Abstract: A method includes producing filamentary damages in a volume of a glass or glass ceramic element that are adjacently aligned along a separation line and that extend obliquely relative to a surface of the glass or glass ceramic element, and separating a portion from the glass or glass ceramic element along the separation line. The step of producing the filamentary damages includes directing laser pulses of an ultrashort pulse laser obliquely on the surface so that the laser pulses have a light propagation direction that extends obliquely relative to the surface and so that the filamentary damages resulting from the laser pulses have the longitudinal extension that extends obliquely relative to the surface, generating a plasma within the volume with the laser pulses, and displacing the laser pulses at points of incidence over the surface along the separation line.

Abstract: An illumination device includes: a light source configured for emitting a primary light; a light conversion unit formed by or including a light conversion element including a front side and a back side, the light conversion element being configured for being illuminated with the primary light and for emitting a secondary light with a wavelength altered relative to the primary light, the light conversion element being configured, on illumination with the primary light, for emitting the secondary light which is characterized by a spectrum which defines a point in a CIE 1931 color space at least one of that: (i) together with a blue point and a red point of an REC709 window defines an area which covers at least 95% of the REC709 window; and (ii) has a radial distance from a green point of the REC709 window that is at most 0.02.

Abstract: A lighting device includes: a light source configured for emitting a primary light; a light conversion unit formed by or including: a light conversion element including a front side and a rear side, wherein the light conversion element is configured for being illuminated by the primary light on the front side and for emitting a secondary light with an altered wavelength compared to the primary light on the front side, wherein the light conversion element includes a first phase including a light-converting ceramic material and a second phase including a further ceramic material, the second phase having a higher thermal conductivity than the first phase, and wherein the light conversion element includes a plurality of pores.

Abstract: A lighting device includes: a light conversion unit including a light conversion element including a material containing an optically active element from lanthanoids, wherein: the light conversion element includes a front side, a rear side, and a thickness (t), the light conversion element is set up for an irradiation on the front side with a primary light (I0), for a diffuse reflectance of the primary light (IREM), for a specular reflection of the primary light (IFRE), and for a diffuse emission of a secondary light (IEM) with an altered wavelength compared to the primary light, and the light conversion unit has a specific diffuse reflectance SDR=t?1·IREM/(I0?IFRE), such that a luminous flux emitted by the light conversion unit at an irradiance limit of the light conversion unit with regard to a variation in the proportion of the optically active element is at most 4 mm?1 away from a maximum.

Abstract: A method is provided that includes producing filamentary damages in a volume of a glass or glass ceramic element adjacently aligned along a separation line and extend obliquely relative to a surface of the glass or glass ceramic element; and separating a portion from the glass or glass ceramic element along the separation line. The step of producing the filamentary damages includes directing laser pulses of an ultrashort pulse laser obliquely on the surface so that the laser pulses have a light propagation direction that extends obliquely relative to the surface and so that the filamentary damages resulting from the laser pulses have the longitudinal extension that extends obliquely relative to the surface; generating a plasma within the volume with the laser pulses; and displacing the laser pulses at points of incidence over the surface along the separation line.

Abstract: A light source is provided that includes a laser operable to emit laser light at a wavelength in a range from 460 nanometers to 470 nanometers and a converter assembly arranged so as to absorb the laser light emitted by the laser and to emit photoluminescent light produced by the laser light and having a longer wavelength than the laser light. The converter assembly has a converter element with a ceramic doped with Eu3+ such that under irradiation of the laser light the converter assembly emits photoluminescent light in the red spectral range.

Abstract: A method for separating a portion from a sheet glass element having a thickness of at least 2 millimeters along an intended separation line that divides the sheet glass element into the portion and a remaining main part is provided. The method includes producing filamentary damages comprising sub-micrometer hollow channels in a volume of the glass sheet element adjacently aligned along the separation line; and heating and/or cooling the glass sheet element to cause expansion and/or contraction so that the portion detaches from the main part along the separation line. The portion and the remaining main part each remain intact as a whole. The step of producing the filamentary damages includes generating a plasma within the volume with laser pulses of an ultrashort pulse laser; and displacing points of incidence of the laser pulses over a surface of the glass sheet element along the separation line.

Abstract: A method for separating a substrate of a brittle-hard material is provided. The method includes the steps of introducing defects into the substrate at a spacing from one another along a separation line using at least one pulsed laser beam; selecting an average spacing between neighboring defects and a number of laser pulses for generating a respective defect such that a breaking stress (?B) for separating the substrate along the separation line is smaller than a first reference stress (?R1) of the substrate and such that an edge strength ?K of the separation edge obtained after separation is greater than a second reference stress (?R2) of the substrate; and separating the substrate after introducing the defects by applying a stress along the separation line.

Abstract: A method for separating a portion from a sheet glass element having a thickness of at least 2 millimeters along an intended separation line that divides the sheet glass element into the portion and a remaining main part is provided. The method includes producing filamentary damages comprising sub-micrometer hollow channels in a volume of the glass sheet element adjacently aligned along the separation line; and heating and/or cooling the glass sheet element to cause expansion and/or contraction so that the portion detaches from the main part along the separation line. The portion and the remaining main part each remain intact as a whole. The step of producing the filamentary damages includes generating a plasma within the volume with laser pulses of an ultrashort pulse laser; and displacing points of incidence of the laser pulses over a surface of the glass sheet element along the separation line.

Abstract: A method for separating a substrate of a brittle-hard material is provided. The method includes the steps of introducing defects into the substrate at a spacing from one another along a separation line using at least one pulsed laser beam; selecting an average spacing between neighboring defects and a number of laser pulses for generating a respective defect such that a breaking stress (?B) for separating the substrate along the separation line is smaller than a first reference stress (?R1) of the substrate and such that an edge strength ?K of the separation edge obtained after separation is greater than a second reference stress (?R2) of the substrate; and separating the substrate after introducing the defects by applying a stress along the separation line.

Abstract: A method for the production of glass or glass ceramic elements from flat glass or glass ceramic parts is provided where the edges of the glass or glass ceramic elements are treated by a combination of two processes. The flat glass or glass ceramic element with an edge surface connecting the two side surfaces is produced. The edge surface has at least one first elongated, strip-shaped edge region and at least one second elongated strip-shaped edge region, which are formed by a ground edge. The edge regions extend in the longitudinal direction along the edge surface and along the side surfaces. The first edge region has elongated parallel filamentary damages that are parallel and adjacent to one another and, in particular, spaced apart equidistantly, in the longitudinal direction thereof extending transversely to the side surfaces and along the surface of the first edge region.

Abstract: An optical converter is provided that has both a stable colour even at highest luminous powers and a high luminous efficiency. The optical converter includes a ceramic element that is fluorescent so that light of a first wavelength is absorbed in the ceramic element and fluorescent having longer wavelength light is emitted. The ceramic element includes pores spatially irregularly distributed within the ceramic element. The distribution of the pores within the ceramic element is inhomogeneous so that the radial distribution function of the pore locations deviates from unity and has a maximum at a characteristic distance, the maximum having a value of at least 1.2.

Abstract: A method for filamentation of a dielectric workpiece has a workpiece with a thickness between 0.5 and 20 mm is provided. The workpiece has boundary surfaces delimiting the workpiece. The thickness of the workpiece varies spatially and/or at least one of the boundary surfaces delimiting the workpiece has at least one curvature with a radius of curvature between 0.1 ?m and 10 m. The dielectric workpiece can have a specially formed edge.

Abstract: An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTEKS of 4 to 18×10?6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

Abstract: A method is provided that includes producing filamentary damages in a volume of a glass or glass ceramic element adjacently aligned along a separation line and extend obliquely relative to a surface of the glass or glass ceramic element; and separating a portion from the glass or glass ceramic element along the separation line. The step of producing the filamentary damages includes directing laser pulses of an ultrashort pulse laser obliquely on the surface so that the laser pulses have a light propagation direction that extends obliquely relative to the surface and so that the filamentary damages resulting from the laser pulses have the longitudinal extension that extends obliquely relative to the surface; generating a plasma within the volume with the laser pulses; and displacing the laser pulses at points of incidence over the surface along the separation line.

Abstract: A method for filamentation of a dielectric workpiece has a workpiece with a thickness between 0.5 and 20 mm is provided. The workpiece has boundary surfaces delimiting the workpiece. The thickness of the workpiece varies spatially and/or at least one of the boundary surfaces delimiting the workpiece has at least one curvature with a radius of curvature between 0.1 ?m and 10 m. The dielectric workpiece can have a specially formed edge.

Abstract: A lighting device includes: at least one laser light source configured to emit a light beam; and a light conversion element associated with the at least one laser light source and arranged in the beam path of at least one light beam generated by at least one laser light source such that at least a portion of the light beam emitted by the at least one laser light source is directed onto the light conversion element, and in such a way that a laser light spot is illuminated on a face of the light conversion element facing the incident light beam, the light conversion element comprising a material which, through scattering, absorption and conversion of the incident laser light, emits and scatters light of a larger wavelength.

Abstract: An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTEKS of 4 to 18×10?6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

Abstract: A light source is provided that includes a laser operable to emit laser light at a wavelength in a range from 460 nanometers to 470 nanometers and a converter assembly arranged so as to absorb the laser light emitted by the laser and to emit photoluminescent light produced by the laser light and having a longer wavelength than the laser light. The converter assembly has a converter element with a ceramic doped with Eu3+ such that under irradiation of the laser light the converter assembly emits photoluminescent light in the red spectral range.

Abstract: A method for the production of glass or glass ceramic elements from flat glass or glass ceramic parts is provided where the edges of the glass or glass ceramic elements are treated by a combination of two processes. The flat glass or glass ceramic element with an edge surface connecting the two side surfaces is produced. The edge surface has at least one first elongated, strip-shaped edge region and at least one second elongated strip-shaped edge region, which are formed by a ground edge. The edge regions extend in the longitudinal direction along the edge surface and along the side surfaces. The first edge region has elongated parallel filamentary damages that are parallel and adjacent to one another and, in particular, spaced apart equidistantly, in the longitudinal direction thereof extending transversely to the side surfaces and along the surface of the first edge region.