Patent ID: 6541405
Filing Date: 2003-04-01
Classification: C03B,C03C,G03F

Abstract:
A synthetic quartz glass member for an excimer laser, having(i) a change of transmittance at wavelength 193 nm of up to 0.002 cmâˆ’1 as expressed in extinction coefficient when 4Ã—104 shots of ArF excimer laser light are irradiated at 2 mJ/cm2/pulse, (ii) an initial transmittance of at least 99.6% at 193 nm, (iii) a hydrogen molecule content of at least 5Ã—1017 molecules/cm3, (iv) a refractive index amplitude of up to 1Ã—10âˆ’6, and (v) a birefringence of up to 1 nm/cm.