GLASS HAVING LEAD SULPHIDE NANOPARTICLES FOR CLARIFYING FILTERS Russian patent published in 2013 - IPC C03C10/02 

FIELD: chemistry.

SUBSTANCE: glass having lead sulphide nanoparticles (PbS) is used in laser equipment as clarifying filters, specifically solid-state passive shutters for near-infrared lasers which are sued in ophthalmology, fibre-optic communication systems, optical location and range finding. Spectral absorption and clarification at wavelength 1.5 mcm is achieved by forming in a glass matrix PbS nanoparticles with a defined size (5.5-5.9 nm) as a result of heat treatment of the glass. The glass has components in the following ratios, wt %: SiO₂ 50.0-54.5; Na₂O 6.0-7.5; ZnO 12.5-15.0; PbO 6.5-8.5; S 3.5-4.0; AlF₃ 3.0-3.5; K₂O 10.0-15.0.

EFFECT: forming lead sulphide nanocrystals with size of 5,5-5,9 nm in a silicate glass matrix to provide spectral absorption and clarification at wavelength 1,5 mcm.

2 tbl