OPTICAL MEMBER FOR LASER LIGHT

摘要

PURPOSE:To improve the laser light resistance of an optical member and to reduce fluorescence as well as to ensure the stability of the refractive index and transmissivity by forming the optical member with synthetic quartz glass having a prescribed concn. of OH groups and a prescribed concn. of each metal lic element. CONSTITUTION:This optical member for laser light is formed with synthetic quartz glass having >=100ppm concn. of OH groups and <=50ppb concn. of each metallic element, concretely <=50ppb concn. of each alkali metal, <=50ppb concn. of each alkaline earth metal and <=10ppb concn. of each transition metal.