Preparation of special purity Ge – S – I and Ge – Se – I glasses

Abstract The paper considers the new approaches for the production of special pure Ge – S – I and Ge – Se – I glasses via the germanium(IV) iodide, germanium(II) sulfide, as well as the Ge 2 S 3 , Ge 2 S 3 I 2 and Ge 2 Se 3 I 2 glassy alloys. The glass samples containing 0.03–0.17 ppm(wt) hydrogen impurity in the form of SH-group, 0.04–0.15 ppm(wt) hydrogen impurity in the form of SeH-group, and 0.5–7.8 ppm(wt) oxygen impurity in the form of Ge-O were produced. Using a crucible technique, the single-index [GeSe 4 ] 95 I 5 glass fibers of 300–400 μm diameter were drawn. The minimum optical losses in the best fiber were 1.7 dB/m at a wavelength of 5.5 μm; the background optical losses were within 2–3 dB/m in the spectral range of 2.5–8 μm.