Patent ID: 7197896

Claim:
A method for making glass comprising: feeding at least Al 2 O 3 source and SiO 2 source, into one of a flame or a plasma to provide a melt wherein the SiO 2 source is at least one of polymeric SiO 2 source or organometallic SiO 2 source; and cooling the melt to provide the glass, wherein the glass comprises at least 35 percent by weight Al 2 O 3 and SiO 2 in a range from 0.5 to 10 percent by weight, and not more than 10 percent by weight collectively As 2 O 3 , B 2 O 3 , GeO 2 , P 2 O 5 , SiO 2 , TeO 2 , and V 2 O 5 , based on the total weight of the glass.