SYNTHETIC SILICA GLASS OPTICAL MEMBERS AND PROCESS FOR THE PRODUCTION THEREOF

摘要

A process for producing a synthetic silica glass optical component which contains at least 1x10<17> molecules/cm<3> and has an OH concentration of at most 200 ppm and substantially no reduction type defects, by treating a synthetic silica glass having a hydrogen molecule content of less than 1x10<17> molecules/cm<3> at a temperature of from 300 to 600 DEG C in a hydrogen gas-containing atmosphere at a pressure of from 2 to 30 atms.