An optical glass for the manufacture of large transmission optics, such as lenses having a thickness of 100 millimeters or more, comprises 35 to 70 wt.-% SiO2, 17 to 35 wt.-% Al2O3, 3 to 17 wt.-% P2O5, 0 to 6 wt.-% Li2O, 0,5 to 4 wt.-% MgO, 0,5 to 3 wt.-% ZnO, a maximum of 1 wt.-% CaO, a maximum of
An optical glass for the manufacture of large transmission optics, such as lenses having a thickness of 100 millimeters or more, comprises 35 to 70 wt.-% SiO2, 17 to 35 wt.-% Al2O3, 3 to 17 wt.-% P2O5, 0 to 6 wt.-% Li2O, 0,5 to 4 wt.-% MgO, 0,5 to 3 wt.-% ZnO, a maximum of 1 wt.-% CaO, a maximum of 0,5 wt.-% BaO, 0,5 to 6 wt.-% TiO2, 0,5 to 3 wt.-% ZrO2, 0 to 1 wt.-% Na2O, 0 to 1 wt.-% K2O, a maximum of 1 wt.-% of refining agents (As2O3, SP2O3) and a maximum of 500 ppm of other contaminants. The glass composition may be equal to the composition of the glass ceramic Zerodur® and allows to manufacture large transmission optics in a cost-effective way, has a maximum of transmittance which is in the range of a He--Ne lasers and has a CTE of about 3·10-6/K.
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What is claimed is: 1. An optical glass comprising (in wt.-%): SiO2: 35-75 Al2O3: 17-35 B2O3: 0-5 P2O5: 1-17 SnO2 + ZrO2 + TiO2: 0.1-8 Na2O + K2O + Cs2O + Li2O: 0.1-8 CaO + MgO + SrO + BaO + ZnO: 0.1-8 refining agents: ≦1.0 and further comprisin
What is claimed is: 1. An optical glass comprising (in wt.-%): SiO2: 35-75 Al2O3: 17-35 B2O3: 0-5 P2O5: 1-17 SnO2 + ZrO2 + TiO2: 0.1-8 Na2O + K2O + Cs2O + Li2O: 0.1-8 CaO + MgO + SrO + BaO + ZnO: 0.1-8 refining agents: ≦1.0 and further comprising a maximum of 500 ppm of any impurity selected from the group formed by coloring agents, noble metals and halogenides; further comprising a maximum of 120 ppm of Fe2O3; and having a coefficient of thermal expansion in the range between 0° C. and 50° C. being 4.1·10-6/K at the most. 2. The optical glass of claim 1, comprising a maximum of 500 ppm of any element selected from the group formed by PbO, Pt, Rh, Cl-, and F-. 3. The optical glass of claim 1, comprising a maximum of 80 ppm of Fe2O3. 4. The optical glass of claim 1, having a coefficient of thermal expansion in the range between 0° C. and 50° C. being 3.5·10-6/K at the most. 5. The optical glass of claim 1, having a coefficient of thermal expansion in the range between 0° C. and 50° C. being about 3·10-6/K. 6. The optical glass of claim 1, having a refractive index nd in the range of 1.42≦nd≦1.63. 7. The optical glass of claim 1, having a refractive index nd in the range of 1.47≦nd≦1.58. 8. The optical glass of claim 1, having an Abbe coefficient νd in the range of 53≦νd≦63. 9. The optical glass of claim 1, having an Abbe coefficient νd in the range of 57.1≦νd≦59.1. 10. The optical glass of claim 1, having a true transmittance in the wavelength range between 500 and 750 nanometers which is at least 0.55 for a test body of a length of 100 millimeters. 11. The optical glass of claim 1, having a true transmittance in the wavelength range between 550 and 750 nanometers which is at least 0.7 for a test body of a length of 100 millimeters. 12. The optical glass of claim 1, having a true transmittance in the wavelength range between 600 und 750 nanometers which is at least 0.8 for a test body of a length of 100 millimeters. 13. The optical glass of claim 1, having a true transmittance comprising a maximum that is in the wavelength range between 600 and 750 nanometers. 14. An optical glass comprising (in wt.-%): SiO2: 35-75 Al2O3: 17-35 B2O3: 0-5 P2O5: 1-17 SnO2 + ZrO2 + TiO2: 0.1-8 Na2O + K2O + Cs2O + Li2O: 0.1-8 CaO + MgO + SrO + BaO + ZnO: 0.1-8 refining agents: ≦1.0 and further comprising a maximum of 500 ppm of any impurity selected from the group formed by coloring agents, noble metals and halogenides; and further comprising a maximum of 120 ppm of Fe2O3. 15. An optically transmissive optical component comprising an optical glass comprising (in wt.-%): SiO2: 35-75 Al2O3: 17-35 B2O3: 0-5 P2O5: 1-17 SnO2 + ZrO2 + TiO2: 0.1-8 Na2O + K2O + Cs2O + Li2O: 0.1-8 CaO + MgO + SrO + BaO + ZnO: 0.1-8 refining agents: ≦1 coloring oxides and ≦1; other impurities: and further comprising a maximum of 120 ppm of Fe2O3; wherein said optical component has a thickness of at least 50 millimeters and a true transmittance in the wavelength range between 550 and 750 nanometers which is at least 0.7 for a test body of a length of 100 millimeters.
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Marker Alexander J. (Moscow PA), Cladding glass ceramic for use in high powered lasers.
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