Patents by Inventor Motonobu Kourogi
Motonobu Kourogi 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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Publication number: 20240219802Abstract: A purpose of the present invention is to provide an optical frequency comb generator control device capable of obtaining a stable output by performing a control of a resonator length or a light source frequency such that a control point is located at a position where an optical frequency comb is generated most widely, even in an optical frequency comb generator in which a modulation frequency is switched, or even when a generation method of an optical frequency comb is not a complete single mode.Type: ApplicationFiled: October 18, 2021Publication date: July 4, 2024Inventors: Motonobu Kourogi, Kazuhiro Imai
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Publication number: 20240192365Abstract: A purpose of the present invention is to provide an optical comb generation device capable of obtaining an absolute distance result with high accuracy by reducing a phase offset by a signal transmission path of an object other than an object to be measured, for example in an optical comb distance meter for measuring a distance from a time difference between an interference signal of a measuring light and an interference signal of a reference light. A drive control unit controls to output M (M is an integer of two or more) types of optical combs with mutually different modulation frequencies in which N (N is an integer of three or more) types of modulation frequencies are switched cyclically, by respectively modulating a phase or an intensity periodically, from M optical comb generators, by supplying driving signals to the M optical comb generators comprised in an optical comb generation unit.Type: ApplicationFiled: December 2, 2021Publication date: June 13, 2024Inventors: Kazuhiro Imai, Motonobu Kourogi
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Publication number: 20240126137Abstract: A purpose of the present invention is to provide a low relative phase noise optical comb generation device in which a repetitive frequency of an interference signal of an optical comb is stabilized by reducing a relative phase noise of driving signals with different frequencies for driving multiple optical comb generators in an optical comb distance meter.Type: ApplicationFiled: December 21, 2021Publication date: April 18, 2024Inventors: Kazuhiro Imai, Motonobu Kourogi
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Publication number: 20240085759Abstract: By inputting a modulation signal from a synthesizer circuit 11 to a switching circuit 13 via isolator elements 12A, 12B by inserting the isolator elements 12A, 12B between the synthesizer circuit 11 and the switching circuit 13, an operation of the synthesizer circuit 11 is prevented from being unstable with a load fluctuation by an opening or a short-circuit of circuits after the switching circuit, so an operation of the synthesizer circuit 11 will not be unstable by a load fluctuation when switching driving signals supplied to optical comb generators 14A, 14B by the switching circuit 13, and a driving state is transited by switching the driving signals of the optical comb generators 14A, 14B rapidly.Type: ApplicationFiled: August 30, 2021Publication date: March 14, 2024Inventors: Kazuhiro Imai, Motonobu Kourogi
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Patent number: 11726254Abstract: The present disclosure describes an optical waveguide provided with an incident side reflection film and an emission side reflection film to resonate light incident via the incident side reflection film and formed to penetrate from the incident side reflection film to the emission side reflection film for propagating resonated light. The disclosure also includes a substrate to which the optical waveguide is formed from a top surface thereof and a first protection member and a second protection member formed with a material corresponding to a material of the substrate, wherein the first protection member and the second protection member are arranged on the optical waveguide such that one end facet of the first protection member forms an identical plane with a first end facet of the substrate including an optical incident end.Type: GrantFiled: December 9, 2020Date of Patent: August 15, 2023Assignee: XTIA LTDInventors: Kazuhiro Imai, Motonobu Kourogi, Mark Jablonski
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Publication number: 20230016963Abstract: The present disclosure describes an optical waveguide provided with an incident side reflection film and an emission side reflection film to resonate light incident via the incident side reflection film and formed to penetrate from the incident side reflection film to the emission side reflection film for propagating resonated light. The disclosure also includes a substrate to which the optical waveguide is formed from a top surface thereof and a first protection member and a second protection member formed with a material corresponding to a material of the substrate, wherein the first protection member and the second protection member are arranged on the optical waveguide such that one end facet of the first protection member forms an identical plane with a first end facet of the substrate including an optical incident end.Type: ApplicationFiled: December 9, 2020Publication date: January 19, 2023Inventors: Kazuhiro Imai, Motonobu Kourogi, Mark Jablonski
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Patent number: 7712977Abstract: An optical resonator includes a waveguide (12) formed by using an incidence side reflection film (93) and an emission side reflection film (94) arranged in parallel with each other and adapted to resonate light entering it by way of the incidence side reflection film (93) and adapted to propagate light formed and resonated so as to run through from the incidence side reflection (93) to the emission side reflection film (94), a substrate (11) for forming the optical waveguide (12) on the top surface thereof and a first protection member (86) and a second protection member (87) corresponding to the material of the substrate (11) provided at an upper part of the waveguide (12) so as to make at least an end facet of each of the members form a plane (91) or (92) identical with the first end facet (84) or the second end facet (85), whichever appropriate, of the substrate (11) including the light incidence end or the light emission end, whichever appropriate, of the optical waveguide (11) and the incidence side reflType: GrantFiled: April 14, 2005Date of Patent: May 11, 2010Assignee: Optical Comb Institute, Inc.Inventors: Motonobu Kourogi, Kazuhiro Imai, Widiyatmoko Bambang
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Publication number: 20100097614Abstract: An optical coherence tomography device includes a wavelength scanning laser light source (10) provided with two Fabry-Perot resonators (13A, 13B) provided in a light path for laser oscillation. The values of FSR (free spectral range) of the Fabry-Perot resonators are set so as to be proximate to each other. The resonator length of at least one of the two Fabry-Perot resonators is periodically varied within a preset range to cause the two Fabry-Perot resonators (13A, 13B) to operate as a wavelength length varying filter of a narrow pass band capable of varying the selection wavelength by the vernier effect to output laser light that has wavelength temporally scanned.Type: ApplicationFiled: September 3, 2007Publication date: April 22, 2010Applicant: OPTICAL COMB, INC.Inventors: Motonobu Kourogi, Kazuhiro Imai
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Patent number: 7586085Abstract: The broad range measurement exploiting the usual propagated light and the high resolution measurement mode exploiting near-field light are to be accomplished with a sole as-assembled optical probe. To this end, light radiated through an optical probe 13 having a light shielding coating layer 33 formed for defining a light radiating aperture D or light radiated at a core 31 of the optical probe 13 is propagated, as the optical probe 13 is moved in a direction towards and away from a surface for measurement 2a. The core of the optical probe is coated with a light shielding coating layer 33. In this manner, a spot of propagated light propagated through the core 31 or a spot of near-field light seeping from the light radiating aperture D is formed on the surface for measurement 2a, and light derived from the spot of light is detected.Type: GrantFiled: July 8, 2004Date of Patent: September 8, 2009Assignees: Kanagawa Academy of Science and Technology, Hoden Seimitsu Kakokenkyusho Co., Ltd., Ricoh Company, Ltd.Inventors: Motoichi Ohtsu, Motonobu Kourogi, Shuji Mononobe, Takashi Yatsui, Koji Yamamoto, Toshiyuki Inokuchi, Masato Takada
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Patent number: 7586084Abstract: An optical detection device image is disclosed that allows fast measurements using near-field light at high resolution and high efficiency but without necessity of position alignment of an optical fiber probe. The optical detection device includes an optical fiber probe having a core for propagating light with an optical probe being formed at a front end of the core; a movement control unit to move the optical fiber probe to approach or depart from a sample; and a detection unit to detect light from the sample surface, wherein on the front end surface of the core of the optical probe, there are a first exit section on a peripheral side for emitting propagating light and a second exit section for seeping out the near-field light, the first exit section and the second exit section are formed in a concentric manner, and the tilt angle of the first exit section is different from the tilt angle of the second exit section.Type: GrantFiled: February 2, 2006Date of Patent: September 8, 2009Assignees: Ricoh Company, Ltd., Kanagawa Academy of Science and TechnologyInventors: Izumi Itoh, Masato Takada, Taroh Terashi, Motoichi Ohtsu, Takashi Yatsui, Motonobu Kourogi
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Patent number: 7551342Abstract: A resonance system (14, 15) is formed by a light incident side reflection mirror and a light exiting side reflecting mirror, arranged parallel to each other. The light incident on an incident side reflective mirror (14) is propagated in the outward path direction or in the backward path direction so that the light is set in a resonant state. The light in the resonant state in the resonance system (14, 15) is phase-modulated, responsive to a modulating signal supplied from an oscillating device (16) by a light modulation device (2) arranged between the light incident side reflective mirror (14) and the light exiting side reflective mirror (15). The oscillating device oscillates the modulating signal of a frequency fm.Type: GrantFiled: November 4, 2004Date of Patent: June 23, 2009Assignee: Optical Comb Institute, Inc.Inventors: Motonobu Kourogi, Kazuhiro Imai, Widiyatmoko Bambang
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Patent number: 7489616Abstract: An optical-pickup slider is characterized in that a light-transmitting-property substrate is bonded to a surface of a layer having a tapered through hole, on which surface a larger opening of the tapered through hole exists. Thereby, it is possible to prevent the layer having an aperture from being destroyed. A method of manufacturing the optical-pickup slider comprises the steps of a) making a tapered through hole in a layer layered on a first substrate and having a thickness smaller than that of the first substrate; and, after bonding a light-transmitting-property substrate to a surface of the layer, removing the first substrate so as to expose an aperture at a tip of the tapered through hole.Type: GrantFiled: December 6, 2005Date of Patent: February 10, 2009Assignee: Ricoh Company, Ltd.Inventors: Junichi Takahashi, Motonobu Kourogi, Takashi Yatsui, Motoichi Ohtsu
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Publication number: 20080073518Abstract: An optical detection device image is disclosed that allows fast measurements using near-field light at high resolution and high efficiency but without necessity of position alignment of an optical fiber probe. The optical detection device includes an optical fiber probe having a core for propagating light with an optical probe being formed at a front end of the core; a movement control unit to move the optical fiber probe to approach or depart from a sample; and a detection unit to detect light from the sample surface, wherein on the front end surface of the core of the optical probe, there are a first exit section on a peripheral side for emitting propagating light and a second exit section for seeping out the near-field light, the first exit section and the second exit section are formed in a concentric manner, and the tilt angle of the first exit section is different from the tilt angle of the second exit section.Type: ApplicationFiled: February 2, 2006Publication date: March 27, 2008Inventors: Izumi Itoh, Masato Takada, Taroh Terashi, Motoichi Ohtsu, Takashi Yatsui, Motonobu Kourogi
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Publication number: 20070292069Abstract: An optical resonator includes a waveguide (12) formed by using an incidence side reflection film (93) and an emission side reflection film (94) arranged in parallel with each other and adapted to resonate light entering it by way of the incidence side reflection film (93) and adapted to propagate light formed and resonated so as to run through from the incidence side reflection (93) to the emission side reflection film (94), a substrate (11) for forming the optical waveguide (12) on the top surface thereof and a first protection member (86) and a second protection member (87) corresponding to the material of the substrate (11) provided at an upper part of the waveguide (12) so as to make at least an end facet of each of the members form a plane (91) or (92) identical with the first end facet (84) or the second end facet (85), whichever appropriate, of the substrate (11) including the light incidence end or the light emission end, whichever appropriate, of the optical waveguide (11) and the incidence side reflType: ApplicationFiled: April 14, 2005Publication date: December 20, 2007Inventors: Motonobu Kourogi, Kazuhiro Imai, Widiyatmoko Bambang
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Patent number: 7239442Abstract: An optical frequency comb generator includes an oscillator (117) for oscillating modulating signals of a preset frequency, and an optical resonator (110) formed by an incident side reflecting mirror (112) and an outgoing side reflecting mirror (113), arranged parallel to each other. The optical resonator causes resonation in light incident via the incident side reflecting mirror (112). The optical frequency comb generator also includes an optical phase modulation unit (111) arranged between the incident side reflecting mirror (112) and the outgoing side reflecting mirror (113) for phase modulating the light, resonated by the optical resonator (110), by the modulating signals supplied from the oscillator (117), and for generating a plurality of sidebands centered about the frequency of the incident light at a frequency interval of the modulating signal. The outgoing side reflecting mirror (113) sets the transmittance from one frequency to another responsive to the light intensity of the generated sidebands.Type: GrantFiled: July 26, 2002Date of Patent: July 3, 2007Assignees: Japan Science and Technology AgencyInventors: Motonobu Kourogi, Widiyatmoko Bambang, Osamu Nakamoto, Shigeyoshi Misawa, Yoshinobu Nakayama
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Publication number: 20070076282Abstract: A resonance system (14, 15) is formed by a light incident side reflection mirror and a light exiting side reflecting mirror, arranged parallel to each other. The light incident on an incident side reflective mirror (14) is propagated in the outward path direction or in the backward path direction so that the light is set in a resonant state. The light in the resonant state in the resonance system (14, 15) is phase-modulated, responsive to a modulating signal supplied from an oscillating device (16) by a light modulation device (2) arranged between the light incident side reflective mirror (14) and the light exiting side reflective mirror (15). The oscillating device oscillates the modulating signal of a frequency fm.Type: ApplicationFiled: November 4, 2004Publication date: April 5, 2007Inventors: Motonobu Kourogi, Kazuhiro Imai, Wildiyatmoko Bambang
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Publication number: 20070018082Abstract: The broad range measurement exploiting the usual propagated light and the high resolution measurement mode exploiting near-field light are to be accomplished with a sole as-assembled optical probe. To this end, light radiated through an optical probe 13 having a light shielding coating layer 33 formed for defining a light radiating aperture D or light radiated at a core 31 of the optical probe 13 is propagated, as the optical probe 13 is moved in a direction towards and away from a surface for measurement 2a. The core of the optical probe is coated with a light shielding coating layer 33. In this manner, a spot of propagated light propagated through the core 31 or a spot of near-field light seeping from the light radiating aperture D is formed on the surface for measurement 2a, and light derived from the spot of light is detected.Type: ApplicationFiled: July 8, 2004Publication date: January 25, 2007Applicants: Kanagawa Academy of Science and Technology, Hoden Seimitsu Kakokenkyusho Co., Ltd.Inventors: Motoichi Ohtsu, Motonobu Kourogi, Shuji Mononobe, Takashi Yatsui, Koji Yamamoto, Toshiyuki Inokuchi, Matsato Takada
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Publication number: 20060153058Abstract: An optical-pickup slider is characterized in that a light-transmitting-property substrate is bonded to a surface of a layer having a tapered through hole, on which surface a larger opening of the tapered through hole exists. Thereby, it is possible to prevent the layer having an aperture from being destroyed. A method of manufacturing the optical-pickup slider comprises the steps of a) making a tapered through hole in a layer layered on a first substrate and having a thickness smaller than that of the first substrate; and, after bonding a light-transmitting-property substrate to a surface of the layer, removing the first substrate so as to expose an aperture at a tip of the tapered through hole.Type: ApplicationFiled: December 6, 2005Publication date: July 13, 2006Inventors: Junichi Takahashi, Motonobu Kourogi, Takashi Yatsui, Motoichi Ohtsu
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Patent number: 6993826Abstract: An optical-pickup slider is characterized in that a light-transmitting-property substrate is bonded to a surface of a layer having a tapered through hole, on which surface a larger opening of the tapered through hole exists. Thereby, it is possible to prevent the layer having an aperture from being destroyed. A method of manufacturing the optical-pickup slider comprises the steps of a) making a tapered through hole in a layer layered on a first substrate and having a thickness smaller than that of the first substrate; and, after bonding a light-transmitting-property substrate to a surface of the layer, removing the first substrate so as to expose an aperture at a tip of the tapered through hole.Type: GrantFiled: November 25, 2003Date of Patent: February 7, 2006Assignees: Ricoh Company, Ltd., Kanagawa Academy of Science and TechnologyInventors: Junichi Takahashi, Motonobu Kourogi, Takashi Yatsui, Motoichi Ohtsu
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Patent number: 6995350Abstract: In a near field optical probe, a through hole having an aperture is provided in a semiconductor photodetector including at least a first-conductive-type high-concentration impurity layer, a first-conductive-type low-concentration impurity layer and a second-conductivity impurity-introduced region.Type: GrantFiled: December 2, 2002Date of Patent: February 7, 2006Assignees: Ricoh Company, Ltd., Kanagawa Academy of Science and TechnologyInventors: Shunsuke Fujita, Junichi Takahashi, Motoichi Ohtsu, Motonobu Kourogi