Various quantum counter schemes involving the lower J levels of Eu3+ and Sm2+ are examined in terms of orbit-lattice-induced multiphonon relaxation processes. The quantum efficiency of the upconversion process has been quantitatively evaluated as a function of the laser pump which brings about the frequency upconversion. Optimum conditions are given for the 10-μ infrared quantum counter, and its detectivity and response time are discussed and compared with other representative 10-μ detectors. It is shown that the 10-μ quantum counter can be operated at 77 K.
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Wright et al. (1971) studied this question.
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