Abstract: Herein disclosed is a LiDAR device including: a light source to output laser light; a demultiplexer/distributor to receive the laser light output from the light source and to output local oscillation light and signal light beams; amplifiers to amplify the respective signal light beams; light transmission/reception devices to emit, as transmission light, the signal light beams into space, and to receive, as reception light, scattered light from a measurement target present in space; a signal processing device to calculate a distance to the measurement target and a property of the measurement target on a basis of the reception light from the light transmission/reception devices and the local oscillation light from the demultiplexer/distributor; and transmission/reception separation devices to couple the transmission light from the amplifiers to the respective light transmission/reception devices and to couple the reception light received by the respective light transmission/reception devices to the correspondin

Abstract: In a laser radar device according to the present disclosed technique, a frequency of laser light to be emitted adopts discrete values based on intervals of a frequency difference F are adopted. Therefore, TOF corresponding to a distance to a target appears in units of the frequency difference F for each time T, and a Doppler frequency corresponding to a speed of the target appears as a finer change than the frequency difference F. As described above, the present disclosed technique provides a laser radar device including a mechanism for separating frequency information resulting from the distance to the target from frequency information resulting from a speed of the target by a simple method.

Abstract: A planar waveguide amplifier includes a planar waveguide including a flat plate-like core; a first cladding provided on a first principal face of the core; and a second cladding provided on a second principal face of the core, and signal light and pumping light travel into the planar waveguide so that the signal light and the pumping light propagate inside the core in such a manner that optical paths of the signal light and the pumping light overlap each other, and in a zig-zag manner, and the core is an amplification medium containing a rare-earth element serving as an active ion of a three-level system, and absorbs the signal light on the basis of a reduction in intensity of the pumping light.

Abstract: Included are: a first dielectric multilayer film (15) for transmitting a wavelength band including a wavelength of signal light (2) and reflecting first excitation light (4), the first dielectric multilayer film (15) being disposed on one of two end surfaces of a core (11), a first inner cladding (12), a first outer cladding (13), and a second outer cladding (14); and a second dielectric multilayer film (12) for transmitting a wavelength band including the wavelength of the signal light (2) and reflecting the first excitation light (4), the second dielectric multilayer film (12) being disposed on the other one of the two end surfaces.

Abstract: In a plane perpendicular to the optical axis (10) of a lens (2), the direction in which the cylindrical surface has zero curvature is the direction of generatrix of the lens (2), and the direction in which the cylindrical surface has non-zero curvature and that is orthogonal to the direction of generatrix is the direction of curvature of the lens (2). A light source (1) is disposed at the focal position (21) in the direction of generatrix on the side of the incident surface (3) of the lens (2), and emits light toward the incident surface (3) of the lens (2), the light having a difference between the divergence angle in the direction of generatrix of the lens (2) and the divergence angle in the direction of curvature of the lens (2).

Abstract: A laser amplifier includes a planar optical waveguide for laser amplification, and an input optical system for inputting signal light to a core layer of the planar optical waveguide. The input optical system includes: a collimating lens for converting output light from a signal light source into parallel light; an anamorphic prism for reducing the beam width in a first direction of output light from the collimating lens; and a cylindrical lens for collecting output light from the anamorphic prism in a second direction, and output light from the cylindrical lens is input to the core layer.

Abstract: A lens (10) has an incidence surface (11) having a cylindrical shape and forming a concave shape, and an emitting surface (12) forming a convex shape with respect to an optical axis (10a). A light source (20) has a large divergence angle in a vertical direction, and a divergence angle in a horizontal direction which is smaller than that in the vertical direction. The light source (20) is located at a position of focal length of the lens (10) in the vertical direction on a side of the incidence surface. The horizontal direction of the light source (20) is aligned with a curvature direction of the cylindrical shape of the lens (10).

Abstract: In a plane perpendicular to the optical axis (10) of a lens (2), the direction in which the cylindrical surface has zero curvature is the direction of generatrix of the lens (2), and the direction in which the cylindrical surface has non-zero curvature and that is orthogonal to the direction of generatrix is the direction of curvature of the lens (2). A light source (1) is disposed at the focal position (21) in the direction of generatrix on the side of the incident surface (3) of the lens (2), and emits light toward the incident surface (3) of the lens (2), the light having a difference between the divergence angle in the direction of generatrix of the lens (2) and the divergence angle in the direction of curvature of the lens (2).

Abstract: Included are: a first dielectric multilayer film (15) for transmitting a wavelength band including a wavelength of signal light (2) and reflecting first excitation light (4), the first dielectric multilayer film (15) being disposed on one of two end surfaces of a core (11), a first inner cladding (12), a first outer cladding (13), and a second outer cladding (14); and a second dielectric multilayer film (12) for transmitting a wavelength band including the wavelength of the signal light (2) and reflecting the first excitation light (4), the second dielectric multilayer film (12) being disposed on the other one of the two end surfaces.

Abstract: A diffractive optical element according to the present disclosure includes: a plurality of diffractive optical element segments, each diffractive optical element segment having an asperity shape on the segment's surface to vary phases of light entering the segment according to positions on the segment's surface which the light enters, the each diffractive optical element segment projecting, when the light enters, light having a phase distribution to form a light pattern, wherein the diffractive optical element segments are arranged on a same plane and have, on their surfaces, asperity shapes which are different from each other and correspond to respective light patterns different from each other, the light patterns being formed by light's entering the respective diffractive optical element segments, and wherein the diffractive optical element segments are arranged in respective regions on the diffractive optical element, which are partitioned by lines radially extending from a center of the diffractive optica

Abstract: A light pattern generator of the present disclosure includes: a laser light source to output laser light; a condenser lens to refract the laser light outputted from the laser light source; a mask to absorb or reflect part of the refracted light outputted from the condenser lens, the mask transmitting the rest of the refracted light; and a diffractive optical element to change a phase of the transmitted light in accordance with a position on a plane perpendicular to a direction in which the light transmitted through the mask travels and to output light having a phase distribution to form a light pattern, wherein the condenser lens is placed at a first position which is the condenser lens's focal length distant from the laser light source. This configuration makes it possible to form a plurality of types of light patterns by using a single diffractive optical element.

Abstract: A lens (10) has an incidence surface (11) having a cylindrical shape and forming a concave shape, and an emitting surface (12) forming a convex shape with respect to an optical axis (10a). A light source (20) has a large divergence angle in a vertical direction, and a divergence angle in a horizontal direction which is smaller than that in the vertical direction. The light source (20) is located at a position of focal length of the lens (10) in the vertical direction on a side of the incidence surface. The horizontal direction of the light source (20) is aligned with a curvature direction of the cylindrical shape of the lens (10).

Abstract: Disclosed is a planar waveguide including: a core (11) which is a flat plate through which light propagates; a cladding (12) which is a flat plate for reflecting the light in a state of being joined to an upper surface of the core (11); and a cladding (13) which is a flat plate for reflecting the light in a state of being joined to a lower surface of the core (11), in which each of the claddings (12) and (13) is a multilayer film in which multiple films made from different materials are layered. As a result, a material having a low index of refraction can be used as the material of the core (11), and the limit on materials usable as the material of the core (11) is relaxed.

Abstract: Disclosed is a planar waveguide including: a core (11) which is a flat plate through which light propagates; a cladding (12) which is a flat plate for reflecting the light in a state of being joined to an upper surface of the core (11); and a cladding (13) which is a flat plate for reflecting the light in a state of being joined to a lower surface of the core (11), in which each of the claddings (12) and (13) is a multilayer film in which multiple films made from different materials are layered. As a result, a material having a low index of refraction can be used as the material of the core (11), and the limit on materials usable as the material of the core (11) is relaxed.

Abstract: A device includes: at least one laser element with light emitting points to output fundamental waves in a one-dimensional array; a wavelength converting element to carry out wavelength conversion of the incident fundamental waves, and to output wavelength converted light rays; and an output mirror to reflect the fundamental waves, and to transmit the wavelength converted light rays resulting from the wavelength conversion by the wavelength converting element. The wavelength converting element is disposed between the laser element and the output mirror, and the distance between the position of a waist of the fundamental waves output from the laser element and the output mirror is set in accordance with a Talbot condition under which the adjacent light emitting points cause phase synchronization with each other.

Abstract: A device includes: at least one laser element with light emitting points to output fundamental waves in a one-dimensional array; a wavelength converting element to carry out wavelength conversion of the incident fundamental waves, and to output wavelength converted light rays; and an output mirror to reflect the fundamental waves, and to transmit the wavelength converted light rays resulting from the wavelength conversion by the wavelength converting element. The wavelength converting element is disposed between the laser element and the output mirror, and the distance between the position of a waist of the fundamental waves output from the laser element and the output mirror is set in accordance with a Talbot condition under which the adjacent light emitting points cause phase synchronization with each other.