376 results about "Phosphate glass" 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.

Disclosed are zinc niobium phosphate glasses consisting essentially, expressed in terms of mole percent on the oxide basis of, 40-65% P2O5, 25-37% ZnO, 0.1-15% Nb2O5, 0-6% Al2O3, 0-5% Bi2O3, 0-3% Na2O and 0-5% B2O3, said glass exhibiting glass transition temperature below 450° C., a dilatometer softening point below 500° C., coefficient of expansion in the range of 80-120×10−7° C.−1, good chemical durability and blue color. The glass of the present invention is useful for sealing optical fiber to ferrule by local heating.

A new ytterbium-phosphate glass and a method for producing the same are disclosed. The glass finds special use in forming laser glass. Previously the level of ytterbium that could be incorporated into a phosphate glass without leading to formation of crystals or devitrification was limited. It has been found that much higher levels of ytterbium can be incorporated if an initial glass melt is formed from phosphate and ytterbium prior to adding the other components. Using the present process ytterbium-phosphate glasses having up to 30 mole percent ytterbium can be created. The new glasses function as well and often better than previous ytterbium containing glasses as laser glasses especially when combined with one or more of the lasing ions erbium oxide, neodymium oxide, holmium oxide or thulium oxide.

A planar waveguide with a glass core and a crystalline cladding. In a specific embodiment, the core is doped preferably with Neodymium, Ytterbium, or Erbium. In the best mode, the core is athermal glass with a refractive index uniformity 10−6 or better and the crystalline cladding has a refractive index lower than that of the core by 10−4 to 10−3 with a refractive index uniformity of 10−4. The cladding has high transparency at pump and lasing wavelengths. The coefficient of thermal expansion of the cladding is close to that of the core. In illustrative embodiments, the cladding is Sapphire and the core is aluminate glass. In an alternative embodiment, the cladding is crystal quartz and the core—is phosphate glass. By utilizing different materials for the core and cladding, the properties of each are optimized. Use of glass for the core allows much more flexibility in tailoring the properties of the core and the PWG geometry readily accommodates the low thermal conductivity of a glass core because the overall thermal performance is dominated by the higher thermal conductivity of the crystalline cladding.