Abstract:
High purity silicon oxyfluoride glass suitable for use as a photomask substrates for photolithography applications in the VUV wavelength region below 190 nm is disclosed with the silicon oxyfluoride glass having a preferred fluorine content
Abstract translation:公开了具有优选氟含量<0.5重量%的氟氧化硅玻璃,适合用作光刻应用中的低于190nm的VUV波长区域的光掩模基板的高纯度氟氧化硅玻璃。 本发明的氟氧化硅玻璃在157nm波长下是透射的,使其特别适用于157nm波长区域的光掩模衬底。 本发明的光掩模基材是“真空”的氟氧化硅玻璃,其在真空紫外(VUV)波长区域中表现出非常高的透射率,同时保持通常与高纯度熔融石英相关的优异的热和物理性能。 除了含氟并且具有很少或不具有OH含量之外,本发明的适合用作157nm的光掩模衬底的氟氧化硅玻璃的特征还在于具有小于1×10 17分子/ cm 3的分子氢和低 氯水平。
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 process for producing synthetic quartz glass using a burner composed of a plurality of concentric nozzles involves the steps of feeding a silica-forming raw material gas and a fluorine compound gas to a reaction zone from a center nozzle, feeding oxygen gas from a second nozzle outside the center nozzle, and feeding oxygen gas and/or hydrogen gas from a third nozzle. The silica-forming raw material gas is hydrolyzed to form fine particles of silica, which particles are deposited on a rotatable substrate so as to form a porous silica matrix, which is then fused to give the quartz glass. The flow rate of the oxygen gas fed from the second nozzle and the flow rate of the raw material gas are controlled so as to provide a 1.1- to 3.5-fold stoichiometric excess of oxygen. The excess oxygen suppresses Si—Si bond formation in the quartz glass, enabling the production of synthetic quartz glass having a high transmittance in the vacuum ultraviolet region.
Abstract:
In a known procedure for the manufacture of an optical fiber by drawing from a preform with a core-clad structure or from a coaxial arrangement of several components forming a core-clad structure, a core cylinder is produced with a soot deposition method, with the core cylinder having a core glass layer of a higher refractive index, nullnKnull, and outer diameter, nulldKnull, said core glass layer being encased by a first cladding glass layer having a lower refractive index, nullnM1null, and outer diameter, nulldM1null, followed by applying a second cladding glass layer onto the core cylinder. The modification of this procedure according to the invention is characterized by its lower optical fiber production costs. This is achieved by providing the second cladding glass layer (4) in the form of a cladding tube manufactured in a separate step of the procedure, said cladding tube having a mean OH concentration of max. 1 wt.-ppm, and applying the second cladding glass layer (4) by collapsing the cladding tube onto the core cylinder (2; 3), and by using a core cylinder with a nulldM1null/nulldKnull ratio between 1 and 2.2 and a mean OH concentration of max. 1 wt-ppm in its superficial area up to a depth of 10 nullm (FIG. 1).
Abstract:
An optical fiber is formed by performing vapor phase deposition of SiO2 on the outside of a glass rod comprising a core section and a first cladding section and drawing a glass preform which formed by a second cladding section. Also, a single mode optical fiber is manufactured so that the ratio of the diameter D of the first cladding section and the diameter d of the core section is in a range of 4.0 to 4.8, and OH concentration is 0.1 ppm or less. Also, an optical fiber is manufactured so that a value of D/d>4.8, and the OH concentration is 0.1 ppm or less. It is thereby possible to maintain an initial loss in the 1380 nm wavelength range even if hydrogen diffusion occurs.
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:
The invention provides coated optical lithography elements and methods of coating optical elements, and particularly optical photolithography elements for use in below 240 nm optical photolithography systems utilizing vacuum ultraviolet light (VUV) lithography wavelengths no greater than about 193 nm, such as VUV projection lithography systems utilizing wavelengths in the 193 nm or 157 nm region. The optical devices manipulate vacuum ultraviolet lithography light less than 250 nm utilizing a deposited silicon oxyfluoride film. The deposited silicon oxyfluoride optical coating assists in the manipulation of incident light and protects the underlying optical materials, layers, and surfaces.
Abstract:
The invention provides a low cost method of manufacturing high capacity preforms by chemical vapor deposition. More particularly, there is described a method of manufacturing an optical fiber preform, which method comprises the steps of providing a substrate tube of silica doped with sufficient chlorine to obtain an OH concentration of less than 100 ppb and doped with sufficient fluorine proportional to the chlorine doping to obtain a refractive index that is lower than that of a natural silica, depositing inner cladding and an optical core inside the substrate tube, collapsing the substrate tube to form a primary preform, and depositing outer cladding of said natural silica on the resulting primary preform. The invention is applicable to manufacturing optical fibers.
Abstract:
High purity silicon oxyfluoride glass suitable for use as a photomask substrates for photolithography applications in the VUV wavelength region below 190 nm is disclosed. The inventive silicon oxyfluoride glass is transmissive at wavelengths around 157 nm, making it particularly useful as a photomask substrate at the 157 nm wavelength region. The inventive photomask substrate is a nulldry,null silicon oxyfluoride glass which contains doped O2 molecules and which exhibits very high transmittance and laser transmission durability in the vacuum ultraviolet (VUV) wavelength region. In addition to containing fluorine and having little or no OH content, the inventive silicon oxyfluoride glass suitable for use as a photomask substrate at 157 nm contains intersticial O2 molecules which provide improved endurance to laser exposure. Preferably the O2 doped silicon oxyfluoride glass is characterized by having less than 1null1017 molecules/cm3 of molecular hydrogen and low chlorine levels.
Abstract:
A silica glass optical material for transmitting light with a wavelength of from 155 to 195 nm emitted from an excimer laser or an excimer lamp, which comprises silica glass optical material of ultrahigh purity, containing from 1 to 100 wtppm of OH groups, from 5×1016 to 5×1019 molecules/cm3 of H2, and from 10 to 10,000 wtppm of F, but substantially free from halogens other than F, and having a fluctuation in refractive index, &Dgr;n, of from 3×10−6 to 3×10−7.
Abstract translation:一种二氧化硅玻璃光学材料,用于从准分子激光或准分子灯发射波长为155至195nm的光,其包括含有1至100重量ppm的OH基团的超高纯度的石英玻璃光学材料,从5×10 16至 5×1019分子/ cm 3的H 2和10至10,000重量ppm的F,但基本上不含F以外的卤素,并且具有3×10 -6至3×10 -7的折射率DELTAn。