Active Media With Particular Shape Patents (Class 372/66)
  • Patent number: 11031324
    Abstract: A semiconductor device includes a substrate, a plurality of solders, and a semiconductor chip. The plurality of solders are located adjacent to each other. At least one of composition and concentration of the plurality of solders is different from each other. The semiconductor chip includes a joining surface to be joined to the substrate with the plurality of solders. The joining surface of the semiconductor chip includes a plurality of joining areas in which heat generation of the semiconductor chip or a stress on an object to be joined is different from each other. The plurality of solders are disposed to correspond to the plurality of joining areas, respectively.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: June 8, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventor: Isao Oshima
  • Patent number: 10868406
    Abstract: A micro disk laser having a greater strength of oscillation in one direction than in another direction and unidirectionally oscillating includes a micro disk having an oval shape corresponding to a modified ellipse obtained by changing a length of a short axis of an ellipse according to a position of a long axis while lengths of first and second side portions of the long axis are fixed in the ellipse, the ellipse having the long axis and the short axis having a different length than the long axis.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: December 15, 2020
    Assignee: DAEGU GYEONGBUK INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventor: Chil Min Kim
  • Patent number: 10381795
    Abstract: The present invention relates to a microdisk laser having characteristics of unidirectional emission and an ultra-high quality factor and also a microdisk laser composed of four circular arcs and configured to emit light in one direction in a resonance mode having the form of a whispering gallery mode formed by total reflection.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: August 13, 2019
    Assignee: Daegu Gyeongbuk Institute of Science and Technology
    Inventor: Chil Min Kim
  • Patent number: 10367325
    Abstract: An active element slab for a laser source is presented. The active element slab includes at least one input surface of a pump beam, a first section in the shape of an elongated bar along a longitudinal axis that includes a first doped matrix configured to absorb the beam pump to amplify a laser beam travelling longitudinally, a second section that covers at least partially the first section, the second section that includes a second doped matrix configured to absorb the laser beam and of being transparent to the pump beam.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: July 30, 2019
    Assignee: COMPAGNIE INDUSTRIELLE DES LASERS CILAS
    Inventors: David Sabourdy, Jean-Eucher Montagne, Alexandre Martins-Santana, Luc Nguyen Duy
  • Patent number: 10243315
    Abstract: A solid-state optical amplifier chip is described, with improved pumping, in which pump light from one or more solid-state light sources is coupled efficiently into the doped areas of the chip, resulting in amplification of an optical signal. The optical signal is carried in the core of an optical waveguide. Rare-earth elements are used as dopants, primarily in the cladding of the optical signal's waveguide core, in order to provide amplification of the optical signal through stimulated emission. A variety of waveguide structures are described for routing and distributing the pump light to the doped areas of the chip.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: March 26, 2019
    Assignee: DICON FIBEROPTICS, INC.
    Inventors: Seng Fatt Liew, Ho-Shang Lee
  • Patent number: 9793676
    Abstract: A solid-state optical amplifier is described, having an active core and doped cladding in a single chip. An active optical core runs through a doped cladding in a structure formed on a substrate. A light emitting structure, such as an LED, is formed within and/or adjacent to the optical core. The cladding is doped, for example, with erbium or other rare-earth elements or metals. Several exemplary devices and methods of their formation are given.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: October 17, 2017
    Assignee: DICON FIBEROPTICS, INC.
    Inventor: Ho-Shang Lee
  • Patent number: 9515448
    Abstract: A microchip laser includes a microchip laser base comprising a gain region and a passive Q-switch region. The microchip laser also includes a solid etalon coupled to the microchip laser base, and an interfacial coating disposed between the microchip laser base and the solid etalon. In some embodiments, the microchip laser further includes a dichroic coating disposed on a surface of the microchip laser base opposite the interfacial coating.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: December 6, 2016
    Assignee: Raytheon Company
    Inventors: Robert D. Stultz, Juan Carlos Sotelo, David M. Filgas
  • Patent number: 9494425
    Abstract: A gyroscope having a mechanical resonator, a plurality of electrodes located around the resonator, and a thin gap being located between the resonator and the plurality of electrodes. The resonator is axi-symmetric and may be at least partially toroidal in shape or composed of concentric rings. Piezoelectric electrodes or transduction may be used to drive or detect displacements of the resonator. The resonator may be fabricated using a fused silica flowing process.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: November 15, 2016
    Assignee: The Regents of the University of Michigan
    Inventors: Khalil Najafi, Jae Yoong Cho
  • Patent number: 9263843
    Abstract: The patent refers to one or more droplets of chiral liquid crystals used as point source(s) of laser light. The source is shaped as a droplet of chiral liquid crystals (1) and an active medium preferably dispersed in the liquid crystals. The source is spherical and with a size of preferably between a few nanometres and 100 micrometres. A droplet consists of chiral liquid crystals (1) that have selective reflection in the range of the active medium's emission and can be cholesteric liquid crystals, a mixture of nematic liquid crystals and a chiral dopant or any other chiral liquid-crystal phase, preferably the blue phase, the ferroelectric phase, the antiferroelectric phase, any of the ferrielectric phases or another chiral phase of a soft substance, that need not be chiral by itself.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: February 16, 2016
    Assignee: INSTITUT JOZEF STEFAN
    Inventors: Igor Musevic, Matjaz Humar
  • Patent number: 9246300
    Abstract: A spherical laser includes a transparent or semi-transparent outer spherical vessel having an internal cavity, an amplifying medium in the cavity, and means to excite the amplifying medium. The sphere is provided with a partially reflective coating to act as a spherical optical resonator. The spherical resonator includes a plurality of optically different regions containing alternative optical media from the cavity medium differing in bulk optical parameters utilized for mode tailoring. The optically different regions work collectively to exclude the whispering gallery modes from those supported by the spherical cavity. Excitation of the amplifying medium produces an optical gain. When the gain exceeds cavity losses and threshold conditions are met, lasing is supported. This creates a three-dimensional, spherically radiating emission, emulating a point source. The sphere is enclosed within a mirrored ellipse to image the output to a point, or within a mirrored parabola to columinate the emission.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: January 26, 2016
    Inventor: Ronald LaComb
  • Publication number: 20150098483
    Abstract: A solid state laser includes an optical resonator cavity and a containment vessel disposed in the optical resonator cavity. The solid state laser also includes a gas-flow system operable to pump solid state nano-structures through the containment vessel and one or more diode pumps optically coupled to the containment vessel.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 9, 2015
    Applicant: Lawrence Livermore National Security, LLC
    Inventors: Raymond J. Beach, Mark D. Rotter
  • Patent number: 8908737
    Abstract: A laser includes a Ti:sapphire gain-medium in the form of a thin-disk. The thin-disk gain-medium is optically pumped by pump-radiation pulses having a wavelength in the green region of the electromagnetic spectrum. The pump-radiation pulses have a duration less than twice the excited-state lifetime of the gain-medium.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: December 9, 2014
    Assignee: Coherent, Inc.
    Inventors: Norman Hodgson, Michael Hertwig, H. Yang Pang
  • Patent number: 8837551
    Abstract: A method for generating high power electromagnetic radiation based on double-negative metamaterial (DNM), includes providing electrons of an electron beam moving in a vacuum close to an interface between the DNM and the vacuum at a predetermined average speed larger than a phase velocity of an electromagnetic wave propagating in the DNM so as to generate coherent high power radiation. The method can be applied but not limited to high power and compact Terahertz radiation sources and Cherenkov particle detectors and emitters.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: September 16, 2014
    Assignee: University of Electronic Science and Technology of China
    Inventors: Zhaoyun Duan, Xin Guo, Chen Guo, Yubin Gong, Min Chen
  • Patent number: 8811447
    Abstract: A semiconductor laser outputs a laser light from an output facet of a waveguide having an index waveguide structure, via a lens system. The waveguide includes, in order from a rear facet opposite to the output facet, a first narrow portion, a wide portion that is wider than the first narrow portion, a second narrow portion narrower than the wide portion, a first tapered portion formed between the first narrow portion and the wide portion, which expands toward the wide portion, and a second tapered portion formed between the wide portion and the second narrow portion, which narrows toward the second narrow portion. Each of the first narrow portion, the wide portion, and the second narrow potion has a uniform width.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: August 19, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Yutaka Ohki, Satoshi Arakawa, Shunsuke Okuyama, Masaki Funabashi
  • Patent number: 8767788
    Abstract: A semiconductor laser includes a ridge section on top of a semiconductor laminated section. The ridge section is a stripe-shaped projection or ridge and serves as a constriction structure for constricting current and light. A pair of terrace sections is located on top of the semiconductor laminated structure. The terrace sections are raised island portions sandwiching and spaced from the ridge section. An active region is located below the ridge section as viewed in plan. High refractive index regions are located on both sides of the active region and below the terrace sections, respectively. Cladding regions are located between the active region and the high refractive index regions. The high refractive index regions have a higher refractive index than the cladding regions.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: July 1, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kimio Shigihara
  • Patent number: 8731015
    Abstract: A compact CO2 slab-laser is contained in a fluid cooled housing having three compartments. One compartment houses discharge electrodes and a laser resonator. Another compartment houses a radio-frequency power supply (RFPS) assembled on a fluid-cooled chill plate and an impedance-matching network. The remaining compartment houses beam-conditioning optics including a spatial filter. The housing and RFPS chill-plate are on a common coolant-fluid circuit having a single input and a single output. The spatial filter is optionally fluid-coolable on the common coolant fluid circuit.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: May 20, 2014
    Assignee: Coherent, Inc.
    Inventors: Leon A. Newman, Adrian Papanide, Mathew David Rzewnicki, Thomas V. Hennessey, Jr.
  • Patent number: 8705586
    Abstract: To suppress the amplification of spontaneous emission light in a principal plane width direction to thereby suppress a gain in directions other than a beam axis direction and output a high-power laser, in a solid-state laser element of a plane waveguide type that causes a fundamental wave laser beam to oscillate in a beam axis direction in a laser medium of a flat shape and forms a waveguide structure in a thickness direction as a direction perpendicular to a principal plane of the flat shape in the laser medium, inclined sections 12 are provided on both sides of the laser medium, the inclined sections 12 inclining a predetermined angle to reflect spontaneous emission light in the laser medium to a principal plane side of the flat shape, the spontaneous emission light traveling in the beam axis direction and a principal plane width direction as a direction perpendicular to the thickness direction.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: April 22, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shuhei Yamamoto, Takayuki Yanagisawa, Yasuharu Koyata, Yoshihito Hirano
  • Patent number: 8687270
    Abstract: A main amplifier system includes a first reflector operable to receive input light through a first aperture and direct the input light along an optical path. The input light is characterized by a first polarization. The main amplifier system also includes a first polarizer operable to reflect light characterized by the first polarization state. The main amplifier system further includes a first and second set of amplifier modules. Each of the first and second set of amplifier modules includes an entrance window, a quarter wave plate, a plurality of amplifier slablets arrayed substantially parallel to each other, and an exit window. The main amplifier system additionally includes a set of mirrors operable to reflect light exiting the first set of amplifier modules to enter the second set of amplifier modules and a second polarizer operable to reflect light characterized by a second polarization state.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: April 1, 2014
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Kenneth R. Manes, Mary L. Spaeth, Alvin C. Erlandson
  • Patent number: 8660155
    Abstract: A laser system having a cooling apparatus is disclosed. The laser system includes a resonator, a gain medium and multiple heat-absorbing discs. The resonator is formed by a first mirror and a second mirror. The gain medium, which is contained within the resonator, is collectively formed by a group of gain medium segments. Each of the gain medium segments is preferably in the shape of a cylindrical disc. The heat-absorbing discs are interleavely disposed among the gain medium segments to provide face cooling for the gain medium segments during the operation of the laser system.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: February 25, 2014
    Assignee: BAE Systems Information and Electronics Systems Integration Inc.
    Inventor: Peter A. Ketteridge
  • Patent number: 8625194
    Abstract: A semiconductor optical amplifier includes an input-side optical amplifier waveguide section that has a first active core layer. An output-side optical amplifier waveguide section connects to the input-side optical amplifier waveguide section and has a second active core layer that is wider than the first active core layer. The width of the first active core layer and relative refractive index difference between the first active core layer and adjacent clad section in the width direction of the first active core layer, and the width of the second active core layer and relative refractive index difference between the second active core layer and adjacent clad section in the width direction of the second active core layer are set such that the carrier density and optical confinement factor in the first active core layer are higher than the carrier density and optical confinement factor in the second active core layer.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: January 7, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventor: Hideaki Hasegawa
  • Patent number: 8615029
    Abstract: A laser diode is configured with a substrate delimited by opposite AR and HR reflectors and a gain region. The gain region bridges the portions of the respective AR and HR reflectors and is configured with a main resonant cavity and at least one side resonant cavity. The main resonant cavity spans between the portions of the respective reflectors, and at least one additional resonant cavity extends adjacent to the main resonator cavity. The gain region is configured so that stimulated emission is generated only in the main resonant cavity. Accordingly, the laser diode is operative to radiate a high-power output beam emitted through the portion of the AR reflector which is dimensioned to shape the output beam with the desired near-field.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: December 24, 2013
    Assignee: IPG Photonics Corporation
    Inventors: Alexander Ovtchinnikov, Alexey Komissarov, Valentin P. Gapontsev, Pavel Trubenko
  • Patent number: 8599898
    Abstract: Slab lasers and method for producing high power coherent laser radiation of good quality. In one embodiment, a slab laser comprises a slab laser medium, an energy source configured to deliver energy to the laser medium, and first and second optical elements. The first optical element has a first reflective surface at a first boundary of the laser medium, and the second optical element has a second reflective surface at a second boundary of the laser medium. The first and second reflective surfaces face each other across the length of the laser medium, and at least one of the first and second optical elements includes a plurality of reflective regions configured to modify the phase distribution of the incident laser radiation propagating from the reflective regions. The first and second reflective surfaces are also positioned at an angle relative to each other to form a laser resonator.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: December 3, 2013
    Assignee: Universal Laser Systems, Inc.
    Inventors: Yefim P. Sukhman, Stefano J. Noto, Christian J. Risser, Mikhail E. Ryskin
  • Patent number: 8588268
    Abstract: A high power source of electro-magnetic radiation having a multi-purpose housing is disclosed. The multi-purpose housing includes an interior filled with a material forming at least a light source and further comprising a reflector which can envelope a laser rod surrounded by light sources for providing light excitation to the laser rod. A material defining outer surfaces of the light sources extends out to and defines outer surfaces of the reflector. A high-reflectivity coating is disposed over an outer surface of the reflector, as is a protective coating. Also disposed over an outer surface of the reflector can be an optional heat sink, with cooling being performed by an optional arrangement of forced-air traveling over the heat sink. The light sources may be light source pumps, and the high-reflectivity coating may be formed to envelop the reflector.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: November 19, 2013
    Assignee: Biolase, Inc.
    Inventors: Dmitri Boutoussov, Vladimir S. Netchitailo
  • Patent number: 8565276
    Abstract: A high power laser source comprises a bar of laser diodes having a first coefficient of thermal expansion CTEbar on a submount having a second coefficient CTEsub and a cooler having a third coefficient CTEcool. The submount/cooler assembly shows an effective fourth coefficient CTEeff differing from CTEbar. This difference leads to a deformation of the crystal lattice of the lasers' active regions by mechanical stress. CTEeff is selected to be either lower than both CTEbar and CTEcool or is selected to be between CTEbar and CTEcool. The submount may either comprise layers of materials having different CTEs, e.g., a Cu layer of 10-40 ?m thickness and a Mo layer of 100-400 ?m thickness, or a single material with a varying CTEsub. Both result in a CTEsub varying across the submount's thickness.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: October 22, 2013
    Inventors: Martin Krejci, Norbert Lichtenstein, Stefan Weiss, Julien Boucart, René Todt
  • Patent number: 8559479
    Abstract: The invention relates to a method for the production of a photon pair source, which generates entangled photon pairs, having at least one quantum dot, wherein in the method the operational behaviour of the photon pair source is determined by adjusting the fine structure splitting of the excitonic energy level of the at least one quantum dot. It is provided according to the invention for the fine structure splitting of the excitonic energy level to be adjusted by depositing the at least one quantum dot on a {111} crystal surface of a semiconductor substrate.
    Type: Grant
    Filed: July 20, 2009
    Date of Patent: October 15, 2013
    Assignee: Technische Universitat Berlin
    Inventors: Momme Winkelnkemper, Andrei Schliwa, Dieter Bimberg
  • Patent number: 8542712
    Abstract: An optical system (31) with an input optical source (33) for projecting an input beam along an optical axis and an optical element (37, 43) which creates a cone refracted beam (41) from the input beam (35) then reconstructs the input beam (49). The optical element may comprise a first cone refractive element (37) which creates a cone refracted beam and reconstructs the beam using a reconstructing optical element (43) to apply a phase shift to the cone refracted beam. The optical system may be used to form a laser or a gain medium for a laser.
    Type: Grant
    Filed: January 21, 2010
    Date of Patent: September 24, 2013
    Assignee: University of Dundee
    Inventors: Edik Rafailov, Amin Abdolvand, Todor Kalkandjiev
  • Patent number: 8509588
    Abstract: An amplifying optical fiber includes a core containing oxides of elements selected from the group consisting of silicon, germanium, phosphorus, bismuth, aluminum, gallium with a concentration of bismuth oxide of 10-4-5 mol %, a total concentration of silicon and germanium oxides of 70-99.8999 mol %, a total concentration of aluminum and gallium oxides of 0.1-20 mol % wherein both aluminum and gallium oxide are present and a ratio of aluminum oxide to gallium oxide is at least two, and a concentration of phosphorus oxide from 0 to 10 mol %, and provides a maximum optical gain at least 10 times greater than the nonresonant loss factor in the optical fiber. An outside oxide glass cladding comprises fused silica. The core has an absorption band in the 1000 nm region, pumping to which region provides an increased efficiency of power conversion of pump light into luminescence light in the 1000-1700 nm range.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: August 13, 2013
    Assignee: Fiber Optics Research Center of The Russian Academy of Sciences
    Inventors: Evgeny Mikhailovich Dianov, Vladislav Vladimirovich Dvoirin, Valery Mikhailovich Mashinsky, Alexei Nikolaevich Guryanov, Andrei Alexandrovich Umnikov
  • Patent number: 8494023
    Abstract: A composite optical waveguide 1 includes a first optical waveguide 9 comprising a silica-based core and a second optical waveguide 11 comprising an Si-based core. The second optical waveguide 11 is joined to the first optical waveguide 9. The length of the first optical waveguide 9 corresponds to a permissible propagation loss of the second optical waveguide 11. The second optical waveguide 11 includes a sharply curved portion 13 having a radius smaller than the minimum bend radius of the first optical waveguide 9.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: July 23, 2013
    Assignee: NEC Corporation
    Inventors: Hiroyuki Yamazaki, Hirohito Yamada
  • Patent number: 8457171
    Abstract: A laser amplifier arrangement includes an optical pump source and an axially arranged laser oscillator-amplifier configuration pumped by the pump radiation. The laser oscillator-amplifier configuration includes a laser oscillator excitable by a portion of the pump radiation to emit a laser beam, and a laser amplifier that amplifies the laser beam using the pump radiation. The laser oscillator and laser amplifier are arranged in a substantially coaxial or collinear manner relative to a longitudinal axis of the laser oscillator-amplifier configuration. The pump source includes a first beam source for producing a first pump radiation to pump the laser oscillator, a second beam source for producing a second pump radiation for the laser amplifier, and a pump radiation conducting device, by means of which both the first and the second pump radiation can be lead into the laser oscillator-amplifier configuration substantially in the direction of the longitudinal axis for longitudinal pumping.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: June 4, 2013
    Assignee: EADS Deutschland GmbH
    Inventors: Peter Peuser, Willi Platz
  • Patent number: 8442088
    Abstract: Optical resonators and optical devices based on optical resonators that implement diffractive couplers for coupling light with the optical resonators.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: May 14, 2013
    Assignee: OEwaves, Inc.
    Inventors: Vladimir Ilchenko, Anatoliy Savchenkov, Lutfollah Maleki
  • Patent number: 8422529
    Abstract: A tunable laser light source having emission wavelengths in a visible or an adjoining spectral region includes a rotationally disposed laser substrate having more than one emission wavelength, a drive unit coupled to the laser substrate, a pulsed light source having a pulse transmitter, a trigger device, and a signal-delay unit. The trigger device, the signal-delay unit and the pulse transmitter are sequentially connected downstream of the drive unit.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: April 16, 2013
    Assignee: Karlsruher Institut Fuer Technologie
    Inventors: Thomas Woggon, Soenke Klinkhammer, Sebastian Valouch, Johannes Bach, Uli Lemmer
  • Patent number: 8320419
    Abstract: A high power laser source comprises a bar of laser diodes having a first coefficient of thermal expansion CTEbar on a submount having a second coefficient CTEsub and a cooler having a third coefficient CTEcool. The submount/cooler assembly shows an effective fourth coefficient CTEeff differing from CTEbar. This difference leads to a deformation of the crystal lattice of the lasers' active regions by mechanical stress. CTEeff is selected to be either lower than both CTEbar and CTEcool or is selected to be between CTEbar and CTEcool. The submount may either comprise layers of materials having different CTEs, e.g., a Cu layer of 10-40 ?m thickness and a Mo layer of 100-400 ?m thickness, or a single material with a varying CTEsub. Both result in a CTEsub varying across the submount's thickness.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: November 27, 2012
    Assignee: Oclaro Technology Limited
    Inventors: Martin Krejci, Norbert Lichtenstein, Stefan Weiss, Julien Boucart, René Todt
  • Patent number: 8275015
    Abstract: Disclosed herein are systems and methods for generating a side-pumped passively Q-switched non-planar ring oscillator. The method introduces a laser into a cavity of a crystal, the cavity having a round-trip path formed by a reflection at a dielectrically coated front surface, a first internal reflection at a first side surface of the crystal at a non-orthogonal angle with the front, a second internal reflection at a top surface of the crystal, and a third internal reflection at a second side surface of the crystal at a non-orthogonal angle with the front. The method side pumps the laser at the top or bottom surface with a side pump diode array beam and generates an output laser emanating at a location on the front surface. The design can include additional internal reflections to increase interaction with the side pump. Waste heat may be removed by mounting the crystal to a heatsink.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: September 25, 2012
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Steven X. Li
  • Publication number: 20120237261
    Abstract: A surface emitting laser includes a stepped structure having a step between a first region and a second region, the stepped structure provided in an emission area located in an upper portion of the upper mirror. The surface emitting laser includes a light shielding member provided in a third region between the first region and the second region. The light shielding member is not provided in a portion of the first region and a portion of the second region.
    Type: Application
    Filed: March 7, 2012
    Publication date: September 20, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Mitsuhiro Ikuta, Aihiko Numata
  • Patent number: 8259772
    Abstract: A method of producing a lasing microsource of colloidal nanocrystals. The method includes the steps of preparing a nanocrystal solution in a solvent; depositing at least a drop of the nanocrystals solution with a drop volume below 1 nl on a flat substrate; and evaporating the solvent to dryness thereby to obtain at the edge of the evaporated drop a single annular stripe including a domain wherein the nanocrystals are arranged in an ordered array, wherein the ordered nanocrystals in the domain constitute an active region capable of lasing and the radially inner and outer edges of the stripe define a resonant cavity in which the active region is inserted.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: September 4, 2012
    Assignee: Fondazione Istituto Italiano di Technologia
    Inventors: Roman Krahne, Liberato Manna, Margherita Zavelani-Rossi, Guglielmo Lanzani, Salvatore Girardo, Dario Pisignano, Maria Grazia Lupo
  • Patent number: 8259391
    Abstract: The present invention relates to an amplification device comprising an amplifying medium (2) of parallelepiped shape and pumping means comprising lamps (5) emitting first radiation in a frequency range useful for the amplification and second radiation capable of degrading the amplifying medium. It is characterized in that lamps (5) are integrated into a jacket (3) that absorbs at least some of the second radiation.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: September 4, 2012
    Assignee: Thales
    Inventor: Stéphane Branly
  • Publication number: 20120201265
    Abstract: A method of producing a lasing microsource of colloidal nanocrystals. The method includes the steps of preparing a nanocrystal solution in a solvent; depositing at least a drop of the nanocrystals solution with a drop volume below 1 nl on a flat substrate; and evaporating the solvent to dryness thereby to obtain at the edge of the evaporated drop a single annular stripe including a domain wherein the nanocrystals are arranged in an ordered array, wherein the ordered nanocrystals in the domain constitute an active region capable of lasing and the radially inner and outer edges of the stripe define a resonant cavity in which the active region is inserted.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 9, 2012
    Applicant: FONDAZIONE ISTITUTO ITALIANO DI TECNOLOGIA
    Inventors: Roman KRAHNE, Liberato MANNA, Margherita ZAVELANI-ROSSI, Guglielmo LANZANI, Salvatore GIRARDO, Dario PISIGNANO, Maria Grazia LUPO
  • Patent number: 8238399
    Abstract: A laser amplifier includes a laser active slab with a source of pump power to amplify an input laser beam, the laser active slab including a block of laser active material having opposed lateral faces defining a wedge lateral dihedral angle, opposed longitudinal faces, and opposed parallel transverse faces, the wedge lateral dihedral angle specified to minimize parasitic amplified spontaneous emission. The source of pump power may be one or more laser diode bars and microlenses producing a gain sheet in the laser active slab. The lateral faces may include optical coatings highly transmitting at a wavelength of the pump power and highly reflecting at a lasing wavelength to provide a folded path for the input laser beam though the gain sheet.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: August 7, 2012
    Inventor: Jeffrey G. Manni
  • Publication number: 20120082179
    Abstract: An optical system (31) with an input optical source (33) for projecting an input beam along an optical axis and an optical element (37, 43) which creates a cone refracted beam (41) from the input beam (35) then reconstructs the input beam (49). The optical element may comprise a first cone refractive element (37) which creates a cone refracted beam and reconstructs the beam using a reconstructing optical element (43) to apply a phase shift to the cone refracted beam. The optical system may be used to form a laser or a gain medium for a laser.
    Type: Application
    Filed: January 21, 2010
    Publication date: April 5, 2012
    Applicant: THE UNIVERSITY OF DUNDEE
    Inventors: Edik Rafailov, Amin Abdolvand, Todor Kalkandjiev
  • Patent number: 8040931
    Abstract: A method of fabricating a color laser, comprising growing a first thin layer of ionic crystal on a substrate. The crystal can comprise many types of ionic crystals, such as sodium chloride or potassium chloride. A second thin layer of a different type of ionic crystal can be deposited above the first ionic crystal layer, such as lithium fluoride or sodium fluoride. An inert metal layer can be deposited between the first and second layers of ionic crystal and above the second layer of ionic crystal. When the first and second ionic crystal layers are radiated with gamma rays, they form color centers at the spots radiated. Because of the difference in crystalline properties of the two different ionic crystal centers, their color centers have different wavelengths. Each of the ionic crystal layers emit light at different characteristic wavelengths when illuminated at their unique absorption frequencies, and can be made to lase separately.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: October 18, 2011
    Assignee: Kulite Semiconductor Products, Inc.
    Inventors: Anthony D. Kurtz, Joseph R. VanDeWeert
  • Publication number: 20110222572
    Abstract: A laser arrangement includes an optical resonator having a V arrangement of two resonator branches. At least one active medium includes an active volume associated with each resonator branch. The arrangement also includes folding element that is highly reflective for a fundamental wavelength of the laser arrangement and an optical pump imaging system configured to unidirectionally pump the two resonator branches. The optical pump imaging system includes a common objective lens for both resonator branches. The folding element is transparent for the pump wavelength.
    Type: Application
    Filed: February 23, 2011
    Publication date: September 15, 2011
    Applicant: LPKF LASER & ELECTRONICS AG
    Inventors: Gennadij Kusnezow, Andreas Boenke
  • Patent number: 7961771
    Abstract: A laser amplifier includes a laser active slab with a source of pump power to amplify an input laser beam, the laser active slab including a block of laser active material having opposed lateral faces defining a wedge lateral dihedral angle specified to minimize parasitic amplified spontaneous emission. The laser amplifier may include one or more external mirrors highly reflecting at the lasing wavelength positioned and oriented to provide for zig-zag passes through the gain sheet for the input laser beam to yield a multi-pass-amplified laser beam. The source of pump power may be one or more laser diode bars and microlenses producing a gain sheet in the laser active slab.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: June 14, 2011
    Inventor: Jeffrey G. Manni
  • Publication number: 20110134945
    Abstract: A solid state laser device with a lengthened pump beam path is provided herein. The laser device includes an active element having a specified geometric shape, specified optical characteristics, and further configured for lasing; and a light pumping element optically coupled to the active element, wherein the light pumping element is configured to generate a pump light beam directed at a specified angle into the active element, and wherein at least one of: the specified angle, the specified geometric shape, and the specified optical characteristics are selected such that the pump light beam is reflected one or more times within the active element resulting in an extension of an absorption path of the pump light beam within the active element.
    Type: Application
    Filed: December 22, 2010
    Publication date: June 9, 2011
    Applicant: ELBIT SYSTEMS ELECTRO-OPTICS ELOP LTD.
    Inventors: Yaniv VIDNE, Nissim ZAFRANI, Shmuel GREENSTEIN, Dov ABRAMOVICH, Yoav LAVON
  • Patent number: 7940829
    Abstract: The basic gain medium enclosure for laser devices comprises two parallel lateral mirrors which geometrically define the extent of the gain medium enclosure and which allow the formation of lateral stationary sinusoidal waves.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: May 10, 2011
    Inventor: Lulian Petrescu-Prahova
  • Patent number: 7929589
    Abstract: Optical resonators and optical devices based on optical resonators that implement diffractive couplers for coupling light with the optical resonators.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: April 19, 2011
    Assignee: OEwaves, Inc.
    Inventors: Vladimir Ilchenko, Anatoliy Savchenkov, Lutfollah Maleki
  • Publication number: 20110075687
    Abstract: A laser comprises an end pump light source and a gain medium having a first end, a second end, and four sides comprising a first, a second, a third, and a fourth side. The end pump light source is optically coupled to the first end and pumps the gain medium. The first side and the third side are tapered inwardly from the first end to the first end to the second end at a taper angle ? relative to a longitudinal lasing axis and have a polished finish capable of reflecting light inside the gain medium. The second side and the fourth side are substantially parallel to the longitudinal lasing axis have a ground blasted finish. The first side is also tilted inwardly at a slant angle ? from the fourth side to the second side. A laser beam R0 exits the second end of the gain medium.
    Type: Application
    Filed: March 26, 2010
    Publication date: March 31, 2011
    Applicant: INNOVA, INC.
    Inventor: M. Cem Gokay
  • Patent number: 7907655
    Abstract: A laser cavity structure is disclosed which pertains to laser resonator geometries possessing circular symmetry, such as in the case of disk or spherical lasers. The disclosed invention utilizes a very-high finesse Bragg reflector (VHF-BR) thin film reflectors of many layer pairs of very small refractive index difference, the VHF-BR deposited on a surface of revolution, thereby forming an optical cavity. These dielectric reflectors are disposed in such a way as to allow selection of preferred low order modes and suppression of parasitic modes while allowing a high cavity Q factor for preferred modes. The invention disclosed, in its preferred embodiments, is seen as particularly useful in applications requiring high efficiency in the production and coupling of coherent radiation. This is accomplished in a cavity design that is relatively compact and economical.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: March 15, 2011
    Inventor: Donald Bennett Hilliard
  • Patent number: 7894496
    Abstract: A novel method and apparatus for suppressing ASE and/or parasitic oscillation modes in a laser is introduced. By roughening one or more peripheral edges of a solid-state crystal or ceramic laser gain media and by bonding such edges to a predetermined electromagnetic absorbing material arranged adjacent to the entire outer surface of the peripheral edges of the roughened laser gain media, ASE, parasitic oscillation modes and/or residual pump energy can be effectively suppressed.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: February 22, 2011
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Lloyd A. Hackel, Thomas F. Soules, Scott N. Fochs, Mark D. Rotter, Stephan A. Letts
  • Patent number: 7869481
    Abstract: A high power solid-state non-regenerative optical amplification system (100) for amplifying a pulsed optical beam, includes a first optical amplification crystal (C1) and a second optical amplification crystal (C2) for amplifying the optical beam; optical pumping elements for longitudinal pumping amplification crystals (C1, C2); reflective optical elements (M?1, M?2, . . . , M?17) suitable for reflecting the optical beam so that the optical beam makes a total number of N sequential passes through the amplification crystals (C1, C2), wherein N is an integer and N>4. The reflective optical elements (M?1, M?2, . . . , M?17) are placed in a configuration suitable for alternatively interleaving the sequential optical beam passes through the 1st crystal (C1) and through the 2nd crystal (C2). A solid-state laser including the amplification system, and a method for amplifying a pulsed optical beam in a two-crystal multi-pass non-regenerative amplification system are also disclosed.
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: January 11, 2011
    Assignee: Amplitude Technologies
    Inventors: Luc Vigroux, Pierre-Mary Paul, Fabien Ple
  • Publication number: 20100322279
    Abstract: There is provided a light source apparatus including at least a excitation light source and a photocoupler, a light source medium formed of one kind of a single, rare-earth element doped fiber that is excited by the excitation light source and has two terminals, and an output end formed of an optical fiber, the light source apparatus being characterized in that an optical component having at least one of reflection, branching or attenuation function is provided in anywhere of an optical circuit from the light source medium to the output terminal and that it is possible to output lights of different wavelengths derived from different spontaneous emission light peaks that are generated from rare-earth element ions added to the rare-earth element doped fiber, and that at least one of the lights to be obtained is visible light.
    Type: Application
    Filed: March 1, 2007
    Publication date: December 23, 2010
    Applicant: CENTRAL GLASS COMPANY, LIMITED
    Inventors: Takuya Teshima, Yoshinori Kubota