摘要:
An object of the present invention is to provide an improved blank such that an optical member of a high homogeneity can be obtained therefrom, and to provide a vessel and a heat treatment method for heat-treating a highly uniform synthetic quartz blank. In a first aspect of the invention a special designed blank is provided showing a concave shaped outer surface. In a second aspect of the invention a special designed vessel for heat-treating blanks is provided, whereby the degree of heat emission at the center is set higher than that of the surroundings.
摘要:
A method for heat treating a synthetic quartz glass for optical use in a heating furnace, that comprises covering the surroundings of a synthetic quartz glass body with a SiO 2 powder having a mean dissolved hydrogen molecule concentration of 1 × 10 19 molecules/cm 3 or higher, and then heat treating the body.
摘要翻译:一种用于热处理光学用合成石英玻璃在加热炉方法,的确包括覆盖合成石英玻璃主体的周围用具有1×10 <19>分子/ cm <平均溶解氢分子浓度的SiO2粉末 3>或更高,然后热处理所述体。
摘要:
An object of the present invention is to provide an improved blank such that an optical member of a high homogeneity can be obtained therefrom, and to provide a vessel and a method of heat-treating a highly uniform synthetic quartz glass blank. In a first aspect of the invention a special designed synthetic silica glass blank is provided showing a concave shaped outer surface. In a second aspect of the invention a special designed vessel for heat-treating blanks is provided, whereby the degree of heat emission at the center is set higher than that of the surroundings. The ultimate use of the blank is as an optical element for use in excimer laser lithographic processes and apparatus.
摘要:
In the light of the disadvantages of the prior art technology, an object of the present invention is to provide a method for producing a synthetic quartz glass member for excimer lasers, which comprises, while suppressing the generation of reductive defects which impairs the resistance against laser radiations, incorporating a sufficient amount of hydrogen molecules capable of achieving a high resistance against laser radiation into the quartz glass, yet uniformly incorporating the hydrogen molecules to realize a flat distribution in refractive indices attributed to the distribution in the density of hydrogen molecules. It is also an object of the present invention to provide a synthetic quartz glass member for excimer lasers obtained by the production method above, which yields high resistance against laser radiations and homogeneity. The above problems have been overcome by a method for producing a synthetic quartz glass member for excimer lasers comprising a step of incorporating hydrogen molecules into a synthetic quartz glass body by heat treating the synthetic quartz glass body at a temperature of 600 °C or lower under an atmosphere in a pressure range of 1 atm or higher but lower than 150 atm and containing hydrogen, said method comprises varying the pressure of the gas containing hydrogen either continuously or stepwise in at least a part of the heat treatment.
摘要:
An object of the invention is to provide a synthetic quartz glass material for use in constructing optics for transmitting ArF excimer laser radiations having an energy density per pulse in a range of from 0.001 to 0.5 mJ/cm 2 , particularly suitable for use in constructing lenses, prisms, windows, and the like for semiconductor wafer aligners, which yields small change in birefringence in case laser is irradiated. The objects above have been accomplished by a synthetic quartz glass material for use in the optics of an ArF aligner transmitting ArF excimer laser radiations having an OH group concentration of 5 ppm or higher but not higher than 300 ppm, and a hydrogen molecule concentration of 1 × 10 16 molecules/cm 3 or higher but lower than 2 × 10 17 moleculues/cm 3 , which yields an energy density per pulse in a range of from 0.001 to 0.5 mJ/cm 2 , having a uniformity in refraction index Δn of 1 × 10 -6 or lower, a birefringence of 1 nm/cm or lower, and an internal transmittance for ultraviolet radiation 193.4 nm in wavelength of 99.7 % or higher.
摘要翻译:本发明的目的是提供一种合成石英玻璃材料,用于构建用于传输具有0.001至0.5mJ / cm 2范围内的每脉冲能量密度的ArF准分子激光辐射的光学器件,特别适用于 构造用于半导体晶片对准器的透镜,棱镜,窗等,其在激光被照射的情况下产生双折射的小的变化。 上述目的已经通过用于ArF对准器的光学器件中的合成石英玻璃材料来实现,该ArF对准器透射具有OH基浓度为5ppm或更高但不高于300ppm,并且氢分子浓度为1的ArF准分子激光辐射 x 10 16分子/ cm 3或更高但低于2×10 17分子/ cm 3,其产生每个脉冲的能量密度在0.001至0.5mJ / cm 2的范围内 具有1×10 -6以下的折射率DELTA n的均匀性,1nm / cm以下的双折射和99.7%以上的波长的紫外线的内部透射率为193.4nm。