Phase-matched difference-mixing of the frequency tunable CO$-2$/ lasers in three nonlinear crystals is considered to generate a tunable submillimeter radiation. Optical properties of ZnGeP$-2$/, AgGaSe$-2$/, and new promising nonlinear mixed crystals like AgGa$-x$/In$-1$MIN@x$/Se$-2$/ in middle IR and FIR spectral ranges have been investigated. The coefficients of Sellmeier dispersion equations for AgGa$-x$/In$-1$MIN@x$/Se$-2$/ and AgGaSe$-2$/ for IR and those for ZnGeP$-2$/ for FIR have been determined. Phase- matching curves and phase-matching angular widths for both direct and backward waves have been calculated. A principle possibility of application of the emission converted is shown to control some atmospheric pollutants.
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机译：三种非线性晶体中的频率可调CO $ -2 $ /激光的相位匹配差异混合被认为是产生可调谐的亚倍数钟辐射。 Zngep $ -2 $ /，Aggase $ -2 $ /，以及新的有前途非线性混合晶体，如Agga $-x $ / $ -1 $ min @ x $ / se $ -2 $ /中间IR已经研究过的FIR光谱范围。 agga $ -x $ /以$-$-$ min @ x $ / se $ -2 $ /和AGGase $ -2 $ / for ir，而且为zngep $-2 $ / for fir of已经确定了。已经计算了用于直接和后向波的相位匹配的曲线和相位匹配的角度宽度。施用发射转化的原理可能性被显示为控制一些大气污染物。
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