Abstract: A wavelength converter includes a wavelength conversion layer formed of a ceramic phosphor and having a light incident surface on which excitation light is incident and a light exiting surface which faces the light incident surface, a light transmitting layer formed integrally with the light incident surface of the wavelength conversion layer, and a light transmitting member provided on a side of the light transmitting layer that is the side on which the excitation light is incident. The light transmitting layer and the light transmitting member are bonded to each other with the aid of optical contact.

Abstract: A light source apparatus includes a light source section that outputs first and second light beam fluxes, first and second polarization separation elements, a rotary diffuser plate that diffuses the first light beam flux and the second light beam flux, a first retardation film that converts the incident second light beam flux polarized in a first direction into the second light beam flux polarized in a second direction, and a wavelength conversion element on which the first light beam flux polarized in the first direction and the second light beam flux polarized in the second direction, are incident and which converts the first and second light beam fluxes into a third light beam flux that belongs to a wavelength band different from the wavelength band to which the first and second light beam fluxes belong. The third light beam flux passes through the first and second polarization separation elements.

Abstract: An illumination device includes a light source unit including a plurality of light source regions and outputting a first color light, a light branch element that reflects a light output from at least one light source region of the plurality of light source regions and branches the first color light into a first component and a second component traveling in different directions from each other, and a wavelength conversion element provided in an optical path of the second component and excited by the second component to output a fluorescent light containing a second color light. A position of the light branch element in an arrangement direction of the plurality of light source regions is adjustable.

Abstract: An illumination device includes a first light source section which includes at least one first light emitting element adapted to emit first colored light collimated, and is adapted to emit first light including the first colored light, and a light beam magnifying optical system adapted to magnify the first light. The light beam magnifying optical system includes first through fourth lens surfaces arranged in sequence from an incident side of the first light, the first lens surface is formed of a spherical surface having power, the second lens surface is formed of a first anamorphic surface having power with the same sign as the sign of the power of the first lens surface, the third lens surface is formed of a second anamorphic surface having positive power, and the fourth lens surface is formed of a spherical surface having positive power.

Abstract: An illuminator includes a light source apparatus that outputs light, a light collecting system on which the light is incident, and a diffuser element on which the collected light flux having exited out of the light collecting system is incident. The light includes a first light beam flux that occupies an area including the optical axis of the light collecting system and a second light beam flux that occupies the area outside the first light beam flux. The position where the first light beam flux is focused in the direction of the optical axis by the light collecting system differs from the position where the second light beam flux is focused in the direction of the optical axis by the light collecting system.

Abstract: An optical transmitter includes: a splitter; a first optical modulator and a second optical modulator that modulate each of light beams split by the splitter; a first semiconductor optical amplifier (SOA) and a second SOA that are connected to a subsequent stage of the first optical modulator and a subsequent stage of the second optical modulator, respectively; a first detector and a second detector that detect light output intensity of the first SOA and light output intensity of the second SOA, respectively; a controller that sets gains of the first and second SOAs such that the first and second SOAs are equal in the light output intensity based on detection values of the first and second detectors; and a combiner that combines an output light beam of the first SOA and an output light beam of the second SOA.

Abstract: A light source device includes at least one first light emitting device configured to emit first light of a first color in a first direction and a plurality of second light emitting devices configured to emit second light of a second color different from the first color in the first direction. The number of the plurality of second light emitting devices is larger than the number of the at least one first light emitting device. The plurality of second light emitting devices are substantially rotationally symmetrically provided around the center axis of a first light in a peripheral region of the at least one first light emitting device.

Abstract: A light source device, an illumination device, and a projector which are capable of thinning a bundle of light beams while being low in a focal magnification ratio, and are small in size are to be provided. The light source device includes a first light source unit adapted to emit a first light beam, a second light source unit adapted to emit a bundle of light beams including a second light beam and a third light beam, a reduction optical system adapted to reduce the bundle of light beams, and a combining optical system adapted to combine the first light beam and the reduced bundle of light beams with each other. The combining optical system is provided with a light transmitting area and a light reflecting area.

Abstract: A light source device, an illumination device, and a projector which are capable of thinning a bundle of light beams while being low in a focal magnification ratio, and are small in size are to be provided. The light source device includes a first light source unit adapted to emit a first light beam, a second light source unit adapted to emit a bundle of light beams including a second light beam and a third light beam, a reduction optical system adapted to reduce the bundle of light beams, and a combining optical system adapted to combine the first light beam and the reduced bundle of light beams with each other. The combining optical system is provided with a light transmitting area and a light reflecting area.

Abstract: A light source apparatus according to an aspect of the invention includes a light source unit including a light source section that includes a plurality of semiconductor laser devices and a collimation system, a light beam flux compression system, and a homogenizing system. In a position upstream of the light beam flux compression system, a major axis direction and a minor axis direction of the cross section of each of the plurality of laser light beams are so defined that one of the two directions in which the light beam flux is thicker than in the other direction is a first direction, and the direction in which the light beam flux compression system has maximum refractive power is defined as a maximum refraction direction, and the angle between the maximum refraction direction and the first direction is greater than 0° but smaller than 45°.

Abstract: In a photographing apparatus, a low-pass selector controller (processor) is configured to perform a plurality of photographing operations including an LPF-ON photographing operation, which obtains an image signal from an image sensor in a state where the image sensor has been LPF driven by the image-shake correction device (driver) and obtains an optical low-pass filter effect, and an LPF-OFF photographing operation, which obtains an image signal from the image sensor in a state where the image sensor has not been LPF driven by the image-shake correction device (driver) and does not obtain an optical low-pass filter effect.

Abstract: Alight source apparatus includes alight source section having a first area and a second area, a first condensing optical system, a second condensing optical system, a wavelength conversion element, a reflection element, and a wavelength selective polarization element. The first area and the second area respectively emit a first light ray flux and a second light ray flux. The first light ray flux passes through the first condensing optical system to excite the wavelength conversion element. The excited wavelength conversion element emits fluorescence. The second light ray flux passes through the wavelength selective polarization element and the second condensing optical system to enter the reflection element. The wavelength selective polarization element transmits the fluorescence irrespective of the polarization state of the fluorescence to combine the second light ray flux reflected by the reflection element with the fluorescence.

Abstract: An illumination device includes a light source unit including a plurality of light source regions and outputting a first color light, a light branch element that reflects a light output from at least one light source region of the plurality of light source regions and branches the first color light into a first component and a second component traveling in different directions from each other, and a wavelength conversion element provided in an optical path of the second component and excited by the second component to output a fluorescent light containing a second color light. A position of the light branch element in an arrangement direction of the plurality of light source regions is adjustable.

Abstract: A light source device including a light emitting device that emits a first light and a second light; a first light separation element that separates the first light into a first light beam flux and a second light beam flux; a second light separation element that separates the second light into a third light beam flux and a fourth light beam flux; at least one fluorescent body layer that includes a first fluorescence emitting section on which the first light beam flux is incident and a second fluorescence emitting section on which the third light beam flux is incident; and at least one diffusion section that includes a first diffusion light emitting section on which the second light beam flux is incident and a second diffusion light emitting section on which the fourth light beam flux is incident.

Abstract: An illuminator includes first and second light emitting devices that emit first and second light beams, respectively, first and second lens arrays, a light ray combining element that combines at least parts of the first and second light beams having passed through the first and second lens arrays with each other to produce a combined light ray flux, a light collection lens, and a diffused light producing element on which the combined light ray flux having passed through the light collection lens is incident.

Abstract: A wavelength conversion element according to an aspect of the invention includes a wavelength conversion layer having a light incident surface on which excitation light is incident and a light exiting surface that faces away from the light incident surface and a cooler including a support member that supports the wavelength conversion layer and a light transmissive member that has a curved surface that protrudes in the direction opposite the direction in which the excitation light travels, faces the light incident surface of the wavelength conversion layer, and is bonded to the support member via a bonding member. An air layer provided between the light incident surface of the wavelength conversion layer and the light transmissive member, and the air layer is thinner than the bonding member.

Abstract: An illuminator includes a first light source unit that outputs first light beams and a second light source unit that outputs second light beams. A polarization combining element combines the first and second light beams with each other. A polarization state conversion element which receives the combined light includes retardation elements that are separate from one another and arranged in a first direction. The light source units are so configured that first regions through which the first light beams pass and second regions through which the second light beams pass are alternately arranged in the first direction in the polarization state conversion element. A polarization separation element separates the combined light having passed through the polarization state conversion element into first light and second light. A wavelength conversion element converts the first light into third light. The illuminator outputs the second light and the third light.

Abstract: A light source device includes: a light emission element; a condensing optical system on which a first component of light emitted from the light emission element is incident; an optical element on which the first component transmitted through the condensing optical system is incident; and a pickup optical system on which the first component having travelled via the optical element is incident. At least one of the condensing optical system and the pickup optical system includes a first lens formed of quartz.

Abstract: A light source device includes a light source array including at least one light emitting part, a collimating optical system that receives a light beam bundle emitted from the light source array, a first lens array including a plurality of first small lenses that receives the light beam bundle having passed through the collimating optical system, and a second lens array that is disposed in a subsequent stage of the first lens array and includes a plurality of second small lenses corresponding respectively to the first small lenses. The planar shape of the light emission area of the light emitting part has a short-side direction and a longitudinal direction. The planar shape of the second small lens has a longitudinal direction. The short-side direction of the light emission area crosses the longitudinal direction of the second small lens.

Abstract: A light source device of the invention includes an excitation light source, a wavelength conversion layer having a light incident surface and a light exiting surface, a reflection member, and a pickup system, wherein the light exiting surface at least has a first light exiting surface with a tilt with respect to an optical axis of the pickup system and a second light exiting surface with a tilt with respect to the first light exiting surface, the reflection member has a reflection surface along the optical axis of the pickup system and an end portion on the pickup system side extends closer to the pickup system than the light exiting surface, and a focal point of the pickup system is formed on a plane crossing the optical axis of the pickup system and containing the end portion of the reflection member.