Q-switch Patents (Class 372/10)
  • Patent number: 11165214
    Abstract: Method and systems are disclosed for generating amplified output laser pulses with individually predefined pulse energies at individually predefined times at an output by providing a pulse sequence of input laser pulses having the same pulse energy and the same temporal pulse interval smaller than the temporal pulse interval between two adjacent output laser pulses, selecting the input laser pulses that arrive at the output at or about the predefined times, amplifying the selected input laser pulses with an optical amplifier, wherein at least one sacrificial laser pulse is inserted into the pulse sequence of the selected input laser pulses before the subsequent one of the two successive input laser pulses to be amplified, and reducing the pulse energies of the amplified input laser pulses to predefined pulse energies by time-controlled partial decoupling depending on their pulse intervals from the corresponding immediately preceding amplified input or sacrificial laser pulse.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: November 2, 2021
    Assignee: TRUMPF LASER GMBH
    Inventors: Rainer Flaig, Stefan Rapp, Fred Stier
  • Patent number: 11070021
    Abstract: A seed unit (MO) includes a plurality of optical paths sharing a part thereof and causing light to be resonated thereon, an amplification optical fiber (13) serving as a part of each of the optical paths and amplifying respective light beams resonated on the respective optical paths, and; an AOM (14) arranged at a part shared by the respective optical paths and switchable between a first state, in which the AOM (14) vibrates at a predetermined cycle and emits light incident from the optical paths to the optical paths, and a second state, in which the AOM (14) emits light incident from the optical paths to a path other than the optical paths. A resonance cycle of light having highest power out of the light beams resonated on the optical paths and the predetermined cycle at which the AOM (14) vibrates in the first state have a non-integral multiple relationship.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: July 20, 2021
    Assignee: FUJIKURA LTD.
    Inventors: Ren Suzuki, Naoki Murakoshi
  • Patent number: 10944233
    Abstract: A fiber-laser includes a gain-fiber in a laser-resonator. A polarizer is located in the laser-resonator at an end thereof, causing the output of the fiber-laser to be linearly polarized. A wavelength-selective element is also included in the laser-resonator for selecting an output wavelength of the fiber-laser from within a gain-bandwidth of the gain-fiber.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: March 9, 2021
    Assignee: Coherent, Inc.
    Inventors: Qi-Ze Shu, Andrea Caprara
  • Patent number: 10886698
    Abstract: A laser source for emitting radiation in a given emission spectral band, centered on a given emission angular frequency, the central emission angular frequency is provided. The laser source comprises a laser cavity comprising a gain section having a known frequency dependent Group Delay Dispersion, and a GTI mirror arranged at one end of the gain section, having a known frequency dependent Group Delay Dispersion. The gain section and the GTI mirror are formed into a same laser medium, the laser medium having a known frequency dependent Group Delay Dispersion, and the gain section and the GTI mirror are separated by a gap of predetermined width filled with a dielectric medium thus forming a two parts laser cavity. Further, the GTI GDD at least partly compensates the sum of the Gain GDD and the material GDD in the emission spectral band.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: January 5, 2021
    Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, SORBONNE UNIVERSITÉ, UNIVERSITE PARIS DIDEROT—PARIS 7, ECOLE NORMALE SUPERIEURE
    Inventors: Sukhdeep Dhillon, Hanond Nong, Feihu Wang, Tobias Fobbe, Nathan Jukam
  • Patent number: 10777961
    Abstract: Methods, devices, and apparatus for generating plasma or laser pulses by radio frequency (RF) excitation pulses are provided. In one aspect, a method includes specifying radio frequency (RF) excitation pulses at least partially as a function of a preceding RF excitation of a medium and outputting a signal to a RF pulse generator, the signal configured to cause the RF pulse generator to generate the specified RF excitation pulses for exciting the medium to generate plasma or laser pulses. The RF excitation pulses is specified to become more strongly reduced in energy when a remaining excitation of the medium by the preceding RF excitation is higher.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: September 15, 2020
    Assignee: TRUMPF Laser—und Systemtechnik GmbH
    Inventors: Robert Schulz, Torsten Beck
  • Patent number: 10756503
    Abstract: The present disclosure relates to an optical waveguide system. The system may include a first waveguide having a core-guide and a material portion surrounding and encasing the core-guide. The core-guide enables a core-guide mode for an optical signal travelling through the core-guide. A second waveguide forms a lossy waveguide on an outer surface of the first waveguide. The construction of the second waveguide is such as to achieve a desired coupling between the core-guide mode and the lossy waveguide to control an energy level of the optical signal travelling through the core-guide.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: August 25, 2020
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Eyal Feigenbaum, Graham S. Allen, Jay W. Dawson, Mikhail A. Noginov
  • Patent number: 10644476
    Abstract: A MOPA laser system that includes a seed laser configured to output pulsed laser light, an amplifier configured to receive and amplify the pulsed laser light emitted by the seed laser; and a pump laser configured to deliver a pump laser beam to both the seed laser and the amplifier and a variable attenuator configured to eliminate missing Q-switched pulses.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: May 5, 2020
    Assignee: Candela Corporation
    Inventors: Jayant D. Bhawalkar, Xiaoming Shang
  • Patent number: 10638594
    Abstract: A compact, small foot print, light source based on electron beam acceleration for insertion devices in EUV range metrology and actinic mask inspection using coherent scattering methods includes spiral storage rings providing plane straight sections. A magnet structure generates emittance for brilliance and coherent light content. A booster feeds the storage ring by top-up injection and keeps electron beam intensity stable. A booster level below the storage ring receives the electron beam from a linear accelerator in a central booster area. The source fits into laboratories or maintenance areas. Injection, RF-acceleration, beam manipulating devices and large diagnostics systems are required once. Higher average currents stored in the spiral enhance central cone power. Bunches are limited by ion trapping and a gap clears ions. The current is increased in the spiral. Gain in central cone power increases 5 fold, assuming a gap size of half single storage ring circumference.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: April 28, 2020
    Assignee: Paul Scherrer Institut
    Inventors: Leonid Rivkin, Andreas Streun, Albin Wrulich
  • Patent number: 10622780
    Abstract: A microchip laser and a handpiece including the microchip laser. The microchip laser includes a laser medium with input and output facets. The input facet is coated with a highly reflective dielectric coating at microchip laser wavelength and highly transmissive at pump wavelength. The output facet is coated with a partially reflective at microchip laser wavelength dielectric coating. A saturable absorber attached by intermolecular forces to output facet of microchip laser. A handpiece for skin treatment includes the microchip laser.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: April 14, 2020
    Assignee: Candela Corporation
    Inventors: Xiaoming Shang, Christopher J. Jones, Zhi Huang
  • Patent number: 10559938
    Abstract: A Laser system is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one individual pulse of a temporally limited pulse duration (T0) is generated, wherein the pulse ablates a material such that a debris cloud forms above the ablated material. Further, the pump power of the pump is modulated in such a way that the following three conditions are fulfilled: (1) the intensity of the pulse oscillates between maximum values and minimum values during the pulse duration, wherein the laser pulse comprises a plurality of intensity maxima Imax which occur at times {Ti, i=1, . . . N}; and a plurality of intensity minima Imin which occur at times {tk, k=1, . . .
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: February 11, 2020
    Assignee: Fotona d.o.o.
    Inventors: Marko Marincek, Janko Nendl, Matjaz Mocnik, Lukac Matjaz
  • Patent number: 10520741
    Abstract: A system for separating plasma pumping light and collected broadband light includes a pump source configured to generate pumping illumination including at least a first wavelength, a gas containment element for containing a volume of gas, a collector configured to focus the pumping illumination from the pumping source into the volume of gas to generate a plasma within the volume of gas, wherein the plasma emits broadband radiation including at least a second wavelength and an illumination separation prism element positioned between a reflective surface of the collector and the pump source and arranged to spatially separate the pumping illumination including the first wavelength and the emitted broadband radiation including at least a second wavelength emitted from the plasma.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: December 31, 2019
    Assignee: KLA-Tencor Corporation
    Inventors: Anatoly Shchemelinin, Ilya Bezel, Matthew Panzer, Eugene Shifrin
  • Patent number: 10483714
    Abstract: The present disclosure relates a laser arrangement (1) and a method of the laser arrangement, arranged to output energy in the form of laser emission, for emitting controlled Q-switched laser emission. The laser arrangement comprises a gain medium (2) arranged to be excited when pumped, an optical resonator (3), an active Q-switch (4) arranged in the optical resonator, said active Q-switch (4) being controllable between at least a high loss state and a low loss state, and being arranged to introduce loss in the optical resonator to prevent lasing in the high loss state and to affect lasing minimally in the low loss state, a photo detector (5) arranged to detect the presence of a free running pulse (1?) generated by the optical resonator and which occurs when a lasing threshold is reached and a processing circuitry (6) arranged to control (S4) of the state of the active Q-switch based on the detection of the free running pulse.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: November 19, 2019
    Assignee: SAAB AB
    Inventors: Peter Bane, Marcus Gustafsson
  • Patent number: 10454236
    Abstract: A laser system includes a first laser source with a laser resonator for generating a first pulsed laser beam. The resonator has a back mirror, an outcoupling mirror and an active lasing medium in between. The system includes a second laser source for generating a second pulsed laser beam and an optical block. The optical block includes a coupling polarizer and a first polarization rotator. The optical block is movable back and forth between an active position and a passive position. In its active position the optical block is located between the outcoupling mirror and the active lasing medium such that the coupling polarizer couples the second beam into the laser resonator of the first laser source while the first rotator is positioned between the outcoupling mirror and the coupling polarizer. In the active position of the optical block a second polarization rotator is between it and the back mirror.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: October 22, 2019
    Assignee: Fotona d.o.o.
    Inventors: Dejan Skrabelj, Kranjec Jozica, Matjaz Lukac
  • Patent number: 10361534
    Abstract: A semiconductor light source is disclosed. In an embodiment a semiconductor light source includes at least one semiconductor laser configured to generate a primary radiation and at least one coupling-out element comprising a continuous base region and rigid light guide columns extending away from the base region, the light guide columns acting as waveguides for the primary radiation, wherein the primary radiation is irradiated into the base region during operation, is led through the base region to the light guide columns and is directionally emitted from the light guide columns so that an intensity half-value angle of the emitted primary radiation is at most 90°.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: July 23, 2019
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Bernhard Stojetz, Alfred Lell, Christoph Eichler, Andreas Löffler
  • Patent number: 10345604
    Abstract: An optical fiber for converting a Gaussian laser beam into a Bessel laser beam may include a first segment optically coupled to a second segment with a transition region, the first segment having a first outer diameter greater than a second outer diameter of the second segment. The first segment may include a first core portion with a first cladding portion extending around the first core portion. The first core portion may have an annular core region with a relative refractive index relative to the first cladding portion. The second segment may include a second core portion with a second cladding portion extending around the second core portion. The second core portion has a relative refractive index relative to the second cladding portion and the relative refractive index of the first annular core region may be substantially equal to the relative refractive index of the second core portion.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: July 9, 2019
    Assignee: Corning Incorporated
    Inventors: Ming-Jun Li, Anping Liu
  • Patent number: 10323460
    Abstract: Systems, apparatus and methods for performing laser operations in boreholes and other remote locations, such operations including laser drilling of a borehole in the earth. Systems, apparatus and methods for generating and delivering high power laser energy below the surface of the earth and within a borehole. Laser operations using such downhole generated laser beams.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: June 18, 2019
    Assignee: Foro Energy, Inc.
    Inventors: Brian O. Faircloth, Ian Lee, Andrey Kuznetsov
  • Patent number: 10274671
    Abstract: A fiber structural body includes a first fiber, and a second fiber spliced to the first fiber such that light having propagated through the first fiber propagates through the second fiber. At least one of the fibers is a photonic crystal fiber. The second fiber is coated with a first coating layer and a second coating layer in order from a splice surface, and the first coating layer has a refractive index n1 larger than that of a clad layer of the second fiber. In the fiber structural body, L, r, n1, and NA satisfy a particular relationship.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: April 30, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideo Iwase, Yukihiro Inoue
  • Patent number: 10241261
    Abstract: A fiber structural body includes a first fiber, and a second fiber spliced to the first fiber such that light having propagated through the first fiber propagates through the second fiber. At least one of the fibers is a photonic crystal fiber. The second fiber is coated with a first coating layer and a second coating layer in order from a splice surface, and the first coating layer has a refractive index n1 larger than that of a clad layer of the second fiber. In the fiber structural body, L, r, n1, and NA satisfy a particular relationship.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: March 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideo Iwase, Yukihiro Inoue
  • Patent number: 10175565
    Abstract: A system and method for controlling the energy of light pulses for use with a projection optics system is provided. The system includes a light source configured to emit light pulses, a transmission element configured to transmit a first part and a second part of an active light pulse, the first part being transmitted to the projection optics system, and a feedback system including a detector configured to receive the second part of the active light pulse and determine a total measure of energy of the active light pulse, and a control unit configured to receive the total measure of energy and in response control an amplitude of a subsequent light pulse. In some implementations, the control unit may additionally set a threshold value for communication to a comparator to compare against the total measure of energy and in response control the width of the active light pulse.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: January 8, 2019
    Assignee: CHRISTIE DIGITAL SYSTEMS USA, INC.
    Inventor: Michael Perkins
  • Patent number: 10170885
    Abstract: A current control device supplies a current to a semiconductor laser in order to output laser light to the semiconductor laser, and includes a current commander and a supplier. The current commander outputs a command value corresponding to a current value by increasing the command value with a lapse of time until reaching a target command value corresponding to a current value for outputting the laser light with a predetermined strength. The supplier supplies a current with a size corresponding to the command value output by the current commander to the semiconductor laser.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: January 1, 2019
    Assignee: MITUTOYO CORPORATION
    Inventors: Hidekazu Oozeki, Toshiaki Matsuura
  • Patent number: 10164401
    Abstract: A method is disclosed for generating a sub-nanosecond pulse laser, using a voltage-increased type electro-optical Q-switched laser. The method includes: applying a square wave driving signal on a Pockels cell in an electro-optical Q-switched laser by using a Q-switch driver module, where the peak voltage of the square wave driving signal is higher than the quarter-wave voltage of the Pockels cell; and performing, by controlling the loss related to the electro-optical Q switch with a voltage of the driving signal increasing from 0 to the peak voltage, a change of the working state of the electro-optical Q switch from a switched-off state to a switched-on state, and then to a partially-switched-on state. The intracavity laser is exhausted within a quite short time, so that the pulse width of the laser is shortened, to implement sub-nanosecond operation of a pulse laser.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: December 25, 2018
    Assignee: Shanxi University
    Inventors: Kuanshou Zhang, Xin Zhao, Yuanji Li, Jinxia Feng
  • Patent number: 10153607
    Abstract: A passive Q-switch laser has an excitation source 1 for outputting excitation light; a laser medium 3 between a pair of reflective mirrors 5a, 5b that constitute part of an optical resonator, the laser medium emitting laser light upon being excited by the excitation light from the excitation source: a saturable absorber 4 disposed between the pair of reflective mirrors, the saturable absorber being configured such that the transmittance thereof increases as the laser light beam the laser medium is absorbed, a matrix table 22 in which the excitation-source output and the optimal value of the pulse width are stored in association with the repetition frequency; and a control unit 21 for referring to the matrix table, reading out the excitation-source output and the optimal value of the pulse width that correspond to an inputted repetition frequency, and controlling the excitation source such that the read-out excitation-source output and optimal value of the pulse width are attained.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: December 11, 2018
    Assignee: SHIMADZU CORPORATION
    Inventors: Rakesh Bhandari, Koji Tojo, Naoya Ishigaki, Shingo Uno
  • Patent number: 10153610
    Abstract: A laser source (100) is intended for a device for interacting simultaneously with several atomic species within time intervals which are common to these species. The laser source includes a laser radiation generating set (1), an optical amplifier (2), and a frequency doubler set (3). A component for time-division multiplexing (5) assign in alternation at successive time sub-intervals, initial radiations corresponding to interaction radiations dedicated to different atomic species. The result of the interactions with one of the atomic species is then identical to the result of the interactions with a continuous radiation dedicated to the atomic species.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: December 11, 2018
    Assignee: ONERA (OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES)
    Inventors: Yannick Bidel, Nassim Zahzam, Alexandre Bresson
  • Patent number: 10139702
    Abstract: A wavelength conversion device having an excitation source 1, a laser medium 3 between an input mirror 5a and an output mirror 5b, consisting of an optic resonator. A laser beam is excited by the excitation light from the excitation source; a saturable absorber 4 is between the input mirror and the output mirror and increases a transmittance along with an absorption of the laser beam from the laser medium. A wavelength conversion element converts a fundamental wave of the laser light from the output mirror to a higher harmonic. A control element generates a phase-matched signal to adjust the phase-matching between the fundamental wave and the higher harmonic based on the output from the wavelength conversion element and the laser output setting value, and controls the laser output by outputting the phase-matched signal to the wavelength conversion element.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: November 27, 2018
    Assignee: SHIMADZU CORPORATION
    Inventors: Rakesh Bhandari, Koji Tojo, Naoya Ishigaki, Shingo Uno
  • Patent number: 10120162
    Abstract: An apparatus and a method for cooling a digital mirror device are disclosed. For example, the apparatus includes a digital mirror device (DMD), a thermal pad, wherein a first side of the thermal pad is coupled to a bottom of a housing of the DMD and a cooling block coupled to a second side of the thermal pad that is opposite the first side. The cooling block includes a plate that includes a plurality of openings that generates a liquid jet of a liquid that is forced through the plurality of openings towards a side of the cooling block coupled to the thermal pad.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: November 6, 2018
    Assignee: Xerox Corporation
    Inventors: Francisco Zirilli, Michael B. Monahan, Jeffrey John Bradway
  • Patent number: 10095084
    Abstract: A solid-state laser system may include: a solid-state laser unit configured to output first pulsed laser light with a first wavelength and second pulsed laser light with a second wavelength; a first solid-state amplifier configured to receive the first pulsed laser light, and output third pulsed laser light with the first wavelength; a wavelength converter configured to receive the third pulsed laser light, and output harmonic light with a third wavelength; a second solid-state amplifier configured to receive the second pulsed laser light, and output fourth pulsed laser light with the second wavelength; a Raman laser unit configured to receive the fourth pulsed laser light, and output Stokes light with a fourth wavelength; and a wavelength conversion system configured to receive the harmonic light and the Stokes light, and output fifth pulsed laser light with a fifth wavelength converted in wavelength from the third wavelength and the fourth wavelength.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: October 9, 2018
    Assignees: The University of Tokyo, Gigaphoton Inc.
    Inventors: Yohei Kobayashi, Shinji Ito
  • Patent number: 10094707
    Abstract: An optical attenuator has a sampling prism, a biconcave lens and an absorption member. A branch member splits a laser beam. An expansion member expands the shape of the split laser beam. The absorption member absorbs the energy of the expanded laser beam. A light receiving part of the absorption member receives the expanded laser beam. A first distribution part of the absorption member adjacent to the light receiving part, introduces or leads out a medium (cooling water) from a first opening and distributes the medium, which absorbs heat generated in the light receiving part by the laser beam. A second distribution part of the absorption member leads out or introduces cooling water from a second opening, and distributes the cooling water, which moves through a communicating part that communicates with the first distribution part.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: October 9, 2018
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Naoyuki Morimiya, Naoyuki Torii, Naoki Okamoto, Naoya Yoshida, Tsuneo Saito
  • Patent number: 10096963
    Abstract: An apparatus (such as a laser-based system) and method for providing optical pulses in a broad range of pulse widths and pulse energies uses a pulse slicer which is configured to slice a predefined portion having a desired pulse width of each of the one or more output optical pulses from a laser oscillator, in which timings of a rising edge and a falling edge of each sliced optical pulse relative to a time instance of a maximum of the corresponding each of the one or more output optical pulses from the laser oscillator, are chosen at least to maximize amplification efficiency of the optical amplifier, which may be located after the pulse slicer, and to provide the one or more amplified output optical pulses each having the desired pulse energy and pulse width.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: October 9, 2018
    Assignee: LUMENIS LTD.
    Inventor: John B. Lee
  • Patent number: 10041878
    Abstract: A method for measuring and determining a THz spectrum of a sample (17) having an improved spectral resolution. Two laser beams (1a, 2a) are superimposed, such that two parts (11, 12) of a superimposed laser radiation are generated, which have a beat frequency in the THz range. The first part (11) is introduced into an emitter (13) for generating a THz radiation (14), which passes through the sample. The characteristic transmission radiation (18) thus obtained is forwarded to a detector (15), which is activated by the second part (12) of the superimposed laser radiation. By repetition with different beat frequencies, a measurement signal I(f) of the form I(f)=A(f)·cos [?(f)] is obtained for the sample. An auxiliary signal ?(f) shifted by 90° is determined from the measurement signal I(f), with ?(f)=A(f)·cos [?(f)±90°]. The THz spectrum S(f) of the sample is determined by the auxiliary signal ?(f), with S(f)=|z(f)|=|I(f)+i?(f)|.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: August 7, 2018
    Assignee: Bruker Optik GmbH
    Inventors: Christian Hepp, Stephan Luettjohann
  • Patent number: 10038296
    Abstract: A light amplifier according to an aspect of the present invention includes: a seed light source configured to generate a pulsing seed light; an excitation light source configured to generate excitation light; a light amplifying fiber configured to amplify the seed light by the excitation light and output the amplified light; and a control unit configured to control the seed light source and the excitation light source. The control unit has a mode to control the excitation light's power such that as a set value of a pulse width of the amplified light increases, the amplified light's peak energy increases within a threshold value at a minimum set value of the pulse width.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: July 31, 2018
    Assignee: OMRON CORPORATION
    Inventors: Hiroshi Fukui, Tadamasa Yokoi, Tatsuo Ogaki, Shuichi Tani, Tatsunori Sakamoto, Yuichi Ishizu
  • Patent number: 9946015
    Abstract: A fiber structural body includes a first fiber, and a second fiber spliced to the first fiber such that light having propagated through the first fiber propagates through the second fiber. At least one of the fibers is a photonic crystal fiber. The second fiber is coated with a first coating layer and a second coating layer in order from a splice surface, and the first coating layer has a refractive index n1 larger than that of a clad layer of the second fiber. In the fiber structural body, L, r, n1, and NA satisfy a particular relationship.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: April 17, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hideo Iwase, Yukihiro Inoue
  • Patent number: 9923329
    Abstract: An apparatus, method and system that uses a Q-switched laser or a Q-seed source for a seed pulse signal having a controlled high-dynamic-range amplitude that avoids and/or compensates for pulse steepening in high-gain optical-fiber and/or optical-rod amplification of optical pulses. Optionally, the optical output is used for LIDAR or illumination purposes (e.g., for image acquisition). In some embodiments, well-controlled pulse shapes are obtained having a wide dynamic range, long duration, and not-too-narrow linewidth. In some embodiments, upon the opening of a Q-switch in an optical cavity having a gain medium, the amplification builds relatively slowly, wherein each round trip through the gain medium increases the amplitude of the optical pulse. Other embodiments use quasi-Q-switch devices or a plurality of amplitude modulators to obtain Q-seed pulses.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: March 20, 2018
    Assignee: Lockheed Martin Corporation
    Inventors: Matthias P. Savage-Leuchs, Christian E. Dilley, Charles A. Lemaire
  • Patent number: 9908200
    Abstract: The present invention generally relates to an optical system that is able to reliably deliver a uniform amount of energy across an anneal region contained on a surface of a substrate. The optical system is adapted to deliver, or project, a uniform amount of energy having a desired two-dimensional shape on a desired region on the surface of the substrate. Typically, the anneal regions may be square or rectangular in shape. Generally, the optical system and methods of the present invention are used to preferentially anneal one or more regions found within the anneal regions by delivering enough energy to cause the one or more regions to re-melt and solidify.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: March 6, 2018
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Bruce E. Adams, Samuel C. Howells, Dean Jennings, Jiping Li, Timothy N. Thomas, Stephen Moffatt
  • Patent number: 9905992
    Abstract: In one embodiment, a lidar system includes a self-Raman laser that includes a Raman-active gain medium and a Q-switch. The self-Raman laser is configured to: produce Q-switched pulses of light at a lasing wavelength of the self-Raman laser; Raman-shift, in the Raman-active gain medium, at least a portion of the Q-switched pulses to produce Raman-shifted pulses of light, where the Raman-shifted pulses have a Raman-shifted wavelength that is longer than the lasing wavelength; and emit at least a portion of the Raman-shifted pulses. The lidar system further includes a scanner configured to scan the emitted pulses of light across a field of regard and a receiver configured to detect at least a portion of the scanned pulses of light scattered by a target located a distance from the lidar system. The lidar system also includes a processor configured to determine the distance from the lidar system to the target.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: February 27, 2018
    Assignee: LUMINAR TECHNOLOGIES, INC.
    Inventors: David Welford, Martin A. Jaspan, Jason M. Eichenholz, Scott R. Campbell, Lane A. Martin, Matthew D. Weed
  • Patent number: 9880351
    Abstract: The present invention relates to optical transmitters, transceivers, and transponders used for transmission of information or data in any form through a physical medium dependent (PMD) network. The speed of such networks depends, in part, on the density of information that can be transmitted through the physical medium. Optical transmitters or transceivers can be used to transmit multiple independent signals simultaneously through the same medium using different directions or axes of polarization, where the difference in the directions or axes of polarization can be used to distinguish the multiple signals at the receiver. In this invention, we use a master laser (l0) to synchronize two slave lasers (l1 and l2) by its x-polarization and y-polarization components of carrier, respectively, so that two slave lasers can be enforced to lock on exactly the same wavelength l0 with perpendicular polarization directions.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: January 30, 2018
    Assignee: ZTE (USA) Inc.
    Inventors: Hung-Chang Chien, Zhensheng Jia, Jianjun Yu
  • Patent number: 9843156
    Abstract: A fiber laser, null coupler acoustic Q-switch, fiber amplifier and feedback system is described for generation of high power laser pulses.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: December 12, 2017
    Assignee: Soreq Nuclear Research Center
    Inventors: Sharone Goldring, Bruno Sfez
  • Patent number: 9843065
    Abstract: The present invention concerns a battery including an anode case, an anode situated inside the anode case, a cathode case fixed to the anode case, a seal sealing the cathode case to the anode case, a cathode situated inside the cathode case between the anode and the cathode case, and a membrane between the anode and the cathode, said battery being characterized in that one outer surface of said accumulator includes at least one marking created by local heating of material, said marking being electrically conductive.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: December 12, 2017
    Assignee: The Swatch Group Research and Development Ltd
    Inventors: Yves Burri, Michael Stalder, Jean-Claude Martin
  • Patent number: 9825421
    Abstract: Provided is a single pulse laser apparatus. The apparatus including a resonator having a first mirror, a second mirror, a gain medium, and electro-optic modulators (EOMs) which perform each mode-locking and Q-switching, the apparatus includes a photodiode which measures laser light that oscillates from the resonator, a synchronizer which converts an electrical signal generated by measuring the laser light into a transistor-transistor logic (TTL) signal, a delay unit which sets a latency determined in order to synchronize a mode-locked pulse with a Q-switched pulse to the TTL signal, and outputs a trigger TTL signal according to the latency, and a Q-driver which inputs the trigger TTL signal to the EOM which performs Q-switching, and causes the EOM to operates.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: November 21, 2017
    Assignee: Korea Institute of Science and Technology
    Inventors: Young Min Jhon, Joon Mo Ahn, Seok Lee, Jae Hun Kim, Min Ah Seo, Chul Ki Kim, Taik Jin Lee, Deok Ha Woo, Min Chul Park
  • Patent number: 9810775
    Abstract: In one embodiment, a lidar system includes a Q-switched laser configured to emit pulses of light, where the Q-switched laser includes a gain medium and a Q-switch. The lidar system further includes a scanner configured to scan the emitted pulses of light across a field of regard and a receiver configured to detect at least a portion of the scanned pulses of light scattered by a target located a distance from the lidar system. The lidar system also includes a processor configured to determine the distance from the lidar system to the target based at least in part on a round-trip time of flight for an emitted pulse of light to travel from the lidar system to the target and back to the lidar system.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: November 7, 2017
    Assignee: Luminar Technologies, Inc.
    Inventors: David Welford, Martin A. Jaspan, Jason M. Eichenholz, Scott R. Campbell, Lane A. Martin, Matthew D. Weed
  • Patent number: 9784173
    Abstract: A laser ignition device for an internal combustion engine, in which the laser ignition device has at least one laser spark plug and a cooling device for temperature control, in particular cooling, of the laser spark plug. The cooling device has a cooling circuit, containing a coolant, which is thermally connectable to at least one component of the laser spark plug, a volume of the coolant contained in the cooling circuit being less than or equal to approximately 50% of a compression volume of a cylinder of the internal combustion engine, which may be less than or equal to approximately 10% of a compression volume of the cylinder of the internal combustion engine.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: October 10, 2017
    Assignee: Robert Bosch GmbH
    Inventor: Klaus Stoppel
  • Patent number: 9762023
    Abstract: Online calibration of laser performance as a function of the repetition rate at which the laser is operated is disclosed. The calibration can be periodic and carried out during a scheduled during a non-exposure period. Various criteria can be used to automatically select the repetition rates that result in reliable in-spec performance. The reliable values of repetition rates are then made available to the scanner as allowed values and the laser/scanner system is then permitted to use those allowed repetition rates.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: September 12, 2017
    Assignees: CYMER, LLC, ASML NETHERLANDS B.V.
    Inventors: Joshua Jon Thornes, Tanuj Aggarwal, Kevin Michael O'Brien, Frank Everts, Herman Philip Godfried, Russell Allen Burdt
  • Patent number: 9762028
    Abstract: A two-section semiconductor laser includes a gain section and a modulation-independent grating section to reduce chirp. The modulation-independent grating section includes a diffraction grating for reflecting light and forms a laser cavity with the gain section for lasing at a wavelength or range of wavelengths reflected by the diffraction grating. The gain section of the semiconductor laser includes a gain electrode for driving the gain section with at least a modulated RF signal and the grating section includes a grating electrode for driving the grating section with a DC bias current independent of the modulation of the gain section. The semiconductor laser may thus be directly modulated with the modulated RF signal without the modulation significantly affecting the index of refraction in the diffraction grating, thereby reducing chirp.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: September 12, 2017
    Assignee: Applied Optoelectronics, Inc.
    Inventors: Jun Zheng, Stefan Murry, Klaus Alexander Anselm, Huanlin Zhang, Dion McIntosh-Dorsey
  • Patent number: 9698560
    Abstract: A laser ignition system, in particular for an internal combustion engine, including a vertical emitter and a laser-active crystal, the laser-active crystal being doped in at least some areas using ytterbium, the ytterbium-doped area having a length of 200 ?m to 7000 ?m. The monolithic laser is based on a YAG or LuAG host crystal having 3 differently doped areas: a laser-active ytterbium-doped area, an undoped area which determines the resonator length and therefore the pulse duration, and a chromium-doped or vanadium-doped area for the passive Q-switch. The resonator is delimited by 2 mirrors.
    Type: Grant
    Filed: August 25, 2014
    Date of Patent: July 4, 2017
    Assignee: Robert Bosch GmbH
    Inventor: Heiko Ridderbusch
  • Patent number: 9680281
    Abstract: In a method, a laser pump module is set to a first power mode and pump energy is output at a first power level through the activation of a first subset of laser diodes. Laser light is emitted from a gain medium at the first power level in response to absorption of the pump energy. An operator input corresponding to a power mode setting is received. The laser pump module is switched to a second power mode and pump energy is output at a second power level through the activation of a second subset of the laser diodes. Laser light is emitted from the gain medium at the second power level in response to absorption of the pump energy.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: June 13, 2017
    Assignee: Boston Scientific Scimed, Inc.
    Inventors: Rongwei Jason Xuan, Michael R. Hodel, Douglas G. Stinson, Raymond Adam Nemeyer
  • Patent number: 9640940
    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: April 13, 2015
    Date of Patent: May 2, 2017
    Assignee: IMRA America, Inc.
    Inventors: Xinhua Gu, Mark Bendett, Gyu Cheon Cho, Martin E. Fermann
  • Patent number: 9620922
    Abstract: Disclosed is a lamp block comprising a lamp which is a glass tube having an internal final end and an external final end, wherein said internal final end ends with an electrode that fits directly into a connector placed on the machine into which said lamp is mounted and said external final end ends with an electrode to which a cable is connected, at least one portion of said cable being inserted in a key which is a hollow cylinder. Also disclosed is a laser apparatus suitable to house said lamp block and a method for extracting and housing said lamp block in said laser apparatus. In a preferred embodiment, said apparatus further comprise a system for electronic recognition.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: April 11, 2017
    Assignee: BIOS S.R.L.
    Inventors: Aldo Casalino, Lorenzo Casalino
  • Patent number: 9574541
    Abstract: A high efficiency optical ignition device is provided in a two-part compact and robust package to be mounted directly on an internal combustion engine chamber. The ignition device ignites a combustion fuel with a high intensity plasma generated by a high power laser beam from a solid state laser operable in Q-switched, or non-Q-switched mode for producing short or long pulses, respectively. Multiple pulses are generated, and duration and frequency of the laser beam pulses are controlled by controlling an optical pump module to pump the solid state laser. The optical pump module comprises a semiconductor laser, preferably a VCSEL device. One or more laser beams are precisely directed, each one to a desired location anywhere within the combustion chamber for more efficient and near complete burning of the combustion fuel. The robust packaging is well suited to withstand mechanical and thermal stresses of the internal combustion engine.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: February 21, 2017
    Assignee: PRINCETON OPTRONICS INC.
    Inventors: Chuni L Ghosh, Qing Wang, Bing Xu, Robert van Leeuwen
  • Patent number: 9570877
    Abstract: A device may include a transient optical amplifier having stored energy associated with a lower boundary and an upper boundary of a dynamic equilibrium, and a target level defining stored energy for amplifying a high energy input pulse to a higher energy output pulse. The device may include a pump to increase the amplifier's stored energy, and a source to pass low energy control pulses or the high energy input pulse to the amplifier. The device may include a controller configured to maintain the amplifier's stored energy in the dynamic equilibrium by requesting low energy control pulses for the amplifier at a high repetition frequency. The controller may wait to receive a trigger. Based on receiving the trigger, the device may stop passing low energy control pulses to the amplifier, and may pass the high energy input pulse to the amplifier when the amplifier's stored energy reaches the target level.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: February 14, 2017
    Assignee: Lumentum Operations LLC
    Inventors: Hubert Ammann, Marco Benetti
  • Patent number: 9543732
    Abstract: Disclosed is a laser wavelength conversion apparatus. The apparatus includes a focusing lens formed of a birefringent material and configured to have a same refractive index for an infrared laser beam and a green laser beam having different polarization directions and focus the infrared laser beam and the green laser beam without a chromatic aberration, and a sum frequency generator configured to combine the infrared laser beam and the green laser beam focused by the focusing lens to generate an ultraviolet laser beam. The apparatus of the present invention can solve a problem due to a chromatic aberration of the focusing lens, thereby improving a wavelength conversion efficiency and a beam quality.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: January 10, 2017
    Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Changsoo Jung, Young-Chul Noh, Bong-Ahn Yu, Woo Jin Shin, Yeung Lak Lee
  • Patent number: 9537280
    Abstract: The present invention discloses a dual beamsplitting element based excimer laser pulse stretching device comprising two beam splitting elements and one confocal resonator. The first beamsplitting element splits incident laser beam into two beams, one beam enters the confocal resonator, generates a certain time delay and then is incident on the second beamsplitting element, and the second beam is directly incident on the second beamsplitting element. The second beamsplitting element further splits each of the incident laser beams into two beams, one of the two beams enters the confocal resonator, generates a certain time delay and is returned back to the first beamsplitting element to be further split, and the other of the two beams is combined with other beams which are direct outputs after being split by the beamsplitting elements or being optically delayed by the confocal resonator to form a stretched output beam.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: January 3, 2017
    Assignee: The Institute of Optics and Electronics, The Chinese Academy of Sciences
    Inventors: Bincheng Li, Qiang Wang, Yanling Han