334 results about "Spectral transmittance" patented technology

Provided are near-infrared light-absorbing glass in which good color compensating characteristics are maintained even without containing harmful arsenic, permitting the thinning of the glass, and having good weatherability and forming properties; a near-infrared light-absorbing element comprised of such glass; a near-infrared light-absorbing filter employing such glass. Also provided, at low cost, are near-infrared light-absorbing glass permitting good color compensating, a near-infrared light-absorbing element comprised of such glass, and a near-infrared light-absorbing filter comprising such elements. The glass comprises cationic components with a certain composition as well as F<-> and O<2-> as anionic components. Alternatively, the glass is near-infrared light-absorbing glass, wherein the glass exhibits properties, based on a thickness of 0.5 mm, in the spectral transmittance of wavelengths of 400 to 700 nm, that wavelength, at which a 50 percent transmittance is exhibited, is less than 630 nm, transmittance at a wavelength longer than said wavelength is less than 50 percent, transmittance at a wavelength shorter than said wavelength is higher than 50 percent and the viscosity at a liquid phase temperature is 0.5 Pa.s or more. The near-infrared light-absorbing element is comprised of such glass. The near-infrared light-absorbing filter comprises a glass plate comprised of such glass. Alternatively, the glass is comprised of fluorophosphate glass or phosphate glass, and comprises 0.1 weight percent or more of copper based on CuO, 0.005 to 0.5 weight percent of iron based on Fe2O3, 0.01 to 1 weight percent of antimony based on Sb2O3, and no arsenic.

An attenuating filter provides a prescribed attenuation of the intensity of transmitted, short-wavelength, ultraviolet light, in particular, at wavelengths below 200 nm, that is governed by a predefinable spatial distribution of its spectral transmittance. The filter has a transparent substrate (3), e.g. fabricated from crystalline calcium fluoride. A filter coating (5) fabricated from a dielectric material that absorbs over a predefined wavelength range is applied to at least one surface (4) of the substrate. In the case of operating wavelengths of about 193 nm, the filter coating consists largely of tantalum pentoxide. Filters of the type, which may be inexpensively fabricated with high yields, are noted for their high abilities to withstand laser radiation and may be effectively antireflection coated employing simply designed antireflection coatings.