The signal and idler outputs from a proustite parametric oscillator have been difference mixed in a CdSe crystal to produce infrared radiation tuned continuously from 9.4 to 24.3 μm. Difference-frequency powers, monitored by a pyroelectric detector, range from 10 W at 10 μm to 100 mW at 22 μm.
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Hanna et al. (1974) studied this question.
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