Abstract:
Hollow ingots of transparent synthetic vitreous silica glass of external diameter greater than 400 mm and internal diameter greater than 300 mm are disclosed. The ingots are substantially free from bubbles or inclusions greater than 100 μm in diameter, have no more than 100 ppB of any individual metallic impurity, and have chlorine concentration less than 5 ppM. Also disclosed are methods for producing such ingots, in which a porous soot body of density greater than 0.4 g/cm3 is deposited on an oxidation resistant mandrel. The soot body is dehydrated on a mandrel comprising graphite, carbon fiber reinforced carbon, silicon carbide, silicon impregnated silicon carbide, silicon carbide-coated graphite or vitreous silica, either under vacuum or in the presence of a reducing gas, and then sintered to transparent pore-free glass under vacuum or in an atmosphere of helium.
Abstract:
A single-crystal silicon pulling silica container including: a transparent silica glass layer in the inner side of the silica container; and an opaque silica glass layer containing gaseous bubbles in the outer side of the silica container, wherein the transparent layer constitutes of a high-OH group layer placed on an inner surface side of the silica container containing the OH group at a concentration of 200 to 2000 ppm by mass and a low-OH group layer having the OH group concentration lower than the high-OH group layer containing Ba at a concentration of 50 to 2000 ppm by mass. Resulting in the silica container used for pulling single-crystal silicon, providing the silica container improves etching corrosion resistance of the container inner surface to silicon melt when the entire inner surface of transparent silica glass of the container is crystallized short after using the container and method for such silica container.
Abstract:
Methods for making active laser fibers include the production of an optical fiber with disturbed (or deviated) cylindrical symmetry on the glass surface of the fiber. The methods include a preform containing a central core made of glass. In one embodiment, the preform is circular and surrounded by additional glass rods and an outer glass jacket tube. In a first alternative embodiment, this preform is merged during fiber drawing. In a second alternative embodiment, the preform merged in a process forming a compact glass body with disturbed cylindrical symmetry. This compact preform is drawn into a fiber under conditions maintaining the disturbed cylindrical symmetry.
Abstract:
Hollow ingots of transparent synthetic vitreous silica glass of external diameter greater than 400 mm and internal diameter greater than 300 mm are disclosed. The ingots are substantially free from bubbles or inclusions greater than 100 μm in diameter, have no more than 100 ppB of any individual metallic impurity, and have chlorine concentration less than 5 ppM. Also disclosed are methods for producing such ingots, in which a porous soot body of density greater than 0.4 g/cm3 is deposited on an oxidation resistant mandrel. The soot body is dehydrated on a mandrel comprising graphite, carbon fibre reinforced carbon, silicon carbide, silicon impregnated silicon carbide, silicon carbide-coated graphite or vitreous silica, either under vacuum or in the presence of a reducing gas, and then sintered to transparent pore-free glass under vacuum or in an atmosphere of helium.
Abstract translation:公开了外径大于400mm,内径大于300mm的透明合成玻璃石英玻璃的中空铸锭。 锭基本上没有直径大于100um的气泡或夹杂物,具有不超过100ppB的任何单独的金属杂质,并且氯浓度小于5ppM。 还公开了生产这种锭的方法,其中密度大于0.4g / cm 3的多孔烟灰体沉积在抗氧化心轴上。 在真空下或在还原气体存在下,烟灰体在包括石墨,碳纤维增强碳,碳化硅,硅浸渍的碳化硅,碳化硅涂覆的石墨或玻璃状二氧化硅的心轴上脱水,然后烧结成透明 无孔玻璃在真空或氦气氛中。
Abstract:
A fused silica glass article having a low absolute refractive index and low concentrations of hydroxyl groups, halogens, and metal having a low absolute refractive index. The glass article contains less than about 10 ppm protium-containing and deuterium-containing hydroxyl groups by weight and less than about 20 ppm halogens by weight. The silica glass article also has an absolute refractive index (ARI) less than or equal to 1.560820. In one embodiment, the ARI of the fused silica article is achieved by lowering the fictive temperature of the fused silica. A method of lowering the fictive temperature is also described.
Abstract:
Disclosed are high purity synthetic silica glass material having a high OH concentration homogeneity in a plane perpendicular to the optical axis, and process of making the same. The glass has high refractive index homogeneity. The glass can have high internal transmission of at least 99.65%/cm at 193 nm. The process does not require a post-sintering homogenization step. The controlling factors for high compositional homogeneity, thus high refractive index homogeneity, include high initial local soot density uniformity in the soot preform and slow sintering, notably isothermal treatment during consolidation.
Abstract:
The present invention provides a synthetic quartz glass having a diameter of 100 mm or more for using in an optical apparatus comprising a light source emitting a light having a wavelength of 250 nm or less, the synthetic quartz glass having, in a region located inward from the periphery thereof by 10 mm or more in a plane perpendicular to the optical axis of the synthetic quartz glass: a birefringence of 0.5 nm or less per thickness of 1 cm with respect to a light having a wavelength of 193 nm; an OH group concentration of 60 ppm or less; an averaged differential OH group concentration from the center of the synthetic quartz glass toward a peripheral direction thereof, normalized with respect to the radius of the synthetic quartz glass, of −8 to +60 ppm; and an unbiased standard deviation a of a differential OH group concentration from the center of the synthetic quartz glass toward a peripheral direction thereof, normalized with respect to the radius of the synthetic quartz glass, of 10 ppm or less, the unbiased standard deviation a being determined with the following formula (1): σ = ∑ i = 1 n ( X i - X _ ) 2 n - 1 providing ; X i = Δ n _ OH i Δ r i * = n _ OH i - n _ OH i + 1 r i * - r i + 1 * ( 1 ) : differential OH group concentration at measurement point i normalized with respect to the radius R of the synthetic quartz glass; n _ OH i = n OH i - 1 + n OH i + n OH i + 1 3 : OH group concentration at measurement point i in terms of moving average for three points including the two points before and after the measurement point i; r i * = r i R : radius at measurement point i normarized with respect to the radius R of the synthetic quartz glass; X : average of OH group concentrations Xi in the whole evaluation region; and n : number of measurement points in the evaluation region (integer of 2 or more).
Abstract:
A fused silica glass having a composition for use in bulk IR optical applications. The fused silica glass has a OH concentration of less than 5 ppm (parts per million) by weight and an absorbance of less than about 50 ppm/cm at a wavelength of about 1.3 μm. A method of making the fused silica glass is also described.
Abstract:
A method produces a glass body that contains a reduced amount of OH groups in the metallic-oxide-containing glass layer and that has a reduced amount of transmission loss due to OH groups when the glass body is transformed into an optical fiber. The production method produces an optical glass body. An optical fiber contains the optical glass body in at least one part of its region for guiding a lightwave. The production method includes the following steps: (a) introducing into a glass pipe a gas containing an organometallic compound and a glass-forming material; (b) decomposing the organometallic compound into an organic constituent and a metallic constituent; (c) heating and oxidizing the metallic constituent so that produced glass particles containing a metallic oxide are deposited on the inner surface of the glass pipe to form a glass-particle-deposited layer; and (d) consolidating the deposited layer to form a metallic-oxide-containing glass layer.
Abstract:
The invention relates to a method for producing a blank mold from synthetic quartz glass by using a plasma-assisted deposition method, according to which a hydrogen-free media flow containing a glass starting material and a carrier gas is fed to a multi-nozzle deposition burner. The glass starting material is introduced into a plasma zone by the deposition burner and is oxidized therein while forming SiO2 particles, and the SiO2 particles are deposited on a deposition surface while being directly vitrified. In order to increase the deposition efficiency, the invention provides that the deposition burner (1) focuses the media flow toward the plasma zone (4) by. A multi-nozzle plasma burner, which is suited for carrying out the method and which is provided with a media nozzle for feeding a media flow to the plasma zone, is characterized in that the media nozzle (7) is designed so that it is focussed toward the plasma zone (4). The focussing is effected by a tapering (6) of the media nozzle (7).