Patent ID: 6499315
Filing Date: 2002-12-31
Classification: C03B,C03C,Y02P

Abstract:
A method of producing a synthetic quartz glass for use in excimer lasers, comprising the steps of:(a) introducing an organodisilazane compound represented by the general formula 1; (R1)3SiNHSi(R2)3â€ƒâ€ƒ(1) wherein R1 and R2 represent the same or a different alkyl group having 1 to 3 carbon atoms, into a flame comprising a combustion gas and a combustion-supporting gas to generate silica fine particles; (b) depositing said silica fine particles onto a rotating heat resistant substrate; and (c) essentially simultaneously with said deposition melting said deposited particles to form an ingot of optical synthetic quartz glass, said glass having a birefringence index of 5 nm/cm or less, a refractive index difference (&Dgr;n) of 2Ã—10âˆ’6 or less, an ArF saturated absorbance of 0.05/cm or less, and at the same time which has no striae.