Patent ID: 7064093

Claim:
A quartz glass blank for an optical component for transmission of ultraviolet radiation of a wave length of 250 nm and under, said quartz glass blank comprising a glass structure which is essentially free of oxygen defect sites, having an H 2 content in a range of 3×10 17 molecules/cm 3 to 2.0×10 18 molecules/cm 3 , an OH content in a range of 500 weight ppm to 1000 weight ppm, an SiH group content of less than 2×10 17 molecules/cm 3 , a chlorine content in a range of 60 weight ppm to 120 weight ppm, a non-homogeneity in a refractive index of less than 2 ppm, and a stress birefringence of less than 2 nm/cm.