Frequency Multiplying (e.g., Harmonic Generator) Patents (Class 372/22)
  • Patent number: 10921246
    Abstract: There is provided a method of tuning a resonant cavity and a cavity ring-down spectroscopy system using the same. A first mirror is actuated at a first end of a resonant cavity to move in a direction between a first position relative to a second mirror at a second end of the resonant cavity, at which a cavity length between the first mirror and the second mirror is less than a resonance length for a laser beam, and a second position relative to the second mirror, at which the cavity length is greater than the resonance length. An event is triggered when the cavity length is proximal to the resonance length. The first mirror is continuously actuated in the direction between the first position and the second position during the event.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: February 16, 2021
    Assignee: PICOMOLE INC.
    Inventors: Christopher Quentin Purves, Perry F. Kain, Denis Dufour
  • Patent number: 10788369
    Abstract: An infrared detection system comprises the following elements. A laser source provides radiation for illuminating a target (5). This radiation is tuned to at least one wavelength in the fingerprint region of the infrared spectrum. A detector (32) detects radiation backscattered from the target (5). An analyser determines from at least the presence or absence of detected signal in said at least one wavelength whether a predetermined volatile compound is present. An associated detection method is also provided. In embodiments, the laser source is tunable over a plurality of wavelengths, and the detector comprises a hyperspectral imaging system. The laser source may be an optical parametric device has a laser gain medium for generating a pump beam in a pump laser cavity, a pump laser source and a nonlinear medium comprising a ZnGeP2 (ZGP) crystal.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: September 29, 2020
    Assignee: ITI SCOTLAND—SCOTTISH ENTERPRISE
    Inventors: Graeme Malcolm, Gordon Robertson
  • Patent number: 10734780
    Abstract: According to one embodiment, an optical device includes a first mirror, a second mirror, and a first member. The first mirror has a first planar surface. The second mirror is spaced from the first mirror in a first direction crossing the first planar surface. The second mirror has a concave surface including a first region and a second region around the first region. First distance between the first region and the first planar surface in the first direction is longer than second distance between the second region and the first planar surface in the first direction. The first distance is half or less of curvature radius of the concave surface. The first member is light transmissive and solid. The first member includes a first portion provided between the first mirror and the second mirror. The first portion is in contact with the first planar surface and the concave surface.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: August 4, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kouichi Ichimura
  • Patent number: 10723139
    Abstract: The invention describes a laser printing system (100) for illuminating an object moving relative to a laser module of the laser printing system (100) in a working plane (180), the laser module comprising at least two laser arrays of semiconductor lasers and at least one optical element, wherein the optical element is adapted to image laser light emitted by the laser arrays, such that laser light of semiconductor lasers of one laser array is imaged to one pixel in the working plane of the laser printing system, and wherein the laser printing system is a 3D printing system for additive manufacturing and wherein two, three, four or a multitude of laser modules (201, 202) are provided, which are arranged in columns (c1, c2) perpendicular to a direction of movement (250) of the object in the working plane (180), and wherein the columns are staggered with respect to each other such that a first laser module (201) of a first column of laser modules (c1) is adapted to illuminate a first area (y1) of the object and a
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: July 28, 2020
    Assignee: EOS GmbH Electro Optical Systems
    Inventors: Thomas Mattes, Stefan Paternoster, Gerd Cantzler, Jochen Philippi, Stephan Gronenborn, Gero Heusler, Holger Moench, Ralf Conrads
  • Patent number: 10584963
    Abstract: A method obtains the shape of a target by projecting and recording images of dual frequency fringe patterns. Locations in each projector image plane are encoded into the patterns and projected onto die target while images are recorded. The resulting images show the patterns superimposed onto the target. The images are decoded to recover relative phase values for the patterns primary and dual frequencies. The relative phases are unwrapped into absolute phases and converted back to projector image plane locations. The relation between camera pixels and decoded projector locations is saved as a correspondence image representing the measured shape of the target. Correspondence images with a geometric triangulation method create a 3D model of the target. Dual frequency hinge patterns have a low frequency embedded into a high frequency sinusoidal, both frequencies are recovered in closed form by the decoding method, thus, enabling direct phase unwrapping.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: March 10, 2020
    Assignee: BROWN UNIVERSITY
    Inventors: Gabriel Taubin, Daniel Moreno
  • Patent number: 10505336
    Abstract: A laser adjustment method includes a first adjustment step and a second adjustment step. In the first adjustment step, using a light detector detecting a second harmonic light, optical intensity and wavelength of the second harmonic light is detected and a first temperature adjuster is adjusted to adjust temperatures of a Nd:YVO4 crystal and a KTP crystal such that the detected wavelength of the second harmonic light approaches a desired wavelength and such that the optical intensity of the second harmonic light reaches at least a predetermined value. In the second adjustment step, after the first adjustment step, a temperature of an etalon is adjusted by a second temperature adjuster such that the detected wavelength of the second harmonic light approaches the desired wavelength and such that the optical intensity of the second harmonic light reaches at least a predetermined value.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: December 10, 2019
    Assignee: MITUTOYO CORPORATION
    Inventors: Tatsuya Narumi, Yoichi Toida
  • Patent number: 10403800
    Abstract: Systems including light-emitting diodes (LEDs) are provided. The systems include one or more wavelength-converting member(s) that is/are remote from the emission surface of one or more LED-based light source(s). The wavelength-converting member may be separated from the emission surface of a first LED and positioned such that light emitted from the first LED is absorbed by the wavelength-converting material. The wavelength-converting material emits secondary light having a different wavelength than the wavelength of the light emitted from the first LED. The systems may include a second light source comprising a second LED configured to emit light having a wavelength from an emission surface and a wavelength-combining element configured to combine the secondary light from the wavelength-converting member and the light emitted from the second light source to form a co-axial light beam.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: September 3, 2019
    Assignee: Luminus, Inc.
    Inventor: Jinhui Zhai
  • Patent number: 10317597
    Abstract: Various aspects of the present disclosure are directed toward optics and imaging. As may be implemented with one or more embodiments, an apparatus includes one or more phase masks that operate with an objective lens and a microlens array to alter a phase characteristic of light travelling in a path from a specimen, through the objective lens and microlens array and to a photosensor array. Using this approach, the specimen can be imaged with spatial resolution characteristics provided via the altered phase characteristic, which can facilitate construction of an image with enhanced resolution.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: June 11, 2019
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Noy Cohen, Marc S. Levoy, Michael J. Broxton, Logan Grosenick, Samuel Yang, Aaron Andalman, Karl A. Disseroth, Mark A. Horowitz
  • Patent number: 10281796
    Abstract: Disclosed is a nonlinear optical (NLO) material for use in deep-UV applications, and methods of fabrication thereof. The NLO is fabricated from a plurality of components according to the formula AqByCz and a crystallographic non-centrosymmetric (NCS) structure. The NLO material may be fabricated as a polycrystalline or a single crystal material. In an embodiment, the material may be according to a formula Ba3ZnB5PO14.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: May 7, 2019
    Assignee: UNIVERSITY OF HOUSTON SYSTEM
    Inventors: P. Shiv Halasyamani, Hongwei Yu
  • Patent number: 10270224
    Abstract: A semiconductor laser device is disclosed that includes a laser resonator situated to produce a laser beam, with the laser resonator including an angled distributed Bragg reflector (a-DBR) region including first and second ends defining an a-DBR region length corresponding to a Bragg resonance condition with the first end being uncleaved and including a first mode hop region having a first end optically coupled to the a-DBR region first end and extending a first mode hop region length associated with the a-DBR region length to a second end so as to provide a variable longitudinal mode selection for the laser beam.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: April 23, 2019
    Assignee: nLIGHT, Inc.
    Inventor: Manoj Kanskar
  • Patent number: 10270218
    Abstract: A laser device includes a light source that emits a source light having a first peak wavelength. A nonlinear optical component performs a frequency conversion process that converts the source light into output light having a second peak wavelength. A stabilization component minimizes a mismatch error constituting a difference between the first peak wavelength and a wavelength for which the frequency conversion process in the nonlinear optical component has a maximum value. The stabilization component may include a housing that is thermally conductive between the light source and the nonlinear optical component to minimize a temperature difference between the light source and the nonlinear optical component. The laser device may include a focusing optical component that focuses the source light to have a convergence half angle that is larger than a convergence half angle that gives maximum output power, thereby increasing an acceptable range of the mismatch error.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: April 23, 2019
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Karl Peter Welna, Edward Andrew Boardman, Tim Michael Smeeton, Valerie Berryman-Bousquet
  • Patent number: 10199149
    Abstract: A laser assembly for generating laser output light at an output wavelength of approximately 183 nm includes a fundamental laser, an optical parametric system (OPS), a fifth harmonic generator, and a frequency mixing module. The fundamental laser generates fundamental light at a fundamental frequency. The OPS generates a down-converted signal at a down-converted frequency. The fifth harmonic generator generates a fifth harmonic of the fundamental light. The frequency mixing module mixes the down-converted signal and the fifth harmonic to produce the laser output light at a frequency equal to a sum of the fifth harmonic frequency and the down-converted frequency. The OPS generates the down-converted signal by generating a down-converted seed signal at the down-converted frequency, and then mixing the down-converted seed signal with a portion of the fundamental light.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: February 5, 2019
    Assignee: KLA-Tencor Corporation
    Inventors: Yung-Ho Alex Chuang, J. Joseph Armstrong, Yujun Deng, Vladimir Dribinski, John Fielden, Jidong Zhang
  • Patent number: 10123906
    Abstract: A device for the exact manipulation of material, especially of organic material, includes a pulsed laser system with a radiation source, said radiation source being a cavity-dumped fs oscillator.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: November 13, 2018
    Assignee: CARL ZEISS MEDITEC AG
    Inventors: Michael Bergt, Manfred Dick
  • Patent number: 10129613
    Abstract: An optical switch includes a first optical absorbing layer sensitive to a first light and having a first superlattice structure and a first bandgap; a second optical absorbing layer sensitive to a second light and having a second bandgap smaller than that of the first bandgap; and a barrier layer having a second superlattice structure. The first optical absorbing layer, the second optical absorbing layer, and the barrier layer are arranged in a direction of an axis to form an arrangement with a first band-offset in a conduction band of the first optical absorbing layer, a second band-offset in a conduction band of the barrier layer, and a well in a conduction band of the second optical absorbing layer.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: November 13, 2018
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Sundararajan Balasekaran, Hiroshi Inada
  • Patent number: 10096965
    Abstract: Pulsed fiber lasers that amplify seed laser pulses include pump laser drivers that produce simmer currents during periods in which the seed pulse is suspended, and forward currents associated with steady state pulse amplification. By suitable selection of simmer currents, initiation of a series of seed pulses produces pulse-to-pulse output powers with suitable power variation.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: October 9, 2018
    Assignee: nLIGHT, Inc.
    Inventors: C. Geoffrey Fanning, Timothy N. Kutscha
  • Patent number: 10044166
    Abstract: A deep ultra-violet (DUV) continuous wave (CW) laser includes a fundamental CW laser configured to generate a fundamental frequency with a corresponding wavelength between about 1 ?m and 1.1 ?m, a third harmonic generator module including one or more non-linear optical (NLO) crystals that generate a third harmonic and an optional second harmonic, and a fifth harmonic generator. The fifth harmonic generator module includes a cavity resonant at the fundamental frequency, and combines the fundamental frequency with the third harmonic in a first NLO crystal to generate a fourth harmonic, then combines the fourth harmonic with unconsumed fundamental frequency in a second NLO crystal to generate the fifth harmonic. One or more lenses are used to focus the third and fourth harmonics in the first and second NLO crystals, respectively.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: August 7, 2018
    Assignee: KLA-Tencor Corporation
    Inventors: Yung-Ho Chuang, Xiaoxu Lu, John Fielden
  • Patent number: 10025085
    Abstract: The present application discloses image generation device for generating sample image representing sample. The image generation device includes laser source portion which emits laser beam, convertor for converting laser beam into multiplexed beam, in which reflected beam after reflection of laser beam by sample and reference beam after modulation of phase of the laser beam are multiplexed, first signal generator which generates first detection signal corresponding to light quantity of multiplexed beam, image generator which generates sample image, and modulator which modulates the phase to cause periodic variation of light quantity of multiplexed beam. The first detection signal includes signal component representing change from increase to decrease in the periodic variation. The image generator uses signal component to generate sample image.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: July 17, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Teruhiro Shiono, Keiichi Matsuzaki
  • Patent number: 9915562
    Abstract: A cavity-enhanced absorption spectroscopy instrument has an optical cavity with two or more cavity mirrors, one mirror of which having a hole or other aperture for injecting a light beam, and the same or another mirror of which being partially transmissive to allow exit of light to a detector. A spherical-spherical configuration with at least one astigmatic mirror or a spherical-cylindrical configuration where the spherical mirror could also be astigmatic prevents a reentrant condition wherein the injected beam would prematurely exit the cavity through the aperture. This combination substantially increases the number of passes of the injected beam through a sample volume for sensitive detection of chemical species even in less than ideal conditions including low power laser or LED sources, poor mirror reflectivity or detector noise at the wavelengths of interest, or cavity alignment issues such as vibration or temperature and pressure changes.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: March 13, 2018
    Assignee: ABB, INC.
    Inventors: John Brian Leen, Nathan E. Bramall
  • Patent number: 9882337
    Abstract: The present invention relates to a method for manufacturing a laser module, and a laser module package, and the method for manufacturing a laser module. Rapidity, accuracy and high reliability of the manufactured module can be obtained by aligning precisely using an automated equipment, and fixing components through laser welding.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: January 30, 2018
    Assignee: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
    Inventors: Hyung Man Lee, Soon Seob Park
  • Patent number: 9859676
    Abstract: A laser device includes a light source that emits a source light having a first peak wavelength. A nonlinear optical component performs a frequency conversion process that converts the source light into output light having a second peak wavelength. A stabilization component minimizes a mismatch error constituting a difference between the first peak wavelength and a wavelength for which the frequency conversion process in the nonlinear optical component has a maximum value. The stabilization component may include a housing that is thermally conductive between the light source and the nonlinear optical component to minimize a temperature difference between the light source and the nonlinear optical component. The laser device may include a focusing optical component that focuses the source light to have a convergence half angle that is larger than a convergence half angle that gives maximum output power, thereby increasing an acceptable range of the mismatch error.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 2, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Karl Peter Welna, Edward Andrew Boardman, Tim Michael Smeeton, Valerie Berryman-Bousquet
  • Patent number: 9746748
    Abstract: A method and apparatus is disclosed for generating tunable attosecond-scale radiation pulses, with a frequency in range of mid-infrared to ultra-violet, from a silicon medium. The invention utilizes an intense laser pulse to drive a high harmonic generation (HHG) process in a silicon medium and a weak secondary field to control the HHG process. The weak secondary field has a frequency equal to the second harmonic of the intense laser pulse. The spatial, temporal and spectral properties of the HHG process and the emitted harmonic beam are tuned by adjusting the relative delay between the two fields and the intensity of the weak secondary field.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: August 29, 2017
    Assignee: University of Ottawa
    Inventors: Giulio Vampa, Paul B. Corkum
  • Patent number: 9715970
    Abstract: An electric double-layer ultracapacitor configured to maintain desired operation at an operating voltage of three volts, where the capacitor includes a housing component, a first and a second current collector, a positive and a negative electrode electrically coupled to one of the first and second current collectors, and a separator positioned between the positive and the negative electrode. The capacitor may also include an electrolyte in ionic contact with the electrodes and the separator, the electrolyte having acetonitrile and a quaternary ammonium salt with a molarity of less than one.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: July 25, 2017
    Assignee: Maxwell Technologies, Inc.
    Inventors: Priya Bendale, Robert Crawford, Porter Mitchell, Jeffrey Nelson, Doug Schafer, Xiaomei Xi
  • Patent number: 9681985
    Abstract: A system and method for treating ophthalmic target tissue in which a light source generates a beam of light, a scanner unit deflects the beam of light into a pattern, a beam delivery unit for delivering the pattern to ophthalmic target tissue. The light is either pulsed or moved across the target tissue such that the light pulses having a duration of, or the light dwells on any given point of target tissue for, between 30 ?s and 10 ms.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: June 20, 2017
    Assignee: TOPCON MEDICAL LASER SYSTEMS, INC.
    Inventors: Dan E. Andersen, David H. Mordaunt
  • Patent number: 9678350
    Abstract: A method and system for providing illumination is disclosed. The method may include providing a laser having a predetermined wavelength; performing at least one of: beam splitting or beam scanning prior to a frequency conversion; converting a frequency of each output beam of the at least one of: beam splitting or beam scanning; and providing the frequency converted output beam for illumination.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: June 13, 2017
    Assignee: KLA-Tencor Corporation
    Inventors: Christian Wolters, Jijen Vazhaeparambil, Dirk Woll, Anatoly Romanovsky, Bret Whiteside, Stephen Biellak, Guoheng Zhao
  • Patent number: 9658412
    Abstract: An optical communication device includes a circuit board, a light-emitting element, a light-receiving element, and a planar light guide circuit. The circuit board includes an upper mounting surface. The upper mounting surface defines a groove. The groove includes a first inclined surface and a second inclined surface. The first and the second inclined surfaces are slanted relative to a bottom surface of the groove and connected between the upper mounting surface and the bottom surface. A reflection layer is coated on the first and second inclined surfaces. The light-emitting element includes a light emergent surface, and the light-receiving element includes a light incident surface. The light-emitting element and the light-receiving element are mounted on the upper mounting surface. The planar light guide circuit is received in the groove. Two ends of the planar light guide circuit face reflection layers of the first inclined surface and the second inclined surface, respectively.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: May 23, 2017
    Assignee: ScienBizIP Consulting (Shenzhen) Co., Ltd.
    Inventor: Kuo-Fong Tseng
  • Patent number: 9551467
    Abstract: The present invention provides a white light source comprising: a blue light emitting diode (blue LED) having a light emission peak wavelength in a range of 421 to 490 nm; and a phosphor layer including phosphor and resin, wherein the white light source satisfies a relational equation of ?0.2?[(P(?)×V(?))/(P(?max1)×V(?max1))?(B?)×V(?))/(B(?max2)×V(?max2))]?+0.2, assuming that: a light emission spectrum of the white light source is P(?); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(?); a spectrum of a spectral luminous efficiency is V(?); a wavelength at which P(?)×V(?) becomes largest is ?max1; and a wavelength at which B(?)×V(?) becomes largest is ?max2, and wherein an amount of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: January 24, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Masahiko Yamakawa, Yasuhiro Shirakawa
  • Patent number: 9496681
    Abstract: A method and apparatus is disclosed for generating tunable attosecond-scale radiation pulses, with a frequency in range of ultraviolet to soft-X-ray, from a solid-state medium. The invention utilizes an intense laser pulse to drive a high harmonic generation (HHG) process in a solid state medium and a weak secondary field to control the HHG process. The weak secondary field has a frequency equal to the second harmonic of the intense laser pulse. The spatial, temporal and spectral properties of the HHG process and the emitted harmonic beam are tuned by adjusting the relative delay between the two fields and the intensity of the weak secondary field.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: November 15, 2016
    Assignee: University of Ottawa
    Inventors: Giulio Vampa, Paul Corkum, Thomas Brabec
  • Patent number: 9410903
    Abstract: A method for estimating a parameter includes: transmitting a control signal to a coherent optical source, the control signal configured to chaotically vary an output of the optical source and generate a chaotically excited optical signal; transmitting the optical signal from the optical source into an optical fiber, the optical fiber including at least one sensing location; receiving a reflected signal including light reflected from the at least one sensing location; and estimating a value of the parameter using the reflected signal.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: August 9, 2016
    Assignee: BAKER HUGHES INCORPORATED
    Inventors: Roger Glen Duncan, Brooks A. Childers, Philip Robin Couch
  • Patent number: 9395597
    Abstract: A stereoscopic projection system and method of generating light that include two or three infrared lasers, two optical parametric oscillators, and six or seven second harmonic generators. Six colors of visible light are produced. Three bands of red, green, and blue form an image for the left eye of the viewer, while the other three bands of red, green, and blue form an image for the right eye of the viewer.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: July 19, 2016
    Assignee: Laser Light Engines, Inc.
    Inventor: Ian Turner
  • Patent number: 9383070
    Abstract: A lighting device may include a plurality of laser light sources, and an optical apparatus for concentrating the light emitted by the laser light sources. The optical apparatus has at least one ring-shaped reflector having a parabolic light reflection surface and at least one light conversion element for light wavelength conversion, which is arranged at the focus of the at least one ring-shaped reflector.
    Type: Grant
    Filed: May 27, 2013
    Date of Patent: July 5, 2016
    Assignee: OSRAM GmbH
    Inventor: Sergey Khrushchev
  • Patent number: 9383653
    Abstract: An ultraviolet laser device, includes: a first laser light output unit outputs a first infrared laser light; a second laser light output unit outputs a second infrared laser light; a first wavelength conversion optical system generates a first ultraviolet laser light of a fifth harmonic of the first infrared laser light; and a second wavelength conversion optical system to which the first ultraviolet laser light and the second infrared laser light enter, wherein the second wavelength conversion optical system includes a first wavelength conversion optical element which generates a second ultraviolet laser light by sum frequency generation of the first ultraviolet laser light and the second infrared laser light, and a second wavelength conversion optical element which generates a deep ultraviolet laser light by sum frequency generation of the second ultraviolet laser light and the second infrared laser light.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: July 5, 2016
    Assignee: NIKON CORPORATION
    Inventor: Akira Tokuhisa
  • Patent number: 9377667
    Abstract: Cascaded optical harmonic generators and methods for cascaded optical harmonic generation are disclosed. Relative disposition of individual harmonic generators of a cascaded harmonic generator in an optical path of the fundamental optical beam may be reversed. In a third harmonic generator, the fundamental optical beam may enter the third harmonic crystal first, and the second harmonic crystal second. When the fundamental optical beam enters the third harmonic crystal first, the fundamental light may remain non-depleted by second harmonic generation process.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: June 28, 2016
    Assignee: Lumentum Operations LLC
    Inventors: Martin H. Muendel, James J. Morehead
  • Patent number: 9362713
    Abstract: Radiation from a VBG-locked diode-laser at a locked wavelength of 878.6 nm is focused into a 30-mm long Nd:YVO4 optical amplifier crystal for optically pumping the crystal (24). The crystal amplifies a beam of seed-pulses from a fiber MOPA (12). The power of pump radiation is about 75 Watts. The radiation is focused into a beam-waist having a minimum diameter of about 600 micrometers. This provides an amplifier having a high gain-factor well over 100. The high-gain factor provides a gain-shaping effect on the seed-pulse beam which overcomes thermal aberrations inherent in such high-power pumping, thereby producing an amplified seed-pulse beam with M2 less than 1.3.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: June 7, 2016
    Assignee: Coherent Scotland Limited
    Inventors: David Clubley, Burly Cumberland
  • Patent number: 9356425
    Abstract: A semiconductor distributed Bragg reflector laser configured for single longitudinal mode operation, having an optical waveguide comprising an optical gain section, a first reflector being a first distributed Bragg reflector (DBR) section comprising a grating configured to produce a reflection spectrum having one or more first reflective peaks, and a second reflector, wherein the first DBR section is configured to compensate for thermal chirp that is induced inhomogeneously along the length of the DBR section, in use.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: May 31, 2016
    Assignee: OCLARO TECHNOLOGY LTD
    Inventors: Sam Davies, Andrew Ward, Andrew Carter
  • Patent number: 9312657
    Abstract: A Q-switched solid-state laser has a neodymium-doped yttrium vanadate single-crystal gain-element in the form of a prism. The prism incorporates the functions of a gain-element, a polarizer, a resonator end-mirror and an output coupler.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: April 12, 2016
    Assignee: Coherent LaserSystems GmbH & Co. KG
    Inventors: Rüdiger Von Elm, Wolf Seelert
  • Patent number: 9236703
    Abstract: A laser system comprises a pump diode, fiber, relay optics, and a microchip laser crystal. The pump diode produces light at a first wavelength. The fiber receives the light from the pump diode and produces a round, homogeneous light spot at an output of the fiber. The relay optics receives the light from the fiber. The microchip laser crystal receives the light from the relay optics and produces a linearly polarized single frequency output at a second wavelength. The microchip laser crystal includes a first layer and a second layer. The first layer absorbs the light at the first wavelength and emits light at the second wavelength. The second layer receives the light at the second wavelength and either provides a polarization dependent loss at the second wavelength or maintains a polarization of the light at the second wavelength.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: January 12, 2016
    Assignee: Raytheon Company
    Inventors: David M. Filgas, N. Peter Davis, Matthew J. Klotz, Victor Leyva, Robert Stultz, Juan Carlos Sotelo
  • Patent number: 9231373
    Abstract: A laser device capable to simultaneously generate light at multiple wavelengths that are independently (and, optionally, simultaneously) tunable without a limit of how small a spectral separation between such wavelengths can be made is enabled with the use of a laser-cavity network that (i) contains multiple spatially-distinct laser cavity portions all of which have at least one spatial region of the cavity network in common and (ii) is defined by such optical elements that prevent the intracavity amplification of light at first and second of multiple wavelengths at the expense of the same laser gain medium. Each of the distinct cavity portions contains a dedicated laser chip supporting the generation of light at a corresponding wavelength. In a special case, at least two of the multiple lasing wavelengths in the output of the device can be simultaneously and independently tuned to become equal.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: January 5, 2016
    Assignee: The Arizona Board of Regents on Behalf of the University of Arizona
    Inventors: Mahmoud Fallahi, Chris Hessenius, Michal L. Lukowski
  • Patent number: 9197027
    Abstract: The invention provides a method for making a laser module, comprising: Step 1: fixing a laser crystal and a nonlinear crystal through at least one spacing element to form a first structure; Step 2: assembling the first structure on a substrate; Step 3: removing the spacing element to form a first laser module. According to the invention, the laser crystal and the nonlinear crystal are separately fixed on a heat conductive substrate to form the laser module, thereby the size of the laser module is reduced.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: November 24, 2015
    Assignees: C2C Link Corporation, Nanjing CQ Laser Technologies, Co. Ltd.
    Inventors: Qingyang Xu, Yang Lu, Hongping Su, Xiangyang Li
  • Patent number: 9172204
    Abstract: A laser device includes: a signal light source that outputs seed light; an electro-optic modulator that chops a portion of the seed light outputted from the signal light source and outputs signal light; an optical amplifier that amplifies the signal light outputted from the electro-optic modulator; a wavelength conversion optical element that wavelength converts the signal light amplified by the optical amplifier; a converted light detector that detects the signal light that has been wavelength converted by the wavelength conversion optical element; and an EU control unit that controls the operation of the electro-optic modulator, wherein the EU control unit is adapted, in the state in which the seed light is being outputted, to adjust bias voltage of the electro-optic modulator on the basis of the applied voltage when the intensity of the signal light after wavelength conversion detected by the converted light detector becomes substantially maximum.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: October 27, 2015
    Assignee: NIKON CORPORATION
    Inventors: Akira Tokuhisa, Yasutoshi Takada
  • Patent number: 9172201
    Abstract: A wavelength conversion laser light source, includes: a solid laser medium; a wavelength conversion element; a concave mirror on which a first reflecting surface reflecting a fundamental light wave and a the second harmonic light wave is formed; and a wavelength plate on which a second reflecting surface reflecting the fundamental light wave and transmitting the second harmonic light wave is formed, wherein a laser resonator is constituted by the first reflecting surface and the second reflecting surface; the solid laser medium is arranged on a first reflecting surface side of the laser resonator, the wavelength plate is arranged on a second reflecting surface side of the laser resonator, and the wavelength conversion element is arranged between the solid laser medium and the wavelength plate; and the wavelength plate outputs the second harmonic wave, to the exterior of the laser resonator, via the second reflecting surface.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: October 27, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroyuki Furuya, Tomoya Sugita, Nobuyuki Horikawa
  • Patent number: 9166375
    Abstract: A semiconductor light emitting device includes a pump light source, a gain structure, and an out-coupling mirror. The gain structure is comprised of InGaN layers that have resonant excitation absorption at the pump wavelength. Light from the pump light source causes the gain structure to emit light, which is reflected by the out-coupling mirror back to the gain structure. A distributed Bragg reflector causes internal reflection within the gain structure. The out-coupling mirror permits light having sufficient energy to pass therethrough for use external to the device. A frequency doubling structure may be disposed between the gain structure and the out-coupling mirror. Output wavelengths in the deep-UV spectrum may be achieved.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: October 20, 2015
    Assignee: PALO ALTO RESEARCH CENTER INCORPORATED
    Inventors: Andre Strittmatter, Christopher L. Chua, Peter Kiesel, Noble M. Johnson, Joerg Martini
  • Patent number: 9153941
    Abstract: The present invention relates to a laser device comprising at least one large area VCSEL (101) and at least one optical feedback element (201, 301) providing an angular-selective feedback for laser radiation emitted from the laser. The angular-selective feedback is higher for at least one portion of laser radiation emitted at angles ?>0 to the optical axis (601) of the laser than for laser radiation emitted on said optical axis (601). The invention also refers to a method of stabilizing a laser emission of a large area VCSEL in a desired angular distribution (501, 502). With the proposed device and method, the intensity distribution of a large area VCSEL can be stabilized in a desired shape, for example a ring shape.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: October 6, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Holger Moench, Stephan Gronenborn
  • Patent number: 9097683
    Abstract: An optical system for detecting contaminants and defects on a test surface includes an improved laser system for generating a laser beam and optics directing the laser beam along a path onto the test surface, and producing an illuminated spot thereon. A detector and ellipsoidal mirrored surface are also provided with an axis of symmetry about a line perpendicular to the test surface. In one embodiment, an optical system for detecting anomalies of a sample includes the improved laser system for generating first and second beams, first optics for directing the first beam of radiation onto a first spot on the sample, second optics for directing the second beam onto a second spot on the sample, with the first and second paths at different angles of incidence to the sample surface. In another embodiment, a surface inspection apparatus includes an illumination system configured to focus beams at non-normal incidence angles.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: August 4, 2015
    Assignee: KLA-Tencor Corporation
    Inventors: Vladimir Dribinski, Yung-Ho Alex Chuang, J. Joseph Armstrong, John Fielden
  • Patent number: 9083146
    Abstract: During temperature tuning, first, the temperature of a third harmonic generating element is swept to determine the optimal temperature Ttp of the third harmonic generating element in a state where the temperature of a second harmonic generating element has been set to a temperature shifted away from the vicinity of the optimal temperature. Next, the temperature of second harmonic generating element is swept to determine the optimal temperature Tsp of the second harmonic generating element in a state where the temperature of the third harmonic generating element has been set to a temperature shifted away from the vicinity of the optimal temperature.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: July 14, 2015
    Assignee: SHIMADZU CORPORATION
    Inventors: Naoya Ishigaki, Koji Tojo, Shingo Uno, Jiro Saikawa
  • Patent number: 9057927
    Abstract: Apparatus and method for high-power multi-function millimeter-wavelength (THz-frequency) signal generation using OPO and DFG in a single cavity. In some embodiments, the OPO-DFG cavity includes an optical parametric oscillator (OPO) non-linear material that receives pump light IP having pump-light frequency and generates two different lower intermediate frequencies of light—an OPO-signal beam IS and a spatially/temporally overlapping OPO-idler beam II. A difference-frequency generator non-linear material then receives the two intermediate-frequency beams II and IS, and the DFG then generates a THz-frequency output signal that has a frequency equal to the difference between the two intermediate frequencies. In some embodiments, a single-piece crystal of non-linear material is used for both OPO and DFG functions.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: June 16, 2015
    Assignee: Lockheed Martin Coroporation
    Inventors: Yongdan Hu, Andrew Xing, Angus J. Henderson
  • Patent number: 9044255
    Abstract: An apparatus has a pump module providing pump energy, a resonator and a controller. The resonator includes a gain medium receiving the pump energy from the pump module and producing light; reflective surfaces reflecting light produced by the gain medium back toward the gain medium; and a variable light attenuator receiving light produced by the gain medium. The controller controls the amount of light attenuated by the variable light attenuator such that the apparatus emits windows of pulses of laser light at spaced time intervals, each window containing a plurality of pulses of laser light and each interval between windows being larger than an interval between pulses within a window. The emitted windows of pulses of laser light heat tissue to a temperature that causes coagulation without vaporization.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 2, 2015
    Assignee: AMS Research Corporation
    Inventors: Hyun Wook Kang, Michael Ray Hodel, Raymond Adam Nemeyer
  • Patent number: 9048611
    Abstract: The present application discloses a wavelength conversion device. The wavelength conversion device includes a light source for generating excitation light, a laser medium for generating fundamental light from the excitation light, a resonator mirror for forming a resonator for the fundamental light in cooperation with the laser medium, and a wavelength convertor for converting wavelength from the fundamental light into harmonic light. The wavelength convertor includes a first end surface inclined by an angle ? from a surface orthogonal to an optical axis of the resonator and a second end surface parallel to the first end surface.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: June 2, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kenji Nakayama, Tetsuro Mizushima, Tatsuo Itoh, Hirohiko Oowaki, Tomohiro Matsuo
  • Patent number: 9048616
    Abstract: A method, system and apparatus for automatically determining operating conditions of a periodically poled lithium niobate crystal in a laser system are provided. The system comprise: a laser; a periodic poled lithium niobate (PPLN) crystal for receiving laser input from the laser; a temperature control device for adjusting the temperature of the PPLN crystal; a temperature sensor for monitoring the temperature of the PPLN crystal; and a computing device. While the PPLN crystal is receiving laser input, temperature of the PPLN crystal is changed using the temperature control device. The computing device monitors the temperature of the PPLN crystal and corresponding power of the temperature control device during the changing, the temperature monitored using the temperature sensor. The computing device determines one or more of operating conditions of the temperature control device and an operating temperature of the PPLN crystal from a function of the power vs. the temperature.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: June 2, 2015
    Assignee: CHRISTIE DIGITAL SYSTEMS USA, INC.
    Inventor: Wayne Robinson
  • Patent number: 9036248
    Abstract: A terahertz light generation device 1 comprises a resonator structure 12 for intensifying incident light and outputting the intensified light and laser oscillation units 10, 11 for feeding the incident light into the resonator structure 12. The incident light comprises first and second incident light components having polarization states different from each other and frequencies different from each other. The laser oscillation units 10, 11 feed the resonator structure 12 with the first and second incident light components at an angle inclined from a principal surface in the resonator structure 12. The resonator structure 12 outputs light having a frequency corresponding to the difference between the respective frequencies of the first and second incident light components.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: May 19, 2015
    Assignees: Osaka Prefecture University Public Corporation, Sumitomo Electric Industries, Ltd.
    Inventors: Hajime Ishiahara, Atsuyuki Oyamada, Satoshi Kuzuhara, Hisanobu Kitaguchi, Keiji Ebata
  • Patent number: 9031101
    Abstract: A multi-color harmonic synthesized laser system for laser processing and a laser processing method using multi-color harmonic synthesized laser are disclosed. The multi-color harmonic synthesized laser system includes a laser source for providing a single laser wave, a converter for converting the single laser wave into a plurality of harmonic waves with different frequencies, and a modulating unit for modulating amplitudes and relative phases of the harmonic waves to form a plurality of modulated harmonic waves, so as to synthesize the modulated harmonic waves as a single synthesized laser wave, wherein the single synthesized laser wave is focused on an object to perform a laser processing. The converter includes a plurality of non-linear crystals for converting the single laser wave into a fundamental harmonic wave and a plurality of multi-frequency harmonic waves. The harmonic waves are coherent and collinear, and the phases of the harmonic waves are related to one another.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: May 12, 2015
    Assignee: National Tsing Hua University
    Inventors: Ci-Ling Pan, Chan-Shan Yang, Alexey Zaytsev, Yu-Liang Cai