Abstract: The present invention relates to the field of security inks suitable for printing machine readable security features on substrate, security documents or articles as well as machine readable security feature made from said security inks, and security documents comprising a machine readable security feature made from said security inks. In particular, the invention provides security inks comprising one or more IR absorbing materials selected from the group consisting of crystal water-free iron(II) orthophosphates of the general formula Fe3(PO4)2 and having a graftonite crystal structure, crystal water-free iron(II) metal orthophosphates, crystal water-free iron(II) metal phosphonates, crystal water-free iron(II) metal pyrophosphates, crystal water-free iron(II) metal metaphosphates of the general formula FeaMetb(POc)d, wherein said security ink is an oxidative drying security ink, a UV-Vis curable security ink, a UV-Vis curable security ink or a combination thereof.

Abstract: An optical glass contains: a P2O5 component of 30 to 60 mass % (exclusive of 30); an Al2O3 component of 2 to 10 mass % (exclusive of 2); a TiO2 component of 10 to 36 mass % (exclusive of 36); an Nb2O5 component of 0 to 5 mass %; a Ta2O5 component of 0 to 15 mass %; a Bi2O3 component of 0 to 5 mass % (exclusive of 5); and an Sb2O3 component of 0 to 1 mass %; and a BaO component of 1 to 20 mass %.

Abstract: Provided is a near-infrared cut-off filter having excellent oblique incidence characteristics due to extremely low dependence on the angle of incidence, and a low transmittance in a wavelength region of 1000 nm or more. More particularly, the near-infrared cut-off filter includes a transparent substrate that is formed of glass containing iron atoms and has a half-value wavelength of greater than 630 nm on a long wavelength side of a transmittance curve and an average transmittance of 1% or less in a wavelength region of 1000 to 1200 nm; and a resin layer formed on at least one main surface of the transparent substrate to absorb light of a specific wavelength.

Abstract: A coating composition includes phosphorus pentoxide (P2O5), aluminum oxide (Al2O3), boron trioxide (B2O3), zinc oxide (ZnO), I group-based metal oxide, and II group-based metal oxide. The coating composition includes by weight based on a total weight of the coating composition 35 to 55% P2O5, 5 to 35% Al2O3, 5 to 40% I group-based metal oxide, 5 to 10% B2O3, 1 to 5% ZnO, and 1 to 10% II group-based metal oxide.

Abstract: The present invention general related to a reusable mold and a method of using the mold to manufacture contact lenses. The mold comprises a first mold half having a first mold surface in contact with a lens forming composition and a second mold half having a second mold surface in contact with the lens forming composition, wherein the first mold half and the second mold half are configured to receive each other such that a cavity is formed between the first mold surface and the second mold surface, wherein the cavity defines the shape of a contact lens to be molded, wherein the lens forming composition is polymerizable and/or crosslinkable by an actinic radiation, wherein at least one of the mold halves is a precision press molded mold made from an oxide glass selected from a group consisting of borosilicates glass and fluorophosphates glass.

Abstract: To provide a near infrared cutoff filter glass which is excellent in optical properties such that the transmittance of visible light is high, and the transmittance of near infrared light is low. A near infrared cutoff filter glass comprising components of P, F, Al, R (R is at least one member selected from Li, Na and K), R? (R? is at least one member selected from Mg, Ca, Sr, Ba and Zn) and Cu, wherein (Cu+/the total amount of Cu)×100[%] is within a range of from 0.01 to 4.0%.

Abstract: To provide a fluorophosphates glass having a weather-resistant property and having an O2?/P5+ ratio even after production, which is set so that Cu2+ can be added with a quantity of such a degree suppressing an absorption of a visible light while absorbing a near-infrared light, and a method for producing the same, and a near-infrared light absorbing filter, wherein a molar ratio of a content of O2? with respect to a content of P5+ (O2?/P5+) in the fluorophosphates glass, is 3.2 or more and less than 3.4, and a molar ratio of a content of F? with respect to a total content of O2? and F? (F?/(O2?+F?)) in the fluorophosphates glass is 0.05 or more and 0.25 or less.

Abstract: Provided is an optical glass having low specific gravity, low abrasion degree, and high devitrification-proof stability, as well as a preform for precision press molding and an optical element which use such an optical glass. The optical glass has a composition including, in cationic % expression, P5+: 36 to 40%, Al3+: 11 to 16%, Mg2+: 11 to 19%, Ca2+: greater than 0% and 2% or less, Sr2+: 0 to 4%, Ba2+: 25 to 31%, Zn2+: 0% or more and less than 2.4%, and Y3+: 2 to 7%, a total amount of Zn2+ and Y3+ (Zn2++Y3+) being 3 to 7%. The composition also includes, in anionic % expression, O2?: 74 to 78%, and F?: 22 to 26%. Li+, Na+, K+, La3+, and Gd3+ are not included. The optical glass further has a refractive index (nd) of 1.58 to 1.60 and an Abbe number (?d) of 67 to 69.

Abstract: The present application provides a glass composition comprising 10-50% by weight CaO, at least 15% and less than 50% by weight P2O5, less than 3% by weight Al2O3, less than 10% by weight Li2O, Na2O, and K2O combined, and 0-60% by weight of SrO, MgO, BaO, ZnO, or combinations thereof; dental compositions comprising the glass composition, and methods of making and using such dental compositions.

Abstract: The invention relates to glasses for use in solid laser applications, particularly short-pulsed, high peak power laser applications. In particular, the invention relates to a method for broadening the emission bandwidth of rare earth ions used as lasing ions in solid laser glass mediums, especially phosphate-based glass compositions, using Nd and Yb as co-dopants. The invention further relates to a laser system using a Nd-doped and Yb-doped phosphate laser glass, and a method of generating a laser beam pulse using such a laser system.

Abstract: The present invention relates to an optical element comprising: a optical glass made of a phosphate glass or a fluorophosphate glass; and an optically functional film formed on a surface of the optical glass, wherein the optically functional film comprises two or more layers made of different materials, and the outermost surface layer thereof is made of a material(s) having low reactivity with phosphoric acid.

Abstract: The present invention provides a process for producing a near infrared cut filter glass by melting and forming a glass material blended; and from 0.1 to 5% as represented by mass percentage of an oxidant of at least of a nitrate compound, a sulfate compound, a peroxide, a perchlorate and chloric acid as well as a near infrared cut filter glass.

Abstract: The present invention provides a fluorophosphate glass containing more than 3 cationic % and 30 cationic % or less of a phosphorus ingredient in terms of P5+, the glass having a ratio I(1)/I(0) of equal to or less than 0.08 in which I(0) is a strength of a resonance peak generated near a reference frequency of 31P in a nuclear magnetic resonance spectrum and I(1) is a strength of a first-order side band peak of the resonance peak. The glass of the invention is reduced in volatility and erosiveness.

Abstract: The present invention provides a fluorophosphate glass containing 30 to 50 cationic % of a phosphorus ingredient in terms of P5+, the glass having, in a nuclear magnetic resonance spectrum, a resonance spectrum which is generated near a reference frequency of 31P and has a shape of Gaussian function. The glass of the invention is reduced in volatility and erosiveness.

Abstract: The present invention provide a fluorophosphate glass comprising 3 to 25 cation % of P5+, more than 30 cation % and 40 cation % or less of Al3+, 0.5 to 20 cation % of Li+ and 65 anion % or more of F? as glass ingredients, and having a liquid phase temperature of 700° C. or less. The fluorophosphate glass of the present invention has ultra low dispersibility and stability, and is preferably used for glass materials for press molding, optical element blanks and optical elements.

Abstract: An infrared absorbing filter includes a glass plate molded by melting a composition of raw materials and cooling the melted composition. The composition of raw materials includes 28-33 by percentage weight (wt %) of phosphorus pentoxide (P2O5), 14-33 wt % of A oxide (A2O), 0.15-4 wt % of B oxide (BO), 2.5-8 wt % of copper oxide (CuO), 1.4-1.65 wt % of aluminum oxide (Al2O3). Wherein A is one of alkali metals, A2O is one of oxidizing alkali metals, B is one of alkaline earth metals, BO is one of oxidizing alkaline earth metals.

Abstract: Disclosed are the use of phosphate-based glasses as a solid state laser gain medium, in particular, the invention relates to broadening the emission bandwidth of rare earth ions used as lasing ions in a phosphate-based glass composition, where the broadening of the emission bandwidth is believed to be achieved by the hybridization of the glass network.

Abstract: The present invention provides an optical glass, containing, in % by weight on an oxide basis, 30 to 50% of P2O5, 18 to 43% of BaO, 2 to 12% of B2O3, 1.4 to 5% of Al2O3, more than 0 to 6% of Li2O, more than 0 to 9% of La2O3, 0.1 to 8% of MgO, 0 to 10% of CaO, 0 to 15% of SrO, 0 to 5% of ZnO, 0 to 7% of Gd2O3, and 0 to 3% of SiO2, and having optical constants of a refractive index nd of 1.59 to 1.63 and an Abbe number ?d of 63 to 68.

Abstract: Disclosed is a glass material for press forming providing an optical element having a sufficient optical performance without surface cracks, cloudiness, scratches, and the like even when the glass material contains a highly reactive component. Also disclosed are an optical element having a sufficient optical performance without surface cracks, cloudiness, scratches, and the like and a method for manufacturing the same. Specifically disclosed is a glass material for press forming which comprises a core portion composed of multicomponent optical glass and a surface glass layer covering at least a region serving as an optical functional surface of the core portion. The surface glass layer contains more than 90 mass % of SiO2, and the thickness of the layer is less than five nanometers. Also specifically disclosed is a method for manufacturing a glass optical element by heating the glass material and by press forming the softened glass material using a forming die.

Abstract: The invention relates to aluminophosphate-based glasses suitable for use as a solid laser medium, which further contains SiO2 and B2O3. The laser glasses possess desirable figure of merit values for FOMTM and FOMlaser, as described herein.

Abstract: A P2O5—BaO—ZnO—Nb2O5 type optical glass contains 25-50 wt. % P2O5, 15-35 wt. % BaO, 1-25 wt. ZnO, and 3-10 wt. % Nb2O5. The optical glass has a high refractive index (particularly preferably the refractive index nd of 1.6 or more), low dispersion (an Abbe number ?d of 42 or more), a low deformation point, and improved resistance to devitrification upon molding, and is suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure.

Abstract: A glass composition having high refractive index, softening property at low temperature and small average thermal expansion coefficient, and a member provided with the composition on a substrate, are provided. The glass composition of the present invention has a refractive index (nd) of from 1.88 to 2.20, a glass transition temperature (Tg) of from 450 to 490° C., and an average thermal expansion coefficient at temperatures from 50° C. to 300° C. (?50-300) of from 60×10?7/K to 90×10?7/K, and includes Bi2O3 in an amount of from 5 to 25% in terms of mol % on the basis of oxides.

Abstract: An optical glass has a composition including: 40 to 65 mass % of P2O5, and 0 to less than 5 mass % of Li2O+Na2O+K2O. In the optical glass, (MgO+CaO)/(Li2O+Na2O+K2O) which is a ratio of the total content expressed in mass % of MgO and CaO to the total content expressed in mass % of Li2O, Na2O, and K2O, is in a range from 6 to 38.

Abstract: Optical components that maintain transparency (remain clear) in high energy environments, including in applications of high-intensity gamma-ray radiation dosage of 1.29×109 rads and greater, and neutron energy at neutron fluxes ranging from 3×109 to 1×1014 n/cm2 sec and greater, and fluencies ranging from 2×1016 to 8.3×1020 n/cm2 and greater. Further, the optical components have a bulk laser damage threshold of 105+/?20 J/cm2, a surface laser damage threshold of 72+/?15 J/cm2, a Stokes shift of about 9%, and a fractional thermal loading of about 11%.

Abstract: The invention relates to a new class of luminescent substances (phosphorous) based on an universally dopable matrix made of an amorphous, at the most partially crystalline network of the elements P, Si, B, Al and N, preferably the composition Si3B3N7. Optical excitation and emission can be varied in this system over the entire practically relevant field by incorporation of any cationic activators, alone or in combination, but also by incorporation of oxygen as anionic component. This opens up the entire spectrum of use of luminescent substances, such as illumination systems or electronic screens.

Abstract: Optical components that maintain transparency (remain clear) in high energy environments, including in applications of high-intensity gamma-ray radiation dosage of 1.29×109 rads and greater, and neutron energy at neutron fluxes ranging from 3×109 to 1×1014 n/cm2 sec and greater, and fluencies ranging from 2×1016 to 8.3×1020 n/cm2 and greater. Further, the optical components have a bulk laser damage threshold of 105+/?20 J/cm2, a surface laser damage threshold of 72+/?15 J/cm2, a Stokes shift of about 9%, and a fractional thermal loading of about 11%.

Abstract: An optical glass includes, by mass: 38 to 55% of P2O5; 1 to 10% of Al2O3; 0 to 5.5% of B2O3; 0 to 4% of SiO2; 3 to 24.5% of BaO; 0 to 15% of SrO; 1 to 10% of CaO; 0.5 to 14.5% of ZnO; 1 to 15% of Na2O; 1 to 4% of Li2O; 0 to 4.5% of K2O; 0 to 0.4% of TiO2; and 0 to 5% of Ta2O5, in which BaO+SrO+CaO+ZnO falls within a range of 25 to 39%, Na2O+Li2O+K2O falls within a range of 5 to 20%, Al2O3+SiO2+CaO+Ta2O5 falls within a range of 9 to 18% and P2O5+B2O3+Al2O3+SiO2+BaO+SrO+CaO+ZnO+Na2O+Li2O+K2O+TiO2+Ta2O5 is equal to 98% or more.

Abstract: A glass composition including, in oxide-based mol %: (a) at least 30% and at most 50% P2O5, (b) at least 25% and at most 65% ZnO, (c) at least 0.1% and at most 10% Al2O3, (d) at least 0% and at most 50% Li2O, (e) at least 0% and at most 50% Na2O, (f) at least 0% and at most 50% K2O, (g) at least 0% and at most 20% MgO, (h) at least 0% and at most 20% CaO, (i) at least 0% and at most 20% SrO, (j) at least 0% and at most 20% BaO, (k) at least 0% and at most 20% SnO, and (l) at least 0% and at most 5% B2O3, at least one of (d) Li2O, (e) Na2O and (f) K2O being more than 0%, and (a)/(b), the ratio of (a) and (b), being at least 0.2 and at most 2.0.

Abstract: Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.

Abstract: The present invention provides a composition. The composition comprises zinc and bismuth. The composition is for use in the protection of glassware in an automatic dishwashing process from detrimental effects caused by exposure to aluminum.

Abstract: A cover glass, containing, by mole percentage: 15 to 40% of P2O5; 15 to 30% of Al2O3; 0 to 15% of SiO2; 0 to 20% of B2O3; 0 to 10% of Li2O; 0 to less than 20% of Na2O; 0 to less than 20% of K2O, provided that Li2O+Na2O+K2O is in a range from 15 to less than 20%; and from 1 to 35% of MgO+CaO+SrO+ZnO. The cover glass being suitable for at least one selected from the group consisting of a solid-state imaging element package and an air-tight sealing of a resin package, and having a sufficient strength not to undergo breakage even when subjected to external force.

Abstract: The lead- and arsenic-free optical glass has a refractive index nd of 1.55?nd?1.64, an Abbe number ?d of 42??d?65, and a low transition temperature Tg?460° C., good producibility and processability, and crystallization stability. The optical glass has a composition within the following range, in wt. % based on oxide content: P2O5 40-58 ZnO 20-34 Li2O 0.5-5?? GeO2 0.1-11. The glass may also have a total content of SiO2, B2O3 and Al2O3 that is less than 9 wt. %. The glass may contain MgO, SrO, CaO and BaO, but the sum of these oxides is preferably at least 2 wt. % and at most 12 wt. %. The glass may contain at most 5 wt. % of each of La2O3, TiO2, Nb2O5, at most 2 wt. % Ta2O5 and less than 1 wt. % fluorine.

Abstract: Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.

Abstract: The invention relates to aluminophosphate-based glasses suitable for use as a solid laser medium, which further contains SiO2 and B2O3. The laser glasses possess desirable figure of merit values for FOMTM and FOMlaser, as described herein.

Abstract: The lead-free and fluorine-free optical glass has a refractive index of 1.60?nd?1.64 and an Abbe number of from 56?vd?64, a transformation temperature less than or equal to 590° C., can be precise pressed and is stable to cystallization. The glass has the following, composition (in weight-% based on oxide content. P2O5, 26-35; B2O3, 10-15; Al2O3, 5.5-10; BaO, 25-37; SrO, 0-6; CaO, 8-15; ZnO, 3-10; Bi2O3, 0-8; Na2O, 0-2; K2O, 0-2; WO3, 0-10; La2O3, 0-2; Nb2O5, 0-1; TiO2,0-<1; ? alkaline earth metal oxides ?40; ? alkali metal oxides, 0-2 and at least one fining agent, 0-0.5.

Abstract: To provide a cover glass for a solid-state imaging element package, which is useful for air-tight sealing of a resin package and which has a strength not to undergo breakage even when subjected to external force. A cover glass for a solid-state imaging element package, which comprises, by mole percentage, P2O5: 15 to 40%, Al2O3: 15 to 30%, SiO2: 0 to 15%, B2O3: 0 to 20%, Li2O: 0 to 15%, Na2O: 0 to 25%, K2O: 0 to 25%, provided that Li2O+Na2O+K2O: 15 to 40%, and MgO+CaO+SrO+ZnO: 1 to 35%.

Abstract: Disclosed are the use of phosphate-based glasses as a solid state laser gain medium, in particular, the invention relates to broadening the emission bandwidth of rare earth ions used as lasing ions in a phosphate-based glass composition, where the broadening of the emission bandwidth is believed to be achieved by the hybridization of the glass network.

Abstract: The present invention provides a composition. The composition comprises zinc and bismuth. The composition is for use in the protection of glassware in an automatic dishwashing process.

Abstract: The invention relates to an antimicrobial phosphate glass having the following composition in percent by weight on an oxide basis: P2O5>66-80 percent by weight; SO30-40 percent by weight; B203 0-1 percent by weight; Al2O3>6.2-10 percent by weight; SiO2 0-10 percent by weight; Na2O>9-20 percent by weight; CaO 0-25 percent by weight; MgO 0-15 percent by weight; SrO 0-15 percent by weight; BaO 0-15 percent by weight; ZnO>0-25 percent by weight; Ag2O 0-5 percent by weight; CuO 0-10 percent by weight; GeO2 0-10 percent by weight; TeO2 0-15 percent by weight; Cr2O3 0-10 percent by weight; J 0-10 percent by weight; F 0-3 percent by weight.

Abstract: Methods of melt spinning to make amorphous and ceramic materials.

Abstract: The present invention relates to the use of lead-free and phosphate-containing glasses, preferably colored and filter glasses which absorb light in the infrared region (IR-region), in a precision molding process. Preferably, the content of fluorine in the glass is low. Advantageously, so optical constituents can be produced without finishing, such as for example lenses for digital cameras. By the use according to the present invention, also other optical constituents can be produced which can be directly used for a corresponding technical purpose. For an advantageous use, the optical constituents produced by precision molding can be used in the fields imaging, projection, telecommunications, optical communications engineering and laser technology.

Abstract: An optical glass includes, based on the total weight of the optical glass: not less than 35 weight percent and less than 45 weight percent of P2O5; not less than 0.5 weight percent and less than 10 weight percent of B2O3; 0 to 16 weight percent of Al2O3; 0 to 2.5 weight percent of SiO2; 0 to 26 weight percent of BaO; 0 to 20 weight percent of SrO; 23 to 49 weight percent of ZnO; more than 6 weight percent and not more than 20 weight percent of CaO; 0 to 16 weight percent of MgO; not less than 0 weight percent and less than 1 weight percent of Li2O; 3 to 19 weight percent of Na2O; and 0 to 20 weight percent of K2O, where the total weight of BaO, SrO, ZnO, CaO, and MgO and the total weight of Li2O, Na2O and K2O are predetermined amounts.

Abstract: Disclosed is a low melting point glass which has excellent water resistance and can impart excellent flame retardancy to a resin composition. Also disclosed is a resin composition comprising the low melting point glass. Further disclosed is a resin molded article. Specifically disclosed is a low melting point glass which comprises 22-27 mol % of P2O3, 3-18 mol % of SO3, 25-40 mol % of ZnO, 0-2 mol % of Al2O3, 0-4 mol % of Li2O, 0-15 mol % of Na2O and 11-35 mol % of K2O, wherein the total amount of Li2O, Na2O and K2O is 25-35 mol %. The low melting point glass has a glass transition temperature of 200 to 300° C. exclusive. A resin composition is produced by mixing the low melting point glass with a resin. A resin molded article is produced by molding or curing the resin composition.

Abstract: Provided is an optical glasses that has high refractivity and low dispersion and anomalous partial dispersion capability and that has excellent processability and devitrification resistance and ensures that the occurrence of striae can be inhibited, the optical glass including an optical glass having a refractive index (nd) of 1.54 to 1.60, an Abbe's number (vd) of 65 to 78, a partial dispersion ratio of 0.530 or more, a specific gravity of 4.0 or less and a viscosity, measured at its liquidus temperature, of 4 dPa·s or more and an optical glass comprising as cationic components, by cationic %, 20 to 50% of p5+, 0.1 to 20% of Al3+, 0.1 to 20% of Mg2+, 0 to 20% of Ca2+, 0 to 20% of Sr2+, 0.1 to 30% of Ba2+ and 0 to 10% of Y3+, and further comprising, as anionic components, F? and O2?, wherein the ratio of the content of Mg2+ to the content of Al3+, Mg2+/Al3+, based on cationic %, is 1.2 or less.

Abstract: New and improved compositions of doped fluorophosphate glasses for lasers have a high refractive index (nD) of approximately 1.6 to 1.7, high transmission in the near infrared part of the spectrum and a wide glass forming domain. These glass systems, Ba(PO3)2—Al(PO3)3—BaF2-Dopants, utilize dopants from the group of: oxides or fluorides of the rare earth elements: Sm, Eu, Nd, Er, Yb, Tm, Tb, Ho and Pr: as well as MnO; and mixtures thereof. The composition of glass includes chemical durability, efficiency of laser use in the infrared spectrum and improved duration of luminescence. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: An object is to provide a readily fusible glass fiber composition that can alleviate environmental problem and reduce raw material cost by decreasing boron content, and that can facilitate the manufacturing of fine-count glass filament. A glass fiber composition of the present invention is an oxide glass composition, and has compositions of 0.01 to 3% of P2O5, 52 to 62% of SiO2, 10 to 16% of Al2O3, 0 to 8% of B2O3, 0 to 5% of MgO, 16 to 30% of CaO, and 0 to 2% of R2O(R?Li+N+K), which are in terms of oxide represented in mass percentage.

Abstract: Water-soluble glass as corrosion protector in dishwashing machines A zinc-containing, water-soluble glass composition comprising from 41 to 54 mole % of P2O5, 10 to 30 mole % of alkali oxides, up to 5 mole % of SO3 and up to 25 mole % of ZnO.

Abstract: There is provided a glass ceramic material for plasma display, in which glass fine grains (A) having a softening point of 570-640° C. are in 40-70 wt %, and glass fine grains (B) having a softening point of 480-540° C. are in 30-60 wt %, the glass ceramic material for plasma display being characterized in that the glass fine grains (A) comprise 2-12 wt % of SiO2, 50-58 wt % of B2O3, 10-20 wt % of Al2O3, 0-6 wt % of ZnO, 0-2.8 wt % of Li2O, and 10-22 wt % of at least one selected from MgO, CaO, SrO and BaO and that refractive index of the glass fine grains (A) is 1.53-1.56.

Abstract: A P2O5—BaO—ZnO—Nb2O5 type optical glass contains 25-50 wt. % P2O5, 15-35 wt. % BaO, 1-25 wt. ZnO, and 3-10 wt. % Nb2O5. The optical glass has a high refractive index (particularly preferably the refractive index nd of 1.6 or more), low dispersion (an Abbe number ?d of 42 or more), a low deformation point, and improved resistance to devitrification upon molding, and is suitable for precision-mold press molding or other molding processes and also suitable for transfer of a fine structure.

Abstract: An optical glass having a refractive index (nd) within a range from 141 to 1.47 and an Abbe number (?d) within a range from 90 to 100 comprises in mass % on element basis: P ?0.1-5.0% Al ?1.0-20.0% F 30.0-60.0% and O ?1.0-20.0% and comprises, as an essential component, one or more elements selected from the group consisting of Ca, Sr and Ba. In this optical glass, the ratio (Si+B+P+Al)/F is within a range from 0.15 to 0.40.