Patent ID: 6576578
Filing Date: 2003-06-10
Classification: C03B,C03C,Y02P

Abstract:
A synthetic quartz glass for use with light with a wavelength ranging from 150 to 200 nm, wherein the OH group concentration in the synthetic quartz glass is at most 100 ppm, the hydrogen molecule concentration is at most 1Ã—1017 molecules/cm3, reduction type defects are at most 1Ã—1015 defects/cm3, oxidation type defects are at most 2Ã—1017 and the relation between the change &Dgr;k163 in the absorption coefficient at a wavelength of 163 nm and the change &Dgr;k190 in the absorption coefficient at a wavelength of 190 nm, before and after radiation of the glass with ultraviolet rays with a wavelength of at most 150 nm, satisfies the expression 0163190.