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A review of the current progress in fiber optics for the mid-infrared range of the spectrum (2.0–50.0 µm) is performed. The problem in development of infrared (IR) optical fibers with the extended working-wavelength range also having increased radiation resistance, is substantiated. The study of diagrams of AgBr–TlI and AgBr–TlBr0.46I0.54 quasi-binary section of the AgBr–AgI–TlBr–TlI four-component...
For operating at the CO2 laser wavelength (10.6 μm), we manufactured single- and double-layered infrared (IR) fibers, as well as those with an enlarged mode field diameter, obtained via extrusion from Ag(Cl)xBr1 − x (0 < x < 1), Ag1 − xTlxBr1 − xIx (0 < x ≤ 0.08), Ag1 − xTlxClyIzBr1 − y − z (0.003 ≤ x ≤ 0.040; 0.066 ≤ y ≤ 0.246; 0.004 ≤ z ≤ 0.048) crystals. We calculated...
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