Abstract:
Fahrzeug-Verbundglas zur Abtrennung eines Fahrzeuginnenraums von einer äußeren Umgebung, mindestens umfassend: -eine Innenscheibe (1) aus Glas mit einer Dicke von kleiner oder gleich 0,4 mm, -eine Außenscheibe (2) aus Glas mit einer Dicke von größer oder gleich 1,5 mm und -eine akustisch dämpfende Zwischenschicht(3), welche die Innenscheibe (1) mit der Außenscheibe (2) verbindet, wobei -die akustisch dämpfende Zwischenschicht (3) mindestens zwei äußere polymere Schichten (3.1) und eine zwischen diesen liegende innere polymere Schicht (3.2) umfasst und die äußerenpolymeren Schichten (3.1) eine niedrigere Elastizität oder Plastizität als die innere polymere Schicht (3.2) aufweisen, -die innere polymere Schicht (3.2) eine Dicke von 0,05 mm bis 0,40 mm aufweist, -die äußeren polymeren Schichten (3.1) eine Dicke von 0,20 mm bis 0,60 mm aufweisen und -die Gesamtdicke der akustisch dämpfenden Zwischenschicht (3) mindestens 0,70 mm beträgt.
Abstract:
A method of forming an alkali metal oxide-doped optical fiber by diffusing an alkali metal into a surface of a glass article is disclosed. The silica glass article may be in the form of a tube or a rod, or a collection of tubes or rods. The silica glass article containing the alkali metal, and impurities that may have been unintentionally diffused into the glass article, is etched to a depth sufficient to remove the impurities. The silica glass article may be further processed to form a complete optical fiber preform. The preform, when drawn into an optical fiber, exhibits a low attenuation.
Abstract:
A photosensitive glass made of a ternary compound SiO2:SnO2:R2O where R is a Group I element such as Na, K or Li. The addition of an oxide of a Group I element increases the solubility of tin oxide in a silica matrix and produces a glass which is highly photosensitive and in which optically written refractive index modulations have remarkable temperature stability (solid circles) at least as good as that of the binary glass SiO2:SnO2 (open circles) and much superior to that of conventional germanosilicate glass (solid triangles) or borogermanosilicate glass (open triangles). The inclusion of the Group I oxide effectively increases the solubility of tin oxide in the non-crystalline silica matrix well above the 1 % limit of SiO2:SnO2 photosensitive glass, at which Sn would normally crystallise in the oxide. By contrast to boron or phosphorous co-dopants, the introduction of the Group I element does not appear to cause any increase in the background refractive index, allowing the manufacture of waveguide devices compatible with standard telecommunication fibres.
Abstract:
A ultralow-loss silica glass characterized by comprising a high-purity silica glass and at least one network-modifying oxide in an amount of 1 to 500 ppm (by weight). The oxide is considered to suitably relax the tetrahedral network structure of silica so as to lower the Rayleigh scattering loss. Examples of the network modifying oxides usable herein include Na>2 2 2
Abstract:
The invention relates to a method for producing a silica glass body, comprising the method steps: i.) providing silicon dioxide particles ii.) forming a glass melt from the silicon dioxide particles in a furnace and iii.) forming a silica glass body from at least one portion of the glass melt, wherein the furnace has a gas outlet, through which gas can be removed from the furnace and the dew point of the gas exiting the furnace through the gas outlet is less than 0°C. The invention also relates to a silica glass body that can be obtained by said method. In addition, the invention relates to a light guide, a lighting means and a shaped article, each of which can be obtained by further processing the silica glass body. The invention further relates to the adjustment of the dew point at the outlet of a furnace, comprising: providing a starting material in the furnace; operating said furnace, a gas flow being conducted through the furnace; and varying the residual moisture of the starting material or the gas exchange rate of the gas flow.
Abstract:
Die Erfindung betrifft ein Verfahren zum Herstellen eines Quarzglaskörpers beinhaltend die Verfahrensschritte i.) Bereitstellen von Siliziumdioxidpartikeln, ii.) Bilden einer Glasschmelze aus den Siliziumdioxidpartikeln in einem Ofen und iii.) Bilden eines Quarzglaskörpers aus zumindest einem Teil der Glasschmelze, wobei der Ofen einen Gasauslass aufweist, durch den Gas dem Ofen entnommen wird, wobei der Taupunkt des Gases beim Austritt aus dem Ofen durch den Gasauslass weniger als 0°C beträgt. Die Erfindung betrifft weiterhin einen Quarzglaskörper, der durch dieses Verfahren erhältlich ist. Weiterhin betrifft die Erfindung einen Lichtleiter, ein Leuchtmittel und einen Formkörper, die jeweils durch Weiterverarbeiten des Quarzglaskörpers erhältlich sind.
Abstract:
A doped silica-titania glass article is provided that includes a glass article having a glass composition comprising (i) a silica-titania base glass, (ii) a fluorine dopant, and (iii) a second dopant. The fluorine dopant has a concentration of fluorine of up to 5 wt. % and the second dopant comprises one or more oxides selected from the group consisting of Al, Nb, Ta, B, Na, K, Mg, Ca and Li oxides at a total oxide concentration from 50 ppm to 6 wt.%. Further, the glass article has an expansivity slope of less than 0.5 ppb/K2 at 20⃘C. The second dopant can be optional. The composition of the glass article may also contain an OH concentration of less than 100 ppm.