A process for the increase of the warmth joint strength of phosphate laser glass

摘要

PURPOSE:To increase the heat and shock resistance, etc. of the titled glass by coating a sol obtained by the hydrolysis and partial condensation of metal alkoxide, etc. on the surface of the phosphate laser glass, and heat-treating to form a vitreous film. CONSTITUTION:An organic metallic compd. such as metal alkoxide (e.g., ethyl silicate and sodium methylate) contg. a metallic element such as Si, B, Na, and Al which is capable of forming glass is dissolved into an organic solvent (e.g., ethyl alcohol and isopropanol). Then an appropriate amt. of water necessary for hydrolysis is added and agitated to carry out the hydrolysis and partial condensation. Then the obtained sol is coated on the surface of phosphate laser glass by immersion, etc., and the coated film is heat-treated to obtain a vitreous film. The heat and shock resistance and the breaking strength of the phosphate laser glass can be increased in this way.