping.
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Case et al. (1979) studied this question.
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