Infrared transmission and properties of glasses in the PbO–B2 O3 –SiO2 –GeO2 system

Abstract

A study of transparent materials for infrared emission is conditioned by the need for development and improvement of the optical and optoelectronic devices for space, aviation and medical purposes. Easily fusible optical glasses working in the nearand mid-infrared spectral region being characterized by a high refractive index are of great scientific and practical interest. The objective of these studies was to study influence of the chemical composition on the infrared transmission and properties of glasses in the PbO–B2O3–SiO2–GeO2 system. Conducted studies have testified to the fact that the transmission cutoff of glasses in the infrared region varies from 2.7 to 5.5 μm depending on the content of basic glass forming oxides B2O3, SiO2 and GeO2. The additive of fluoride to the compositions of glasses under study makes for the expansion of the transmission cutoff of infrared rays and the decrease in the intensity of absorption bands of the hydroxyl groups.