Abstract: The disclosure relates to a light source device including a blue laser emitting element configured to emit a blue laser beam, a red laser emitting element configured to emit a red laser beam, a phosphor excited by the blue laser beam to generate yellow fluorescence, a combiner configured to combine the yellow fluorescence and a part of the blue laser beam with each other to generate composite light, a polarization conversion element disposed in a posterior stage of the combiner, and a mirror disposed at a light emission side of the polarization conversion element to reflect the red laser beam, wherein the mirror is located at a position failing to overlap the composite light emitted from the polarization conversion element.

Abstract: Two input waveguides are made of a semiconductor material. One output waveguide is made of a semiconductor material. A multi-mode-interference part is made of a semiconductor material. The multi-mode-interference part has an incoming end surface connected to the input waveguides, and an outgoing end surface opposite to the incoming end surface and connected to the output waveguide. The multi-mode-interference part has a waveguide width wider than the waveguide widths of the input waveguides and the waveguide width of the output waveguide. Two unwanted-light waveguides are made of a semiconductor material. The unwanted-light waveguides are connected to the outgoing end surface of the multi-mode-interference part so as to sandwich the output waveguide. The unwanted-light waveguides each satisfy a single-mode condition.

Abstract: An illuminator according to an aspect of the invention includes a light source apparatus including a first light emitter that emits first light having a first color, a plurality of second light emitters that each emit second light having a second color, and a plurality of third light emitters that each emit third light having a third color, a rod integrator that combines the first light, the second light, and the third light with one another, a first lens that causes the first light, the second light, and the third light to be focused in the rod integrator, and a second lens that transmits only the first light out of the first light, the second light, and the third light. The plurality of second light emitters and the plurality of third light emitters are so disposed as to surround the first light emitter.

Abstract: A light source device includes a blue laser emitting element, a red laser emitting element, a phosphor for emitting fluorescence, a diffusely reflecting element, a polarization splitting/combining element configured to guide a first polarization component of a blue laser beam and a red laser beam to the diffusely reflecting element, and guide a second polarization component of the blue laser beam to the phosphor, a first wave plate, a light combining element, and a second wave plate. The polarization splitting/combining element splits a red first polarization component, a green component and a red second polarization component, and guides first composite light to the second wave plate, the first composite light being formed by combining the green component, the red first polarization component. The light combining element combines a part of second composite light and the red second polarization component with each other to generate illumination light.

Abstract: An infrared light source radiates infrared light. An ATR prism receives, on a first end face, the infrared light radiated from the infrared light source, causes the received infrared light to pass therethrough while repeating total reflection off a second end face and a third end face, and emits the infrared light that has passed therethrough from the third end face. An infrared photodetector detects the intensity of the infrared light emitted from the ATR prism. Strain sensors, which are contact sensors of one type, are attached to the ATR prism and configured to detect a contact state between the ATR prism and a measurement skin.

Abstract: An infrared light source radiates, to an ATR prism, infrared light in entirety or part of a wavelength range with absorption wavelengths of a biological material. The ATR prism is adherable to a measurement skin. A prism vibration controller is mounted on the ATR prism and vibrates the ATR prism perpendicular to a contact surface between the ATR prism and the measurement skin. A controller causes an infrared photodetector to detect infrared light in synchronization with the vibration of the ATR prism.

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 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.

Abstract: A timing adjuster shifts a timing between a first data-stream group and a second data-stream group in accordance with a timing setting. A data generator in first test mode generates a first test-data stream repeating 2N-bit marks and 2N-bit spaces as each of a first data stream and a third data stream, and generates a second test-data stream that is N-bit shifted from the first test-data stream, where N denotes a natural number. A first phase-difference setting and a second phase-difference setting are rendered zero. The timing adjuster adjusts the timing setting so as to maximize a detected value from a peak detection circuit.

Abstract: An illumination device includes a light source device, a first collimate optical system on which a light beam emitted from the light source device is made incident, a condensing optical system provided at a post-stage of the first collimate optical system, a rod provided at a post-stage of the condensing optical system, a second collimate optical system provided at a post-stage of the rod, a lens integrator provided at a post-stage of the second collimate optical system, and a superimposing lens provided at a post-stage of the lens integrator. The lens integrator includes a first lens array and a second lens array provided at a post-stage of the first lens array. A light-emitting end face of the rod and a lens surface of the second lens array are substantially conjugate with each other.

Abstract: An optical modulator having a small-sized circuit and a smaller voltage drop in a terminating resistor is provided. The optical modulator includes first and second optical waveguides, a first electrode inputting a first high frequency signal into the first optical waveguide, a second electrode inputting a second high frequency signal having a reverse phase relative to the first high frequency signal into the second optical waveguide, a first terminating resistor connected to the first electrode, a second terminating resistor connected to the second electrode, a connection point connecting the first and second electrodes via the first and second terminating resistors, and a DC voltage supply connected to the connection point. A resistance value of the first terminating resistor is equal to a characteristic impedance of the first electrode. A resistance value of the second terminating resistor is equal to a characteristic impedance of the second electrode.

Abstract: A light source device is provided with a blue laser emitting element, a red laser emitting element, a light combining element, a diffusely reflecting element, a phosphor, a polarization splitting/combining element having a polarization split function, and a first wave plate. The polarization splitting/combining element guides a blue first polarization component obtained by performing polarization split on the light from the blue laser emitting element, and the light from the red laser emitting element to the diffusely reflecting element, and guides a blue second polarization component obtained by performing polarization split on the light from the blue laser emitting element to the phosphor. Then, the polarization splitting/combining element emits red diffused light, blue diffused light, a red polarization split component, and a principal fluorescence component obtained by removing the first red fluorescence component from fluorescence in one direction to thereby generate illumination light.

Abstract: A light source device includes a blue laser emitting element, a red laser emitting element, a phosphor for emitting fluorescence, a diffusely reflecting element, a polarization splitting/combining element configured to guide a first polarization component of a blue laser beam and a red laser beam to the diffusely reflecting element, and guide a second polarization component of the blue laser beam to the phosphor, a first wave plate, a light combining element, and a second wave plate. The polarization splitting/combining element splits a red first polarization component, a green component and a red second polarization component, and guides first composite light to the second wave plate, the first composite light being formed by combining the green component, the red first polarization component. The light combining element combines a part of second composite light and the red second polarization component with each other to generate illumination light.

Abstract: A light source apparatus includes a blue laser light emitter, a red laser light emitter, a phosphor that produces yellow fluorescence, a first optical element that combines the yellow fluorescence with a second component of the blue laser light to produce first combined light containing a red component, a green component, and a blue component, a second optical element that reflects the red laser light, transmits a first polarized component in the red component, reflects a second polarized component in the red component, transmits the green component and the blue component, and combines the red laser light, the first polarized component, the green component, and the blue component with one another to produce second combined light, a retardation film provided at a downstream side of the second optical element, and a third optical element that combines part of third combined light with the second polarized component to produce illumination light.

Abstract: The disclosure relates to a light source device including a blue laser emitting element configured to emit a blue laser beam, a red laser emitting element configured to emit a red laser beam, a phosphor excited by the blue laser beam to generate yellow fluorescence, a combiner configured to combine the yellow fluorescence and a part of the blue laser beam with each other to generate composite light, a polarization conversion element disposed in a posterior stage of the combiner, and a mirror disposed at a light emission side of the polarization conversion element to reflect the red laser beam, wherein the mirror is located at a position failing to overlap the composite light emitted from the polarization conversion element.

Abstract: A light source apparatus, an illuminator, and a projector that output a reduced light beam flux in a direction roughly the same as the direction of the optical axis of an incident light beam flux. The light source apparatus includes a light source unit that outputs a light beam flux and a reduction system that includes a plurality of optical elements and reduces the cross section of the light beam flux. The optical elements each have first and second surfaces and first and second reflection surfaces and allow a corresponding light beam of the light beam flux to pass through the first surface, to be incident on the first reflection surface, to be sequentially reflected off the first reflection surface and the second reflection surface, and then to exit through the second surface to shift the optical path of the light beam in a first direction.

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 wavelength conversion device includes a phosphor layer that is excited by excitation light to thereby emit light in a wavelength band different from a wavelength band of the excitation light, a base material that includes a first surface and holds the phosphor layer on the first surface, and a third lens disposed to be opposed to the phosphor layer. An opening section juxtaposed with the phosphor layer is provided on the first surface. A channel that causes the opening section and the outside of the wavelength conversion device to communicate is provided in the base material. The third lens includes an opposed surface opposed to the phosphor layer and the opening section.

Abstract: An optical ring circuit for modulating light from a light source into an optical signal includes a ring modulator located near a waveguide to couple a light propagating the waveguide, the ring modulator including a pair of electrodes, a signal generator to transmit an electrical signal corresponding to the optical signal, a filter circuit to generate an output signal, wherein the filter circuit includes an adder unit and at least one tap unit having a delay unit and a coefficient unit, wherein the adder unit adds the electrical signal from the signal generator and a signal passed from the tap unit for pre-compensating signal components of the electrical signal by at least twice delay time of the delay unit, and a driver circuit to apply a voltage to the electrodes based on the output signal.

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.