摘要:
The invention describes a lead-free and arsenic-free special short flint glass with a refractive index 1.60≦nd≦1.65, an Abbe number of 41≦νd≦52, a relative partial dispersion 0.551≦PgF≦0.570 in the blue spectral region, a relative partial dispersion 0.507≦PCs≦0.525 in the red spectral region, a negative deviation of the relative partial dispersion from the normal line ΔPg,F≦−0.0045 and an improved chemical resistance which has the following composition (in % by weight): SiO2>50–65 Al2O30–7 B2O30–6 Li2O0–6 Na2O 3–11 K2O0–6 MgO 0–12 CaO 1–12 BaO0–8 La2O3 0–15 Ta2O5 0–10 Nb2O5 4–20 ZrO2>10–20 Σ(CaO + MgO + BaO) 1–25 Σ(Na2O + K2O + Li2O) 3–20 SiO2/(ZrO2 + La2O3 + Nb2O5 + Ta2O5)1.5–2.3.
摘要:
The stepped optical fiber has a core glass member and a surrounding cladding glass member. It has a high numerical aperture (NA)≧0.50. The core glass member preferably has a zinc-containing composition including, in % by weight, SiO2, 42 to 53; ZnO, 16 to 38; PbO, 1 to 20; Na2O,
摘要翻译:阶梯式光纤具有芯玻璃构件和周围的包层玻璃构件。 它具有高数值孔径(NA)> = 0.50。 核心玻璃构件优选具有含锌组合物,其包含以重量%计的SiO 2,42至53; ZnO,16〜38; PbO,1〜20; Na 2 O,<14; K 2 O,<12; ZnO和PbO> = 30之和,Na 2 O 2和K 2 O 2之和为> = 2。 与该芯玻璃相容的包层玻璃组合物以重量%计含有SiO 2,60〜72, B 2 O 3,<20; AL 2 O 3,<10; NA 2 O,<18; 和K 2 O,<15。 所得到的光纤具有低衰减,非常中性的色彩传输和低制造成本。 其他包覆玻璃组合物导致在芯玻璃边界层处具有太多结晶的相当差的性质。 还准备了具有甚至更低孔径值> = 0.48的芯玻璃的环保无铅实施例。
摘要:
This invention relates to a device for melting or refining glass or glass ceramics. According to the invention, such a device is provided with the following characteristics: a channel which is arranged in an essentially horizontal manner and which is provided with an inlet and an outlet for the glass melt; and an HF coil for coupling HF energy into the melt is allocated to the channel. The channel is made of a plurality of metal pipes in a similar way to a skull pot. Said pipes can be connected to a cooling medium.
摘要:
The silicate glass has a composition (in % by weight, based on oxide) of SiO2, 54-72; Al2O3, 0.5-7; ZrO2, >10- 5-24; La2O3, 0-6; and TiO2, 0-4. The glass has at least 0.6% by weight of La2O3 or at least 0.1% by weight TiO2. The glass is in hydrolytic glass 1, acid class 3 or better, preferably acid class 1, and lye class 1. It has a glass transition temperature (Tg) of at least 640° C., a thermal expansion coefficient (&agr;20/30O) of 4.1×10−6 to 8.0×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (&ngr;d) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;Pg,F) of up to −0.0130.
摘要:
The silicate glass has a composition (in % by weight, based on oxide) of SiO2, 54-72; Al2O3, 0.5-7; ZrO2, 10-20; B2O3, 0- 5-24; La2O3, 0-5; and TiO2, 0-4. The glass also contains at least 0.6 percent by weight of La2O3 or at least 0.1 percent by weight TiO2. The glass has a hydrolytic resistance in hydrolytic glass 1, an acid resistance in acid class 3 or better, preferably acid class 1, a caustic lye resistance in lye class 1, a glass transition temperature (Tg) of at least 650° C., a thermal expansion coefficient (&agr;20/300) of 4.1×10−6 to 7.4×10−6/K, a refractive index (nd) of 1.53 to 1.63, an Abbé number (&ngr;d) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;Pg,F) of up to −0.0130.
摘要:
The lead-free and arsenic-free optical glasses have a refractive index of 1.83≦nd≦1.95 and an Abbé number of 24≦νd≦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.
摘要翻译:无铅和无砷的光学眼镜的折射率为1.83&nlE; nd&nlE; 1.95,Abbé数为24&nlE;&ngr; d&nlE; 35,良好的耐化学性,优异的结晶稳定性和组成,以重量计。 基于氧化物含量%,SiO 2,2-8; B2O3,15-22; La2O3,35-42; ZnO,10-18; TiO2,9-15; ZrO2,3-10; Nb2O5,4-10; 和WO3,> 0.5-3。 除含有最多5wt。 GeO 2,Ag 2 O和BaO和常规澄清剂中的每一种的%,它们也可以最多含有5wt。 %的Al 2 O 3,MgO,CaO,SrO,P 2 O 5,最多至多5重量% %的组分F,Ta2O5。 玻璃优选不含碱金属氧化物Bi 2 O 3,Y 2 O 3,Gd 2 O 3和/或Yb 2 O 3。 还描述了由光学玻璃制成的光学元件。
摘要:
A method and a device for the continuous production of glass and glass ceramic products from a glass melt is provided, which simplifies the changing between two kinds of glass. The device includes a melting crucible and an induction coil, which preferably extends around the melting crucible in order to heat a glass melt by means of an induction field generated by the induction coil. The wall elements, which form the side wall of the crucible, have cooling channels, through which a cooling fluid can be conducted, so that the glass melt solidifies on the side wall and forms a skull layer. The interior side of the wall elements is formed at least in part by an aluminum nitride-containing ceramic.
摘要:
The invention discloses a standard for referencing luminescence signals, having an optically transparent base material comprising a lanthanum phosphate glass, a fluorophosphate glass, a fluor-crown glass, a lanthanum glass, a glass-ceramic formed therefrom or a lithium aluminosilicate glass-ceramic, the base material including a bulk doping with at least one constituent which is luminescent and comprises at least one rare earth and/or a nonferrous metal, in particular cobalt, chromium or manganese.
摘要:
The double crucible for a glass drawing method has a heatable outer crucible (1) and an inner crucible (2) surrounded by the outer crucible (1), which is heatable separately from the outer crucible (1). Both crucibles (1,2) have an outlet nozzle (1a, 2a) for the glass to be drawn. To make glass fibers from heavy metal oxide glass (HMO-glass) with higher quality and comparatively simple crucible features, the outlet nozzle (1a) of the outer crucible (1) extends a certain distance beyond the outlet nozzle (2a) of the inner crucible (2). Surfaces of the outlet nozzles coming in contact with the glass melt are polished and are provided on a material, which has a reducing action on heavy metal glass in the melt in all cases. These surfaces also have sufficient mechanical strength for and chemical inertness to heavy metal oxide glass.
摘要:
The invention concerns an optical colored glass with a composition (in percent by weight based on oxide) of SiO2 30–75; K2O 5–35; B2O3>4–17; ZnO 5–37; F 0.01–10; CdO 0.1–1, S+Se+Te 0.1–1.5 as well as the use of this glass as a long-pass cutoff filter.