FLUORIDE OPTICAL GLASS, CAPABLE OF LUMINESCENCE IN 1000-1700 nm RANGE, METHODS OF PRODUCING SAID GLASS AND FIBRE-OPTIC GUIDE Russian patent published in 2013 - IPC C03C3/32 C03C4/12 

FIELD: chemistry.

SUBSTANCE: invention relates to fluoride optical glass capable of luminescence in the 1000-1700 nm range when excited with radiation with wavelength in the range of 400-1100 nm. The glass-forming components in the glass are BiF₃, ZrF₄, as well as fluorides of Li, Na, Al and Ba, and the luminescence source is bismuth in subvalent state. The glass can further contain BaF₂ and/or LiF and/or NaF and/or AlF₃, with the following content of components (mol %): BiF₃ 1-50%, ZrF₄ 40-58%, BaF₂ 0-25%, LiF 0-20%, NaF 0-10%, AlF₃ 0-5%. The reducing agent used when producing the glass is NH₄F or NH₄HF₂ or urea or bismuth metal. The method of producing optical glass involves preparing a mixture by mixing BiF₃ and ZrF₄ as glass-forming components with addition of a reducing agent, heating the obtained mixture in a medium of an inert gas to temperature of 700-900°C, holding the melt at said temperature until bismuth in subvalent state is obtained and rapid cooling of the obtained glass.

EFFECT: making fibre-optic guides having low radiation leakage over long distances.

9 cl, 7 ex, 2 dwg