Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Toppan Printing Co., Ltd.

Mitsubishi Electronics Corporation

Takayuki Yanagisawa

Yoshihito Hirano

Shuhei Yamamoto

Yasuharu Koyata

Takeshi Sakimura

Yojiro Watanabe

Shumpei Kameyama

Toshiyuki Ando

Kyosuke Kuramoto

Masaharu Imaki

Fumio Shohda

Kohei Sakai

Yukari Takada

Mitoru Yabe

Yoko Inoue

Tsutomu Nagatsuka

Kimio Asaka

Akira Nakamura

Masataka Suzuki

Masahiro Kawai

Hiroshi Aruga

Akira Shiga

Kiyohide Sakai

Mamoru Hamada

Yosuke Akino

Fumio Shoda

Kenichi Hirosawa

Hidenori Fukahori

Yusuke Ito

Noriyuki Miyamoto

Syuhei Yamamoto

Naoki Suzuki

Tetsuya Nishimura

Shusou Wadaka

Kazutaka Ikeda

Yoshihiro Matsumoto

Nobuki Kotake

Yuzo Nakano

Hiroki Goto

Masao Imaki

Eisuke Haraguchi

Kiyoshi Onohara

Takao Endo

Tomohiko Sawanaka

Tetsuo Funakura

Shinichi Oe

Yutaka Kajiyama

Satoi Kobayashi

Yosuke Tsuzaki

Yasuisa Ooga

Shoji Morita

Hisamichi Tanaka

Yasuhiro Hinokuma

Yuhi Kono

Fumihiko Kannari

Takuya Takasaki

Yu Sakai

Shigetaka Itakura

Takayasu Anada

Etsuo Sugimoto

Wataru Yoshiki

Mio Nishida

Narito Samejima

A laser radar device includes a first signal sequence converting unit that converts a transmission signal generated by a transmission signal generating unit into a first pulse signal sequence; a second signal sequence converting unit that converts a reception signal outputted from a reflected light receiving unit into a second pulse signal sequence; and a range calculating unit that calculates a range to a ranging target from a time difference between a time at which transmission light is irradiated by a light irradiating unit and a time at which reflected light is received by the reflected light receiving unit, and an acceptance or refusal selecting unit calculates a degree of match between the first pulse signal sequence and the second pulse signal sequence, and selects or discards the range calculated by the range calculating unit on the basis of the degree of match.

Laser radar device

A laser radar device includes: a light source for outputting laser light; a scanner for causing the laser light to scan; a first optical system for receiving the laser light caused to scan by the scanner and incident on the first optical system and emitting the incident laser light in such a manner that a horizontal component of the incident laser light is different from a horizontal component of the laser light to be emitted; and a second optical system for receiving the laser light caused to scan by the scanner and incident on the second optical system and emitting the incident laser light in such a manner that an incident area of the incident laser light in the horizontal direction is the same as an incident area of the first optical system in the horizontal direction, and an emission area of the incident laser light is different from an emission area of the first optical system.

An optical transmission unit () transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector () is provided on a path through which transmission light is transmitted from a circulator () to the atmosphere, and reflects the optical signal. A detection unit () performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector ().

To provide a laser distance measuring apparatus which can increase the measurement frequency per unit time by suppressing the increase in the data amount expressing the measurement time, while ensuring the distance measurement precision and the measurable distance. A laser distance measuring apparatus measures, with a time resolution, a light receiving time which is a time from a time point when the laser beam generating unit emits the laser beam to a time point when the light receiving unit outputs the light receiving signal; calculates an object distance which is a distance to the object, based on the measurement result of the light receiving time by the time measuring device; and changes the time resolution of the time measuring device used for calculation of the object distance, based on detection information.

Laser distance measuring apparatus

A laser radar device includes: a primary light source configured to combine laser beams having different wavelengths to generate primary light; an optical splitter configured to split the primary light into transmission light and reference light; an optical modulator configured to modulate the transmission light to generate modulated transmission light; an optical transmitter/receiver system configured to emit the modulated transmission light into an external space and receive light scattered or diffused by a target; an optical combiner configured to combine the reference light and the received light to generate an optical beat signal; and a photodetector circuit configured to perform an optical-to-electrical signal conversion of the optical beat signal to generate a received signal; and a signal processing circuit configured to calculate a measurement value related to the target on the basis of the received signal.

An optical pattern generation device includes: a first laser light source for emitting first laser light; a first diffractive optical element for changing a phase of the first laser light depending on a position on a plane perpendicular to a propagating direction of the first laser light, and emitting laser light having a phase distribution; a second diffractive optical element for changing a phase of incident laser light depending on a position on a plane perpendicular to a propagating direction of the incident laser light, and emitting laser light for forming an optical pattern; and a transfer optical system disposed between the first and second diffractive optical elements, for transferring the phase distribution of the laser light emitted from the first diffractive optical element to a phase distribution of laser light incident on the second diffractive optical element.

Optical pattern generation device

An optical distance measurement device includes: a photodetector including PDs for receiving interference light output from an optical interference unit and outputting detection signals of the interference light; and a switch for selecting one of the detection signals output from the PDs, in which a distance calculation unit calculates a distance to a measurement object on the basis of the detection signal selected by the switch.

Optical distance measurement device and processing device

The wavefront measurement device performs: generating a first pupil function at a reference wavelength based on input data of a wavefront aberration; calculating a first image plane amplitude at a reference wavelength based on the first pupil function; generating a second pupil function at a multi-wavelength region; calculating a second image plane amplitude at the multi-wavelength region based on the second pupil function; correcting a measured point spread function using the first and second image plane amplitudes; applying a constraint condition using the corrected point spread function to the first image plane amplitude to correct the first image plane amplitude; generating a third pupil function based on the corrected first image plane amplitude; and calculating a wavefront aberration on a pupil plane based on the third pupil function.

Wavefront measurement device and wavefront measurement system

A lens () has an incidence surface () having a cylindrical shape and forming a concave shape, and an emitting surface () forming a convex shape with respect to an optical axis (). A light source () 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 () is located at a position of focal length of the lens () in the vertical direction on a side of the incidence surface. The horizontal direction of the light source () is aligned with a curvature direction of the cylindrical shape of the lens ().

Collimated light generating apparatus

A problem with a conventional waveguide type laser device is that in the case in which an isotropic laser medium is used for a core, linearly polarized light is not provided. A ridge waveguide laser device of the present disclosure includes: a substrate; a core joined to the substrate and having a laser medium, the core having a refractive index higher than that of the substrate; and a cladding joined to the core, constituting a ridge waveguide together with the core, and made from a birefringent material having ordinary and extraordinary refractive indices lower than the refractive index of the core, the ordinary and extraordinary refractive indices being different.

Ridge waveguide laser device

In a planar waveguide laser device (), a substrate () is joined to the upper surface of a waveguide (). A recess () having a chamfered shape is formed along an edge of an end facet of the substrate () on the side of the waveguide (), the end facet being perpendicular to the direction of laser oscillation. An end facet of the waveguide () perpendicular to the oscillation direction of laser light is covered with a coating (). A wraparound portion () continuing from the coating () covers the upper surface of the waveguide () facing the recess () of the substrate ().

Planar waveguide laser device

Disclosed is a planar waveguide including: a core () which is a flat plate through which light propagates; a cladding () which is a flat plate for reflecting the light in a state of being joined to an upper surface of the core (); and a cladding () which is a flat plate for reflecting the light in a state of being joined to a lower surface of the core (), in which each of the claddings () and () 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 (), and the limit on materials usable as the material of the core () is relaxed.

Planar waveguide

Disclosed is a laser light transceiver which is configured so as to include a polarization changing unitfor outputting a laser light beam outputted from a transmission light sourcetoward a direction corresponding to the polarization of the laser light beam while changing the polarization of the laser light beam with respect to time. As a result, the laser light transceiver can transmit a laser light beam, whose power is not decreased, in two eye directions without mechanically scanning with the laser light beam.

There are provided: a planar waveguide in which claddings () and () each having a smaller refractive index than a laser medium for absorbing pump light () are bonded to an upper surface () and a lower surface () of a core () which is formed from the laser medium; pump light generation sources () and () for emitting pump light () to side surfaces () and () of the core (); and laser light high reflection films () and () formed on side surfaces () and () of the core (). Each of side surfaces () and () of the cladding () corresponding to the side surfaces () and () of the core () has a ridge structure () in which a part thereof is recessed.

Planar waveguide laser apparatus

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.

Array type wavelength converting laser device

Growing community of inventors

Tokyo, Japan

Takayuki Yanagisawa