Investigating the optical properties of polycrystalline AgCl(1-x)Br(x) (0≤x≤1) and Ag(0.95)Tl(0.05)Br(0.95)I(0.05) for IR engineering.
Using the Michelson technique we measured the refractive indices for the plane-parallel thin plates made of AgCl1-xBrx(0≤x≤1) and, to the best of our knowledge, for the first time for the Ag0.95Tl0.05Br0.95I0.05 plate, manufactured by hot embossing, at 632.8 nm. We recorded their absorption spectra within the range of 0.19-41.67 μm using UV-Vis spectrophotometry and Fourier transform infrared spectroscopy, which demonstrated that the increase of substituent silver bromide or thallium monoiodide mole fraction in the corresponding solid solution causes the optical density to grow. As the result it moves the transmission edges toward longer wavelengths, while slightly reducing the transmission peak.
Dielectric properties of silver halide and potassium halide crystals.
The refractive indices of mixed AgCl(x)Br(1-x) crystals, with x ranging from 0 to 1, are measured at three wavelengths: 0.6328, 2.94, and 10.6 microm. A nonlinear dependence of the refractive index on composition is observed and explained on the basis of a simple Lorentz-Lorenz classical approximation. The theoretical dependence of the static dielectric constant on composition is also calculated. The same calculation is applied to KCl(x)Br(1-x) crystals, and, in both crystal systems, good agreement with experiment is obtained.
Structure and properties of AgCl1 − x Brx (x = 0.5–0.8) optical fibers
The properties of polycrystalline optical fibers produced by extruding crystals of AgCl1−x Brx(x = 0.5–0.8) solid solutions are studied by optical microscopy, scanning electron microscopy, microstructural analysis, and x-ray microanalysis. The results demonstrate for the first time that the arrangement of polycrystalline regions and recrystallized single-crystal blocks 0.03-–0.10 and 2–5 µm in size, respectively, possesses three- or fourfold symmetry or a mirror plane m, depending on the crystallographic orientation of the parent crystal (cubic symmetry). The effect of the structural properties of the parent crystal on the properties of the fibers is discussed.