Patent ID: 8039409

Claim:
A TiO 2 -containing silica glass for optical member for EUV lithography, having a TiO 2 concentration of from 3 to 14% by mass; containing Sn, in terms of SnO 2 , in an amount of from 0.01 to 10% by mass; having an internal transmittance per 1-mm thickness in a wavelength region of from 400 to 700nm, T 400-700 , of 98% or more; having a fluctuation width ΔSnO 2 of SnO 2 concentration of 0.1% by mass or less within an area of 10 mmx10 mm; and having an internal transmittance per 1-mm thickness in a wavelength region of from 400 to 3,000 nm, T 400-3000 , of 70% or more.