Abstract

Recent advances in excimer laser technologies have produced a growing demand for optical materials, such as lenses and optical fibers, with good transmittance in the UV region. Recently, Imai et al. have reported that absorption bands at 7.6 eV and 5.0 eV were observed in a high-purity silica glass prepared by the chemical vapor deposition method.¹ It has been determined that these absorption bands originate in one type of oxygen-deficient center with a Si-Si structure.^2,3 This paper describes the investigation of the effect of adding chlorine, fluorine, and GeC₂ on the optical absorption properties in the UV region of silica glasses made with vapor-phase axial deposition.

© 1991 Optical Society of America