Abstract: A distance measuring device includes a light source unit configured to emit an emitted light, an optical path splitting unit configured to split a reflected light from an object into optical paths, a lens unit including lenses configured to condense the reflected light split by the optical path splitting unit, receiving units configured to perform heterodyne detection on combined lights of the reflected light and a reference light and output beat signals, Fourier transforming units configured to perform a Fourier transform on the beat signals to obtain power spectra, and a peak extracting unit configured to extract a peak frequency having a correlation with a distance to the object from a sum of the power spectra. The optical path splitting unit splits the reflected light using a beam splitter independent of a polarization of the emitted light. The lenses have different numerical apertures.

Abstract: An optical scanner includes a light receiving unit, a reference light irradiating unit, and a light-receiving-side correcting unit. The light receiving unit includes an optical phased array that implements scanning by a light beam by individually controlling phases of a plurality of branched lights using a scanning phase amount. The reference light irradiating unit generates reference light and irradiate the reference light onto the light receiving unit. The light-receiving-side correcting unit estimates a phase shift amount that occurs in the plurality of branched lights as a result of distortion of a substrate on which the light receiving unit is mounted from a detection result of the light receiving unit onto which the reference light is incident, and sets a phase adjustment amount to be applied to the plurality of branched lights such that the estimated phase shift amount decreases.

Abstract: An optical scanner includes a light source, an optical phased array, a monitoring light receiving unit, and a signal processing unit. The optical phased array implements scanning by a light beam by individually controlling phases of a plurality of branched lights into which light supplied from the light source is branched, using a scanning phase amount, and radiating light from an antenna array that has a plurality of antenna elements. The monitoring light receiving unit receives light radiated from the optical phased array. The signal processing unit detects characteristics of the light beam from a detection result of the monitoring light receiving unit and generate a phase adjustment amount for correcting the scanning phase amount such that a detection value of the characteristics coincides with a design value prepared in advance.

Abstract: A frequency sweep characteristic measurement device splits the laser light to generate a difference in lengths of optical paths and combines the split laser lights to generate a combined light. This device receives the combined light, converts the received light into a beat signal, and outputs the beat signal. Further, this device adjusts a waveform so that an amplitude and a phase match at both ends of the beat signal, calculates a quadrature component by performing a Hilbert transform on the beat signal whose waveform has been adjusted, and calculates an instantaneous phase of the beat signal by calculating an inverse tangent of the quadrature component and the beat signal whose waveform has been adjusted. This device calculates the frequency sweep characteristic of the laser light based on the instantaneous phase and the difference in the lengths of the optical paths.

Abstract: An optical deflector includes: a reflecting section driven to rotate or oscillate around a drive axis; and a diffraction section configured to diffract light reflected by the reflecting section. The reflecting section is driven to change a first incident angle of light, around the drive axis, incident on the diffraction section from the reflecting section. The diffraction section changes a first emission angle of light emitted from the diffraction section, around a first axis perpendicular to the drive axis and a predetermined direction defined to extend from the reflecting section toward the diffraction section perpendicularly to the drive axis. The diffraction section is driven about the drive axis together with the reflecting section to maintain a second incident angle of light incident on the diffraction section from the reflecting section, around the first axis.

Abstract: A laser radar device includes a transmission unit, a scanning unit, a distance calculation section, and a movement control unit. The transmission unit transmits laser light that has been subjected to frequency modulation. The scanning unit performs scanning with the laser light. For each of a plurality of partial regions obtained by dividing a laser light scanning region preset as a two-dimensional region which the scanning unit scans with the laser light, the distance calculation section receives the laser light that has been reflected by an object, and calculates a distance to the object in the partial region. The movement control unit controls movement of the laser light so that the laser light moves in the partial region, with ??>(1.22*?/d) being met.

Abstract: A light irradiation apparatus includes an optical window, a light source and an irradiation unit. The optical window is formed of a light-transmissive material. The light source is configured to emit irradiation light with linear polarization. The irradiation unit is configured to irradiate the irradiation light emitted from the light source toward a preset irradiation range through the optical window. Moreover, the optical window has a shape such that the reflectivity of the irradiation light within a specified range is lower than or equal to a preset upper limit; the specified range is provided within the irradiation range.

Abstract: A fine section setting unit of a laser radar device sets, for a beat signal waveform indicating time change of a beat signal amplitude of an up beat signal, a plurality of fine sections within time ranges of the beat signal waveform. A fine section extraction unit extracts at least one fine section satisfying a preset extraction condition indicating that the beat signal amplitude in the fine section is high, from among the set plurality of fine sections. A peak detection unit subjects the beat signal in the extracted fine section to frequency analysis to calculate a fine section frequency spectrum and detect a peak frequency, which is a peak in the fine section frequency spectrum.

Abstract: An optical scanner includes a light source, an optical phased array, a monitoring light receiving unit, and a signal processing unit. The optical phased array implements scanning by a light beam by individually controlling phases of a plurality of branched lights into which light supplied from the light source is branched, using a scanning phase amount, and radiating light from an antenna array that has a plurality of antenna elements. The monitoring light receiving unit receives light radiated from the optical phased array. The signal processing unit detects characteristics of the light beam from a detection result of the monitoring light receiving unit and generate a phase adjustment amount for correcting the scanning phase amount such that a detection value of the characteristics coincides with a design value prepared in advance.

Abstract: An optical scanner includes a light receiving unit, a reference light irradiating unit, and a light-receiving-side correcting unit. The light receiving unit includes an optical phased array that implements scanning by a light beam by individually controlling phases of a plurality of branched lights using a scanning phase amount. The reference light irradiating unit generates reference light and irradiate the reference light onto the light receiving unit. The light-receiving-side correcting unit estimates a phase shift amount that occurs in the plurality of branched lights as a result of distortion of a substrate on which the light receiving unit is mounted from a detection result of the light receiving unit onto which the reference light is incident, and sets a phase adjustment amount to be applied to the plurality of branched lights such that the estimated phase shift amount decreases.

Abstract: A light irradiation apparatus includes an optical window, a light source and an irradiation unit. The optical window is formed of a light-transmissive material. The light source is configured to emit irradiation light with linear polarization. The irradiation unit is configured to irradiate the irradiation light emitted from the light source toward a preset irradiation range through the optical window. Moreover, the optical window has a shape such that the reflectivity of the irradiation light within a specified range is lower than or equal to a preset upper limit; the specified range is provided within the irradiation range.

Abstract: A laser range finding apparatus includes a light emitting section that emits a laser light, a light receiving section that receives the reflected laser light from a detection object, the light receiving section including a plurality of photo detectors for respectively receiving a plurality of different transmission wavelength bands of the laser light, an identifying section that identifies each of the photo detectors each of whose output indicating signal waveforms of the received reflected laser light is not saturated as an unsaturated photo detector, and a distance calculating section that calculates a distance to the detection object based on a light detection timing at which the reflected laser light is received by the unsaturated photo detector.

Abstract: A laser range finding apparatus includes a light emitting section that emits a laser light, a light receiving section that receives the reflected laser light from a detection object, the light receiving section including a plurality of photo detectors for respectively receiving a plurality of different transmission wavelength bands of the laser light, an identifying section that identifies each of the photo detectors each of whose output indicating signal waveforms of the received reflected laser light is not saturated as an unsaturated photo detector, and a distance calculating section that calculates a distance to the detection object based on a light detection timing at which the reflected laser light is received by the unsaturated photo detector.

Abstract: An interference filter assembly includes a condenser lens, a collimating lens, an interference filter, and an imaging device, which are arranged in a direction of light travel. The collimating lens is spaced from the condenser lens by a predetermined distance that corresponds to one of a focal length of the condenser lens and a focal length of the collimating lens. The collimating lens is provided by a single lens and applies a collimated light toward the imaging device through the interference filter in the direction of light travel. The collimating lens has a first surface adjacent to the condenser lens and a second surface adjacent to the interference filter. The first surface is a curved surface that is convex toward the condenser lens and a circular hyperboloid. The second surface is a plane surface and outputs the collimated light to the interference filter.