摘要 |
PROBLEM TO BE SOLVED: To obtain quartz glass having excellent durability to optical glass due to transmission of ultraviolet rays having high power from excimer laser, etc. SOLUTION: This optical synthetic quartz glass has 2261-2270 cm-1 wavenumbers of absorption peaks in the vicinity of 2260 cm-1 of infrared ray absorption spectrum and <200 ppm OH group content based on weight ratio. |