CdSe down-converter tuned from 9.5 to 24 μm

Abstract
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.