Optical filter material made of gallium-doped quartz glass, filter component and method for irradiation by means of a UV radiation source
AssigneeHeraeus Quarzglas GmbH & Co. KG
InventorChristian Neumann
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Abstract
The invention relates to an optical filter material made of doped quartz glass, which at a low dopant concentration exhibits spectral transmission as high as possible of at least 80% cm−1 for operating radiation of 254 nm, transmission as low as possible in the wave range below approximately 250 nm, and an edge wavelength λc within the wave range of 230 to 250 nm. It was found that this aim is achieved by doping comprising a gallium compound, which in the wave range below 250 nm has a maximum of an absorption band and thus determines the edge wave range λc.
Claims22
An optical filter material comprising doped quartz glass, which for UV operating radiation of a wavelength of 254 nm exhibits a spectral transmission of at least 80% cm−1 and has an edge wavelength λc in a wavelength range of 230 nm to 250 nm, wherein the edge wavelength λc is produced by doping with a gallium compound that has a maximum of an absorption band in a wavelength range below 250 mm.
A method for irradiating a surface, a liquid or a gas comprising:
- providing a UV radiation source that emits operating radiation of a wavelength around 254 nm, and causing said operating radiation to pass which passes through a filter material of doped quartz glass that for the operating radiation exhibits a spectral transmission of at least 80% cm−1 and has an edge wavelength λc in a wavelength range of 230 nm to 250 nm, wherein the edge wavelength λc is produced by doping comprising a gallium compound that has an absorption band with a maximum in a wavelength range below 250 nm.
Dependencies are inferred from the claim text.