Abstract:
First of all, there is provided a production process of a synthetic quartz glass which has less impurity, has a high-temperature viscosity characteristic equal to or more than that of a natural quartz glass, and hardly deforms even in a high-temperature environment, and especially a production process of a highly heat resistant synthetic quartz glass which is free from the generation of bubbles and is dense. Secondly, there is provided a highly heat resistant synthetic quartz glass body which is easily obtained by the production process of the present invention, and especially a transparent or black quartz glass body which is free from the generation of bubbles, is dense, has high infrared absorption rate and emission rate, and has an extremely high effect for preventing diffusion of alkali metal. The process is a process of producing a highly heat resistant quartz glass body having an absorption coefficient at 245 nm of 0.05 cm−1 or more, and the silica porous body was subjected to a reduction treatment, followed by baking, thereby forming a dense glass body.
Abstract:
Provided are an optical fiber which exhibits a small increment of loss due to the OH group and which is suitable for transmitting signals in a band including a wavelength of 1,380 nm, and methods for manufacturing such optical fiber, an optical fiber preform, and a fluorine doped silica glass article. The fluorine doped silica glass article is produced by (1) depositing silica glass soot on a starting substrate to produce a silica glass soot deposit body and (2) heating the silica glass soot deposit body in an atmosphere including at least a first gas containing fluorine atoms and a second gas having deoxidizing property and containing no fluorine atom nor hydrogen atom. An optical fiber preform and an optical fiber are produced by the use of this glass body. The optical fiber has a clad containing fluorine and exhibits a transmission loss of 0.32 dB/km or less at a wavelength of 1,380 nm.
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:
The present invention concerns a quartz glass blank for an optical component for the transmission of ultraviolet radiation of a wave length of 250 nm and under, as well as its utilization in microlilthography in connection with ultraviolet radiation of a wavelength of 250 nm and under. Such quartz glass blank is to have low induced absorption, while being optimized in respect of compaction and de-compaction. The quartz glass blank according to the invention has the following properties: A glass structure essentially free of oxygen defect sites; a H2 content in the range of 3null1017 molecules/cm3 to 2.0null1018 molecules/cm3; an OH content in the range of 500 weight ppm to 1000 weight ppm; a SiH group content of less than 2null1017 molecules/cm3; a chlorine content in the range of 60 weight ppm to 120 weight ppm; a refractive index inhomogeneity, nulln, of less than 2 ppm; and a stress birefringence of less than 2 nm/cm. For utilization according to the invention, the quartz glass blanknullin respect of its minimum and maximum hydrogen content, CH2min and CH2max, as well as its OH content COHnullis in accordance with the scaling laws (2), (3) and (4), with P standing for the pulse number and null for the energy density: CH2min nullmolecules/cm3nullnull1.0null108null2Pnullnull(2), CH2max nullmolecules/cm3nullnull2null1019nullnullnull(3), COH nullweight ppmnullnull1700null nullmJ/cm2null0.4null50nullnull(4).
Abstract translation:本发明涉及一种用于传输波长为250nm及以下的紫外线辐射的光学部件的石英玻璃坯料,以及其在与250nm及以下的波长的紫外线辐射相关的微立体图谱中的应用。 这种石英玻璃坯料具有低的诱导吸收,同时在压实和去压实方面被优化。 根据本发明的石英玻璃坯料具有以下特性:基本上不含氧缺陷部位的玻璃结构; 在3×10 17分子/ cm 3至2.0×10 18分子/ cm 3范围内的H 2含量; 在500重量ppm至1000重量ppm的范围内的OH含量; SiH基含量小于2×10 17分子/ cm3; 氯含量在60重量ppm至120重量ppm的范围内; 折射率不均匀性,DELTAn小于2ppm; 应力双折射小于2nm / cm。 对于根据本发明的利用,石英玻璃坯料在其最小和最大氢含量,CH 2 min和CH 2 max以及其OH含量COH-方面符合定标法(2),(3)和( 4),其中P代表能量密度的脉冲数和εi:CH 2min [分子/ cm 3] = 1.0×10 8epsi 2 P(2),CH 2 max [分子/ cm 3] = 2×10 19秒(3),COH [重量ppm] = 1700秒[ mJ / cm 2] 0.4±50(4)。
Abstract:
A silica glass has a structure determination temperature of 1200 K or lower and an OH group concentration of at least 1,000 ppm. The silica glass is used for photolithography together with light in a wavelength region of 400 nm or shorter.
Abstract:
Fluorine-containing glass which comprises silica and contains, in said silica, not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, said fluorine-containing glass having a concentration ratio of F/Cl of 100 or more. Also disclosed is fluorine-containing glass which contains not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, and has a concentration ratio of F/Cl of 1000 or more.
Abstract:
An optical article including a core; at least one cladding layer; and a narrow fluorine reservoir between the core and the cladding layer. The fluorine reservoir has a higher concentration of fluorine than either the cladding layer or the core. One particular embodiment includes a core including a halide-doped silicate glass that comprises approximately the following in cation-plus-halide mole percent 0.25-5 mol % Al2O3, 0.05-1.5 mol % La2O3, 0.0005-0.75 mol % Er2O3, 0.5-6 mol % F, 0-1 mol % Cl.
Abstract translation:一种包括芯的光学制品; 至少一层包层; 以及在芯和包层之间的窄氟储存器。 氟储存器具有比包覆层或芯层更高的氟浓度。 一个具体实施方案包括包含卤化物掺杂的硅酸盐玻璃的核,其在阳离子加 - 卤化物摩尔百分比为0.25-5摩尔%Al 2 O 3,0.05-1.5摩尔%La 2 O 3,0.0005-0.75摩尔%Er 2 O 3,0.5-6 mol%F,0-1mol%Cl。
Abstract:
This invention relates to an optical fiber having a structure that effectively reduces transmission loss and bending loss. An optical fiber according to this invention is an optical fiber mainly comprised of silica and including a core region and a cladding region covering the core region. The core region is doped with chlorine so as to have a refractive index higher than that of pure silica. The cladding region is doped with fluorine so as to have a refractive index lower than that of pure silica. The optical fiber, in particular, is characterized in that a peak value of a relative refractive index difference of the core region with respect to a refractive index of pure silica is 0.05% or more.
Abstract:
A process is described for making silica powder by a sol-gel process whereby an aqueous suspension is made of a silica-based raw material which includes particles containing chlorine, the pH of the suspension is adjusted to a value from 3 to 4.5 if necessary, the suspension is gelled, the gel obtained is dried and the dried gel is fractionated into silica granules. The silica-based raw material preferably includes particles containing chlorine having a specific surface area less than 80 m2/g and less than 5 wt. % relative to the total quantity of particles containing chlorine of silica particles having a specific surface area from 150 m2/g to 300 m2/g. The use of such powder to manufacture an optical fiber preform is also described.
Abstract:
Fluorine-containing glass which comprises silica and contains, in said silica, not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, said fluorine-containing glass having a concentration ratio of F/Cl of 100 or more. Also disclosed is fluorine-containing glass which contains not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, and has a concentration ratio of F/Cl of 1000 or more.