SYNTHETIC SILICA GLASS OPTICAL MEMBERS AND PROCESS FOR THE PRODUCTION THEREOF

摘要

A process for the production of synthetic silica glass optical members which contain 1 x 10<17> or more hydrogen molecules per cm<3>, have OH group concentrations of 200 ppm or below and are substantially free from reduction type defects, by treating a synthetic silica glass containing fewer than 1 x 10<17> hydrogen molecules per cm<3> at a temperature of 300 to 600 DEG C in a hydrogen-containing atmosphere at a pressure of 2 to 30 atms.