Abstract:
In the nanoimprint lithography, titania-doped quartz glass having an internal transmittance distribution of up to 10% at wavelength 365 nm is suited for use as nanoimprint molds.
Abstract:
The glass composition of the present invention is an inorganic glass composition in which the volume ratio of helium with a mass number of 3 to helium with a mass number of 4, namely 3He/4He in the glass (0° C., 1 atm) is smaller than the volume ratio 3He/4He in the atmosphere. The method of producing a glass article of the present invention includes the steps of: melting a glass raw material by heating; homogenizing molten glass; forming the molten glass into a desired shape; and cooling the shaped glass to room temperature, in which helium with a certain mass ratio is dissolved in the glass material so that the glass article of the present invention is obtained.
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:
In a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, the density of non bridging oxygen hole center in the glass part is not higher than 1.0×1014 spins/g in terms of the spin density measured by an electron spin resonance method.
Abstract:
In a single mode optical fiber formed of a silica-based glass and including a glass part having a central core and a cladding region, the density of non bridging oxygen hole center in the glass part is not higher than 1.0×1014 spins/g in terms of the spin density measured by an electron spin resonance method.
Abstract:
A method for making extreme ultraviolet lithography tool glass substrates includes generating a plasma, delivering reactants comprising a silica precursor and a titania precursor into the plasma to produce titania and silica particles, and depositing the titania and silica particles on a deposition surface to form a homogeneous titania-doped silica. The invention provides for homogeneous glass substrates that are free of striae variations and provides for beneficial extreme ultraviolet lithography reflective optics.
Abstract:
An isotopically-altered, silica based optical fiber is provided having lower losses, broader bandwidth, and broader Raman gain spectrum characteristics than conventional silica-based fiber. A heavier, less naturally abundant isotope of silicon or oxygen is substituted for a lighter, more naturally abundant isotope to shift the infrared absorption to a slightly longer wavelength. In one embodiment, oxygen-18 is substituted for the much more naturally abundant oxygen-16 at least in the core region of the fiber. The resulting isotopically-altered fiber has a minimum loss of 0.044 dB/km less than conventional fiber, and a bandwidth that is 17 percent broader for a loss range between 0.044-0.034 dB/km. The fiber may be easily manufactured with conventional fiber manufacturing equipment by way of a plasma chemical vapor deposition technique. When a 50 percent substitution of oxygen-18 for oxygen-16 is made in the core region of the fiber, the Raman gain spectrum is substantially broadened.
Abstract translation:提供了一种同位素改性的二氧化硅基光纤,其比传统的二氧化硅基光纤具有更低的损耗,更宽的带宽和更广泛的拉曼增益光谱特性。 更重,更不自然丰富的硅或氧的同位素代替较轻的,更自然的丰富的同位素,以将红外吸收转移到稍长的波长。 在一个实施方案中,氧-18至少在纤维的核心区域中替代天然丰富的氧-16。 所得到的同位素改变的光纤比常规光纤的损耗最小为0.044 dB / km,对于0.044-0.034 dB / km之间的损耗范围,宽带宽为17%。 纤维可以通过等离子体化学气相沉积技术容易地用传统的纤维制造设备制造。 当在纤维的纤芯区域中进行氧-16取代氧-16的50%时,拉曼增益谱显着扩大。
Abstract:
A method of producing a polarizing glass article that exhibits a broad band of high contrast polarizing properties in the infrared region of the radiation spectrum. The polarizing glass is phase-separated or exhibits photochromic properties based on silver, copper, or copper-cadmium halide crystals or a combination thereof, which are precipitated in the glass and having a size in the range of 200-5000 Å. The glass has a surface layer containing elongated silver, copper, or copper cadmium metal particles, or a mixture thereof. The method comprises subjecting the glass article to a time-temperature cycle in which the temperature is at least about 76° C. or greater above the glass softening point, in a step to thermally form and precipitate large halide crystals, and elongated metallic particles under a stress of not over about 3000 psi, preferably not over about 2675 psi.
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 “dry,” 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 1×1017 molecules/cm3 of molecular hydrogen and low chlorine levels.
Abstract:
A method of producing a polarizing glass article that exhibits a broad band of high contrast polarizing properties in the infrared region of the radiation spectrum. The polarizing glass is phase-separated or exhibits photochromic properties based on silver, copper, or copper-cadmium halide crystals or a combination thereof, which are precipitated in the glass and having a size in the range of 200-5000 null. The glass has a surface layer containing elongated silver, copper, or copper cadmium metal particles, or a mixture thereof. The method comprises subjecting the glass article to a time-temperature cycle in which the temperature is at least about 76null C. or greater above the glass softening point, in a step to thermally form and precipitate large halide crystals, and elongated metallic particles under a stress of not over about 3000 psi, preferably not over about 2675 psi.