Patent ID: 8635886
Filing Date: 2014-01-28
Classification: C03B,C03C

Abstract:
1. A method of producing copper-containing silica glass, comprising: hydrolyzing silicon compounds with an oxyhydrogen flame; producing silica particles from the hydrolyzed silicon compounds; depositing the silica particles to obtain a silica porous body; immersing the silica porous body in a solution containing copper ions; maintaining the silica porous body in the solution for a predetermined time; removing the silica porous body from the solution to dry; and vitrifying the dried silica porous body under an atmosphere that includes a mixed gas atmosphere of hydrogen and an inert gas containing hydrogen of from 0.01 vol % to 3 vol %, the vitrifying occurring at a temperature ranging from 1,350° C. to 1,600 ° C., wherein vitrifying the silica porous body suppresses copper cluster formation in the copper-containing silica glass, wherein the copper-containing silica glass has copper of from 5 wtppm to 200 wtppm, wherein the total cross-sectional area of bubbles each having a diameter of 0.08 mm or more which are contained in 100 cm wherein each of concentrations Na, K, Mg, Ca and Al is less than 1 wtppm, wherein the OH group concentration is from 0.1 wtppm to 500 wtppm.