Abstract Volume filamentary inclusions in ZnGeP2 have been visualized using the digital holography method. The chemical composition of the filamentous volume inclusions Zn3P2 and Ge have been determined using the method of X-ray diffraction analysis. It is shown that the presence of volume inclusions in the ZnGeP2 single-crystal leads to an increase in the reflection coefficient in the region of 12.5 μm. The dispersion dependences of the refractive index and the absorption coefficient of the studied ZnGeP2 samples at wavelengths of 300–1000 μm in the region of non-fundamental absorption have been obtained. It has been shown that the presence of volume inclusions in a single-crystal leads to an increase in the refractive index in the entire THz range under study by the value of Δnmax = 0,0008. The difference between absorption coefficients for the studied samples varies from Δα = 0.1 cm−1 to Δα = 0.15 cm−1 depending on the wavelength.

中文翻译：

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ZnGeP2 单晶的体积夹杂物对中红外和太赫兹波长范围内折射率和吸收系数的色散的影响

摘要 ZnGeP2 中的体积丝状内含物已使用数字全息方法可视化。丝状体积夹杂物 Zn3P2 和 Ge 的化学成分已使用 X 射线衍射分析方法确定。结果表明，ZnGeP2 单晶中体积夹杂物的存在导致反射系数在 12.5 μm 范围内增加。已经获得了所研究的 ZnGeP2 样品在 300-1000 μm 波长下在非基波吸收区域的折射率和吸收系数的色散依赖性。已经表明，单晶中体积夹杂物的存在导致所研究的整个太赫兹范围内的折射率增加，Δnmax = 0,0008。