Patents by Inventor Takeshi Sakimura
Takeshi Sakimura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10353054Abstract: Disclosed is a laser light transceiver which is configured so as to include a polarization changing unit 2 for outputting a laser light beam outputted from a transmission light source 1 toward 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.Type: GrantFiled: August 12, 2014Date of Patent: July 16, 2019Assignee: Mitsubishi Electric CorporationInventors: Yasuhiro Hinokuma, Takeshi Sakimura, Yosuke Akino, Takayuki Yanagisawa, Hisamichi Tanaka
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Patent number: 10116113Abstract: There are provided: a planar waveguide in which claddings (2) and (3) each having a smaller refractive index than a laser medium for absorbing pump light (5) are bonded to an upper surface (1a) and a lower surface (1b) of a core (1) which is formed from the laser medium; pump light generation sources (4a) and (4b) for emitting pump light (5) to side surfaces (1c) and (1d) of the core (1); and laser light high reflection films (6a) and (6b) formed on side surfaces (1e) and (1f) of the core (1). Each of side surfaces (2e) and (2f) of the cladding (2) corresponding to the side surfaces (1e) and (1f) of the core (1) has a ridge structure (20) in which a part thereof is recessed.Type: GrantFiled: August 7, 2015Date of Patent: October 30, 2018Assignee: Mitsubishi Electric CorporationInventors: Takeshi Sakimura, Yuhi Kono, Kohei Sakai, Yukari Takada, Yojiro Watanabe, Fumio Shoda, Takayuki Yanagisawa
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Publication number: 20180198250Abstract: There are provided: a planar waveguide in which claddings (2) and (3) each having a smaller refractive index than a laser medium for absorbing pump light (5) are bonded to an upper surface (1a) and a lower surface (1b) of a core (1) which is formed from the laser medium; pump light generation sources (4a) and (4b) for emitting pump light (5) to side surfaces (1c) and (1d) of the core (1); and laser light high reflection films (6a) and (6b) formed on side surfaces (1e) and (1f) of the core (1). Each of side surfaces (2e) and (2f) of the cladding (2) corresponding to the side surfaces (1e) and (1f) of the core (1) has a ridge structure (20) in which a part thereof is recessed.Type: ApplicationFiled: August 7, 2015Publication date: July 12, 2018Applicant: Mitsubishi Electric CorporationInventors: Takeshi SAKIMURA, Yuhi KONO, Kohei SAKAI, Yukari TAKADA, Yojiro WATANABE, Fumio SHODA, Takayuki YANAGISAWA
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Patent number: 9825424Abstract: An object is to provide an optical device capable of relaxing a manufacturing condition for an optical waveguide used in the optical device. An optical device 500 is provided with an optical waveguide 200 including a core and a cladding optically joined together, and a temperature controller 600 that controls temperature of the optical waveguide, wherein the optical waveguide includes the core and the cladding formed such that a normalized frequency specified for light propagating through the optical waveguide changes across a cutoff frequency of a guided mode determined from a structure of the optical waveguide in a temperature range in which a refractive index of the core is higher than a refractive index of the clad. The temperature controller controls the temperature of the optical waveguide over a temperature range across temperature at which the normalized frequency equals to the cutoff frequency.Type: GrantFiled: January 9, 2015Date of Patent: November 21, 2017Assignee: Mitsubishi Electric CorporationInventors: Yojiro Watanabe, Takeshi Sakimura, Takayuki Yanagisawa
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Patent number: 9780519Abstract: A configuration is provided with a laser medium 1 of a refractive index nc that is an isotropic medium and includes an upper surface and a lower surface, where at least one of the upper surface and the lower surface is bonded with a cladding 2 having a refractive index satisfying a relationship of no<nc<ne or ne<nc<no. This allows selective output of only polarized light generated by a refractive index in the cladding 2 smaller than the refractive index nc at a desired wavelength (e.g. 1535 nm) which can be implemented by using the isotropic medium.Type: GrantFiled: December 27, 2013Date of Patent: October 3, 2017Assignee: Mitsubishi Electric CorporationInventors: Yojiro Watanabe, Takeshi Sakimura, Takayuki Yanagisawa
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Publication number: 20170242100Abstract: Disclosed is a laser light transceiver which is configured so as to include a polarization changing unit 2 for outputting a laser light beam outputted from a transmission light source 1 toward 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.Type: ApplicationFiled: August 12, 2014Publication date: August 24, 2017Applicant: Mitsubishi Electric CorporationInventors: Yasuhiro HINOKUMA, Takeshi SAKIMURA, Yosuke AKINO, Takayuki YANAGISAWA, Hisamichi TANAKA
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Patent number: 9698556Abstract: Plural signal beams enter a planar waveguide laser amplifier from different directions to follow different paths therein, which reduces a region not contributing to amplification where no signal beam passes. Plural signal beams follow different paths in the planar waveguide, and a second signal beam utilizes the gain of a portion of the planar waveguide that a first signal beam cannot utilize. By this configuration, a region not contributing to amplification of the signal beams in the planar waveguide laser amplifier can be reduced, causing to efficiently amplify plural signal beams.Type: GrantFiled: May 14, 2014Date of Patent: July 4, 2017Assignee: Mitsubishi Electric CorporationInventors: Takuya Takasaki, Yojiro Watanabe, Takeshi Sakimura, Takayuki Yanagisawa
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Publication number: 20170047706Abstract: An object is to provide an optical device capable of relaxing a manufacturing condition for an optical waveguide used in the optical device. An optical device 500 is provided with an optical waveguide 200 including a core and a cladding optically joined together, and a temperature controller 600 that controls temperature of the optical waveguide, wherein the optical waveguide includes the core and the cladding formed such that a normalized frequency specified for light propagating through the optical waveguide changes across a cutoff frequency of a guided mode determined from a structure of the optical waveguide in a temperature range in which a refractive index of the core is higher than a refractive index of the clad. The temperature controller controls the temperature of the optical waveguide over a temperature range across temperature at which the normalized frequency equals to the cutoff frequency.Type: ApplicationFiled: January 9, 2015Publication date: February 16, 2017Applicant: Mitsubishi Electric CorporationInventors: Yojiro WATANABE, Takeshi SAKIMURA, Takayuki YANAGISAWA
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Publication number: 20160301179Abstract: A configuration is provided with a laser medium 1 of a refractive index nc that is an isotropic medium and includes an upper surface and a lower surface, where at least one of the upper surface and the lower surface is bonded with a cladding 2 having a refractive index satisfying a relationship of no<nc<ne or ne<nc<no. This allows selective output of only polarized light generated by a refractive index in the cladding 2 smaller than the refractive index nc at a desired wavelength (e.g. 1535 nm) which can be implemented by using the isotropic medium.Type: ApplicationFiled: December 27, 2013Publication date: October 13, 2016Applicant: Mitsubishi Electric CorporationInventors: Yojiro WATANABE, Takeshi SAKIMURA, Takayuki YANAGISAWA
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Publication number: 20160291137Abstract: Disclosed is a laser radar device including optical branching couplers each of that branches a laser light oscillated, optical modulators each of that modulates a laser light after being branched, an optical combining coupler that combines laser lights modulated by the optical modulators, an optical combining coupler that combines other laser lights after being branched, an optical system that emits a composite light from the optical combining coupler, and receives lights scattered by a target, an optical combining coupler that combines the scattered lights and a composite light from the optical combining coupler, an optical detector that detects beat signals from a composite light from the optical combining coupler, a signal processing unit that extracts information about the target from the beat signals, and a diffraction grating that emits a light incident thereupon toward a specific direction according to the angle and the frequency of the incident light.Type: ApplicationFiled: May 23, 2014Publication date: October 6, 2016Applicant: Mitsubishi Electric CorporationInventors: Takeshi SAKIMURA, Takayuki YANAGISAWA, Yoshichika MIWA
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Publication number: 20160197450Abstract: Plural signal beams enter a planar waveguide laser amplifier from different directions to follow different paths therein, which reduces a region not contributing to amplification where no signal beam passes. Plural signal beams follow different paths in the planar waveguide, and a second signal beam utilizes the gain of a portion of the planar waveguide that a first signal beam cannot utilize. By this configuration, a region not contributing to amplification of the signal beams in the planar waveguide laser amplifier can be reduced, causing to efficiently amplify plural signal beams.Type: ApplicationFiled: May 14, 2014Publication date: July 7, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Takuya TAKASAKI, Yojiro WATANABE, Takeshi SAKIMURA, Takayuki YANAGISAWA
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Patent number: 9310487Abstract: A lidar includes CW laser light sources that oscillate CW laser light rays with wavelengths different from each other; an optical multiplexing coupler that mixes the CW laser light rays oscillated by the CW laser light sources; an optical branching coupler that splits the CW laser light passing through the mixing by the optical multiplexing coupler; a light modulator that modulates first CW laser light split by the optical branching coupler; and an optical fiber amplifier that amplifies the laser light modulated by the light modulator, in which a transmit-receive optical system irradiates a target with the laser light amplified by the optical fiber amplifier, and receives scattered light of the laser light by the target.Type: GrantFiled: December 7, 2012Date of Patent: April 12, 2016Assignee: Mitsubishi Electric CorporationInventors: Takeshi Sakimura, Takayuki Yanagisawa, Shumpei Kameyama, Toshiyuki Ando, Yoshihito Hirano
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Publication number: 20140233013Abstract: A lidar includes CW laser light sources that oscillate CW laser light rays with wavelengths different from each other; an optical multiplexing coupler that mixes the CW laser light rays oscillated by the CW laser light sources; an optical branching coupler that splits the CW laser light passing through the mixing by the optical multiplexing coupler; a light modulator that modulates first CW laser light split by the optical branching coupler; and an optical fiber amplifier that amplifies the laser light modulated by the light modulator, in which a transmit-receive optical system irradiates a target with the laser light amplified by the optical fiber amplifier, and receives scattered light of the laser light by the target.Type: ApplicationFiled: December 7, 2012Publication date: August 21, 2014Applicant: Mitsubishi Electric CorporationInventors: Takeshi Sakimura, Takayuki Yanagisawa, Shumpei Kameyama, Toshiyuki Ando, Yoshihito Hirano