The transmission in the terahertz (THz) region (up to 3000 μm) of alkali halide monocrystals of sodium chloride (NaCl), potassium chloride (KCl), potassium bromide (KBr) and rubidium iodide (RbI), widely used in the infrared region, was studied. The dependences of the absorption coefficient of these materials in the range 0.9 – 3000 μm were obtained. Near 1000 – 3000 μm, the studied materials are transparent, which allows them to be used in THz devices of the millimeter range.
The spectral dependences of the transmittance of CsI, AgCl, KRS-5 and KRS-6 single crystals in the infrared (IR) and terahertz (THz) ranges have been measured. The spectral dependences of the absorption (attenuation) coefficient of these crystals were calculated in the spectral range of 200–3000 μm. It was found, that these crystals are transparent in the millimeter range, which makes it possible to use materials when working with THz radiation. It should be noted that, in contrast to the IR spectral region, the optical quality of the surface of the crystal samples practically does not affect the transmission in the millimeter range.
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