Having A Ring Configuration Patents (Class 372/94)
  • Patent number: 10809459
    Abstract: An integrated polarization splitter and rotator (PSR) employs the TE0 and TE1 modes of propagating light, rather than the TE0 and TM0 modes used in conventional prior art PSR. The integrated PSR exhibits appreciably flatter wavelength response because it does not require a directional coupler to de-multiplex incoming polarizations. The PSR allows tuning of the TM0 loss to reduce polarization dependent loss (PDL). This integrated polarization splitter and rotator is applicable to all integrated platforms including Silicon-on-Insulator (SOI) and III-V semiconductor compound systems. The PSR may be very compact (12√ó2 ?m2), and provides low loss (<0.3 dB across the C-band) and ultra-broadband operation. The PSR also affords better control of polarization dependent losses.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: October 20, 2020
    Assignee: Elenion Technologies, LLC
    Inventors: Yang Liu, Yangjin Ma, Michael J. Hochberg
  • Patent number: 10615566
    Abstract: A tunable optical comb generator having a source laser configured to generate a continuous wave (CW) light at a first wavelength; and a microresonator coupled to the source laser and configured to receive the CW light and generate an optical signal having a plurality of output wavelengths corresponding to the first wavelength. The generator includes a microresonator tuning device coupled to the microresonator and configured to tune the microresonator to compensate the microresonator for wavelength shifts. A control circuit is coupled to the microresonator tuning device and configured to generate a control signal to control the microresonator tuning device based on the optical signal. Multiple microresonators in the form of microrings may be included to tune the generator. A heater coupled to the microresonators may be used to adjust the microresonators.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: April 7, 2020
    Assignee: Purdue Research Foundation
    Inventors: Andrew Marc Weiner, Minghao Qi, Xiaoxiao Xue
  • Patent number: 10598859
    Abstract: An optoelectronic component including an optical waveguide integrated into a plane of the component. The optical waveguide configured to guide optical radiation in the plane. The component including a coupling element connected to the waveguide and coupling optical radiation into the waveguide along the main coupling path. The degree of coupling efficiency of the coupling element is less than one in respect to the main coupling path. The coupling element outputs optical loss radiation along a secondary coupling path. The optical loss radiation is proportional to the radiation transferred along the main coupling path. The optoelectronic component includes a detector connected to the coupling element that registers the optical loss radiation and produces a detector signal. The optoelectronic component includes a control unit configured to influence at least one operating variable of the optoelectronic component based on the detector signal.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: March 24, 2020
    Assignee: TECHNISCHE UNIVERSIT√ĄT BERLIN
    Inventors: Stefan Meister, Hanjo Rhee, Christoph Theiss, Aws Al-Saadi
  • Patent number: 10502570
    Abstract: Methods and apparatus optically measure acceleration, without Sagnac-effect corruption, without requiring slow light and without moving parts. Each optical accelerometer includes at least one measurement cell and at least one reference cell. Two optical signals traverse the cells in opposite directions around a figure-8-configured optical path and then interfere to produce an output signal. The reference cells have different indices of refraction than the measurement cells. Acceleration differentially affects speeds of the optical signals traversing the measurement and reference cells through differentially affecting the indices of refraction of the measurement and reference cells. These differences are evident in changes in the interference in the output signal, thereby enabling measurement of the acceleration. Several embodiments, including optical bench, vertical slab multi-pass, toroidal prism, planar waveguide, cylindrical waveguide, wound waveguide and optical fiber, are described.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: December 10, 2019
    Inventor: Marvin A. Biren
  • Patent number: 10490976
    Abstract: A laser source including a germanium-based semiconductor layer, including a suspended membrane formed of a tensilely stressed central portion and including an optical amplification section, and a plurality of tensioning arms. It includes an integrated waveguide, which participates in forming an optical cavity and which is located level with the carrier layer and at distance from the suspended membrane, the waveguide including a coupling section located facing the optical application section, which is suitable for allowing evanescent-wave optical coupling to the latter, and at least one curved section, which extends the coupling section, and which is arranged so that the integrated waveguide is placed at distance, in orthogonal projection, from the tensioning arms.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: November 26, 2019
    Assignee: Commissariat A L'Energie Atomique et aux Energies Alternatives
    Inventors: Vincent Reboud, Salim Boutami
  • Patent number: 10281328
    Abstract: Provided are a Bragg grating and a spectroscopy device including the same. The Bragg grating is disposed at each of opposite ends of a resonator for reflecting light of a certain wavelength band and includes a core member extending from a waveguide of the resonator in a lengthwise direction of the waveguide; a plurality of first refractive members protruding from the core member and spaced apart from each other along the lengthwise direction; and a second refractive member filling spaces between the first refractive members and having a refractive index different from a refractive index of the first refractive members.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: May 7, 2019
    Assignees: SAMSUNG ELECTRONICS CO., LTD., IMEC VZW
    Inventors: Dongho Kim, Jeonghwan Song
  • Patent number: 10175046
    Abstract: Methods and apparatus optically measure acceleration, without Sagnac-effect corruption, without requiring slow light and without moving parts. Each optical accelerometer includes at least one measurement cell and at least one reference cell. Two optical signals traverse the cells in opposite directions around a figure-8-configured optical path and then interfere to produce an output signal. The reference cells have different indices of refraction than the measurement cells. Acceleration differentially affects speeds of the optical signals traversing the measurement and reference cells through differentially affecting the indices of refraction of the measurement and reference cells. These differences are evident in changes in the interference in the output signal, thereby enabling measurement of the acceleration. Several embodiments, including optical bench, vertical slab multi-pass, toroidal prism, planar waveguide, cylindrical waveguide, wound waveguide and optical fiber, are described.
    Type: Grant
    Filed: May 28, 2018
    Date of Patent: January 8, 2019
    Inventor: Marvin A. Biren
  • Patent number: 9983005
    Abstract: Methods and apparatus optically measure acceleration, without Sagnac-effect corruption, without requiring slow light and without moving parts. Each optical accelerometer includes at least one measurement cell and at least one reference cell. Two optical signals traverse the cells in opposite directions around a figure-8-configured optical path and then interfere to produce an output signal. The reference cells have different indices of refraction than the measurement cells. Acceleration differentially affects speeds of the optical signals traversing the measurement and reference cells through differentially affecting the indices of refraction of the measurement and reference cells. These differences are evident in changes in the interference in the output signal, thereby enabling measurement of the acceleration. Several embodiments, including optical bench, vertical slab multi-pass, toroidal prism, planar waveguide, cylindrical waveguide, wound waveguide and optical fiber, are described.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: May 29, 2018
    Inventor: Marvin A. Biren
  • Patent number: 9786602
    Abstract: A device includes a substrate feature disposed over a substrate. The substrate feature has a first length extending along a first direction and a second length extending along a second direction. The first length is greater than the second length. The device also includes a first material feature disposed over the substrate. The first material feature has a first surface in physical contact with the substrate feature and a second surface opposite to the first surface. The first surface has a third length extending along the first direction and a fourth length extending along the second direction. The third length is greater than the fourth length. The second surface has a fifth length extending along the first direction and a sixth length extending along the second direction. The sixth length is greater than the fifth length.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: October 10, 2017
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Shih-Ming Chang, Chih-Tsung Shih
  • Patent number: 9748726
    Abstract: This invention describes algorithmic and computational approaches to optimize the design and performance of microresonator based ultra-low noise lasers including a reflector or filter comprised of multiple (?3) microresonator rings with different ring radii coupled together through bus waveguides. The enhanced reflector/filter design optimization provides more control over the key parameters, including the suppression ratio of unwanted modes over both a wide wavelength range (supporting wide wavelength tunability) and over the narrow range around the laser wavelength (improving laser singlemode and noise performance), while also enabling the design of specific reflector/filter bandwidth and effective length (delay), supporting the design of an ultra-low noise laser with specific operating performance parameters.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: August 29, 2017
    Assignee: Morton Photonics
    Inventors: Paul A. Morton, Jacob Khurgin, Christopher D. Morton
  • Patent number: 9653872
    Abstract: A ring laser includes a large-core rare-earth-doped fiber ring-connected with a free-space path having an electro-optic switch, output coupler, and intracavity band-pass filter to enforce lasing operation in narrow wavelength range. In some cavity-dumped modes, the laser is configured in a similar manner, except that an output coupler is omitted since the optical power is extracted from the laser cavity by the electro-optic switch itself. The same laser can be configured to operate in Q-switched and/or cavity-dumping modes as well as in hybrid modes (e.g., partial Q-switch, followed by cavity dumping, or even CW). In some embodiments, the laser can be used as, or inject laser light into, a regenerative solid-state amplifier, or a Raman laser, or can be also used to generate visible, ultra-violet, mid-infrared, and far-infrared (THz) radiation via nonlinear wavelength conversion processes. The various embodiments can use a power oscillator or seed-plus-amplifier MOPA configuration.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: May 16, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Fabio Di Teodoro, Tracy W. Vatter, Christopher D. Brooks, Robert W. Royse, Matthias P. Savage-Leuchs
  • Patent number: 9559484
    Abstract: This invention provides ultra-low noise lasers with exceptional performance through the use of ultra-low loss microresonator based filters/reflectors including multiple (?3) microresonator rings with different ring radii. The ultra-low loss microresonators provide a long effective laser cavity length enabling very narrow linewidth laser operation, with multiple (?3) microresonators providing extremely high selectivity of the lasing mode over a very wide wavelength range; supporting single wavelength and widely tunable wavelength laser operation. The highly selective and also low loss filter/reflector supports high output power operation of the lasers.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: January 31, 2017
    Assignee: Morton Photonics Inc.
    Inventors: Paul A. Morton, Jacob Khurgin
  • Patent number: 9419405
    Abstract: A laser includes an active ring, a passive waveguide, and a reflector. The active ring is to generate light. The passive waveguide is associated with the active ring to capture generated light. The reflector is associated with the passive waveguide to cause captured light from the waveguide to be coupled into the active ring to trigger domination of unidirectional lasing in the active ring to generate light.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: August 16, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Di Liang, David A. Fattal
  • Patent number: 9316483
    Abstract: An optical coherence tomography system utilizes an optical swept laser that has improved coherence length in the swept optical signal. This is accomplished using an intra-cavity element that extracts the tunable optical signal at the optimal location within the laser's resonant cavity. Generally this location is between the intracavity tuning element and the cavity's gain element so that light coming from the tuning element is extracted. In general in lasers, the gain element adds noise and chirp and this degrades the tunable optical signal's coherence length.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: April 19, 2016
    Assignee: Axsun Technologies LLC
    Inventor: Dale C. Flanders
  • Patent number: 9261716
    Abstract: An optical semiconductor device includes a ring waveguide, and a serpentine waveguide configured to be optically connected to the ring waveguide and surround at least a part of the ring waveguide in a serpentine form. In the optical semiconductor device, the serpentine waveguide heats the ring waveguide by absorbing input light propagated from the ring waveguide to the serpentine waveguide.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: February 16, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Tomoyuki Akiyama
  • Patent number: 9225143
    Abstract: A compact laser is provided for in accordance with an exemplary embodiment in the present disclosure includes a compact resonator structure using a non-planar geometry of bulk components. The laser includes a preferred rotational direction of lasing modes and employs bulk components for establishing the preferred rotational direction of lasing modes within resonator. In some embodiments, the preferred rotational direction of lasing modes is established using a reflective element that is outside the resonator structure. In some embodiments, the reflective element induces polarization shifts in the reflected light that are compensated for by a wave plate, which may be outside the resonator structure.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: December 29, 2015
    Assignee: Arete Associates
    Inventor: James Thomas Murray
  • Patent number: 9219347
    Abstract: An optical semiconductor device includes a ring laser including a ring resonator in which an optical gain element having an optical gain by current injection is provided, a waveguide optically coupled to the ring laser, and a reflector provided at an end portion of the waveguide and configured to reverse the advancing direction of light outputted from the ring laser and propagating in the waveguide.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: December 22, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Tomoyuki Akiyama
  • Patent number: 9158069
    Abstract: An apparatus includes an optical ring resonator, first and second optical couplers, and control circuitry. The first optical coupler is configured to modulate an input optical signal traversing an optical waveguide, by tuning cross-coupling of energy between the optical waveguide and the ring resonator with a first variable coupling coefficient. The second optical coupler is configured to tune cross-coupling of energy between the ring resonator and an auxiliary optical signal, different from the input optical signal, with a second variable coupling coefficient. The control circuitry is configured to modulate the first coupling coefficient with a first control signal so as to modulate the input optical signal, and to modulate the second coupling coefficient with a second control signal, so as to retain a constant electrical-field complex envelope in the ring resonator.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: October 13, 2015
    Assignee: TECHNION RESEARCH & DEVELOPMENT FOUNDATION LTD.
    Inventors: Anna Kodanev, Meir Orenstein
  • Patent number: 9130342
    Abstract: A laser includes an active ring, a passive waveguide, and a reflector. The active ring is to generate light. The passive waveguide is associated with the active ring to capture generated light. The reflector is associated with the passive waveguide to cause captured light from the waveguide to be coupled into the active ring to trigger domination of unidirectional lasing in the active ring to generate light.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: September 8, 2015
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Di Liang, David A. Fattal
  • Patent number: 9086584
    Abstract: A wavelength converter includes an optical resonator that is optically coupled to a waveguide. The refractive index of the optical resonator is dynamically changed, such as by injecting free carriers into the resonator. This effectively changes that optical path length of the light, thus converting the wavelength.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: July 21, 2015
    Assignee: Cornell University
    Inventors: Stefan Preble, Michal Lipson
  • Patent number: 9075001
    Abstract: An intracavity laser absorption infrared spectroscopy system for detecting trace analytes in vapor samples. The system uses a spectrometer in communications with control electronics, wherein the control electronics contain an analyte database that contains absorption profiles for each analyte the system is used to detect. The system can not only detect the presence of specific analytes, but identify them as well. The spectrometer uses a hollow cavity waveguide that creates a continuous loop inside of the device, thus creating a large path length and eliminating the need to mechanically adjust the path length to achieve a high Q-factor. In a preferred embodiment, the laser source may serve as the detector, thus eliminating the need for a separate detector.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: July 7, 2015
    Assignee: EMX International, LLC
    Inventors: Daniel Lee Graybeal, Alan Carey Rogers
  • Patent number: 9071034
    Abstract: The invention relates to a laser device comprising at least three linear laser gain volumes (12) for a gas to be excited, connecting elements (20) for connecting adjacent laser gain volumes, the laser gain volumes being mechanically coupled to other, and forming a common volumetric space, excitation means (50) for the laser gain volumes for exciting the gas in the laser gain volumes for generating a laser light, mirrors (22) arranged in the connecting elements for reflecting laser light between the laser gain volumes, a totally reflecting rear mirror (44), and a partially reflecting output coupler (42) for coupling out a laser beam. The laser gain volumes are arranged in the shape of an open or closed ring surrounding a free central space (8) between them. The invention also relates to a method for marking an object.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: June 30, 2015
    Assignee: ALLTEC ANGEWANDTE LASERLICHT TECHNOLOGIE GMBH
    Inventors: Kevin L. Armbruster, Brad D. Gilmartin, Peter J. Kueckendahl, Bernard J. Richard, Daniel J. Ryan
  • Patent number: 9019998
    Abstract: A tunable fiber ring laser with a gain clamped semiconductor optical amplifier is a ring laser source working at room temperature. The laser has an inner cavity disposed inside an outer cavity. A pair of circulators disposed in the inner cavity is configured to assure counter-propagation of light between the inner cavity and the outer cavity. A gain-clamped semiconductor optical amplifier (GC-SOA) is formed by combining a semiconductor optical amplifier (SOA) and a fixed filter in conjunction with the pair of circulators. A Fiber Fabry-Perot Tunable Filter (FFP-TF) is disposed in the outer cavity and connects to the pair of circulators via a polarization controller and a fused coupler.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: April 28, 2015
    Assignee: King Fahd University of Petroleum and Minerals
    Inventor: Khurram Karim Qureshi
  • 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: 9008133
    Abstract: A normal-dispersion fiber laser is operated using parameters in which dissipative solitons exist with remarkably large pulse duration and chirp, along with large pulse energy. A low-repetition-rate oscillator that generates pulses with large and linear chirp can thus replace the standard oscillator, stretcher, pulse-picker and preamplifier in a chirped-pulse fiber amplifier.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: April 14, 2015
    Assignee: Cornell University
    Inventors: William Henry Renninger, Frank W. Wise
  • Patent number: 8995054
    Abstract: An apparatus for generating a pulse train with an adjustable time interval is provided. The apparatus, being an annular optical cavity structure, includes a seed source receiving end, a pump source receiving end, an optical coupler, an optical combiner, a gain fiber, an optical path time regulator and a beam splitter. Thus, the apparatus is capable of generating a pulse train with an adjustable time interval to increase material processing quality and speed.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: March 31, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Yao-Wun Jhang, Hsin-Chia Su, Chien-Ming Huang, Shih-Ting Lin, Chih-Lin Wang, Chieh Hu
  • Publication number: 20150071321
    Abstract: A high energy semiconductor laser capable of high optical efficiency includes a master oscillator coupled to a plurality of slave oscillators, each producing a laser beam that is substantially at the same wavelength as the output beam from the master oscillator. The outputs of the slave oscillators are then coherently combined to a single monochromatic beam having an optical power which is substantially greater than that of beam output from the master oscillator. The slave oscillators can be configured as ring resonators. A suitable ring oscillator can be built by arranging one or more semiconductor diode laser gain media, two or more reflecting mirrors, and at least one semireflective mirror in a ring configuration. A suitable ring oscillator can also be built by machining a solid block to include one or more semiconductor diode laser high gain regions.
    Type: Application
    Filed: November 3, 2010
    Publication date: March 12, 2015
    Inventors: Peter Moshchansky-Livingston, Richard A. Hutchin
  • Patent number: 8964803
    Abstract: A light source apparatus includes a laser oscillator equipped with a first optical resonator, a plurality of second optical resonators including input portions respectively connected in parallel to the first optical resonator, a plurality of light extraction units configured to extract a light beam from an output portion of each second optical resonator, and a light multiplexing unit configured to multiplex the light beam extracted from each light extraction unit, wherein the light source apparatus causes the light multiplexing unit to output a multiplexed light beam passed through the plurality of second optical resonators, an optical member having refractive index dispersion and an optical amplification medium are disposed in each of the plurality of second optical resonators, and the optical amplification media of the plurality of second optical resonators are different from each other in maximum gain wavelength.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: February 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohiro Yamada, Kentaro Furusawa
  • Patent number: 8964802
    Abstract: A ring laser-resonator generating plane-polarized fundamental-frequency radiation includes an optically nonlinear crystal configured for type-II second-harmonic generation of fundamental-frequency radiation. The resonator is configured such that fundamental-frequency radiation circulating either clockwise or counter-clockwise therein makes two passes through the optically nonlinear crystal per round-trip in the resonator in opposite directions, with polarization planes perpendicular to each other. This arrangement forces unidirectional circulation of radiation in the resonator during which second-harmonic radiation is not generated by the crystal.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: February 24, 2015
    Assignee: Coherent, Inc.
    Inventor: Andrea Caprara
  • Publication number: 20150030041
    Abstract: System and method for operating a single unit of light-amplifying medium, structured to produce light with a complex spatial spectrum including multitude of high-order spatial modes, in external cavity configured, in conjunction with an optical etalon installed intra-cavity, to reduce spatial spectrum of such light to provide an output containing smaller number of high-order spatial modes and, optionally, only the lowest spatial mode at power levels on the order of 1 W or higher (for example, tens or hundreds of Watts).
    Type: Application
    Filed: July 23, 2014
    Publication date: January 29, 2015
    Inventor: Mieng Pai
  • Patent number: 8934507
    Abstract: In at least one embodiment, a wavelength-tunable light source includes at least one fiber-based partial section and at least one delay section. For a wavelength ? of at least one portion of a radiation emitted by the light source as a function of time t, the relationship ?(t)=?(t??) holds true. In this case, ? is a specific period of time. Furthermore, the delay section includes one or more oligomode fibers.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: January 13, 2015
    Assignee: Ludwig-Maximilians-Universitaet Muenchen
    Inventors: Robert Alexander Huber, Wolfgang Wieser, Thomas Klein
  • Publication number: 20150010035
    Abstract: A laser includes an active ring, a passive waveguide, and a reflector. The active ring is to generate light. The passive waveguide is associated with the active ring to capture generated light. The reflector is associated with the passive waveguide to cause captured light from the waveguide to be coupled into the active ring to trigger domination of unidirectional lasing in the active ring to generate light.
    Type: Application
    Filed: February 29, 2012
    Publication date: January 8, 2015
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Di Liang, David A. Fattal
  • Publication number: 20140369373
    Abstract: The invention relates to a two-stage laser system well fit for semiconductor aligners, which is reduced in terms of spatial coherence while taking advantage of the high stability, high output efficiency and fine line width of the MOPO mode. The two-stage laser system for aligners comprises an oscillation-stage laser (50) and an amplification-stage laser (60). Oscillation laser light having divergence is used as the oscillation-stage laser (50), and the amplification-stage laser (60) comprises a Fabry-Perot etalon resonator made up of an input side mirror (1) and an output side mirror (2). The resonator is configured as a stable resonator.
    Type: Application
    Filed: April 4, 2014
    Publication date: December 18, 2014
    Applicants: GIGAPHOTON INC., KOMATSU LTD.
    Inventors: Osamu WAKABAYASHI, Tatsuya ARIGA, Takahito KUMAZAKI, Kotaro SASANO
  • Patent number: 8908738
    Abstract: A laser device includes a pump source, a ring resonator, a gain medium disposed in the ring resonator, and a holographic output coupler to partially transmit the laser radiation. The gain medium is configured to receive radiation from the pump source and generate laser radiation.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: December 9, 2014
    Assignee: Physical Sciences, Inc.
    Inventor: Alex Dergachev
  • Patent number: 8908723
    Abstract: A widely tunable laser is described where a compound semiconductor gain chip is coupled to a waveguide filter fabricated on silicon. The filter has two resonators with different free-spectral-ranges, such that Vernier tuning between the filters can be used to provide a single wavelength of light feedback into the gain chip, where the wavelength is adjustable over a wide range. The coupling between the gain chip and the filter is realized through a microlens whose position can be adjusted using micromechanics and locked in place.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: December 9, 2014
    Inventors: Gideon Yoffe, John Heanue, Bardia Pezeshki
  • Patent number: 8897325
    Abstract: A fiber laser having a ring resonance path comprises a pump light source, a Yb-doped optical fiber and a light modulation unit. The pump light source emits a pump light. The Yb-doped optical fiber is coupled with the pump light. The light modulation unit includes a grating pair, a diaphragm and two reflective elements. The grating pair is coupled with the pump light. The diaphragm includes an aperture. The light transmitted by the grating pair partially passes through the aperture and reaches one of the reflective elements to become a reflective light, and the reflective light passes through the aperture and is transmitted through the grating pair and the other reflective element to be coupled back with the ring resonance path.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: November 25, 2014
    Assignee: National Tsing Hua University
    Inventors: Ci-Ling Pan, Alexey Zaytsev, Chih-Hsuan Lin, Yi-Jing You, Feng-Hua Tsai, Chi-Luen Wang
  • Patent number: 8891576
    Abstract: Unidirectionality of lasers is enhanced by forming one or more etched gaps (78, 80) in the laser cavity. The gaps may be provided in any segment of a laser, such as any leg of a ring laser, or in one leg (62) of a V-shaped laser (60). A Brewster angle facet at the distal end of a photonic device coupled to the laser reduces back-reflection into the laser cavity. A distributed Bragg reflector is used at the output of a laser to enhance the side-mode suppression ratio of the laser.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 18, 2014
    Assignee: Binoptics Corporation
    Inventors: Alex A. Behfar, Alfred T. Schremer, Jr., Cristian B. Stagarescu
  • Patent number: 8891577
    Abstract: A system and method for an electrically pumped laser system is disclosed. The system includes a silicon micro-ring resonator 405. A quantum well 412 formed of a III-V group semiconductor material is optically coupled with the micro-ring resonator 405 to provide optical gain. A trapezoidal shaped buffer 414 formed of a III-V group semiconductor material and doped with a first type of carrier is optically coupled to the quantum well 412. A ring electrode 410 is coupled to the trapezoidal shaped buffer 414. The trapezoidal shaped buffer 414 enables the ring electrode 410 to be substantially isolated from an optical mode of the micro-ring resonator 405.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: November 18, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Qianfan Xu, Marco Fiorentino, Raymond G. Beausoleil
  • Patent number: 8891566
    Abstract: A system and method for controllably chirping electromagnetic radiation from a radiation source includes an optical cavity arrangement. The optical cavity arrangement enables electromagnetic radiation to be produced with a substantially linear chirp rate and a configurable period. By selectively injecting electromagnetic radiation into the optical cavity, the electromagnetic radiation may be produced with a single resonant mode that is frequency shifted at the substantially linear chirp rate. Producing the electromagnetic radiation with a single resonant mode may increase the coherence length of the electromagnetic radiation, which may be advantageous when the electromagnetic radiation is implemented in various applications. For example, the electromagnetic radiation produced by the optical cavity arrangement may enhance a range, speed, accuracy, and/or other aspects of a laser radar system.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: November 18, 2014
    Assignee: Digital Signal Corporation
    Inventor: Kendall L. Belsley
  • Patent number: 8885685
    Abstract: According to one embodiment, a semiconductor light emitting device includes a first semiconductor layer and a laser resonator. The first semiconductor layer includes a first portion and a second portion juxtaposed with the first portion. The laser resonator is provided on the first portion and has a ring-shaped resonator structure circled along a major surface of the first semiconductor layer. The second portion guides light emitted from the laser resonator.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: November 11, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuya Ohira, Haruhiko Yoshida, Mizunori Ezaki
  • Patent number: 8885675
    Abstract: Provided is a wavelength variable laser device wherein an SOA is simplified. The wavelength variable laser device includes: an optical filter formed on a PLC; an SOA that supplies light to the optical filter; a light reflecting section that returns the light transmitted through the optical filter to the SOA via the optical filter; optical waveguides which are formed on the PLC and connect the SOA, the optical filter, and the light reflecting section; a wavelength variable section that changes a wavelength of the light transmitting through the optical filter; and a phase variable section that changes a phase of the light propagated on the optical waveguides.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: November 11, 2014
    Assignee: NEC Corporation
    Inventor: Hiroyuki Yamazaki
  • 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: 8848756
    Abstract: A surface plasmon laser includes a metal layer, a gain medium layer provided on the metal layer and having a circular structure portion in which a whispering gallery mode is generated in which surface plasmon light generated due to surface plasmon resonance on an interface with the metal layer rotates along a circle, and a deformed portion formed to output part of laser light generated in the circular structure portion of the gain medium layer.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: September 30, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-soong Lee, Un-jeong Kim, Young-geun Roh, Yeon-sang Park
  • Patent number: 8817839
    Abstract: The invention relates to a two-stage laser system well fit for semiconductor aligners, which is reduced in terms of spatial coherence while taking advantage of the high stability, high output efficiency and fine line width of the MOPO mode. The two-stage laser system for aligners comprises an oscillation-stage laser (50) and an amplification-stage laser (60). Oscillation laser light having divergence is used as the oscillation-stage laser (50), and the amplification-stage laser (60) comprises a Fabry-Perot etalon resonator made up of an input side mirror (1) and an output side mirror (2). The resonator is configured as a stable resonator.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: August 26, 2014
    Assignees: Komatsu Ltd., Gigaphoton Inc.
    Inventors: Osamu Wakabayashi, Tatsuya Ariga, Takahito Kumazaki, Kotaro Sasano
  • Patent number: 8809090
    Abstract: Devices for generating a laser beam are disclosed. The devices include a silicon micro ring having at least one silicon optical waveguide disposed at a distance from the micro ring. The radius and the cross-sectional dimension of the micro ring, the cross-sectional dimension of the waveguide, and the distance between the micro ring and the waveguide are determined such that one or more pairs of whispering gallery mode resonant frequencies of the micro ring are separated by an optical phonon frequency of silicon. Methods of manufacturing a lasing device including a silicon micro ring coupled with a silicon waveguide are also disclosed.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: August 19, 2014
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Xiaodong Yang, Chee Wei Wong
  • Patent number: 8798105
    Abstract: A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: August 5, 2014
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: John C. McCarthy, Katherine J. Snell, Christopher A. Miller
  • Patent number: 8756976
    Abstract: Embodiments of the present invention provide improved systems and methods for providing an atomic sensor device. In one embodiment, the device comprises a sensor body, the sensor body enclosing an atomic sensor, wherein the sensor body contains a gas evacuation site located on the sensor body, the gas evacuation site configured to connect to a gas evacuation device. The device also comprises a getter container coupled to an opening in the sensor body, an opening in the getter container coupled to an opening in the sensor body, such that gas within the sensor body can freely enter the getter container. The device further comprises an evaporable getter enclosed within the getter container, the evaporable getter facing away from the sensor body.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: June 24, 2014
    Assignee: Honeywell International Inc.
    Inventors: Christina M. Schober, Jennifer S. Strabley, Rodney H. Thorland, Chad Langness, Delmer L. Smith, Terry D. Stark
  • Patent number: 8750339
    Abstract: A ring laser includes a large-core rare-earth-doped fiber ring-connected with a free-space path having an electro-optic switch, output coupler, and intracavity band-pass filter to enforce lasing operation in narrow wavelength range. In some cavity-dumped modes, the laser is configured in a similar manner, except that an output coupler is omitted since the optical power is extracted from the laser cavity by the electro-optic switch itself. The same laser can be configured to operate in Q-switched and/or cavity-dumping modes as well as in hybrid modes (e.g., partial Q-switch, followed by cavity dumping, or even CW). In some embodiments, the laser can be used as, or inject laser light into, a regenerative solid-state amplifier, or a Raman laser, or can be also used to generate visible, ultra-violet, mid-infrared, and far-infrared (THz) radiation via nonlinear wavelength conversion processes. The various embodiments can use a power oscillator or seed-plus-amplifier MOPA configuration.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: June 10, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Fabio Di Teodoro, Tracy W. Vatter, Christopher D. Brooks, Robert W. Royse, Jr., Matthias P. Savage-Leuchs
  • Patent number: 8737446
    Abstract: A semiconductor laser includes a gain region; a distributed Bragg reflector (DBR) region including a diffraction grating; an end facet facing the DBR region with the gain region arranged therebetween; a first ring resonator including a first ring-like waveguide and a first optical coupler; a second ring resonator including a second ring-like waveguide and a second optical coupler; and an optical waveguide that is optically coupled to the end facet and extending in a predetermined optical-axis direction. The first and second ring resonators are optically coupled to the optical waveguide through the first and second optical couplers, respectively. Also, the DBR region, the gain region, and the end facet constitute a laser cavity. Further, the first ring resonator has a free spectral range different from a free spectral range of the second ring resonator.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: May 27, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Chie Fukuda
  • Patent number: RE45973
    Abstract: A semiconductor optical amplifier includes: a laminated structure sequentially including a first compound semiconductor layer composed of GaN compound semiconductor and having a first conductivity type, a third compound semiconductor layer having a light amplification region composed of GaN compound semiconductor, and a second compound semiconductor layer composed of GaN compound semiconductor and having a second conductivity type; a second electrode formed on the second compound semiconductor layer; and a first electrode electrically connected to the first compound semiconductor layer. The laminated structure has a ridge stripe structure. When widths of the ridge stripe structure in a light output end face and the ridge stripe structure in a light incident end face are respectively Wout, and Win, Wout>Win is satisfied. A carrier non-injection region is provided in an internal region of the laminated structure from the light output end face along an axis line of the semiconductor optical amplifier.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: April 12, 2016
    Assignees: SONY CORPORATION, TOHOKU UNIVERSITY
    Inventors: Masaru Kuramoto, Masao Ikeda, Rintaro Koda, Tomoyuki Oki, Hideki Watanabe, Takao Miyajima, Hiroyuki Yokoyama