Patents by Inventor Shigehiro Nagano
Shigehiro Nagano 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: 10663656Abstract: An embodiment of the invention relates to an optical device which is capable of realizing a secondary nonlinear optical phenomenon. The optical device is a fiber-type optical device which is comprised of glass containing SiO2, and includes a core region, a first cladding region, and a second cladding region. At least a part of a glass region configured by the core region and the first cladding region has such a repetition structure that a first section serving as a poled crystal region and a second section serving as an amorphous region are alternately disposed along a longitudinal direction of the optical device.Type: GrantFiled: June 21, 2018Date of Patent: May 26, 2020Assignee: Sumitomo Electric Industries, Ltd.Inventor: Shigehiro Nagano
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Patent number: 10605982Abstract: The present embodiment relates to an MCF and the like suitable for fabricating an FBG with improved ripple characteristics. The MCF is mainly composed of silica glass, and comprises a plurality of light guiding structures and a common cladding. Each of the light guiding structures includes a core, a first cladding, and a second cladding. The refractive index of the second cladding is higher than that of the first cladding and is lower than those of the core and the common cladding. Further, at least a part of an inner cladding region, constituted by the first cladding and the second cladding, contains a photosensitive material having photosensitivity of changing a refractive index of a glass region containing the photosensitive material in response to irradiation of light with a specific wavelength.Type: GrantFiled: October 5, 2018Date of Patent: March 31, 2020Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Shigehiro Nagano
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Publication number: 20190317380Abstract: The present embodiment relates to an optical device or the like that is high in non-linearity and resistance to UV light and includes a structure allowing stable wavelength conversion. The optical device is comprised of glass containing SiO2 and comprises a repetitive structure including first sections being crystallized regions in which a radial polarization-ordered structure is formed and second sections being non-crystallized regions alternately arranged along a center axis extending from a center of a light-incidence end face toward a center of a light-emission end face.Type: ApplicationFiled: June 25, 2019Publication date: October 17, 2019Applicant: Sumitomo Electric Industries, Ltd.Inventors: Shigehiro NAGANO, Masato SUZUKI, Masato TANAKA, Manabu SHIOZAKI, Hiroo KANAMORI
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Publication number: 20190207358Abstract: The present embodiment relates to an optical amplifier and the like having a structure for enabling efficient use of pumping light while avoiding complication of a device structure. In such an optical amplifier, since pumping light from a pumping light source is supplied to each core of an amplification MCF, a coupling MCF in which adjacent cores form a coupled core is arranged between the amplification MCF and the pumping light source. The pumping light source is optically connected to a specific core of the coupling MCF, and pumping light is coupled from the specific core to remaining cores except the specific core in the coupling MCF before pumping light is supplied to each core of the amplification MCF. This enables coupling of pumping light between optically connected cores between the amplification MCF and the coupling MCF.Type: ApplicationFiled: March 6, 2019Publication date: July 4, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Takemi HASEGAWA, Tetsuya HAYASHI, Yoshiaki TAMURA, Hirotaka SAKUMA, Shigehiro NAGANO
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Publication number: 20190154912Abstract: An optical fiber is made of silica-based glass and includes a core, a first cladding that surrounds the core and that has a refractive index lower than a refractive index of the core; and a second cladding that surrounds the first cladding and that has a refractive index lower than the refractive index of the core and higher than the refractive index of the first cladding. At least a part of the first cladding contains a photosensitive material whose refractive index increases by irradiation with light having a specific wavelength. A difference ?n between a refractive index of a portion of the first cladding, the portion being nearest to the core, and the refractive index of the core is in a range of 0.25% to 0.30%. The radius ra of the core is larger than 4.3 ?m and smaller than or equal to 5.0 ?m.Type: ApplicationFiled: November 16, 2018Publication date: May 23, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Shigehiro NAGANO, Manabu SHIOZAKI, Jun KINUGASA, Takemi HASEGAWA
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Publication number: 20190041575Abstract: The present embodiment relates to an MCF and the like suitable for fabricating an FBG with improved ripple characteristics. The MCF is mainly composed of silica glass, and comprises a plurality of light guiding structures and a common cladding. Each of the light guiding structures includes a core, a first cladding, and a second cladding. The refractive index of the second cladding is higher than that of the first cladding and is lower than those of the core and the common cladding. Further, at least a part of an inner cladding region, constituted by the first cladding and the second cladding, contains a photosensitive material having photosensitivity of changing a refractive index of a glass region containing the photosensitive material in response to irradiation of light with a specific wavelength.Type: ApplicationFiled: October 5, 2018Publication date: February 7, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Shigehiro Nagano
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Publication number: 20180299616Abstract: An embodiment of the invention relates to an optical device which is capable of realizing a secondary nonlinear optical phenomenon. The optical device is a fiber-type optical device which is comprised of glass containing SiO2, and includes a core region, a first cladding region, and a second cladding region. At least a part of a glass region configured by the core region and the first cladding region has such a repetition structure that a first section serving as a poled crystal region and a second section serving as an amorphous region are alternately disposed along a longitudinal direction of the optical device.Type: ApplicationFiled: June 21, 2018Publication date: October 18, 2018Inventor: Shigehiro Nagano
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Publication number: 20170115449Abstract: Provided are an apparatus for manufacturing a grating and a method for manufacturing a grating with which a grating having a desired attenuate wavelength characteristic can be easily manufactured. The apparatus, which forms a grating in an optical fiber as an optical waveguide, includes a laser source, beam diameter adjusting means, a scanning mirror, mirror position adjusting means, a cylindrical lens, lens position adjusting means, a phase mask, mask position adjusting means, a stage, a fixing jig, and a synchronous controller. The synchronous controller controls an adjustment of a position of the scanning mirror performed by the mirror position adjusting means and an adjustment of a position of the phase mask performed by the mask position adjusting means in a manner in which they are associated with each other.Type: ApplicationFiled: April 7, 2015Publication date: April 27, 2017Applicant: Sumitomo Electric Industries, Ltd.Inventor: Shigehiro NAGANO
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Patent number: 9395550Abstract: The present invention relates to a laser light source which reduces wavelength-dependent difference of focal position of condensed light when multicolor light with a wide spectral width is collimated and then condensed. The laser light source incorporates a collimator device, in which an installation position of a collimating lens with respect to a laser light entrance portion is set so that a beam waist position of laser light having passed through the collimating lens shifts closer to the collimating lens with a shorter-wavelength-side wavelength component out of wavelength components included in the laser light.Type: GrantFiled: August 28, 2013Date of Patent: July 19, 2016Assignee: Sumitomo Electric Industries, Ltd.Inventor: Shigehiro Nagano
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Publication number: 20160167166Abstract: There is provided a laser processing method using a laser processing apparatus including a laser beam source for outputting a laser beam including a plurality of wavelength components, a collimating lens for receiving the laser beam, and a focusing lens for receiving the laser beam collimated by the collimating lens, the laser processing method including the step of: irradiating a material to be processed with the laser beam focused by the focusing lens in the laser processing apparatus. In the step of irradiating the material to be processed with the laser beam, positions of the collimating lens and the focusing lens are adjusted, and a wavefront shape of the laser beam received by the focusing lens is adjusted, thereby adjusting a size of a focusing area constituted by a plurality of focuses corresponding to the plurality of wavelength components of the laser beam focused by the focusing lens.Type: ApplicationFiled: October 1, 2013Publication date: June 16, 2016Inventors: Shigehiro NAGANO, Motoki KAKUI, Yasuhiro OKAMOTO, Akira OKADA
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Publication number: 20160109650Abstract: An optical fiber having a composition that is most suitable from the viewpoint of filter formation time and filter properties of slanted fiber grating (SFG) is provided. An optical fiber made of silica-based glass comprises a core region, which does not contain GeO2 and includes the optical axis, and a cladding region formed around the core region. The cladding region has a refractive index smaller than that of the core region and contains GeO2 of 6.8 wt % or more. SFG made with the optical fiber enables base loss of 2 dB or less, peak wavelength shift of 1.2 nm or less, and change of 0.2 nm or less in width at half maximum.Type: ApplicationFiled: October 7, 2015Publication date: April 21, 2016Inventors: Takuji NAGASHIMA, Shigehiro NAGANO
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Patent number: 9225138Abstract: The present invention relates to a laser light source capable of suppressing variation in propagation state of randomly-polarized laser light. In the laser light source, an isolator including a Faraday rotation crystal having a positive thermooptic constant, and a nonlinear optical crystal having a negative thermooptic constant are arranged in order along a traveling direction of laser light. The nonlinear optical crystal is arranged in a state off normal incidence of incident light so that a propagation axis of light propagating in the crystal is parallel to an optic axis of the crystal.Type: GrantFiled: August 23, 2013Date of Patent: December 29, 2015Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shigehiro Nagano, Motoki Kakui, Hiroshi Kohda, Shinobu Tamaoki, Yasuomi Kaneuchi
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Publication number: 20150229094Abstract: The present invention relates to a laser light source capable of suppressing variation in propagation state of randomly-polarized laser light. In the laser light source, an isolator including a Faraday rotation crystal having a positive thermooptic constant, and a nonlinear optical crystal having a negative thermooptic constant are arranged in order along a traveling direction of laser light. The nonlinear optical crystal is arranged in a state off normal incidence of incident light so that a propagation axis of light propagating in the crystal is parallel to an optic axis of the crystal.Type: ApplicationFiled: August 23, 2013Publication date: August 13, 2015Inventors: Shigehiro Nagano, Motoki Kakui, Hiroshi Kohda, Shinobu Tamaoki, Yasuomi Kaneuchi
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Publication number: 20150185492Abstract: The present invention relates to a laser light source which reduces wavelength-dependent difference of focal position of condensed light when multicolor light with a wide spectral width is collimated and then condensed. The laser light source incorporates a collimator device, in which an installation position of a collimating lens with respect to a laser light entrance portion is set so that a beam waist position of laser light having passed through the collimating lens shifts closer to the collimating lens with a shorter-wavelength-side wavelength component out of wavelength components included in the laser light.Type: ApplicationFiled: August 28, 2013Publication date: July 2, 2015Inventor: Shigehiro Nagano
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Patent number: 8933367Abstract: There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.Type: GrantFiled: February 8, 2012Date of Patent: January 13, 2015Assignees: Sumitomo Electric Industries, Ltd., National University Corporation Okayama UniversityInventors: Motoki Kakui, Hiroshi Kohda, Yasuomi Kaneuchi, Shinobu Tamaoki, Shigehiro Nagano, Yoshiyuki Uno, Yasuhiro Okamoto, Kenta Takahashi
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Patent number: 8854737Abstract: The present invention relates to a laser light source and others for decreasing wavelength-by-wavelength differences of focal positions of focused components in collimating and then focusing polychromatic light with a wide spectrum width. The laser light source includes a collimator device, in which relative positions of emergence of a laser beam emitted from a polychromatic light source and a collimating lens composed of an achromatic lens can be adjusted at a 10 ?m level or less.Type: GrantFiled: August 31, 2012Date of Patent: October 7, 2014Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shigehiro Nagano, Motoki Kakui
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Publication number: 20130050838Abstract: The present invention relates to a laser light source and others for decreasing wavelength-by-wavelength differences of focal positions of focused components in collimating and then focusing polychromatic light with a wide spectrum width. The laser light source includes a collimator device, in which relative positions of emergence of a laser beam emitted from a polychromatic light source and a collimating lens composed of an achromatic lens can be adjusted at a 10 ?m level or less.Type: ApplicationFiled: August 31, 2012Publication date: February 28, 2013Applicant: Sumitomo Electric Industries, Ltd.Inventors: Shigehiro NAGANO, Motoki Kakui
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Publication number: 20120255935Abstract: There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.Type: ApplicationFiled: February 8, 2012Publication date: October 11, 2012Applicants: National University Corporation Okayama University, Sumitomo Electric Industries, Ltd.Inventors: Motoki KAKUI, Hiroshi Kohda, Yasuomi Kaneuchi, Shinobu Tamaoki, Shigehiro Nagano, Yoshiyuki Uno, Yasuhiro Okamoto, Kenta Takahashi
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Patent number: 8173982Abstract: A non-degenerate polarization-entangled photon pair generation device (1) that efficiently and easily generates non-degenerate polarization-entangled photon pairs includes: a quantum-entangled photon pair generator (2) including a single crystal in which periodically poled structures (3a, 3b) having different periods are formed; and a light radiating unit (4) for entering light into the quantum-entangled photon pair generator (2) such that the light passes through the periodically poled structure (3a) and then through the periodically poled structure (3b).Type: GrantFiled: December 10, 2008Date of Patent: May 8, 2012Assignee: Japan Science and Technology AgencyInventors: Keiichi Edamatsu, Ryosuke Shimizu, Shigehiro Nagano
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Publication number: 20110315901Abstract: A non-degenerate polarization-entangled photon pair generation device (1) that efficiently and easily generates non-degenerate polarization-entangled photon pairs includes: a quantum-entangled photon pair generator (2) including a single crystal in which periodically poled structures (3a, 3b) having different periods are formed; and a light radiating unit (4) for entering light into the quantum-entangled photon pair generator (2) such that the light passes through the periodically poled structure (3a) and then through the periodically poled structure (3b).Type: ApplicationFiled: December 10, 2008Publication date: December 29, 2011Inventors: Keiichi Edamatsu, Ryosuke Shimizu, Shigehiro Nagano