Patent ID: 6492072
Filing Date: 2002-12-10
Classification: C03B,C03C,G03F,Y02P

Abstract:
A VUV transmitting silicon oxyfluoride glass having an OH content less than 5 ppm by weight, a Cl content less than 5 ppm by weight, a H2 content less than 1Ã—1017 molecules/cm3, a fluorine content of at least 0.1 weight %, said glass consisting essentially of Si, O and F and essentially free of metal to metal Siâ€”Si bonds, said glass having an internal transmission in the wavelength range of 157 nm to 175 nm of at least 85%/cm and an increase of 215 nm absorption of less than 0.1 optical density per mm when exposed to at least 0.96Ã—106 pulses of 157 nm F2 excimer laser radiation at 4 mJ/cm2-pulse.