Particular Resonant Cavity Patents (Class 372/92)
  • Patent number: 10338201
    Abstract: An example method for use with a LIDAR system includes assigning a firing time of a laser included in the LIDAR system. The assignment of the firing time includes: (i) receiving a universal clock signal at the LIDAR system, where the universal clock signal common to one or more other LIDAR systems; (ii) synchronizing a system clock of the LIDAR system to the universal clock signal to generate a synchronized clock signal; and determining the firing time based on the synchronized clock signal to reduce interference with the one or more other LIDAR systems. The method also includes firing the laser at the firing time.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: July 2, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Volodimir Slobodyanyuk, Daniel Butterfield
  • Patent number: 10283927
    Abstract: The line narrowed laser apparatus configured to perform a plurality of burst oscillations including a first burst oscillation and a second burst oscillation next to the first burst oscillation to output a pulse laser beam. The line narrowed laser apparatus comprises a laser resonator, a chamber provided in the laser resonator, a pair of electrodes provided in the chamber, an electric power source configured to apply a pulsed voltage to the pair of electrodes, a wavelength-selecting element provided in the laser resonator, a spectral width varying unit provided in the laser resonator, a wavelength variable unit configured to change a selected wavelength selected by the wavelength-selecting element, and a controller. The controller is configured to control the wavelength variable unit based on an amount of control of the spectral width varying unit in a period from a time of ending the first burst oscillation to a time of starting the second burst oscillation.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: May 7, 2019
    Assignee: Gigaphoton Inc.
    Inventors: Hiroshi Furusato, Takeshi Ohta, Natsuhiko Kouno, Osamu Wakabayashi, Takahito Kumazaki
  • Patent number: 9946029
    Abstract: An optical coupler structure may include a substrate, a waveguide section and an anchored cantilever section. The substrate may include a main body and a sub-pillar structure formed on the main body. The waveguide section may be disposed on the substrate, and may include a core waveguide of a first material surrounded by a cladding layer of a second material. The anchored cantilever section may be disposed on the sub-pillar structure on the substrate, which may be configured to support the cantilever section and separate the cantilever section from the main body of the substrate. The anchored cantilever section may include a multi-stage inverse taper core waveguide and a cladding layer, of the second material, which surrounds the multi-stage inverse taper core waveguide.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: April 17, 2018
    Assignee: SiFotonics Technologies Co, Ltd.
    Inventors: Tuo Shi, Tzung-I Su, Changhua Chen, Yongbo Shao, Dong Pan
  • Patent number: 9923529
    Abstract: Apparatuses, systems, and methods for a digital power amplifier (DPA) to generate a monotonic and linear ramp-up and ramp-down for a time division multiple access (TDMA) slot transmission are described. In one aspect, a monotonic and linear amplitude-to-control input code relationship model is generated for the DPA and stored. When the DPA needs to generate a ramp-up or ramp-down, the stored monotonic and linear amplitude-to-control input code relationship model is used to shape the input control code before it is input into the DPA. A new monotonic and linear amplitude-to-control input code relationship model may be generated and stored if the operating conditions change. The apparatuses, systems, and methods described herein may be applied to a multi-standard broadband modem chip capable of 2G transmission.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: March 20, 2018
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Siddharth Seth, Venumadhav Bhagavatula, Ivan Lu, Sang Won Son
  • Patent number: 9905993
    Abstract: Wavelength-selective external resonators can be used to greatly increase the output brightness of dense wavelength beam combining (DWBC) system beams by stabilizing the wavelengths of the beams emitted by the individual emitters of the DWBC laser source. The present invention pertains to external resonant cavities that utilize thin-film filtering elements as wavelength-selective elements in external resonators. The present invention further pertains to particular embodiments that utilize thin-film filtering elements in DWBC systems as both output beam coupling elements and wavelength selective elements. The present invention provides advantages over the prior art that include decreased cost, increased fidelity of wavelength selection, and increased wall plug efficiency.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: February 27, 2018
    Assignee: TRUMPF LASER GMBH
    Inventors: Rudolf Huber, Hagen Zimer, Alexander Killi, Christoph Tillkorn, Steffen Ried
  • Patent number: 9746627
    Abstract: A semiconductor laser module includes a semiconductor laser element outputting a laser light; an optical fiber; an optical component disposed at an outer periphery of the optical fiber and fixing the optical fiber; a first-fixing agent fastening the optical component and the optical fiber; a light-absorbing element disposed at an outer periphery of the optical component and fixing the optical component; a first light-blocking portion disposed between an end into which the laser light is incident of the optical fiber and the optical component; and a housing accommodating therein the semiconductor laser element, an end into which the laser light is incident of the optical fiber and the first light-blocking portion. The optical component has an optical transmittance at a wavelength of the laser light, and the light-absorbing element has an optical absorptivity at a wavelength of the laser light.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: August 29, 2017
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Yuta Ishige, Naoki Hayamizu, Etsuji Katayama, Toshio Kimura
  • Patent number: 9735541
    Abstract: A method of calibrating a tunable laser includes shifting a filter output peak defined by a tunable optical feedback filter of the tunable laser in an optical spectral domain to align with a target etalon output peak of a plurality of spaced etalon output peaks defined by an etalon of the tunable laser. The method also includes shifting a cavity frequency grid defined by cavity modes of the tunable laser to align a target cavity mode of the cavity frequency grid with the filter output peak and shifting the spaced output peaks defined by the etalon to align a target etalon output peak with a target wavelength of an output wavelength grid. The method includes modifying a bias current and a modulation current of a gain section of the tunable laser to achieve a defined output modulation amplitude and a defined extinction ratio.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: August 15, 2017
    Assignee: Google Inc.
    Inventors: Xiangjun Zhao, Cedric Fung Lam, Steven Fong
  • Patent number: 9702737
    Abstract: An optical ring resonator sensor array module for a passive SONAR system. The module includes a supporting structure; a silicon substrate mounted on the supporting structure, and a top plate mounted over the silicon structure. The silicon substrate includes an optical waveguide having an input and an output and a plurality of optical ring resonators distributed across the silicon substrate to form a two-dimensional pattern. Each optical ring resonator is positioned adjacent to the optical waveguide and each has a different predetermined diameter. The top plate includes a plurality of diaphragms, one for each of the plurality of optical ring resonators. The diaphragms are distributed on the top plate such that each of the plurality of diaphragms is positioned over an associated one of the plurality of optical ring resonators. In addition, each of the diaphragms is configured to flex in response to externally applied acoustical pressure.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: July 11, 2017
    Assignee: The Boeing Company
    Inventor: Brian C. Grubel
  • Patent number: 9478941
    Abstract: The present invention relates to an optically pumped solid state laser device, comprising a solid state laser medium (300-302) in a laser resonator. Several pump laser diodes (100) are arranged to optically pump said solid state laser medium (300-302) by reflection of pump radiation at a mirror element (200) arranged on the optical axis of the laser resonator. The mirror element (200) is designed to direct said pump radiation to the solid state laser medium (300-302) and to form at the same time one of the resonator mirrors of the laser resonator. With this design of the solid state laser device an easy alignment of the pump optics is achieved. The proposed solid state laser device can be realized in a compact form.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: October 25, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Stephan Gronenborn
  • Patent number: 9444573
    Abstract: A transmission device that receives an optical signal on which a frequency modulated signal is superimposed includes: an optical filter configured to filter the optical signal; a filter controller configured to control a passband of the optical filter based on a change of power of the optical signal; and a signal detection unit configured to detect the frequency modulated signal based on the change of the power of the optical signal filtered by the optical filter.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: September 13, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Shoichiro Oda
  • Patent number: 9385505
    Abstract: The wavelength of fundamental wave light emitted from a semiconductor laser is converted by a wavelength conversion element, and the wavelength-converted light is emitted. A power supply circuit feeds electric power to the semiconductor laser. A control part controls an amount of electric power to be fed to a heater such that the wavelength conversion element becomes a temperature that optimizes the wavelength conversion efficiency. Temperatures detected by an element temperature detector and a light source part temperature detector are introduced to the control part, and the control part takes a wavelength conversion element temperature, at which a temperature detected by the light source part temperature detector is minimum, as a set temperature that makes the wavelength conversion efficiency optimal, and feedback-controls the wavelength conversion element temperature such that the wavelength conversion element temperature is at the set temperature by controlling the heating quantity of the heater.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: July 5, 2016
    Assignee: USHIO DENKI KABUSHIKI KAISHA
    Inventors: Nobuhiko Sugihara, Kazuhiro Yoshida, Kentaro Fujita, Takanori Samejima
  • Patent number: 9368935
    Abstract: One embodiment is a wide stripe semiconductor waveguide, which is cleaved at a Talbot length thereof, the wide stripe semiconductor waveguide having facets with mirror coatings. A system provides for selective pumping the wide stripe semiconductor waveguide to create and support a Talbot mode. In embodiments according to the present method and apparatus the gain is patterned so that a single unique pattern actually has the highest gain and hence it is the distribution that oscillates.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: June 14, 2016
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Robert Rex Rice, Elizabeth Twyford Kunkee
  • Patent number: 9354394
    Abstract: An optical device is described. This optical device includes multiple components, such as a ring resonator, an optical waveguide and a grating coupler, having a common etch depth (which is associated with a single etch step or operation during fabrication). Moreover, these components may be implemented in a semiconductor layer in a silicon-on-insulator technology. By using a common etch depth, the optical device may provide: compact active devices, multimode ultralow-loss optical waveguides, high-speed ring resonator modulators with ultralow power consumption, and compact low-loss interlayer couplers for multilayer-routed optical links. Furthermore, the single etch step may help reduce or eliminate optical transition loss, and thus may facilitate high yield and low manufacturing costs.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: May 31, 2016
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Guoliang Li, Xuezhe Zheng, Ashok V. Krishnamoorthy
  • Patent number: 9335483
    Abstract: In order to prevent non-uniformity in emission wavelength among different sites along an optical axis direction, provided is a resonator portion including: a waveguide which includes at least two areas where an effective refraction index varies in the optical axis direction; and diffraction gratings formed along the optical axis direction of the waveguide. The diffraction grating that is formed in one of the at least two areas of the waveguide where the effective refraction index is large has a pitch narrower than a pitch of the diffraction grating that is formed in another of the at least two areas of the waveguide where the effective refraction index is small.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: May 10, 2016
    Assignee: OCLARO JAPAN, INC.
    Inventors: Norihito Kosugi, Syunya Yamauchi, Yoriyoshi Yamaguchi
  • Patent number: 9337622
    Abstract: Ultra compact DBRs, VCSELs incorporating the DBRs and methods for making the DBRs are provided. The DBRs are composed of a vertical reflector stack comprising a plurality of adjacent layer pairs, wherein each layer pair includes a layer of single-crystalline Group IV semiconductor and an adjacent layer of silicon dioxide.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: May 10, 2016
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Zhenqiang Ma, Jung-Hun Seo
  • Patent number: 9306369
    Abstract: Wavelength-selective external resonators can be used to greatly increase the output brightness of dense wavelength beam combining (DWBC) system beams by stabilizing the wavelengths of the beams emitted by the individual emitters of the DWBC laser source. The present invention pertains to external resonant cavities that utilize thin-film filtering elements as wavelength-selective elements in external resonators. The present invention further pertains to particular embodiments that utilize thin-film filtering elements in DWBC systems as both output beam coupling elements and wavelength selective elements. The present invention provides advantages over the prior art that include decreased cost, increased fidelity of wavelength selection, and increased wall plug efficiency.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: April 5, 2016
    Assignee: TRUMPF LASER GMBH
    Inventors: Rudolf Huber, Hagen Zimer, Alexander Killi, Christoph Tillkorn, Steffen Ried
  • Patent number: 9274272
    Abstract: A photonic device and methods of formation that provide an area providing reduced optical coupling between a substrate and an inner core of the photonic device are described. The area is formed using holes in the inner core and an outer cladding. The holes may be filled with materials which provide a photonic crystal. Thus, the photonic device may function as a waveguide and as a photonic crystal.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: March 1, 2016
    Assignee: Micron Technology, Inc.
    Inventors: Gurtej Sandhu, Roy Meade
  • Patent number: 9246310
    Abstract: A laser source based on a quantum cascade laser array (QCL), wherein the outputs of at least two elements in the array are collimated and overlapped in the far field using an external diffraction grating and a transform lens.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: January 26, 2016
    Assignees: President and Fellows of Harvard College, Massachusetts Institute of Technology
    Inventors: Anish Goyal, Benjamin G. Lee, Christian Pfluegl, Laurent Diehl, Mikhail Belkin, Antonio Sanchez-Rubio, Federico Capasso
  • Patent number: 9219111
    Abstract: A nitride semiconductor structure of the present invention is obtained by growing an h- or t-BN thin film (12) and a wurtzite-structure AlxGa1-xN (x>0) thin film (14) as buffer layers and forming a single-crystal wurtzite-structure AlGaInBN thin film (13) thereon. While GaN, AlGaN, AlN, and the like have the wurtzite structure with sp3 bonds, h-BN or t-BN has the graphite structure with sp2 bonds, and has a completely different crystal structure. Accordingly, it has heretofore not been considered that a wurtzite-structure AlGaInBN thin film can be grown on a graphite-structure h-BN thin film. However, when a wurtzite-structure AlxGa1-xN (x>0) thin film (14) is formed as a buffer layer on a graphite-structure boron nitride thin film (12), a wurtzite-structure AlGaInBN (13) nitride semiconductor structure such as GaN can be grown on the buffer layer.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: December 22, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Yasuyuki Kobayashi, Kazuhide Kumakura, Tetsuya Akasaka, Toshiki Makimoto
  • Patent number: 9219346
    Abstract: A laser diode assembly includes: a mode-locked laser diode device; a diffraction grating that configures an external resonator, returns primary or more order diffracted light to the mode-locked laser diode device, and outputs 0-order diffracted light outside; and an imaging section provided between the mode-locked laser diode device and the diffraction grating and imaging an image of a light output end face of the mode-locked laser diode device on the diffraction grating.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: December 22, 2015
    Assignees: Sony Corporation, Tohoku University
    Inventors: Shunsuke Kono, Hiroyuki Yokoyama, Masaru Kuramoto, Tomoyuki Oki
  • Patent number: 9214368
    Abstract: Individually operable laser diodes in an array are associated with optical fibers for treatment of a material. Each laser diode has a generally Gaussian or similar profile. A guide block receives optical fiber terminal distal ends and enables irradiation of a surface for treatment with overlapping profiles. A control system controls individual laser diodes to achieve desired illumination profiles for a given process. The process is performed in a suitable environment which may include a vacuum system, controlled gaseous environment, or in a doping medium such as a surface coating or even a liquid. Optional relay optics interposed between the terminal distal ends and the treatment material allows distant relaying and reimaging. An optical isolator assembly may be interposed between the relay optics and the treatment material. The system and related methods allow direct irradiation from laser diodes to treat materials.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: December 15, 2015
    Assignee: IPG PHOTONICS CORPORATION
    Inventors: Bernhard Piwczyk, William Shiner
  • Patent number: 9202489
    Abstract: An apparatus that includes a slider having a mounting surface, the mounting surface opposite a media-facing surface of the slider. The apparatus includes a laser diode mounted on a side surface to the mounting surface. The laser diode has an active region of the laser diode is disposed substantially perpendicular to the mounting surface.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: December 1, 2015
    Assignee: Seagate Technology LLC
    Inventors: Nils Gokemeijer, Edward Charles Gage, Roger L. Hipwell, Michael Christopher Kautzky, Scott Eugene Olson
  • Patent number: 9160136
    Abstract: A first amplification structure uses a single pass external diffusion amplifier wherein the picosecond beam cross-sectional area is matched to the cross-sectional area of the gain medium. A half waveplate between the gain medium and the incoming beam optimizes the polarization of the beam diameter to the polarization of the gain medium. A second amplification structure uses a double pass external diffusion amplifier wherein the beam cross-sectional area is matched to the cross-sectional area of the gain medium and passed twice therethrough. A half waveplate and a rotator create a right circular polarized beam through the gain medium and a maximum “R” coated reflector resides beyond the external diffusion amplifier and reflects a left circular polarized beam back through the gain medium, the rotator and the half waveplate where it becomes horizontally polarized and is then transmitted out of the amplification structure by the polarization sensitive beam splitter.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: October 13, 2015
    Assignee: LEE LASER, INC.
    Inventors: Donald Bishop, Dwight Kimberlin
  • Patent number: 9140853
    Abstract: An optical device includes first and second waveguides and a micro-ring. The first waveguide is optically coupled to the micro-ring and is separated from the micro-ring by a first gap having a first gap distance. The second waveguide has a supply port, an output port, and a coupling portion optically coupled to the micro-ring. The coupling portion is separated from the micro-ring by a second gap having a second distance. The second gap distance is larger than the first gap distance. The second waveguide and the micro-ring cooperate to form a filter having a stop band. The first gap distance is selected such that a first optical signal on the first waveguide having a first strength causes a first shift in the stop band such that a first wavelength is within the stop band, and wherein the second gap distance is selected such that a second optical signal on the second waveguide having the first strength causes a second or no shift in the stop band such that the first wavelength is outside of the stop band.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: September 22, 2015
    Assignee: Purdue Research Foundation
    Inventors: Leo Tom Varghese, Minghao Qi, Li Fan, Jian Wang
  • Patent number: 9099834
    Abstract: The present invention relates to an optically pumped vertical external-cavity surface-emitting laser device comprising at least one VECSEL (200) and several pump laser diodes (300). The pump laser diodes (300) are arranged to optically pump the active region (108) of the VECSEL (200) by reflection of pump radiation (310) at a mirror element (400). The mirror element (400) is arranged on the optical axis (210) of the VECSEL (200) and is designed to concentrate the pump radiation (310) in the active region (108) and to form at the same time the external mirror of the VECSEL (200). The proposed device avoids time consuming adjustment of the pump lasers relative to the active region of the VECSEL and allows a very compact design of the laser device.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: August 4, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Stephan Gronenborn, Michael Miller
  • Patent number: 9084587
    Abstract: An apparatus enabling a casual user in a residential set-up to perform himself almost every skin treatment procedure by using a variety of modules that may be inserted into an infrastructure frame. The apparatus presents a docking station and an applicator. The applicator simultaneously receives only two types of skin treatment modules, these may be replaced after use for modules providing a different type of skin treatment. Such skin treatment modules like epilator, shaver, exfoliation or abrasive module, suction head, and massage head apply a mechanical action to the skin. Ultrasound module applies ultrasound waves to the skin. Intense pulsed light and RF apply electromagnetic radiation to the skin. A combination of these modules may be used to provide a variety of skin treatments such as hair removal, skin rejuvenation, skin exfoliation, acne treatment, circumference reduction, and other skin treatments.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: July 21, 2015
    Assignee: SYNERON MEDICAL LTD
    Inventors: Shimon Eckhouse, Tuvia Dror Kutscher, Gilead Bar-Ilan
  • Patent number: 9088132
    Abstract: A semiconductor optical element includes an optical waveguide formed on a semiconductor substrate, which includes: a single mode guide portion which guides input light in a single mode; a curved portion disposed at a downstream side of the single mode guide portion in a waveguide direction of the light and guiding the light in a single mode; and a flared portion disposed at a downstream side of the curved portion in the waveguide direction and of which waveguide width is widened toward the waveguide direction, so that the flared portion can guide the light in a single mode at an light-input side and the flared portion can guide the light in a multi-mode at a light-output side. The input light is optically-amplified by each of the active layers in the single mode guide portion, the curved portion and the flared portion by an optically-amplifying effect of the active layers.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: July 21, 2015
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventor: Kazuaki Kiyota
  • Patent number: 9071037
    Abstract: A pulsed laser comprises an oscillator and amplifier. An attenuator and/or pre-compressor may be disposed between the oscillator and amplifier to improve performance and possibly the quality of pulses output from the laser. Such pre-compression may be implemented with spectral filters and/or dispersive elements between the oscillator and amplifier. The pulsed laser may have a modular design comprising modular devices that may have Telcordia-graded quality and reliability. Fiber pigtails extending from the device modules can be spliced together to form laser system. In one embodiment, a laser system operating at approximately 1050 nm comprises an oscillator having a spectral bandwidth of approximately 19 nm. This oscillator signal can be manipulated to generate a pulse having a width below approximately 90 fs. A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: June 30, 2015
    Assignee: IMRA America, Inc.
    Inventors: Xinhua Gu, Mark Bendett, Gyu Cheon Cho, Martin E. Fermann
  • Patent number: 9054493
    Abstract: In a multiple-wavelength laser source, a multiple-mode laser outputs a set of wavelengths in a range of wavelengths onto an optical waveguide, where a spacing between adjacent wavelengths in the set of wavelengths is smaller than a width of channels in an optical link. Furthermore, a set of ring-resonator filters in the multiple-wavelength laser source, which are optically coupled to the optical waveguide, output corresponding subsets of the set of wavelengths for use in the optical link based on free spectral ranges and quality factors of the set of ring-resonator filters. These subsets may include one or more groups of wavelengths, with another spacing between adjacent groups of wavelengths that is larger than the width of the given channel in the optical link. In addition, the one or more groups of wavelengths may include one or more wavelengths, with the spacing between adjacent wavelengths in the given group of wavelengths.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: June 9, 2015
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Ashok V. Krishnamoorthy, Xuezhe Zheng
  • Patent number: 9048619
    Abstract: A laser diode assembly includes: a mode-locked laser diode device; a diffraction grating that configures an external resonator, returns primary or more order diffracted light to the mode-locked laser diode device, and outputs 0-order diffracted light outside; and an imaging section provided between the mode-locked laser diode device and the diffraction grating and imaging an image of a light output end face of the mode-locked laser diode device on the diffraction grating.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: June 2, 2015
    Assignees: Sony Corporation, Tohoku University
    Inventors: Shunsuke Kono, Hiroyuki Yokoyama, Masaru Kuramoto, Tomoyuki Oki
  • Patent number: 9042414
    Abstract: A tunable laser source that includes multiple gain elements and uses a spatial light modulator in an external cavity to produce spectrally tunable output is claimed. Several designs of the external cavity are described, targeting different performance characteristics and different manufacturing costs for the device. Compared to existing devices, the tunable laser source produces high output power, wide tuning range, fast tuning rate, and high spectral resolution.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: May 26, 2015
    Assignee: Spectral Sciences, Inc.
    Inventors: Pajo Vukovic-Cvijin, Neil Goldstein
  • Patent number: 9031113
    Abstract: The invention relates to an optical resonator, laser apparatus and a method of generating a laser beam inside an optical resonator. The optical resonator (100) includes an optical cavity (102) and an optical element (104.1, 104.2) at either end thereof, operable to sustain a light beam (108) therein, characterized in that each optical element (104.1, 104.2) is a phase-only optical element operable to alter a mode of the beam (108) as it propagates along the length of the optical resonator (100), such that in use the beam (108) at one end of the optical resonator (100) has a Gaussian profile while the beam (108) at the other end of the optical resonator (100) has a non-Gaussian profile.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: May 12, 2015
    Assignee: CSIR
    Inventors: Ihar Anatolievich Litvin, Andrew Forbes
  • Patent number: 9020004
    Abstract: A ring resonator is connected to an optical amplifier. The ring resonator and optical amplifier are contained within the optical path of an optical resonator formed by a first and second reflector. The optical coupler branches part of the light conducting from the optical amplifier to the ring resonator within the optical resonator off to an output optical waveguide.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Limited
    Inventor: Seokhwan Jeong
  • Patent number: 9014230
    Abstract: Single-mode quantum cascade lasers having shaped cavities of various geometries are provided. The shaped cavities function as monolithic coupled resonators, and permit single-mode operation of the lasers. A folded or hairpin-shaped cavity could be provided, having a plurality of straight segments interconnected with a curved segment. Additionally, a shaped cavity could be provided having a single straight segment interconnected at one end to a curved segment. The curved segment could also be tapered in shape, such that the width of the curved segment decreases toward one end of the curved segment. A laser which includes a shaped cavity having two interconnected, folded shaped cavities is also provided.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: April 21, 2015
    Assignee: The Trustees of Princeton University
    Inventors: Qiang Liu, Claire Gmachl, Kamil Przemyslaw Sladek
  • Patent number: 8995052
    Abstract: A solid-state MOPA includes a mode-locked laser delivering a train of pulses. The pulses are input to a fast E-O shutter, including polarization-rotating elements, polarizing beam-splitters, and a Pockels cell that can be driven alternatively by high voltage (HV) pulses of fixed long and short durations. A multi-pass amplifier follows the E-O shutter. The E-O shutter selects every Nth pulse from the input train and delivers the selected pulses to the multi-pass amplifier. The multi-pass amplifier returns amplified seed-pulses to the E-O shutter. The shutter rejects or transmits the amplified pulses depending on whether the HV-pulse duration is respectively short or long. Transmitted amplified pulses are delivered to a transient amplifier configured for separately suppressing first-pulse over-amplification and residual pulse leakage.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: March 31, 2015
    Assignee: Coherent Kaiserslautern GmbH
    Inventors: Ralf Knappe, Albert Seifert, Alexander Weis
  • Publication number: 20150086151
    Abstract: Stabilization of an injection locked optical frequency comb is achieved through polarization spectroscopy of an active laser cavity, eliminating optical PM sidebands inherent in previous stabilization methods. Optical SNR of 35 dB is achieved. A monolithic AlInGaAs quantum well Fabry-Prot laser injection locked to a passively mode-locked monolithic laser is presented here. The FP laser cavity can be used as a true linear interferometric intensity modulator for pulsed light.
    Type: Application
    Filed: April 11, 2013
    Publication date: March 26, 2015
    Applicant: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Peter J. Delfyett, Charles Williams, Edris Sarailou
  • Patent number: 8982923
    Abstract: An apparatus includes a slider with a cavity in a trailing end of the slider. A laser is positioned in the cavity and has an output facet positioned adjacent to a first wall of the cavity. A cap is connected to the trailing end of the slider and covers the laser.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: March 17, 2015
    Assignee: Seagate Technology LLC
    Inventors: Douglas Cole, Lijuan Zhong, Roger Lee Hipwell, Jr., Joseph Michael Stephan, Scott Eugene Olson, Tanya Jegeris Snyder, Yongjun Zhao
  • Patent number: 8976834
    Abstract: A method of generating intra-resonator laser light (1) comprises the steps of coupling input laser light (2), e. g.
    Type: Grant
    Filed: September 6, 2010
    Date of Patent: March 10, 2015
    Assignee: Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.
    Inventors: Jan Kaster, Ioachim Pupeza, Ernst Fill, Ferenc Krausz
  • Publication number: 20150063398
    Abstract: A laser light source includes an optical resonator and a first optical filter. The first optical filter is provided outside the optical resonator, and does not constitute an optical resonator structure. For example, antireflection coating is performed on the optical resonator side of the first optical filter and on a surface on the opposite side thereto, and a reflection structure in which light after passing through the first optical filter is reflected in the direction to the optical resonator is not present on an optical path of the light.
    Type: Application
    Filed: August 14, 2014
    Publication date: March 5, 2015
    Inventor: Takeshi OKAMOTO
  • Patent number: 8971360
    Abstract: An optical module includes a light source. The light source can be a swept wavelength light source, and optical module includes a wavemeter. The wavemeter includes a wavemeter tap capable of directing a wavemeter portion of light produced by the light source away from a main beam, a wavelength selective filter arranged to receive the wavemeter portion, a first wavemeter detector arranged to measure a transmitted radiation intensity of radiation transmitted through the filter, and a second wavemeter detector arranged to measure a non-transmitted radiation intensity of radiation not transmitted through but reflected by the filter. In addition, an optical coherence tomography apparatus includes the optical module.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: March 3, 2015
    Assignee: Exalos AG
    Inventors: Jan Lewandowski, Marcus Duelk, Christian Velez
  • Patent number: 8955987
    Abstract: A light emitting device includes a substrate, a laminated body formed by stacking a first cladding layer, a first active layer, a second cladding layer, a third cladding layer, a second active layer, and a fourth cladding layer on the substrate in this order, a first electrode connected to the first cladding layer, a second electrode connected to the second cladding layer and the third cladding layer, and a third electrode connected to the fourth cladding layer, the first active layer generates first light using the first electrode and the second electrode, the second active layer generates second light using the second electrode and the third electrode, and a side surface of the first active layer is provided with an emitting section for emitting the first light, and a side surface of the second active layer is provided with an emitting section for emitting the second light.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: February 17, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Masamitsu Mochizuki
  • Patent number: 8948220
    Abstract: A microcrystal laser assembly including a gain-crystal includes a frame having a high thermal conductivity. The frame has a base with two spaced apart portions extending from the base. The gain-crystal has a resonator output minor on one surface thereof. The gain-crystal is supported on the spaced-apart portions of the frame in the space therebetween. Another resonator minor is supported in that space, spaced apart from the output mirror, on a pedestal attached to the base of the frame. The pedestal and the frame have different CTE. Varying the frame temperature varies the spacing between the resonator minors depending on the CTE difference between the pedestal and the frame.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: February 3, 2015
    Assignee: Coherent GmbH
    Inventor: Stefan Spiekermann
  • Publication number: 20150003486
    Abstract: A laser resonator arrangement includes multiple glass optical components, and a glass carrier plate, in which at least one of the optical components is secured to the carrier plate by at least one laser welding connection or is secured to the carrier plate through an intermediate glass element, in which the intermediate glass element is connected to both the at least one optical component and to the carrier plate by at least one laser welding connection.
    Type: Application
    Filed: September 19, 2014
    Publication date: January 1, 2015
    Inventors: Dietmar Kruse, Carsten Ziolek, Stefan Marzenell, Hagen Zimer
  • Patent number: 8908736
    Abstract: The present disclosure relates to a nanolaser generator using a transparent graphene electrode, a method for manufacturing the same, and a single nanopillar LED using the same. The nanolaser generator includes a microdisk resonator, a protruding dielectric ring provided to surround a boundary surface of the microdisk resonator, an external dielectric ring provided at an outer side of the microdisk resonator, and a transparent graphene electrode provided at upper surfaces of the microdisk resonator, the protruding dielectric ring and the external dielectric ring. Therefore, the processes required for generating a nanolaser may be reduced by half in comparison to a general technique, and a nanolaser may be generated just with a micro current.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: December 9, 2014
    Assignee: Korea University Research and Business Foundation
    Inventors: Hong-Gyu Park, Yoon-Ho Kim, Minsoo Hwang, Soon-Hong Kwon
  • Patent number: 8891579
    Abstract: A laser diode apparatus including a mounting block, a plurality of diode lasers mounted to the mounting block and each capable of emitting a respective diode laser beam, and a plurality of cylindrical mirrors each having a reflective back surface for providing slow axis collimation of an incident diode laser beam via reflection off the back surface, each one of the plurality of cylindrical mirrors optically coupled to a respective diode laser of the plurality of diode lasers and optically oriented therewith so as to be capable of providing the diode laser beams in a stacked arrangement.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: November 18, 2014
    Assignee: nLIGHT Photonics Corporation
    Inventors: Kirk Price, Scott Lerner
  • Patent number: 8891581
    Abstract: A multi-wavelength semiconductor laser device includes a block having a V-shaped groove with two side faces extending in a predetermined direction; and laser diodes with different light emission wavelengths mounted on the side faces of the groove in the block so that their laser beams are emitted in the predetermined direction.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yuji Okura
  • Patent number: 8873601
    Abstract: A laser (12, 18) with a laser resonator (13), the laser resonator (13) having a non-linear optical loop mirror (1, 1?), NOLM, which is adapted to guide counter-propagating portions of laser pulses, and to bring the counter-propagating portions of laser pulses into interference with each other at an exit point (4) of the NOLM (1, 1?). The non-linear optical loop mirror (1, 1?) has a non-reciprocal optical element (7, 7?).
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: October 28, 2014
    Assignee: Menlo Systems GmbH
    Inventors: Wolfgang Haensel, Ronald Holzwarth, Ralf Doubek, Michael Mei
  • Patent number: 8867585
    Abstract: The present invention provides a laser oscillator using an electroluminescent material that can enhance directivity of emitted laser light and resistance to a physical impact. The laser oscillator has a first layer including a concave portion, a second layer formed over the first layer to cover the concave portion, and a light emitting element formed over the second layer to overlap the concave portion, wherein the second layer is planarized, an axis of laser light obtained from the light emitting element intersects with a planarized surface of the second layer, the first layer has a curved surface in the concave portion, and a refractive index of the first layer is lower than that of the second layer.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: October 21, 2014
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Ryoji Nomura, Akihisa Shimomura
  • Patent number: 8867586
    Abstract: A diode laser is provided with wavelength stabilization and vertical collimation of the emitted radiation, which allows a small distance of the volume Bragg grating from the emitting surface, a small vertical diameter of the collimated beam and also compensation for manufacturing tolerances affecting the shape of the grating and the lens. The diode laser comprises an external frequency-selective element for wavelength stabilization of the laser radiation, wherein the external frequency-selective element comprises an entry surface facing the exit facet and an exit surface facing away from the exit facet and is designed as a volume Bragg grating; and wherein the external frequency-selective element is designed in such a manner that the divergence of the radiation emitting from the exit facet is reduced during passage through the external frequency-selective element.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: October 21, 2014
    Assignee: Forschungsverbund Berlin E.V.
    Inventor: Bernd Eppich
  • Patent number: 8867584
    Abstract: An optical parametric oscillator comprising: an optical cavity; a semiconductor gain-medium located within the optical cavity, such that together they form a semiconductor laser, and a nonlinear material located within the cavity such that the nonlinear material continuously generates down-converted idler- and signal-waves in response to a pump-wave continuously generated by the semiconductor gain-medium, wherein the pump wave is resonant within the optical cavity and one or other but not both of the down-converted waves is resonant within the pump wave cavity or a further optical cavity. Brewster plates ensure singly resonant optical parametric oscillators and a birefringent filer is used for frequency setting. Coupled cavities allow for setting the photon lifetime in the cavity that relaxation oscillations are prevented.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: October 21, 2014
    Assignee: University Court of the University of St Andrews
    Inventors: Malcolm H. Dunn, David Stothard