Ceramics-Silikáty 39 (3) 118-120 (1995)

THE PREPARATION OF GeO₂ - PbO GLASSES WITH LOW CONCENTRATION OF OH GROUPS

D. Ležal, J. Pedlíková

Glasses on base germanium dioxide, GeO₂ have a good optical transmission in near and middle infrared region of spectrum up to 4.8 mm. Various oxides, as PbO, TeO₂, etc. added to GeO₂ produce binary and ternary glasses having the similar optical properties as pure GeO2 and they are more stable. This paper deals with the study of GeO₂ - PbO glassy system and with the preparation of these glasses having the low concentration of OH groups. The preparation of glasses was carried out under reactive chlorine atmosphere combined with the oxygen one. The concentration of OH groups is determined from the values of extinction coefficients calculated from the intensity of the absorption bands at the wavelength 2.93 mm. These glasses can be used for drawing of optical fibers usable for a power delivery of Er:YAG laser energy in medicine and for chemical sensors.