Abstract: An optical filter includes: a dielectric multilayer film 1; a substrate comprising a near-infrared ray absorbing glass and a resin film; and a dielectric multilayer film 2 in this order. The resin film comprises a near-infrared ray absorbing dye and a resin, the near-infrared ray absorbing glass is a fluorophosphate glass containing P, Cu, and F, and the optical filter satisfies all of the spectral characteristics (i-1) to (i-3), (i-5), and (i-13).

Abstract: A glass contains ytterbium and has a transmittance of 30% or less for light having a wavelength of 940 nm in terms of a thickness of 0.4 mm. The glass may have a transmittance of 78% or more for light having a wavelength of 850 nm in terms of a thickness of 0.4 mm.

Abstract: An optical filter includes a glass substrate having a first main surface and a second main surface opposite each other and including phosphoric acid glass, a first antireflective layer disposed directly or indirectly on the first main surface of the glass substrate, and a resin layer, containing dye, disposed as one or more layers directly or indirectly on the second main surface of the glass substrate, wherein the glass substrate includes a predetermined range of amount of oxides, wherein the dye has a maximum absorption wavelength in the resin layer at a wavelength range of 690 to 800 nm, wherein thickness of the resin layer is 10 ?m or less, wherein the optical filter has all spectral characteristics specified in (a-1) to (a-6), and wherein a Haze value of the optical filter is 2% or less.

Abstract: An optical filter includes a glass substrate having a first main surface, a second main surface opposite the first main surface, and an end surface connecting the first and second main surfaces, the glass substrate being a phosphate glass containing an absorbent, and a first antireflection layer disposed directly or indirectly on the first main surface of the glass substrate, wherein the first main surface of the glass substrate is coated with a first inorganic film, and a second inorganic film is provided directly or indirectly on the second main surface of the glass substrate, with the end surface being coated with a third inorganic film, and wherein the first inorganic film is a film that is closest to the glass substrate among films constituting the first antireflection layer, or a film that is different from a film composed of a plurality of films constituting the first antireflection layer.

Abstract: A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a wavelength of 1550 nm; and a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.

Abstract: An optical filter includes: an absorber including an inorganic material including ytterbium; an absorption layer including a dye and a resin, the dye having a maximum absorption wavelength between 350 nm and 1,200 nm; and a dielectric multilayer film. The absorber may have a flat plate shape, and the absorber may have a thickness of 3 mm or less.

Abstract: An optical filter includes: a light-absorbing material X800S having a maximum absorption wavelength in a wavelength region shorter than 800 nm; a light-absorbing material Y850L having a maximum absorption wavelength in a wavelength region longer than 850 nm; and a dielectric multilayer film, in which the optical filter satisfies spectral characteristics (i-1) to (i-5).

Abstract: The present invention pertains to an optical filter including: a light-absorbing material Y900-1000 having a maximum absorption wavelength in a wavelength region of 900 nm to 1,000 nm, and a dielectric multilayer film, in which the optical filter satisfies all of spectral characteristics (i-1) to (i-6), and the optical filter may satisfy spectral characteristic (i-7).

Abstract: A glass for an optical filter, the glass being a phosphate glass including Cu, in which the glass has: an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm; an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm; an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm; an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm; a transmittance of 25% or more at a wavelength of 1550 nm; and a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.

Abstract: Optical filter-type glass contains a P component, a Cu component, and Mo component, is substantially free of F, and includes: in mass % on an oxide basis, 60% to 75% of P2O5; 9% to 16.5% of Al2O3; 4% to 20% of ?R2O, where R2O is one or more components selected from Li2O, Na2O, K2O, Rb2O, and Cs2O, and ?R2O is a total amount of R2O; 0% to 8% of ?R?O, where R?O is one or more components selected from CaO, MgO, BaO, SrO, and ZnO, and ?R?O is a total amount of R?O; more than 7% up to 20% of CuO; and 0.01% to 1.18% of MoO3.

Abstract: A near-infrared cut filter includes a transparent substrate having a first and a second surfaces, opposite to each other; and a dielectric multilayer film disposed on a side of the first surface. The dielectric multilayer film reflects light within a wavelength range of 700-750 nm. A mean regular transmittance T1 within a wavelength range of 700-750 nm measured when light is incident in the normal direction from the side of the second surface is 20% or less. A mean regular transmittance T2 within a wavelength range of 600-680 nm measured when light is incident in the normal direction from the side of the second surface is 65% or more. A mean regular reflectance R1 within a wavelength range of 700-750 nm measured when light is incident at an angle of 5° with respect to the normal direction from the side of the second surface is 80% or less.

Abstract: A near-infrared cut filter glass has: an average transmittance in a wavelength range of 400-550 nm of 50-92%; a transmittance at a wavelength of 700 nm of 40-92%; an average transmittance in a wavelength range of 850-950 nm of 0.0001-70%; and an average transmittance in a wavelength range of 1200-2500 nm of 0.0001-60%.

Abstract: An optical filter includes a glass substrate in which an average-optical-transmittance in a specific-visible-region defined as a wavelength range of 430 nm to 650 nm is 80% or more and an average-optical-transmittance in a specific-infrared-region defined as a wavelength range of 900 nm to 1,000 nm is 25% to 85%, a first-optical-multilayer film in which an average-optical-transmittance in the specific-visible-region is 80% or more and an average-optical-transmittance in the specific-infrared-region is in a range of 45% to 65%, the first-optical-multilayer film having, between the specific-visible region and the specific-infrared-region, a first-blocking-band that blocks light, and a second-optical-multilayer-film in which an average-optical-transmittance in the specific-visible-region is 80% or more and an average-optical-transmittance in the specific-infrared-region is in a range of 45% to 65%, the second-optical-multilayer film having, on a side of wavelengths longer than those in the specific-infrared-regi

Abstract: An ultraviolet transmitting glass containing, in mole percentage based on oxides, 55 to 80% of SiO2, 12 to 27% of B2O3, 4 to 20% of R2O (where R represents an alkali metal selected from a group consisting of Li, Na, and K) in total, 0 to 3.5% of Al2O3, 0 to 5% of R?O (where R? represents an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba) in total, 0 to 5% of ZnO, and 0 to 10% of ZrO2, wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more. The glass with high ultraviolet light transmittance, in particular, high deep ultraviolet light transmittance is provided.

Abstract: An ultraviolet transmitting glass containing, in mole percentage based on oxides, 55 to 80% of SiO2, 12 to 27% of B2O3, 4 to 20% of R2O (where R represents an alkali metal selected from a group consisting of Li, Na, and K) in total, 0 to 3.5% of Al2O3, 0 to 5% of R?O (where R? represents an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba) in total, 0 to 5% of ZnO, and 0 to 10% of ZrO2, wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more. The glass with high ultraviolet light transmittance, in particular, high deep ultraviolet light transmittance is provided.

Abstract: A near-infrared cut filter glass includes: P, Al, R (R represents any one or more of Li, Na, and K), R? (R? represents any one or more of Mg, Ca, Sr, Ba, and Zn), and Cu, and not including F practically, wherein (Cu+ amount/total Cu amount)×100[%] is 0.01 to 7.0%. The filter glass may further include, by mol %, 0 to 10% B2O3. The filter glass may have a fracture toughness value of the near-infrared cut filter glass is 0.3 MPa·m1/2 or more. For the filter glass, a quotient obtained by dividing an absorption constant at a wavelength of 430 nm by an absorption constant at a wavelength of 800 nm, of the near-infrared cut filter glass, may be 0.00001 to 0.19.

Abstract: An ultraviolet light transmitting glass contains, in molar percentage on an oxide basis, 55% or more and 80% or less of SiO2; 12% or more and 27% or less of B2O3; 4% or more and 20% or less of R2O in total, where R represents at least one alkali metal selected from a group consisting of Li, Na, and K; 0% or more and 5% or less of Al2O3; 0% or more and 5% or less of R?O in total, where R? represents at least one alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba; 0% or more and 5% or less of ZnO; and 1.5% or more and 20% or less of ZrO2. The ultraviolet light transmitting glass with a thickness of 0.5 mm has a transmittance of 70% or more at a wavelength of 254 nm.

Abstract: A glass includes, in mass percentage on an oxide basis, 50 to 85% of SiO2, 0 to 10% of B2O3, 1 to 20% of Na2O, and 20% or less of K2O, and Sb2O3 is substantially not contained. A total content (Ni+Cr) is more than 0 ppm by mass and 1.2 ppm by mass or less. A total iron oxide (t-Fe2O3) in terms of Fe2O3, a ratio (Na2O/Al2O3) and a total content (Al2O3+K2O) fall within specific ranges, respectively. The contents of each component satisfy a specific relationship.

Abstract: An ultraviolet transmitting glass containing, in mole percentage based on oxides, 55 to 80% of SiO2, 12 to 27% of B2O3, 4 to 20% of R20 (where R represents an alkali metal selected from a group consisting of Li, Na, and K) in total, 0 to 3.5% of Al2O3, 0 to 5% of R?O (where R? represents an alkaline earth metal selected from a group consisting of Mg, Ca, Sr, and Ba) in total, 0 to 5% of ZnO, and 0 to 10% of ZrO2, wherein transmittance at a wavelength of 254 nm in terms of spectral transmittance at a plate thickness of 0.5 mm is 70% or more. The glass with high ultraviolet light transmittance, in particular, high deep ultraviolet light transmittance is provided.

Abstract: The present invention relates to a method for producing phase-separated glass, sequentially including a melting step of melting a glass, a phase separation step of separating phases in the glass, and a shaping step of shaping the glass, and to the phase-separated glass obtained by the production method.