Abstract: An optical device includes a metal reflective layer substantially made of a metal material, a first light transmissive layer disposed on the metal reflective layer, an optical multilayer reflective film disposed on the first light transmissive layer and including a plurality of sublayers stacked on each other and having different refractive indexes, and a wavelength converting layer disposed on the optical multilayer reflective film and containing a fluorescent material capable of absorbing incident excitation light and generating fluorescent light having a lower energy. The wavelength converting layer is capable of generating mixed light containing the excitation light and the fluorescent light in response to irradiation with the excitation light.

Abstract: An optical device includes a metal reflective layer substantially made of a metal material, a first light transmissive layer disposed on the metal reflective layer, an optical multilayer reflective film disposed on the first light transmissive layer and including a plurality of sublayers stacked on each other and having different refractive indexes, and a wavelength converting layer disposed on the optical multilayer reflective film and containing a fluorescent material capable of absorbing incident excitation light and generating fluorescent light having a lower energy. The wavelength converting layer is capable of generating mixed light containing the excitation light and the fluorescent light in response to irradiation with the excitation light.

Abstract: A wavelength conversion device includes: a wavelength conversion element having a phosphor plate that converts the wavelength of incident light upon a light incident surface to generate wavelength-converted light, and emits the wavelength-converted light from a light emission surface; an antenna array constituted of a plurality of optical antennas that are periodically arranged on the light emission surface of the phosphor plate; and a recessed structure including at least one recessed portion provided in the light emission surface of the phosphor plate.

Abstract: A wavelength conversion device includes: a wavelength conversion element having a phosphor plate that converts the wavelength of incident light upon a light incident surface to generate wavelength-converted light, and emits the wavelength-converted light from a light emission surface; an antenna array constituted of a plurality of optical antennas that are periodically arranged on the light emission surface of the phosphor plate; and a recessed structure including at least one recessed portion provided in the light emission surface of the phosphor plate.

Abstract: A headlamp includes a light-emitting section which emits fluorescence upon receiving excitation light from a laser element. Energy intensity distribution of the excitation light, which is received by the light-emitting section, is a top-hat distribution.

Abstract: A light emission body capable of simultaneously improving spot feature and color unevenness of illumination light is provided. A light emission body (6) according to one embodiment of the present invention includes a fluorescent substance layer (61) having a light irradiation surface (61a) irradiated with laser light (L1) and a light emitting surface (61b) emitting the laser light (L1) and fluorescence (L2), a light absorption layer (62) that blocks the laser light (L1) and the fluorescence (L2) emitted from the light emitting surface (61b), and a scattering layer (63) that scatters the laser light (L1) and the fluorescence (L2) which are not blocked by the light absorption layer (62).

Abstract: A wavelength conversion member that includes a single crystal phosphor and has a high yield rate is provided. A light emitting unit (1) is a wavelength conversion member that converts a wavelength of a laser light output from a laser light source and includes a phosphor layer (1a) formed of a single crystal phosphor. A plane orientation of a principal plane (1b), which has an area larger than those of divided planes, of the phosphor layer is {111}, and a plane orientation of some divided planes out of the plurality of divided planes is {1-10}.

Abstract: A wavelength conversion member that includes a single crystal phosphor and has a high yield rate is provided. A light emitting unit (1) is a wavelength conversion member that converts a wavelength of a laser light output from a laser light source and includes a phosphor layer (1a) formed of a single crystal phosphor. A plane orientation of a principal plane (1b), which has an area larger than those of divided planes, of the phosphor layer is {111}, and a plane orientation of some divided planes out of the plurality of divided planes is {1-10}.

Abstract: Efficiency of extracting fluorescent light in a desired direction is improved. A light emitting portion (12) of a light emitting device (10) includes a gap present inside thereof, the gap having a width that is one-tenth or less of the wavelength of laser light. An excitation-light transmitting film (13) that transmits laser light and that reflects fluorescent light is provided on a side where a light reception surface (12a) that receives laser light is present. A fluorescent-light transmitting film (14) that reflects laser light and that transmits fluorescent light is provided on a side where an emission surface (12b) that emits fluorescent light is present.

Abstract: In a light emitting section, a phosphor layer including a first phosphor particle which receives excitation light and emits fluorescence with a first peak wavelength and a phosphor layer including a second phosphor particle which receives the excitation light and emits fluorescence with a second peak wavelength are stacked. In the light emitting section, when an upper surface is a surface from which illumination light is mostly emitted, the illumination light including the fluorescence emitted from the first phosphor particle and the fluorescence emitted from the second phosphor particle, a reflective member to reduce leakage of fluorescence is provided on a side surface of the light emitting section.

Abstract: A light emission body capable of simultaneously improving spot feature and color unevenness of illumination light is provided. A light emission body (6) according to one embodiment of the present invention includes a fluorescent substance layer (61) having a light irradiation surface (61a) irradiated with laser light (L1) and a light emitting surface (61b) emitting the laser light (L1) and fluorescence (L2), a light absorption layer (62) that blocks the laser light (L1) and the fluorescence (L2) emitted from the light emitting surface (61b), and a scattering layer (63) that scatters the laser light (L1) and the fluorescence (L2) which are not blocked by the light absorption layer (62).

Abstract: A headlamp includes a light-emitting section which emits fluorescence upon receiving excitation light from a laser element. Energy intensity distribution of the excitation light, which is received by the light-emitting section, is a top-hat distribution.

Abstract: When a phosphor layer formed of a small-gap phosphor plate is used, color irregularity of illumination light emitted from a light-emitting device is reduced. The light-emitting device (100) which emits laser light (L1) as part of illumination light includes a semiconductor laser (10a to 10c) which emits the laser light (L1), which is visible light, a phosphor layer (1a) formed of a small-gap phosphor plate which emits a fluorescence (L2) upon reception of the laser light (L1) emitted from the semiconductor laser (10a to 10c), and an excitation light distribution control unit (1b) which controls light distribution of the laser light (L1) and guides the laser light (L1) to inside of the phosphor layer (1a). The small-gap phosphor plate is a phosphor plate in which a gap that is present inside has a width equal to or longer than 0 nm and equal to or shorter than one tenths of a wavelength of the laser light (L1).

Abstract: Occurrence of luminance unevenness or color unevenness is efficiently reduced. In a light-emitting part (10), a first phosphor layer (La1) containing a first YAG phosphor (3), and a second phosphor layer (La2) containing a second YAG phosphor (2) are stacked on a substrate (1). A particle size of the first YAG phosphor is smaller than a particle size of the second YAG phosphor. The first phosphor layer is arranged on a side far from the substrate, and excitation light (E1) is incident on the first phosphor layer.

Abstract: A headlamp (1) includes a light-emitting section (4) which emits fluorescence upon receiving excitation light from a laser element (2). Energy intensity distribution of the excitation light, which is received by the light-emitting section (4), is a top-hat distribution.

Abstract: A light-emitting device includes a light-emitting portion that emits fluorescence in response to excitation light incident on a surface of the light-emitting portion, and a reflector that defines a light-emitting region on the surface of the light-emitting portion, the fluorescence being emitted from the light-emitting region. The excitation light has a top-hat energy intensity distribution on the surface of the light-emitting portion.

Abstract: A light-emitting unit according to the present invention includes: a fluorescent section for emitting light upon irradiation with a laser beam; and a wavelength selection filter being provided so as to face the fluorescent section. The wavelength selection filter reflects the laser beam toward the fluorescent section and transmits fluorescence emitted from the fluorescent section.

Abstract: A headlamp 1 includes (i) a laser element 2 for emitting a laser beam, (ii) a light emitting section 4, including a sealing material made from an inorganic material, for emitting fluorescence upon receiving the laser beam emitted from the laser element 2, and (iii) a heat sink 7 for releasing, via a contact surface of the heat sink 7 which contact surface is in contact with the light emitting section 4, heat generated in the light emitting section 4 in response to the laser beam emitted onto the light emitting section 4, the light emitting section 4 existing within a range which is determined on the basis of the contact surface and with which desired heat releasing efficiency is obtained.

Abstract: In a light emitting section, a phosphor layer including a first phosphor particle which receives excitation light and emits fluorescence with a first peak wavelength and a phosphor layer including a second phosphor particle which receives the excitation light and emits fluorescence with a second peak wavelength are stacked. In the light emitting section, when an upper surface is a surface from which illumination light is mostly emitted, the illumination light including the fluorescence emitted from the first phosphor particle and the fluorescence emitted from the second phosphor particle, a reflective member to reduce leakage of fluorescence is provided on a side surface of the light emitting section.

Abstract: A light-emitting device includes a light-emitting portion that emits fluorescence in response to excitation light incident on a surface of the light-emitting portion, and a reflector that defines a light-emitting region on the surface of the light-emitting portion, the fluorescence being emitted from the light-emitting region. The excitation light has a top-hat energy intensity distribution on the surface of the light-emitting portion.