A vapour phase method and growth set-up for the pure and Cl-doped CdTe single crystals preparation are described. The optical quality of as-grown crystals was investigated by infrared transmission microscopy over a wide range of wavelengths. It was revealed that their optical and electrical properties depend on the doping level. Undoped and low-doped (Cl concentration N_Cl=10¹⁷ cm^-3) materials transmittance is high enough (larger than 60% in the wavelenght range of 2-25 μm) but their resistivity does not exceed 10⁶ Ω cm. When the chlorine concentration increases the crystals become semiinsulating (>10⁸ Ω cm). But the reduction of transmittance was observed for heavily doped (N_Cl>10¹⁹ cm^-3) crystals. Their calculated extinction coefficients yield power law dependence on photon energy in the short wavelength range of the spectra. The calculated scattering coefficients correlate well with the concentration and size distribution of the second phase inclusions determined by means of chemical etching technique and by SEM.

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