Patent ID: 6410192
Filing Date: 2002-06-25
Classification: C03C,G03F

Abstract:
A photolithography method for producing patterns, said method comprising;providing an illumination subsystem for producing and directing a <300 nm ultraviolet radiation &lgr;, providing a mask subsystem with a transmitting photolithography mask, said photolithography mask including a low birefringence fused silica SiO2 glass wafer with photolithography pattern depictions, said SiO2 glass wafer containing &lE;0.1 ppm wt. F and having a glass birefringence&lE;2 nm/cm, measured at 632.8 nm, providing a projection optics subsystem, providing a radiation sensitive print subsystem, said print subsystem including a radiation sensitive print media, aligning said illumination subsystem, said mask subsystem, said projection optics subsystem, and said radiation sensitive print subsystems and illuminating said photolithography mask with said ultraviolet radiation &lgr; such that said photolithography pattern depictions of said low birefringence SiO2 glass wafer mask with said SiO2 glass containing &lE;0.1 ppm wt. F are projected onto said radiation sensitive print media wherein polarization dispersions of ultraviolet radiation &lgr; is inhibited.