Nichia

An optical circuit includes a first optical waveguide including a first cladding layer, a second cladding layer, and a first core layer disposed between the first cladding layer and the second cladding layer; a second optical waveguide including a third cladding layer, a fourth cladding layer, and a second core layer disposed between the third cladding layer and the fourth cladding layer; and a third optical waveguide including a fifth cladding layer, a sixth cladding layer, and a third core layer disposed between the fifth cladding layer and the sixth cladding layer.

A light-emitting device includes: a light source configured to emit a laser light; a first optical member configured to split the laser light into first branched laser light and second branched laser light by reflecting the first branched laser light and transmitting the second branched laser light; and a first diffusing fiber including: a first end part on which at least a portion of the first branched laser light reflected by the first optical member is incident, and a second end part on which at least a portion of the second branched laser light is incident.

A light-emitting device includes: a support body including: a substrate, and a plurality of conductive members supported by the substrate, the plurality of conductive members including a first conductive part, wherein: the support body has a first recess in an upper surface of the support body; a first light-emitting element disposed on the support body; an integrated circuit extending in a first direction and a second direction orthogonal to the first direction in a top view, the integrated circuit disposed on the support body such that the integrated circuit and the first light-emitting element are in a row in the first direction; a joining member disposed between the support body and the integrated circuit and joining the support body and the integrated circuit; and a first wire connected to the first conductive part and to the integrated circuit.

A light-emitting device includes: a substrate having a mounting surface; a semiconductor laser element supported by the mounting surface; a first mirror member supported by the mounting surface and having a first reflective surface oriented obliquely upward; a cover that has a facing surface facing the mounting surface of the substrate, has an upper surface positioned on a side opposite to the facing surface, and is positioned above the semiconductor laser element and the first mirror member; and a second mirror member supported by the upper surface of the cover and having a second reflective surface. The first reflective surface reflects a laser beam to change a traveling direction of the laser beam to a direction away from the mounting surface of the substrate. The cover transmits the laser beam reflected by the first reflective surface. The second reflective surface reflects the laser beam reflected by the first reflective surface.

A fluoride phosphor containing: manganese; fluorine; an element M including at least one selected from the group consisting of Group 4 elements, Group 13 elements, and Group 14 elements; and at least one selected from the group consisting of an alkali metal and an ammonium ion. When the total number of moles of the alkali metal and the ammonium ion is 2, the number of moles of the manganese is greater than 0 and less than 0.2, the total number of moles of the element M is greater than 0.8 and less than 1, and the number of moles of the fluorine is greater than 5 and less than 7. The fluoride phosphor has a particle diameter ratio (Da/Dm) that is 0.85 or greater, where Da is a mean particle diameter measured by a FSSS method, and Dm is a volume median diameter measured by a laser diffraction particle size distribution measurement method.

A light-emitting element includes: a first semiconductor portion including a first n-side semiconductor layer, a first active layer disposed on the first n-side semiconductor layer and configured to emit ultraviolet light, and a first p-side semiconductor layer disposed on the first active layer; and a second semiconductor portion including a second n-side semiconductor layer disposed on the first semiconductor portion, a second active layer disposed on the second n-side semiconductor layer and configured to emit ultraviolet light, and a second p-side semiconductor layer disposed on the second active layer. The first p-side semiconductor layer includes a first layer containing Al and a second layer disposed on the first layer and containing Al and a p-type impurity. The second p-side semiconductor layer includes a third layer containing Al and a fourth layer disposed on the third layer and containing Al and a p-type impurity.

An optical system for lighting according to an embodiment includes: a laser light source configured to emit first light having a peak wavelength in a range of 420 nm to 480 nm; a wavelength conversion member including a phosphor layer including two or more types of phosphor particles, part of the first light being incident on the wavelength conversion member, from which second light exits; and a reflective-transmissive member configured to transmit part of the first light and reflect part of the second light as third light, in which a transmittance of the reflective-transmissive member is less than 85% for light having a wavelength of 450 nm, and is 20% or less for light having a wavelength of 550 nm.

A wavelength beam combining device includes: a plurality of laser light sources configured to emit a plurality of laser beams in a first direction and having mutually different peak wavelengths and central axes arranged in a second direction intersecting the first direction; a first diffraction grating disposed at a position where the plurality of laser beams are received, the first diffraction grating being configured to diffract the plurality of laser beams in different directions according to wavelengths of the laser beams to cause the diffracted laser beams to enter the second diffraction grating; a second diffraction grating configured to diffract the plurality of laser beams diffracted by the first diffraction grating to form a wavelength-combined beam, and to direct the wavelength-combined beam in the first direction; and an optical coupling unit configured to couple the wavelength-combined beam to an optical transmission fiber and to be movable in the second direction.

A light-emitting device includes a support including a wall portion; a light-emitting element placed on the support and surrounded by the wall portion in a plan view; a first light-transmissive member having a first outer surface and a second outer surface, which is located above the first outer surface and is located inside the first outer surface in the plan view, and covering the light-emitting element and the wall portion; and a light-shielding member covering the first light-transmissive member. The first outer surface and the second outer surface are exposed from the light-shielding member, and a surface roughness of the first outer surface is rougher than a surface roughness of the second outer surface.

A vehicle light source device (100) includes: a plurality of light sources (1) arranged in two rows and n columns, wherein n is a natural number of 4 or greater, the plurality of light sources (1) including: a plurality of first light sources (1-1) arranged in a row direction in a first row, each of the first light sources (1-1) comprising a first light emitting element (11-1) and a first light transmissive member (12-1) arranged on the first light emitting element (11-1), and a plurality of second light sources (1-2) arranged in the row direction in a second row, each of the second light sources (1-2) comprising a second light emitting element (11-2) and a second light transmissive member (12-2) arranged on the second light emitting element (11-2).