Abstract: A first optical communication device is provided with a laser light source 3 for emitting communication light CL and a transmitting optical fiber 11 arranged in water WA and having a light incident end portion 14 on which the communication light CL is incident. The transmitting optical fiber 11 transmits the communication light CL incident on the light incident end portion 14 toward the tip end portion 15. The transmitting optical fiber 11 is provided with a core part 21 configured to transmit the communication light CL from the light incident end portion 14 toward the tip end portion 15 and a clad part 23 covering the core part, the clad part being configured to emit at least a part of the communication light CL that transmits the core part 21 from a side surface of the transmitting optical fiber 11.

Abstract: A gas measurement apparatus includes an optical resonator that resonates light, a light source that generates light for irradiation of the optical resonator, and a photodetector that detects light taken out of the optical resonator. The optical resonator includes a plurality of mirrors, a holding member, a hollow tubular member, a hollow tubular member, and a temperature adjustment instrument. The holding member is lower in thermal expansion coefficient than the hollow tubular member. The hollow tubular member includes a portion higher in thermal conductivity than the holding member and a bellows higher in elasticity than a first portion. The hollow tubular member is equal to or higher than the hollow tubular member in thermal conductivity, and is provided as far as positions of the plurality of mirrors on an inner side of the bellows.

Abstract: A first optical communication device is provided with a laser light source 3 for emitting communication light CL and a transmitting optical fiber 11 arranged in water WA and having a light incident end portion 14 on which the communication light CL is incident. The transmitting optical fiber 11 transmits the communication light CL incident on the light incident end portion 14 toward the tip end portion 15. The transmitting optical fiber 11 is provided with a core part 21 configured to transmit the communication light CL from the light incident end portion 14 toward the tip end portion 15 and a clad part 23 covering the core part, the clad part being configured to emit at least a part of the communication light CL that transmits the core part 21 from a side surface of the transmitting optical fiber 11.

Abstract: This optical coupling device couples a plurality of beams to a single fiber. A plurality of light sources is arranged at predetermined intervals and emits the plurality of beams. A plurality of collimating lens is arranged to face the plurality of light sources and collimates the plurality of beams emitted from the plurality of light sources. A reduction optical system reduces the beam diameter of the plurality of beams collimated by the plurality of collimating lens. A focusing lens focuses the plurality of beams reduced by the reduction optical system on a fiber. A first distance between the light source and the collimating lens arranged so as to correspond to a beam passing through the center of the reduction optical system is different from a second distance between the light source and the collimating lens arranged so as to correspond to a beam passing through the end portion of the reduction optical system.

Abstract: A laser apparatus includes six first laser devices that output respective blue laser beams for preliminary heating of an object, and a second laser device that outputs an infrared laser beam for main heating of the object. At least one of a relative positional relationship and each of respective first irradiation positions of the blue laser beams is changeable, the relative positional relationship being a relative positional relationship between the respective first irradiation positions of the six first laser beams in the object and a second irradiation position of the infrared laser beam in the object.

Abstract: Provided is a laser processing device capable of detecting that a return light of a laser light reflected by a processing object is incident on a laser light source. The laser processing device includes: a laser light source which outputs a laser light for processing; a light source for inspection which outputs a laser light for inspection having a wavelength different from that of the laser light for processing; an optical waveguide in which the laser light for processing and the laser light for inspection are incident from an incident surface, and the laser light for processing and the laser light for inspection are emitted from an emission surface toward a processing object; and a detector which detects a return light of the laser light for inspection reflected by the processing object, incident from the emission surface of the optical waveguide and emitted from the incident surface.

Abstract: A light-emitting device improves the beam quality of emission light from a single emitter light source in the slow-axis direction, and includes a light source 10 having a single emitter and a beam shaping module that splits the emission light from the light source into to a plurality of split-lights in the slow-axis direction, and shapes the split-lights as a shaped-beam arrayed in the fast-axis direction, and outputs the shaped-beam.

Abstract: This optical coupling device couples a plurality of beams to a single fiber. A plurality of light sources is arranged at predetermined intervals and emits the plurality of beams. A plurality of collimating lens is arranged to face the plurality of light sources and collimates the plurality of beams emitted from the plurality of light sources. A reduction optical system reduces the beam diameter of the plurality of beams collimated by the plurality of collimating lens. A focusing lens focuses the plurality of beams reduced by the reduction optical system on a fiber. A first distance between the light source and the collimating lens arranged so as to correspond to a beam passing through the center of the reduction optical system is different from a second distance between the light source and the collimating lens arranged so as to correspond to a beam passing through the end portion of the reduction optical system.

Abstract: A laser device includes: a plurality of collimating lenses collimate light emitted from the plurality of light sources; a plurality of holders each hold a pair of light sources and the collimating lens and which adjust emission positions and emission angles of the collimated light of the collimating lenses; a housing which holds the plurality of holders; a light condensing part which condenses each of the collimated light whose emission position and emission angle are adjusted; a heat exhausting member which exhausts heat generated from the plurality of light sources; and a heat transfer member which is disposed between the heat exhausting surfaces of the light sources and a heat absorbing surface of the heat exhausting member, includes an elastic part abutting against the heat exhausting surfaces and the heat absorbing surface, has heat conductivity, and transfers the heat from the heat exhausting surfaces to the heat absorbing surface.

Abstract: A laser device has a plurality of laser diodes; a plurality of optical elements installed corresponding to the plurality of the laser diodes; a plurality of units formed by fixing the laser diodes and the optical elements per each laser diode and installed corresponding to the plurality of the laser diodes; a converging element that converges laser beams emitted from the plurality of the laser diodes to a fiber; a housing element houses the plurality of the units and the converging element; and a thermal transfer plate performs heat dissipation of the plurality of the units. The heat resistance reducing element having a heat resistance value that is smaller than a predetermined value is installed between the thermal transfer plate and each unit or the processing for reducing the heat resistance is performed.

Abstract: A laser device includes: a plurality of collimating lenses collimate light emitted from the plurality of light sources; a plurality of holders each hold a pair of light sources and the collimating lens and which adjust emission positions and emission angles of the collimated light of the collimating lenses; a housing which holds the plurality of holders; a light condensing part which condenses each of the collimated light whose emission position and emission angle are adjusted; a heat exhausting member which exhausts heat generated from the plurality of light sources; and a heat transfer member which is disposed between the heat exhausting surfaces of the light sources and a heat absorbing surface of the heat exhausting member, includes an elastic part abutting against the heat exhausting surfaces and the heat absorbing surface, has heat conductivity, and transfers the heat from the heat exhausting surfaces to the heat absorbing surface.

Abstract: An underwater laser source is used in water and comprises a water pressure-resistant cylinder A having a light emission window 4, and the water pressure-resistant cylinder A comprises a plurality of semiconductor lasers 11a-11f, and converging lens 13 that converges each laser light from the plurality of semiconductor lasers 11a-11f, and emits converged each laser light to the light emission window 4.

Abstract: The present invention comprises: a light-emitting element group configured from columns of serially connected light-emitting elements, one of the ends from each of the columns of the light-emitting elements being collectively connected to a power source; current control elements, provided to correspond to the columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the columns of the light-emitting elements reach a threshold value or lower.

Abstract: The present invention comprises: a light-emitting element group configured from columns of serially connected light-emitting elements, one of the ends from each of the columns of the light-emitting elements being collectively connected to a power source; current control elements, provided to correspond to the columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the columns of the light-emitting elements reach a threshold value or lower.

Abstract: A plurality of optical elements are provided in correspondence with a plurality of laser diodes, and make the plurality of beams emitted from the plurality of laser diodes parallel. A plurality of selective transmission elements are provided in correspondence with the plurality of optical elements and selectively transmit the beams emitted from the plurality of laser diodes or beams excluding an outer periphery portion of the beams emitted from the plurality of optical elements. One or more light traveling direction control members control light traveling directions of the plurality of beams having passed through the plurality of optical elements and the plurality of selective transmission elements so as to move the plurality of beams to the vicinity of an optical axis of the fiber. A light converging unit converges the plurality of beams emitted from the one or more light traveling direction control members to the fiber.

Abstract: An underwater laser source is used in water and comprises a water pressure-resistant cylinder A having a light emission window 4, and the water pressure-resistant cylinder A comprises a plurality of semiconductor lasers 11a-11f, and converging lens 13 that converges each laser light from the plurality of semiconductor lasers 11a-11f, and emits converged each laser light to the light emission window 4.

Abstract: A light-emitting device improves the beam quality of emission light from a single emitter light source in the slow-axis direction, and includes a light source 10 having a single emitter and a beam shaping module that splits the emission light from the light source into to a plurality of split-lights in the slow-axis direction, and shapes the split-lights as a shaped-beam arrayed in the fast-axis direction, and outputs the shaped-beam.

Abstract: Provided is a laser processing device capable of detecting that a return light of a laser light reflected by a processing object is incident on a laser light source. The laser processing device includes: a laser light source which outputs a laser light for processing; a light source for inspection which outputs a laser light for inspection having a wavelength different from that of the laser light for processing; an optical waveguide in which the laser light for processing and the laser light for inspection are incident from an incident surface, and the laser light for processing and the laser light for inspection are emitted from an emission surface toward a processing object; and a detector which detects a return light of the laser light for inspection reflected by the processing object, incident from the emission surface of the optical waveguide and emitted from the incident surface.

Abstract: The present invention comprises: a light-emitting element group configured from columns of serially connected light-emitting elements, one of the ends from each of the columns of the light-emitting elements being collectively connected to a power source; current control elements, provided to correspond to the columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the columns of the light-emitting elements reach a threshold value or lower.

Abstract: An optical coupling module reduces a number of optical elements, and includes a collimate lens 2a that collimates a light from the first semiconductor laser 1a and then outputs the first collimate light, a collimate lens 2b that collimates a light from the semiconductor laser 1b in a location at which an emission plane is approximately orthogonal to an emission plane of the semiconductor laser 1a and outputs the second collimate light. The collimate lens 2c collimates light from semiconductor laser 1c in-place in the location at which the emission plane faces the emission plane of the semiconductor laser 1b and outputs a third collimate light. A prism mirror 3 has a rectangular prism with a first reflection plane that reflects the second collimate light to a parallel direction to the first collimate light and a second reflection plane orthogonal to the first reflection plane and reflects the third collimate light to the parallel direction to the first collimate light.