Abstract: In the apparatus for producing glass reduction of reduction-sensitive components in the glass melt is reduced or preferably is prevented during the melting and/or fining processes by introducing an oxidizing agent into the glass melt. The apparatus has a melt crucible, a fining vessel, and a device for conducting oxygen and/or ozone into the glass melt in the melt crucible and/or fining vessel, in order to suppress reduction of reduction-sensitive components of the glass melt. A preferred embodiment of the apparatus has a metallic skull crucible, which includes the melt crucible and/or the fining vessel. The apparatus preferably includes a homogenization unit connected to the fining vessel to receive glass melt from the fining vessel in order to further process the glass melt after refining.

Abstract: The lead- and arsenic-free optical glass has a refractive index nd of 1.55?nd?1.64, an Abbe number ?d of 42??d?65, and a low transition temperature Tg?460° C., good producibility and processability, and crystallization stability. The optical glass has a composition within the following range, in wt. % based on oxide content: P2O5 40-58 ZnO 20-34 Li2O 0.5-5?? GeO2 0.1-11. The glass may also have a total content of SiO2, B2O3 and Al2O3 that is less than 9 wt. %. The glass may contain MgO, SrO, CaO and BaO, but the sum of these oxides is preferably at least 2 wt. % and at most 12 wt. %. The glass may contain at most 5 wt. % of each of La2O3, TiO2, Nb2O5, at most 2 wt. % Ta2O5 and less than 1 wt. % fluorine.

Abstract: The lead-free and arsenic-free optical glasses have a refractive index of 1.83?nd?1.95 and an Abbé number of 24??d?35, good chemical resistance, excellent crystallization stability and a composition, in wt. % based on oxide content, of SiO2, 2-8; B2O3, 15-22; La2O3, 35-42; ZnO, 10-18; TiO2, 9-15; ZrO2, 3-10; Nb2O5, 4-10; and WO3, >0.5-3. Besides containing at most 5 wt. % of each of GeO2, Ag2O and BaO and conventional fining agents, they may also contain at most in total 5 wt. % of Al2O3, MgO, CaO, SrO, P2O5 and up to at most in total 5 wt. % of the components F, Ta2O5. The glasses are preferably free of alkali metal oxides, Bi2O3, Y2O3, Gd2O3 and/or Yb2O3. Optical elements made from the optical glass are also described.

Abstract: The lead-free optical glass can be used in the fields of imaging, sensor technology, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology, as well as of telecommunications, optical communication engineering and optics/lighting in the automotive sector. It has a refractive index nd of 1.82?nd?2.00 and/or an Abbe number vd of 18?vd?28 with good chemical stability, excellent crystallization stability and the following composition, in wt. based on oxide content, of: P2O5 12-35 Nb2O5 30-50 Bi2O3 ?2-13 GeO2 0.1-7?? Li2O ?6 Na2O ?6 K2O ?6 Cs2O ?6 MgO ?6 CaO ?6 SrO ?6 BaO ???7-<17 ZnO ?6 TiO2 ?7 ZrO2 ?7 WO3 ?2-14 F ??6.

Abstract: The optical glass has an index of refraction (nd) greater than or equal to 1.70, an Abbé number (?d) greater than or equal to 35 and a density (?) less than or equal to 4.5 g/cm3. Optical elements made with this optical glass are especially desirable in optical data transfer applications, particularly in read-write devices with movable read-write heads. The glass compositions required to make optical glass with these properties are described.

Abstract: The present invention relates to lead and arsenic free optical hard crown glasses with a low transformation temperature (Tg?520° C.), characterized by their optical range with a refractive index of 1.57?nd?1.61 and an Abbe number of 56??d?63. The glasses have the following composition (in wt %): SiO2 37-46 B2O3 12-18 Al2O3 1-7 Li2O 5.5-<7? Na2O 1-5 K2O <4 MgO <5 CaO <7 BaO 21-29 SrO 0.1-1.5 ZnO ??1-4.5 TiO2 0.1-0.5 ZrO2 ??<0.7 with ? TiO2, ZrO2 < 0.9. Refiners can be added, provided that they do not comprise arsenic.

Abstract: The invention relates to optical glasses intended for the application fields of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology, and for telecommunication, optical communication engineering and optics/lighting in the automotive sector, having a refractive index of 1.60?nd?1.80 and/or an Abbe number of 30??d?40 with a pronounced short flint character, good chemical stability, excellent crystallization stability, good solarization stability and the following composition (in wt. % based on oxide): SiO2 19-45 B2O3 ??3-7.5 Nb2O5 25-31 K2O 2-8 TiO2 0.1-2?? ZrO2 ?6-10 Ta2O5 0.5-8.

Abstract: Optical glasses are described, which are useful for imaging, sensors, microscopy, medical technology, digital protection, photolithography, laser technology, wafer/chip technology, as well as telecommunication, optical communications engineering and optics/lighting in the automotive sector, with a refractive index of 1.80?nd?1.95 and an Abbe value from 19??d?28 with excellent chemical resistance and stability to crystallization. These optical glasses have a composition, in weight. % based on oxide content, of: P2O5, 14-35; Nb2O5, 45-50; Li2O, 0-4; Na2O, 0-4; K2O, 0.5-5; BaO, 17-23; ZnO, 0.1-5; TiO2, 1-<5; ZrO2, 0-6; and Sb2O3, 0.1-2.

Abstract: The present invention relates to the use of organic and/or inorganic peroxides as refining agents in a process for refining of glass melts. These peroxides are available in such a bandwidth that they can be chosen specifically according to the viscosity temperature profile of a glass and can therefore be integrated in an applicatively meaningful synthesis so that in the final product, in the raw glass, no traces of the peroxides are detectable.

Abstract: The present invention refers to optical glasses designated to be used in the areas of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunications, optical communications engineering and optics/illumination in the automotive sector with a refractive index nd of 1.60?nd?1.72 and/or an Abbe number vd of 32?vd?45 with pronounced short flint character, good chemical resistance, excellent resistance to crystallization, good solarization stability and the following composition (in % by weight based on oxides): SiO2 30-45 B2O3 ?8-12 Na2O ?8-15 CaO 0.

Abstract: The lead-free, preferably lithium-free, optical glass is useful in imaging, projection, telecommunications, optical communication and/or laser technology, particularly for making precise-pressed optical elements. It has a refractive index nd of 1.50 to 1.57, an Abbé number ?d of 61 to 70. It also has a low transformation temperature of about or below 400° C., good production and processing properties and crystallization resistance. It has a composition, in percent by weight, based on oxide content of P2O5, 40 to 60; Al2O3, 1 to 20; B2O3, 0 to <5; Na2O, 0 to 30; K2O, 0 to 30; Li2O, 0 to <1; ?M2O, >15 to 40; BaO, 1 to 20; ZnO, 1 to 20; SrO, 0 to 5; CaO, 0 to 5; MgO, 0 to 5; and ?MO, 5 to 25. In addition, it may contain standard refining agents, although it is preferably free of arsenic and fluorine.

Abstract: In the method and system for producing glass reduction of reduction-sensitive ingredients in the glass is reduced or preferably is avoided during the melting and fining processes. The glass preferably has a high refractive index. During the process an oxidizing agent is inducted into a fining vessel and preferably also into a melt crucible made of a slit skull that is cooled by a cooling agent. The oxidizing agent is preferably oxygen. Furthermore a system for conducting the method is also described.

Abstract: The lead-free optical glass can be used in the fields of imaging, sensor technology, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology, as well as of telecommunications, optical communication engineering and optics/lighting in the automotive sector. It has a refractive index nd of 1.82?nd?2.00 and/or an Abbe number vd of 18?vd?28 with good chemical stability, excellent crystallization stability and the following composition, in wt. based on oxide content, of: P2O5 12-35 Nb2O5 30-50 Bi2O3 ?2-13 GeO2 0.1-7?? Li2O ?6 Na2O ?6 K2O ?6 Cs2O ?6 MgO ?6 CaO ?6 SrO ?6 BaO ???7-<17 ZnO ?6 TiO2 ?7 ZrO2 ?7 WO3 ?2-14 F ??6.

Abstract: A short optical glass is disclosed which is particularly suited for the applications imaging, projection, telecommunication, optical information technology and/or laser technology, also particularly suited for fiber applications (light guides or imaging guides). Preferably, the glass has a refractive index of 1.54?nd?1.62 and an Abbe coefficient of 48?vd=57. It further has good attenuating and ion exchange characteristics, good chemical stability and good crystallization stability. The glass comprises 35 to 50 wt.-% SiO2, 0.1 to 6 wt.-% B2O3, 0.1 to 7 wt.-% Al2O3, 0.1 to 4 wt.-% P2O5, 4 to 24 wt.-% R2O (alkali oxides), 6 to 14.5 wt.-% BaO, 0 to 12 wt.-% other RO (alkaline earth oxides), 14 to 25 wt.-% ZnO, 0 to 5 wt.-% La2O3, 0 to 10 wt.-% ZrO2, wherein R2O is an alkali oxide, RO is an alkaline earth oxide other than BaO, wherein Li2O is 6 wt.

Abstract: The present invention relates to lead and arsenic free optical glasses, used for the application areas imaging, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunication, optical communications engineering, optics, illumination and in the automotive sector. The glasses have a refraction power of from 1.73?nd?1.82 and an Abbé value of 43?vd?53 with good chemical consistency and excellent crystallisation stability with the following composition (in weight-%): SiO2 0.1-5.5 B2O3 27-35 La2O3 42-48 BaO 0-5 ZnO 0.5-5?? Y2O3 ?6-12 TiO2 0-4 ZrO2 ?4-10 Nb2O5 0-5 WO3 ?0-5.

Abstract: Optical glasses are described, which are useful for imaging, sensors, microscopy, medical technology, digital protection, photolithography, laser technology, wafer/chip technology, as well as telecommunication, optical communications engineering and optics/lighting in the automotive sector, with a refractive index of 1.80?nd?1.95 and an Abbe value from 19??d?28 with excellent chemical resistance and stability to crystallization. These optical glasses have a composition, in weight % based on oxide content, of: P2O5, 14-35; Nb2O5, 45-50; Li2O, 0-4; Na2O, 0-4; K2O, 0.5-5; BaO, 17-23; ZnO, 0.1-5; TiO2, 1-<5; ZrO2, 06; and Sb2O3, 0.1-2.

Abstract: The invention relates to optical glasses intended for the application fields of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer/chip technology, and for telecommunication, optical communication engineering and optics/lighting in the automotive sector, having a refractive index of 1.60?nd?1.80 and/or an Abbe number of 30??d?40 with a pronounced short flint character, good chemical stability, excellent crystallization stability, good solarization stability and the following composition (in wt. % based on oxide): SiO2 19–45 B2O3 ??3–7.5 Nb2O5 25–31 K2O 2–8 TiO2 0.1–2?? ZrO2 ?6–10 Ta2O5 0.

Abstract: A glass with high internal transmission as well as low tendency to radiation-caused physical compaction and low tendency to solarization, comprising 18 to 31% by weight of SiO2, 0 to 7% by weight of Na2O3, 0 to 7% by weight of K2O, 65 to 84% by weight of PbO, 0.001 to 1% by weight of As2O3+As2O5, which is characterized by a content of 0 to 5000 ppm of Sb2O3 0 to 500 ppm of TiO2 0 to 100 ppm of CuO 0 to 1000 ppm of F. The ?(As2O3, As2O5, Sb2O3, F)?20 ppm and the ratio of As(III)/As(V) is at least 0.5. Such a glass is suitable for the use as optical element.

Abstract: The present invention relates to lead and arsenic free optical hard crown glasses with a low transformation temperature (Tg?520° C.), characterized by their optical range with a refractive index of 1.57?nd?1.61 and an Abbe number of 56??d?63. The glasses have the following composition (in wt %): SiO2 37-46 B2O3 12-18 Al2O3 1-7 Li2O 5.5-<7? Na2O 1-5 K2O <4 MgO <5 CaO <7 BaO 21-29 SrO 0.1-1.5 ZnO ??1-4.5 TiO2 0.1-0.5 ZrO2 ??<0.7 with ? TiO2, ZrO2 < 0.9. Refiners can be added, provided that they do not comprise arsenic.

Abstract: A short optical glass is disclosed which does not comprise any silver, copper, thallium, lead or boron and is particularly suited for the application imaging, projection, telecommunication, optical information technology, and/or laser technology, also particularly suited for fiber applications (light guides or imaging guides). Preferably the glass has a refractive index of 1.55?nd?1.65 and an Abbe coefficient of 48?vd?57 and also has good attenuating and ion exchange characteristics, good chemical stability and good crystallization stability. The glass comprises 35 to <50 wt.-% SiO2; 1 to 10 wt.-% Al2O3; 5 to 15 wt.-% Na2O+K2O+CS2O+Li2O; 20 to 30 wt.-% BaO; 0 to 15 wt.-% ZnO; 0 to 10 wt.-% La2O3; 0 to 10 wt.-% ZrO2; 0 to 6 wt.-% P2O5; 0 to 8 wt.-% MgO+CaO+SrO; 0 to 3 wt.-% of other oxides, and Cs2O<1, Li2O<1, and TiO2<1 wt.-%.