Abstract: A semiconductor laser device is controlled by a controller and includes a plurality of optical amplifiers that each emit a light beam, a diffraction grating that receives the light beam from each of the plurality of optical amplifiers, and a rotary mirror that is rotatable and is disposed in an optical path between the plurality of optical amplifiers and the diffraction grating. The controller rotates the rotary mirror in accordance with a current applied to the plurality of optical amplifiers, and an angle of incidence of the light beam on the diffraction grating changes in accordance with the current applied.

Abstract: A semiconductor laser device includes: a semiconductor laser element including an emitter that emits emission light; a lens that transmits the emission light emitted from the emitter; a driver that supports the lens in a state in which a position and an orientation of the lens are changeable; a detector that detects an intensity distribution of the emission light emitted from the emitter and transmitted through the lens; and a controller that, based on a detection result of the detector, controls at least one of the position or the orientation of the lens by driving the driver to cause the intensity distribution of the emission light detected by the detector to be a predetermined light intensity distribution.

Abstract: A laser light source device includes: a first light emitter that emits a first laser beam; a second light emitter that emits a second laser beam; an optical element that converges the first laser beam and the second laser beam; a wavelength dispersing element on which the first laser beam and the second laser beam from the optical element are incident, and which causes optical axes of the first laser beam and the second laser beam to coincide with one another, and then transmits the first laser beam and the second laser beam; and a partially reflecting mirror that returns portions of the first laser beam and the second laser beam from the wavelength dispersing element by reflection, and transmits remaining portions of the first laser beam and the second laser beam that have exited from the wavelength dispersing element. The reflectance of the partially reflecting mirror is wavelength-dependent.

Abstract: A semiconductor laser device includes: a plurality of semiconductor laser elements which emit laser beams with different wavelengths; a plurality of lens portions which collimate the laser beams; a wavelength dispersion element on which the laser beams are incident at different angles, and which changes the traveling directions of the incident laser beams according to the wavelengths to generate an emitted beam that is a combined beam of the laser beams; a plurality of first reflective surfaces which cause the laser beams to be incident on the wavelength dispersion element at the angles corresponding to the laser beams; and a plurality of second reflective surfaces which guide the laser beams to the plurality of first reflective surfaces.

Abstract: The semiconductor laser device includes: semiconductor laser elements; lenses; a deflection element; a wavelength dispersion element that wavelength-couples emitted light beams to form coupled light; and a partial reflection mirror. The lenses include a first lens that reduces a divergence angle of the emitted light beams in a first axis direction, and a second lens that is disposed between the first lens and the wavelength dispersion element and reduces the divergence angle of the laser beams in a second axis direction. The deflection element has planes each corresponding to the emitted light beams, at least one plane among the planes is inclined with respect to an optical axis of a corresponding one of the emitted light beams, which corresponds to each of the at least one plane, and the emitted light beams overlap one another on the wavelength dispersion element.

Abstract: There is provided a distance measurement device that can successfully take in reflected light from a distance measurement area, and at the same time, can achieve compactness of the distance measurement device. The distance measurement device includes a fixed part, a rotating part that is rotatably disposed on the fixed part, a laser light source that is disposed in the fixed part, and a photodetector that is disposed in the fixed part. The distance measurement device further includes a beam splitter that is disposed in the fixed part and separates an optical path of projection light emitted from the laser light source from an optical path of reflected light reflected by a distance measurement area and an imaging lens that is disposed in a common optical path of projection light and reflected light and is used for taking in reflected light reflected by the distance measurement area.

Abstract: A light source device includes a semiconductor light-emitting element; an optical element including lens regions that change an intensity distribution of light emitted from the semiconductor light-emitting element; and a phosphor element that emits, as excitation light, the light with the intensity distribution changed by the optical element. Respective focal points of the lens regions are present in front of or behind a light-emitting surface of the phosphor element in different positions. At least one of the lens regions is astigmatic. An excitation beam from the at least one of the lens regions with the astigmatism forms a circle of least confusion near an associated one of the focal points, and a first focal line and a second focal line sandwiching the circle behind and in front of the circle, respectively. Beams from the lens regions overlap each other on the light-emitting surface of the phosphor element.

Abstract: A light source device includes: a semiconductor light emitting element (laser element); an optical element that has a plurality of lens regions which are a plurality of divided regions, and that changes an intensity distribution of a light beam emitted from the semiconductor light emitting element, by the plurality of lens regions; and a phosphor element that emits light having, as excitation light, the light which has had the intensity distribution changed by the optical element. The phosphor element is disposed so that a light emitting surface of the phosphor element is inclined with respect to a plane having an optical axis of the excitation light as a normal line, the plurality of lens regions have respective first focal points different from each other, and light beams incident on the plurality of lens regions and focused on the first focal points overlap on the light emitting surface of the phosphor element.

Abstract: A light source device includes a semiconductor light-emitting element; an optical element including lens regions that change an intensity distribution of light emitted from the semiconductor light-emitting element; and a phosphor element that emits, as excitation light, the light with the intensity distribution changed by the optical element. Respective focal points of the lens regions are present in front of or behind a light-emitting surface of the phosphor element in different positions. At least one of the lens regions is astigmatic. An excitation beam from the at least one of the lens regions with the astigmatism forms a circle of least confusion near an associated one of the focal points, and a first focal line and a second focal line sandwiching the circle behind and in front of the circle, respectively. Beams from the lens regions overlap each other on the light-emitting surface of the phosphor element.

Abstract: A light source device includes: a holder that has a first surface and a second surface located higher than the first surface, and is an integral structure; a semiconductor light-emitting device on the first surface; an optical element unit that is disposed above the semiconductor light-emitting device, and has a reflective surface that inclines with respect to the first surface and reflects emitted light from the semiconductor light-emitting device; and a phosphor optical element that is disposed on the second surface and irradiated with reflected light from the optical element unit.

Abstract: There is provided a distance measurement device that can successfully take in reflected light from a distance measurement area, and at the same time, can achieve compactness of the distance measurement device. The distance measurement device includes a fixed part, a rotating part that is rotatably disposed on the fixed part, a laser light source that is disposed in the fixed part, and a photodetector that is disposed in the fixed part. The distance measurement device further includes a beam splitter that is disposed in the fixed part and separates an optical path of projection light emitted from the laser light source from an optical path of reflected light reflected by a distance measurement area and an imaging lens that is disposed in a common optical path of projection light and reflected light and is used for taking in reflected light reflected by the distance measurement area.

Abstract: A light source device includes: a semiconductor light emitting device which emits laser light; a wavelength conversion component which emits fluorescence by being irradiated with the laser light emitted from the semiconductor light emitting device as excitation light; and a photodetector on which a portion of light emitted from the wavelength conversion component is incident. The photodetector is disposed at a location off a light path of usable radiation light which is emitted from the wavelength conversion component to a space and used as illumination light.

Abstract: A light source device includes: a semiconductor light-emitting element; a converging optical system which converges the excitation light emitted from the semiconductor light-emitting element; and a wavelength conversion element to which the excitation light is emitted. The wavelength conversion element includes: a first wavelength conversion region where main light enters; and a second wavelength conversion region which is disposed in the surrounding region of the first wavelength conversion region and where the excitation light excluding the main light enters. The wavelength conversion efficiency in the second wavelength conversion region is lower than the wavelength conversion efficiency in the first wavelength conversion region.

Abstract: A wavelength conversion element includes a substrate, a wavelength converting member disposed on at least part of a surface of substrate and having a shape of a plate or film, and a light receiver integrated in the substrate and including a p-n junction composed of a p-type semiconductor and an n-type semiconductor.

Abstract: A light source device includes: a holder that has a first surface and a second surface located higher than the first surface, and is an integral structure; a semiconductor light-emitting device on the first surface; an optical element unit that is disposed above the semiconductor light-emitting device, and has a reflective surface that inclines with respect to the first surface and reflects emitted light from the semiconductor light-emitting device; and a phosphor optical element that is disposed on the second surface and irradiated with reflected light from the optical element unit.

Abstract: A light source device includes: a semiconductor light emitting element (laser element); an optical element that has a plurality of lens regions which are a plurality of divided regions, and that changes an intensity distribution of a light beam emitted from the semiconductor light emitting element, by the plurality of lens regions; and a phosphor element that emits light having, as excitation light, the light which has had the intensity distribution changed by the optical element. The phosphor element is disposed so that a light emitting surface of the phosphor element is inclined with respect to a plane having an optical axis of the excitation light as a normal line, the plurality of lens regions have respective first focal points different from each other, and light beams incident on the plurality of lens regions and focused on the first focal points overlap on the light emitting surface of the phosphor element.

Abstract: In an optical pickup device for both CD and DVD disk media using a two-wavelength laser diode (1), a diffraction grating (11) is commonly used for both laser beams (L1, L2) for CD and DVD to diffract each laser beam into a main beam and a pair of side beams. The diffraction grating includes a first diffraction grating region (11a) and a second diffraction grating region (11b) having a same pitch as the first diffraction grating region and being laterally offset from the first diffraction grating region, and at least one of the first and a second laser beams are diffracted by both of the first and second diffraction grating regions.

Abstract: In an optical pickup device for both CD and DVD disk media using a two-wavelength laser diode (1), a diffraction grating (11) is commonly used for both laser beams (L1, L2) for CD and DVD to diffract each laser beam into a main beam and a pair of side beams. The diffraction grating includes a first diffraction grating region (11a) and a second diffraction grating region (11b) having a same pitch as the first diffraction grating region and being laterally offset from the first diffraction grating region, and at least one of the first and a second laser beams are diffracted by both of the first and second diffraction grating regions.

Abstract: An optical pickup device or an optical disk device includes: a light source 11 that emits a laser beam toward an optical disk 25; an optical receiver 18 that detects light reflected from the optical disk 25; and an astigmatism-generating element 31 that generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk 25 is located ahead of the optical receiver 18 and a focusing position on the other cross section is located behind the optical receiver 18. The astigmatism-generating element 31 is a Fresnel mirror 31a configured to include a plurality of reflecting mirrors, and an imaginary surface 31d that connects the tips of the reflecting mirrors is curved in a concave shape toward a light incidence side.

Abstract: A light source, an objective lens, and an astigmatism generation element producing for light for focus control, and an optical receiver are provided. The astigmatism generation element is interposed between the objective lens and the optical receiver and produces focal points in front of and behind the optical receiver within two mutually orthogonal cross-sectional planes including an optical axis of the reflected light. The astigmatism generation element is a Fresnel mirror that has a plurality of orbicular zones and steps connecting adjacent orbicular zones to each other and that takes the orbicular zones as reflecting mirrors. A depth “d” of the steps is set substantially one-half of a wavelength ?, and a depth d1 of the innermost orbicular zone of the orbicular zones is made larger than the depth d of the steps. The influence of the steps of the Fresnel mirror is minimized, so that a superior servo characteristic can be exhibited.