The present invention relates to a glass composition, and a method for producing same, where the glass is a soda-lime-silica glass, and comprises, in weight percentage: from 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO. The glass having an illuminant A light transmission (T.sub.LA) greater than 70%, a direct solar transmittance (T.sub.DS) of less than 51%, a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%; a dominant wavelength () from 490 nm to 600; and excitation purity less than 7, for thickness from about 0.7 to 3.0 mm.

A UV lamp including a filter material of doped quartz glass is provided that effects a transparency as high as possible for operating radiation in the ultraviolet spectral range above 210 nm together with low transparency in the wavelength range below about 190 nm. The filter material of doped quartz glass includes at least 99 wt. % of SiO.sub.2 and Al.sub.2O.sub.3, wherein the Al.sub.2O.sub.3 portion is in the range of 2 wt. % to 4 wt. The filter material has an edge wavelength at a wavelength below 190 nm and a spectral transmission of 80% mm.sup.1 or higher at a wavelength of 210 nm.

The Ti.sup.3+ ions present in Ti-doped silica glass cause a brown staining of the glass, causing inspection of the lens to become more difficult. Known methods for reducing Ti.sup.3+ ions in favor of Ti.sup.4+ ions in Ti-doped silica glass include a sufficiently high proportion of OH-groups and carrying out an oxygen treatment prior to vitrification, which both have disadvantages. In order to provide a cost-efficient production method for Ti-doped silica glass, which at a hydroxyl group content of less than 120 ppm shows an internal transmittance (sample thickness 10 mm) of at least 70% in the wavelength range of 400 nm to 1000 nm, the TiO.sub.2SiO.sub.2 soot body is subjected to a conditioning treatment with a nitrogen oxide prior to vitrification. The blank produced in this way from Ti-doped silica glass has the ratio Ti.sup.3+/Ti.sup.4+510.sup.4.

Glasses containing silicon dioxide (SiO.sub.2) and/or boron oxide (B.sub.2O.sub.3) as glass formers and having a refractive index n.sub.d of greater than or equal to 1.7, as measured at 587.56 nm, and a density of less than or equal to 4.5 g/cm.sup.3, as measured at 25 C., are provided. Optionally, the glasses may be characterized by a low optical dispersion, a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum, and/or good glass forming ability.

Glasses containing silicon dioxide (SiO.sub.2) and/or boron oxide (B.sub.2O.sub.3) as glass formers and having a refractive index n.sub.d of greater than or equal to 1.80, as measured at 587.56 nm, a density of less than or equal to 5.5 g/cm.sup.3, as measured at 25 C., and a high transmittance to, particularly to blue light, are provided. Optionally, the glasses may be characterized by a high transmittance in the visible and near-ultraviolet (near-UV) range of the electromagnetic spectrum and/or good glass forming ability.

On an EUV light-reflecting surface of titania-doped quartz glass, an angle () included between a straight line connecting an origin (O) at the center of the reflecting surface to a birefringence measurement point (A) and a fast axis of birefringence at the measurement point (A) has an average value of more than 45 degrees. Since fast axes of birefringence are distributed in a concentric fashion, a titania-doped quartz glass substrate having a high flatness is obtainable which is suited for use in the EUV lithography.

The present invention provides a glass sheet having soda-lime-silica glass composition with a high visible light transmittance (L.sub.tC) of at least 89% with a dominant wavelength (DW) from about 490 to 505 nanometers and purity (Pe) of no more than 1% for control thickness of 5.66 mm and methods of making the same. The glass composition comprising a low iron raw material, a total iron oxide (Fe.sub.2O.sub.3) of 0.02 to 0.06 wt. %, ferrous (FeO) from 0.006 to 0.02 wt. %, redox (FeO/Fe.sub.2O.sub.3) from about 0.30 to 0.55, Cr.sub.2O.sub.3 from about 0.3 to 10 ppm, TiO.sub.2 from about 50 to 500 ppm, SnO.sub.2 from about 10 to 500 ppm, and a critical amount from about 0.10 to 0.25 wt. % of SO.sub.3. The low content of iron oxide is achieved by the partial substitution of regular raw materials by low iron raw materials, with a complete substitution of regular dolomite by a low iron dolomite with a maximum content of 0.020 wt. % Fe.sub.2O.sub.3.

A glass composition includes from about 50 mol. % to about 70 mol. % SiO.sub.2, from about 5 mol. % to about 10 mol. % Al.sub.2O.sub.3, from about 10 mol. % to about 20 mol. % Na.sub.2O, and from about 2 mol. % to about 6 mol. % K.sub.2O, from about 0 mol. % to about 0.005 mol. % Fe.sub.2O.sub.3, from about 2 mol. % to about 10 mol. % ZnO, wherein the glass composition comprises R.sup.1O and the sum of R.sup.1O and ZnO is greater than about 4 mol. %, wherein R.sup.1 is an alkaline earth metal, wherein the glass composition has a Young's modulus of at least 65 GPa, and wherein the glass composition has a coefficient of thermal expansion between 10.0 and 13.0 ppm/ C. The glass composition has a high ultraviolet transmission and can be used to form glass articles configured for semiconductor carrier substrates.

An optical glass includes, in terms of mol % of cations, a total amount of La.sup.3+, Y.sup.3+, and Gd.sup.3+ components falling within a range of from 5% to 65% and a total amount of Zr.sup.4+, Hf.sup.4+, and Ta.sup.5+ components falling within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La.sup.3++Y.sup.3++Gd.sup.3+)(Zr.sup.4++Hf.sup.4++Ta.sup.5+)400(%).sup.2.

One or more glass articles include an aluminum oxide containing silicate glass matrix. The glass matrix has less than 1 SiO.sub.2-enriched glassy sphere of compositional inhomogeneities per 15 g of glass.