Abstract:
A method for manufacturing an optical fiber preform including a dehydration process by photochemical reaction is provided. The method performs forming a clad and a core according to a predetermined refractive index profile by repeated deposition and sintering of soot particles by means of oxidation of soot generation gas, and a dehydration step for removing moisture and hydroxyl groups from a soot deposition region by means of photochemical reaction is executed between the deposition and sintering. The dehydration step activates dehydration gas into ionic or atomic state by irradiating light, in a wavelength range capable of inducing activation of the dehydration gas, from light source to the dehydration gas including chlorine and supplied to the soot deposition region, and then adsorbs the activated dehydration gas onto surface of the soot in order to induce dehydration reaction with moisture or hydroxyl groups.
Abstract:
A method for making silica includes delivering a silica precursor comprising a perfluorinated group to a conversion site and passing the silica precursor through a conversion flame to produce silica soot.
Abstract:
A method for forming EUV Lithography large dimension homogeneous glass body is disclosed which includes delivering a silica precursor (28) to a burner (16) and passing the silica precursor (16) through the flame (36) of the burner (16) to form silica particles (38), depositing the silica particles (38) on a planar surface (14) to form a flat porous EUV Lithography large dimension preform (40) and consolidating the flat porous EUV Lithography large dimension preform (40) into a flat dense EUV Lithography large dimension homogeneous glass body.
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 doped glass (20) is made by providing an O 2 doping atmosphere (26) to a silicon oxyfluoride glass (22) in a doping vessel (28). 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 O 2 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 contains intersticial O 2 molecules which provide improved endurance to laser exposure. Preferably the O 2 doped silicon oxyfluoride glass is characterized by having less than 1x10 17 molecules/cm3 of molecular hydrogen and low chlorine levels.
Abstract:
Optical waveguide fiber having low water peak as well as optical waveguide fiber preforms and methods of making optical waveguide fiber preforms from which low water peak and/or low hydrogen aged attenuation optical waveguide fibers are formed, including optical waveguide fiber and preforms made via OVD. The fibers may be hydrogen resistant, i.e. exhibit low hydrogen aged attenuation. A low water peak, hydrogen resistant optical waveguide fiber is disclosed which exhibits an optical attenuation at a wavelength of about 1383 nm which is less than or equal to an optical attenuation exhibited at a wavelength of about 1310 nm.
Abstract:
High purity direct deposit vitrified 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 direct deposit vitrified 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 direct deposit vitrified silicon oxyfluoride glass which exhibits very high transmittance in the vacuum ultraviolet (VUV) wavelength region while maintaining the excellent thermal and physical properties generally associated with high purity fused silica. In addition to containing fluorine and having little or no OH content, the inventive direct deposit vitrified silicon oxyfluoride glass suitable for use as a photomask substrate at 157 nm is also characterized by having less than 1x10 molecules/cm of molecular hydrogen and low chlorine levels.
Abstract translation:公开了适用于在190nm以下的VUV波长区域中用于光刻应用的光掩模基板的高纯度直接沉积玻璃化硅氧氟化物玻璃。 本发明的直接沉积玻璃化硅氧氟化物玻璃在157nm波长附近是透射的,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在真空紫外(VUV)波长区域中显示非常高的透射率的干直接沉积玻璃化硅氧氟化物玻璃,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,本发明的适用于157nm的光掩模衬底的玻璃化玻璃化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:
According to a known method for producing an optical fibre by drawing from a blank with a cladded core structure or from a coaxial arrangement of components forming a cladded core structure, a core cylinder is produced in a soot deposition method, said core cylinder having a core glass layer with a higher index of refraction >" k " k " M1 " M1 " M1 " k
Abstract:
A synthetic quartz glass being used for a light having a wavelength of 150 to 200 nm, which has a concentration of OH group of 100 ppm or less, a concentration of hydrogen molecules of 1 x 10 molecules/cm or less and defects of reducing type of 1 x 10 /cm or less, and exhibits a relationship of DELTA K163 and DELTA K190 before and after irradiation of ultraviolet rays which satisfies 0
Abstract translation:将合成石英玻璃用于波长为150〜200nm的光,OH基浓度为100ppm以下,氢分子浓度为1×10 17分子/ cm 3或 减少1×10 15 / cm 3以下的还原型的缺陷,并且在照射紫外线之前和之后呈现DELTA K163和DELTA K190的关系,满足0
Abstract:
A synthetic quartz glass to be used for vacuum ultraviolet lights having a wavelength of 175 nm or less which is characterized in that it has an OH group content of 100 ppm or less and is substantially free of reducing type defects.
Abstract:
A synthetic quartz glass optical member for an ultraviolet laser, suitably applicable as a stepper lens of a lithographer using an excimer laser beam and other optical members, wherein the quartz glass has a hydroxyl content of 10 to 100 ppm, a chlorine content of 200 ppm or less, a hydrogen content of 1 x 1016 molecules/cm3 or less, a homogeneity of refractive index of 5 x 10-6 or less in terms of Δn, and a birefringence of 5 nm/cm or less. The optical member can be produced by subjecting a volatile silicon compound to flame hydrolysis with oxyhydrogen flame, depositing the formed particulate silica on a heat-resistant support to prepare a porous silica matrix, heating the matrix in a vacuum as high as 1 x 10-2 Torr or above to a temperature of 1,400 °C or above to effect dehydration and degassing, homogenizing the resultant transparent quartz glass into highly homogeneous quartz glass free from striae in at least one direction, molding the highly homogeneous quartz glass, and annealing the molded glass.