Abstract:
The present invention provides a TiO 2 -SiO 2 glass whose coefficient of linear thermal expansion upon irradiation with high EUV energy light is substantially zero, which is suitable as an optical member of an exposure tool for EUVL. The present invention relates to a TiO 2 -containing silica glass having a halogen content of 100 ppm or more; a fictive temperature of 1,100 °C or lower; an average coefficient of linear thermal expansion in the range of from 20 to 100 °C of 30 ppb/°C or lower; a temperature width DT, in which a coefficient of linear thermal expansion is 0 ± 5 ppb/°C, of 5°C or greater; and a temperature, at which a coefficient of linear thermal expansion is 0 ppb/°C, falling within the range of from 30 to 150 °C.
Abstract:
It is to provide a silica glass containing TiO 2 , having a wide temperature range where wherein the coefficient of thermal expansion becomes is substantially zero. A silica glass containing TiO 2 , which has a TiO 2 concentration of from 3 to 10 mass%, a OH group concentration of at most 600 mass ppm and a Ti 3+ concentration of at most 70 mass ppm, characterized by having a fictive temperature of at most 1,200°C, a coefficient of thermal expansion from 0 to 100°C of 0±150 ppb/°C , and an internal transmittance T 400-700 per 1 mm thickness in a wavelength range of from 400 to 700 nm of at least 80%. A process for producing a silica glass containing TiO 2 , which comprises porous glass body formation step, F-doping step, oxygen treatment step, densification step and vitrification step.
Abstract:
A silica glass containing from 3 to 10 mass% of TiO 2 , which has a coefficient of thermal expansion from 0 to 100 °C, i.e. CTE 0 to 100 , of 0 ± 300 ppb/ °C and an internal transmittance per mm in thickness within a wavelength region of from 200 to 700 nm, i.e. T 200 to 700 , of at most 80%.
Abstract:
A method for producing an optical waveguide component includes providing a glass producing soot, providing a soot delivery device adapted to provide an electrostatic charge to the soot, and providing a substrate material adapted to receive the glass producing soot thereon. The method also includes delivering the soot to the delivery device, and accelerating the soot as it passes through the delivery device. The method further includes charging the soot as the soot is passed through the delivery device with a sufficient charge to attract the soot to the substrate material, and depositing the soot on the substrate material by spraying the soot onto the substrate material via the delivery device.
Abstract:
A method for forming EUV Lithography large dimension homogeneous glass body is disclosed which includes delivering a silica precursor (28) to a burner (16) and passing the silica precursor (16) through the flame (36) of the burner (16) to form silica particles (38), depositing the silica particles (38) on a planar surface (14) to form a flat porous EUV Lithography large dimension preform (40) and consolidating the flat porous EUV Lithography large dimension preform (40) into a flat dense EUV Lithography large dimension homogeneous glass body.