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太赫茲棱鏡
我們提供以下配置的太赫茲棱鏡：
? 傳統（直角）棱鏡。這種類型用于光學方案設計。
? 衰減全反射(ATR)棱鏡。這些特殊的棱鏡用來研究一些在透射中難
以進行分析的材料。
Absorption spectroscopy of materials with intensive absorption becomes practically impossible because of intensive absorption and Fresnel reflection. In this case the most suitable method of investigation absorbing materials is method of frustrated total internal reflection. This method is based on the effect of reducing of reflection coefficient of radiation from interface between high refractive index medium n0 and absorbing medium with less refractive index n at the angle of incidence that exceeds the critical angle ΘС= arcsin(n/n0 ). Value of reflection coefficient depends on the angle of radiation incidence， radiation polarization as well as refractive index of the sample. Right choice of prism parameters (specifically base angle of the prism) allows obtaining good ATR spectrum. Method of frustrated total internal reflection in THz range allows investigating materials with absorption coefficients from 102 to 104 cm-1 .
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