Controlling Light Intensity Patents (Class 372/29.014)
  • Patent number: 10426009
    Abstract: The disclosed invention teaches a circuit which employs a constant voltage power source and series resistance to power an LED or LED assembly so that the brightness of the LED will be the same throughout its expected operating temperature range, solving the problems of temperature brightness compensation of a LED using an inexpensive power supply and simple design.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: September 24, 2019
    Inventor: Svetlana Eden
  • Patent number: 9755397
    Abstract: A light amplifying device includes, a light amplifying fiber to amplify a seed beam from a seed light source with an excitation beam from an excitation light source, and a controller. The controller causes the seed light source to emit the seed beam in an emission period in which the light amplifying fiber outputs the amplified light beam, causes the excitation light source to emit the excitation beam having first-level power in a non-emission period immediately before the emission period, and changes the excitation beam power to a second level higher than the first level at a beginning of the emission period. The controller increases the excitation beam power to a third level higher than the second level after starting of the emission period, and decreases gradually the excitation beam power from the third level to the second level.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: September 5, 2017
    Assignee: OMRON Corporation
    Inventor: Tatsuo Ogaki
  • Patent number: 9692993
    Abstract: Illumination estimation device includes: target object area extraction unit which extracts an object area from a multispectral image, the object area being an area, including specular reflection, of an object; distribution characteristics estimation unit which estimates information representing a subspace that approximates a distribution of observation values in a spectral space, as distribution characteristics, the distribution characteristics being characteristics of a spreading manner of the observation values in the object area within the spectral space; dimension reduction unit which selects a distribution characteristic to be used from among the distribution characteristics estimated by the distribution characteristics estimation unit depending on the number of dimensions to be reduced, the number of dimensions to be reduced being determined in advance by a light environment; and illumination estimation unit which estimates spectral characteristics of illumination based on the subspace information to be
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: June 27, 2017
    Assignee: NEC CORPORATION
    Inventor: Eiji Kaneko
  • Patent number: 9261698
    Abstract: An optical scanner includes a light source for projecting a light beam against a target, a deflector for deflecting the light beam, a coupling lens, an optical element, a light source support member, and a housing. The coupling lens directs the light beam to the deflector. The optical element focuses the light beam deflected by the deflector into a desired shape. The light source support member supports the light source. The housing houses the light source supported by the light source support member, the deflector, and the optical elements. The housing includes at least two coupling lens mounts on which the coupling lens is fixed on an optical path between the light source and the target, and accommodates multiple light source support members. The coupling lens is fixed to the coupling lens mount using an adhesive agent after an optical axis of the light beam is aligned.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: February 16, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazunori Watanabe, Keiichi Serizawa, Hiroshi Johno
  • Patent number: 9059562
    Abstract: An assembly (10) for providing an assembly output beam comprises a laser assembly (12), a power source (14), and a system controller (16). The power source (14) is electrically coupled to the laser assembly (12). The system controller (16) directs power from the power source (14) to the laser assembly (12). Additionally, the system controller (16) includes a capacitor assembly (22) that is electrically connected to the laser assembly (12), and a current source (20) that directs power from the power source (14) to the capacitor assembly (22) and the laser assembly (12). The power source (14) and the capacitor assembly (22) cooperate to provide power to the laser assembly (12). Further, the capacitor assembly (22) provides pulses of power and the current source (20) directs the pulses of power to the laser assembly (12). Moreover, the current source (20) charges the capacitor assembly (22) in between the pulses of power.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: June 16, 2015
    Assignee: DAYLIGHT SOLUTIONS, INC.
    Inventors: Allen Priest, David P. Caffey
  • Patent number: 9025240
    Abstract: A peak value detector detects power of an output light pulse which is output from the light amplifying fiber. A light receiving element receives a group of light pulses including a plurality of pulses and converts the group of light pulses into a current signal. The current/voltage converter circuit converts the current output from the light receiving element to voltage. The integration circuit integrates the voltage output from the current/voltage converter circuit. A programmable gain amplifier (PGA) amplifies the signal output from the integration circuit and provides the signal for the A/D converter circuit. The gain of the PGA is set by a gain setting signal from the signal processing circuit. The signal processing circuit adjusts the gain of the PGA so that the gain increases as the repetition frequency of the group of pulses increases.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: May 5, 2015
    Assignee: Omron Corporation
    Inventor: Tatsuo Ogaki
  • Patent number: 9025626
    Abstract: A semiconductor laser excited solid state laser device and method. The device including a semiconductor laser; a driving device; a solid state laser module which has maximum output efficiency at the set temperature and which generates, from excitation light, an output light of a predetermined output level when the optical noise is at or below a fixed level and the output level of the excitation light is the set output level; a single temperature adjustment device which adjusts the temperature of the semiconductor laser and the temperature of the solid state laser module; and a control device which controls the driving device such that the output light will be at the predetermined output level and controls the temperature adjustment device such that the temperature of the semiconductor laser and the solid state laser module will be the set temperature.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: May 5, 2015
    Assignee: Shimadzu Corporation
    Inventors: Kazutomo Kadokura, Katsuhiko Tokuda, Mamoru Hisamitsu, Kazuya Inoue
  • Publication number: 20150110139
    Abstract: An actuation device for a laser diode includes: a first driver device which is set up to generate a high-frequency modulated actuation signal and to feed the signal into the laser diode for speckle suppression, and an evaluation circuit, which is coupled with the first driver device, and which is set up to output to the first driver device an intensity signal indicating the intensity of the light emitted by the laser diode and a control signal as a function of the intensity signal in order to regulate the high-frequency modulated actuation signal.
    Type: Application
    Filed: January 25, 2013
    Publication date: April 23, 2015
    Inventors: Juergen Seidel, Reinhold Fiess, Juergen Hasch, Annette Frederikksen
  • Patent number: 8995478
    Abstract: The device is proposed which provides mode-locked operation of a fiber laser. The principle of its operation is based on a focusing effect of Kerr lens. At high intensities of the light beam the Kerr element exhibits light focusing properties. The beam focused by the Kerr element enters a fiber core without losses thus providing an effective generation of mode-locked laser. In the preferred embodiment the Kerr element is positioned at one degree relative to a perpendicular to the beam direction.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: March 31, 2015
    Assignee: Tekhnoscan-Lab LLC
    Inventors: Sergey Mikhailovich Kobtsev, Sergey Vladimirovich Kukarin, Liudmila Pavlovna Simonova
  • Patent number: 8948222
    Abstract: A light source including a laser diode, and a method of operating a light source including a laser diode are disclosed. A driving current of the laser diode is dithered to cause a near-field light intensity distribution at an end facet to be perturbed, thereby reducing a time-averaged local intensity of the laser light at the end facet of the laser diode. The reduced time-averaged intensity reduces a possibility of a damage of the end facet.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: February 3, 2015
    Assignee: JDS Uniphase Corporation
    Inventors: David Venables, Erik Paul Zucker, Victor Rossin, Justin L. Franke, Boris Kharlamov
  • Patent number: 8934158
    Abstract: An image reading apparatus includes a light-emitting device having a peak wavelength that varies depending on a value of a drive current, and illuminates a document with illumination light from the light-emitting device. A light receiving unit receives a light reflected from the document when the illumination light is emitted from the light-emitting device, and converts the received reflected light into image data at a predetermined sensitivity depending on the wavelengths of the received light. A current drive circuit supplies the drive current to turn on the light-emitting device. A wavelength distribution control unit produces two or more durations each having a different value of the drive current by controlling the current drive circuit during each main scanning to the document to produce two or more durations each having a different peak wavelength in each main scanning.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: January 13, 2015
    Assignee: Kyocera Mita Corporation
    Inventor: Masayoshi Takahashi
  • Publication number: 20150002849
    Abstract: A surface emitting laser operable to change a wavelength of emitted light includes a first reflecting mirror, a second reflecting mirror, wherein a cavity is formed between the first reflecting mirror and the second reflecting mirror along the optical axis of the surface emitting laser, an active layer formed within the cavity, a region formed within the cavity, and a movable part situated within the region, the movable part having a refractive index different from a refractive index of the region. The wavelength of emitted light is changeable by changing the position of the movable part along the direction of the optical axis in the region.
    Type: Application
    Filed: June 24, 2014
    Publication date: January 1, 2015
    Inventor: Yasuhiro Nagatomo
  • Patent number: 8923359
    Abstract: The presently disclosed technique presents laser-based method and apparatus for use in remote sensing. In general, objects within a field of view are lased by a long cavity laser apparatus. Returns are detected, captured, and processed to identify actual objects of interest. These can then be communicated to a user. Over time, the actual objects of interest can be auto-tracked.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: December 30, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Gary Paul Perryman, Mark K. Browder, James Richard Wood
  • Patent number: 8902942
    Abstract: A laser apparatus and bio-imaging apparatus are provided, which include: a mode-lock laser unit including a saturable absorber section that applies a bias voltage, a gain section that feeds a gain current, a semiconductor laser that emits laser light, and an external resonator; an optical modulation unit performing amplification modulation on the laser light emitted from the mode-lock laser unit; a reference signal generation unit generating a master clock signal and supplying a signal synchronized with the master clock signal to the gain section of the semiconductor laser; and a driving circuit generating a driving pulse used to drive the optical modulation unit based on the reference signal.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: December 2, 2014
    Assignee: Sony Corporation
    Inventors: Goro Fujita, Tsutomu Maruyama, Junichi Horigome
  • Publication number: 20140348190
    Abstract: A method for designing an optical component for shaping laser light according to one embodiment of this invention measures the intensity distribution of an incident laser light, obtains the shapes in the short and long axial directions of a pair of aspheric lenses for each of the short and long axial directions of the incident laser light from the measured intensity distribution of the incident laser light and a desired intensity distribution, performs approximation of a high-order polynomial of the shapes in the short and long axial directions of the pair of aspheric lenses, corrects the high-order polynomials for the short or long axial directions using a correction factor, and obtains the shapes of the pair of aspheric lenses on the basis of the corrected high-order polynomials.
    Type: Application
    Filed: October 12, 2012
    Publication date: November 27, 2014
    Inventors: Haruyasu Ito, Takashi Yasuda
  • Patent number: 8885680
    Abstract: A laser apparatus may include a seed laser device configured to output a pulse laser beam, a pulse energy adjusting unit configured to vary pulse energy of the pulse laser beam, at least one amplifier for amplifying the pulse laser beam, at least one power source for varying an excitation intensity in the at least one amplifier, and a controller configured to control the pulse energy adjusting unit on a pulse-to-pulse basis for the pulse laser beam passing therethrough and to control the at least one power source for a group of multiple pulses of the pulse laser beam.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: November 11, 2014
    Assignee: Gigaphoton Inc.
    Inventors: Hiroaki Nakarai, Osamu Wakabayashi, Hideo Hoshino
  • Patent number: 8861559
    Abstract: A method or algorithm to control a driving current supplied to a semiconductor laser diode (LD) is disclosed. the method first prepares the look-up-table (LUT) that stores a set of parameters, ? and ?, for evaluating the modulation current Im by the equation of Im=?×Ib+?, where Ib is determined by the auto-power-control (APC) loop. In a practical operation of the LD, the APC loop determines Ib, while, Im is calculated according to the equation above by reading above two parameters corresponding to the current temperature of the LD from the LUT.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: October 14, 2014
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Fengliang Tang, Kentarou Kitagawa
  • Patent number: 8855154
    Abstract: Circuit arrangement or circuit, in particular driver circuit, and a method for controlling at least one light-emitting component, such as an electro-optical transducer, a light-emitting diode (LED), an electroluminescent diode, a laser, or a semiconductor laser, by switching a switching element between a first switching position and a second switching position, and the voltage supply is effected by a supply element, such as a voltage source or a current source supported by a decoupling capacitor on the output side, so that current drain and output resistance are as low as possible, so that the highest possible frequency or switching speed as well as the highest possible output voltage for the light-emitting component can be achieved, the light-emitting component is controlled by varying its operating voltage, in particular by switching between the switching positions, and the first and second switching positions are of low impedance for the operating frequency.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: October 7, 2014
    Assignee: SILICON LINE GmbH
    Inventors: Martin Groepl, Holger Hoeltke
  • Patent number: 8840255
    Abstract: A scanning laser projector includes a scanning mirror that moves in a sinusoidal motion on at least one axis. Pixels are displayed by modulating a laser beam that is reflected by the scanning mirror. Pixels are generated using light pulses of different duty cycles based on the position and/or angular velocity of the laser beam.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: September 23, 2014
    Assignee: Microvision, Inc.
    Inventor: Robert James Jackson
  • Patent number: 8831053
    Abstract: A method for monitoring a laser system including a plurality of laser modules connected in series, there being connected in parallel to each laser module a bypass arrangement for bridging the corresponding laser module, includes determining a first laser power of the laser system with a plurality of laser modules operational; activating the bypass arrangement of at least one laser module so that at least one of the plurality of laser modules is bypassed; determining a second laser power of the laser system with the at least one of the plurality of laser modules bypassed; and monitoring the laser system based on a difference between the first and second laser power.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: September 9, 2014
    Assignee: Trumpf Laser GmbH + Co. KG
    Inventors: Rainer Flaig, Alexander Killi, Martin Liermann, Thomas Notheis
  • Patent number: 8824515
    Abstract: A laser processing apparatus, a filter device and a method are used for controlling a pulse laser, which is controllable in terms of its pulse energy and of a temporal triggering of laser pulses, during material processing of an object, in particular during the marking of a plastics-based document. The method includes comparing a pulse energy signal which assumes voltage values, in temporal correlation with a clock signal, which represent a pulse energy for the laser pulses for processing, with a threshold value condition and generating a logic result signal. The clock signal is passed to a gate and controlling the gate using the logic result signal and generating a retrieval signal thereby. An energy control signal is provided which has a voltage according to a specification of a control voltage. The retrieval signal and the energy control signal are used to control the pulse laser.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: September 2, 2014
    Assignee: Bundesdruckerei GmbH
    Inventor: Daniel Mysliwitz
  • Patent number: 8804779
    Abstract: A system, apparatus, and method may provide laser beams of two or more wavelengths from diode pumped solid-state laser sources (220, 222, 224). The beam paths of these laser beams with different wavelengths, which are generated by the laser sources (220, 222, 224), may be aligned along a common optical axis 280 by an optical configuration, to treat at least one target area. Frequency-doubled laser beams, output from a plurality of diode pumped solid state laser cavities, may be passed through fold mirrors (M2, M5, M8), and combined on a common optical axis 280, using one or more combiner mirrors (M10, M11, M12), to unify the beam paths. Selected laser beams may be delivered to a target using one or more delivery systems.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: August 12, 2014
    Assignee: Lumenis Ltd.
    Inventors: David Haydn Mordaunt, Steven Scott Christensen, Allison Albrecht Ferro, David A. Dewey
  • Patent number: 8761216
    Abstract: The invention is a method and apparatus for creating a color and optical density selectable visible mark on an anodized aluminum specimen. The method includes providing a laser marking system having a laser, laser optics and a controller operatively connected to said laser to control laser pulse parameters and a controller with stored laser pulse parameters, selecting the stored laser pulse parameters associated with the desired color and optical density, directing the laser marking system to produce laser pulses having laser pulse parameters associated with the desired color and optical density including temporal pulse widths greater than about 1 and less than about 1000 picoseconds to impinge upon said anodized aluminum.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: June 24, 2014
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Haibin Zhang, Glenn Simenson, Robert Hainsey, David Barsic, Jeffrey Howerton, Wayne Crowther, Patrick Leonard
  • Patent number: 8761213
    Abstract: A frequency-doubled OPS-laser having a desired output wavelength of 532 nm is tunable about that wavelength by a temperature tuned birefringent filter (BRF). The temperature of the BRF is varied while measuring transmission of a sample of the output through a Nd:YAG crystal having an absorption peak at a wavelength of about 532.4 nm. The peak is detected as a minimum of transmission and the temperature at which that minimum occurs is recorded. From wavelength-change-versus-temperature data for the BRF a temperature is calculated at which the output wavelength has the desired value and is maintained at that value to stabilize the output wavelength.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: June 24, 2014
    Assignee: Coherent GmbH
    Inventors: Wolf Seelert, Vasiliy Ostroumov
  • Patent number: 8755421
    Abstract: High-power, phased-locked, laser arrays as disclosed herein utilize a system of optical elements that may be external to the laser oscillator array. Such an external optical system may achieve mutually coherent operation of all the emitters in a laser array, and coherent combination of the output of all the lasers in the array into a single beam. Such an “external gain harness” system may include: an optical lens/mirror system that mixes the output of all the emitters in the array; a holographic optical element that combines the output of all the lasers in the array, and an output coupler that selects a single path for the combined output and also selects a common operating frequency for all the coupled gain regions.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: June 17, 2014
    Assignee: PD-LD, Inc.
    Inventor: Boris Leonidovich Volodin
  • Patent number: 8743920
    Abstract: There is provided a wavelength variable light source system capable of changing wavelength and intensity of output signal light and of improving preset accuracy and stability of the wavelength and strength of the output signal light. The system determines the both or either one of a target value for controlling wavelength and a target value for controlling intensity of output signal light of a wavelength variable light source by correlating a combination of the target wavelength and the target light output intensity specified from a higher-level device and controls operation states of the wavelength variable light source so that output values of monitoring circuits for monitoring the operation state of the wavelength variable light source converge to the target values.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 3, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Hiroyuki Koshi, Koji Horikawa
  • Patent number: 8730567
    Abstract: A terahertz continuous wave generator includes: an optical intensity modulator configured to modulate an optical signal into DSB optical signals; a local oscillator configured to generate a modulation signal for modulating the optical signal inputted to the optical intensity modulator into DSB optical signals; a notch filter configured to filter an optical signal with a specific frequency; an optical fiber amplifier configured to amplify an output signal of the optical intensity modulator; an optical circulator configured to transmit the optical signal inputted to the optical fiber amplifier to the notch filter and transmit the optical signal reflected from the notch filter to an input of the optical intensity modulator; an optical coupler configured to apply the optical signal to the optical intensity modulator; and an OE converter configured to photomix the DSB signals outputted through the notch filter.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: May 20, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sungil Kim, Kwang-Yong Kang, Dong Suk Jun
  • Patent number: 8724097
    Abstract: A source of light that could cause ocular damage within a given range from the source of light, such as a first laser, is accompanied by an optical hazard avoidance device, such as a second laser, that stimulates voluntary, involuntary, or both voluntary and involuntary responses, either physiological or behavioral or both physiological and behavioral, within one or more hazard zones, such as by inducing gaze aversion within the viewer. For example, a visible laser beam induces gaze aversion, pupil contraction or a combination of gaze aversion and pupil contraction, reducing the dose rate or exposure of the ocular tissue to damaging radiation from a primary source. In one example, the primary source is a UV Raman detector and the visible laser beam is selected to induce gaze aversion.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: May 13, 2014
    Assignee: Alakai Defense Systems, Inc.
    Inventors: Kenneth Randall Pohl, Alan Ray Ford, Robert Douglas Waterbury, Darius Vunck, Edwin L. Dottery
  • Patent number: 8685599
    Abstract: A method of pulsed laser intrinsic marking can provide a unique identifier to detect tampering or counterfeiting.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: April 1, 2014
    Assignee: Sandia Corporation
    Inventors: David P. Adams, Joel Patrick McDonald, Bradley Howell Jared, V. Carter Hodges, Deidre Hirschfeld, Dianna S. Blair
  • Patent number: 8687662
    Abstract: Methods and systems for generating pulses of laser radiation at higher repetition rates than those of available excimer lasers are disclosed that use multiple electronic triggers for multiple laser units and arrange the timings of the different triggers with successive delays, each delay being a fraction of the interval between two successive pulses of a single laser unit. Methods and systems for exposing nanoscale patterns using such high-repetition-rate lasers are disclosed.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: April 1, 2014
    Assignee: Anvik Corporation
    Inventor: Kanti Jain
  • Patent number: 8654801
    Abstract: In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: February 18, 2014
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Masanori Oto
  • Patent number: 8644356
    Abstract: A femtosecond laser based laser processing system having a femtosecond laser, frequency conversion optics, beam manipulation optics, target motion control, processing chamber, diagnostic systems and system control modules. The femtosecond laser based laser processing system allows for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: February 4, 2014
    Assignee: Imra America, Inc.
    Inventors: Lawrence Shah, James M. Bovatsek, Alan Y. Arai, Tadashi Yamamoto, Rajesh S. Patel, Donald J. Harter
  • Patent number: 8625645
    Abstract: A solid-state laser apparatus may include: a master oscillator configured to output laser light having at least one longitudinal mode, the master oscillator being capable of changing the spectral linewidth of the laser light output therefrom; at least one amplifier located downstream of the master oscillator on an optical path; a wavelength converter located downstream of the amplifier on the optical path; a detector configured to detect the spectrum of the laser light; and a controller configured to control the spectral linewidth of the laser light output from the master oscillator based on a detection result of the detector.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: January 7, 2014
    Assignee: Gigaphoton Inc.
    Inventors: Osamu Wakabayashi, Takashi Onose, Shinji Ito
  • Publication number: 20140003456
    Abstract: The invention relates to a device for transforming the profile of a laser beam (5) into a laser beam (5) with a rotationally symmetrical intensity distribution such as an M-profile or a rotationally symmetrical top-hat profile, said device comprising at least one lens array (1) with at least two lenses (5) through which the laser beam (5) that is to be transformed can pass, and optical means which can direct the laser beam (5) that has passed through the at least one lens array (1) onto a working plane (3) and/or superimpose at least some sections of said laser beam on the working plane (3), the lenses (7) of the at least one lens array (1) being arranged coaxially or concentrically with respect to one another.
    Type: Application
    Filed: January 10, 2012
    Publication date: January 2, 2014
    Applicant: LIMO Patentverwaltung GmbH & Co.KG
    Inventors: Iouri Mikliaev, Jens Meinschien, Thomas Mitra
  • Patent number: 8599891
    Abstract: Embodiments of the invention provide a laser light source comprising: a plurality of lasers connected in series; and a laser driver controllable to simultaneously drive a substantially same current through a combination of the lasers selectable from different combinations of lasers in the plurality of lasers and not through lasers in the plurality of lasers that are not in the combination.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: December 3, 2013
    Assignee: Soreq Nuclear Research Center
    Inventors: Vladimir Maron, Leonid Finkelstein, Itzhak Ziv, Eyal Lebiush, Alexander Ioffe
  • Publication number: 20130230066
    Abstract: In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG.
    Type: Application
    Filed: April 12, 2013
    Publication date: September 5, 2013
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Masanori OTO
  • Patent number: 8526474
    Abstract: A disclosed multi-beam laser power control circuit includes a light receiving element receiving power output from semiconductor lasers to control output power of a semiconductor laser array having plural semiconductor lasers, automatic power control circuits (APC circuits) controlling emission power output from semiconductor lasers based on received corresponding automatic power control execution signals so as to be set to predetermined emission power based on output from the light receiving element, and APC execution signal input terminals inputting the corresponding automatic power control execution signals, wherein, when plural APC execution signals input to the corresponding APC execution signal input terminals are overlapped, the automatic power control circuits (APC circuits) to be preferentially operated is determined based on input timings of the APC execution signals and operated.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: September 3, 2013
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomohiko Kamatani
  • Patent number: 8502695
    Abstract: Provided is a light emitting device improved in safety to an eye. The light emitting device includes: a semiconductor laser element for emitting laser light; an optical conversion member for converting coherent laser light which is emitted from the semiconductor laser element into incoherent light, and for emitting the incoherent light; and a safety device for preventing the coherent laser light from exiting to an outside.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: August 6, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Katsuhiko Kishimoto
  • Patent number: 8503495
    Abstract: The laser device includes: a seed light source that outputs seed light; a pumping light source an amplification optical fiber as the amplifier that amplifies the seed light with an element pumped by the pumping light source; a monitor unit that is provided between the seed light source and the amplification optical fiber, and monitors the intensity of the light output from the amplification optical fiber; and a light source controller that controls the seed light source. In this laser device, when the light input to the monitor unit has an intensity equal to or higher than a predetermined intensity while the seed light is not input to the amplification optical fiber, the light source controller forces to output the seed light from the seed light source.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: August 6, 2013
    Assignee: Fujikura Ltd.
    Inventor: Michihiro Nakai
  • Patent number: 8477815
    Abstract: An apparatus is provided. The apparatus includes a lasing element, a laser driver and logic. The laser driver is configured to drive the lasing element at multiple current levels, and the laser driver includes a switching network, multiple direct current (DC) loops, and an output circuit. The switching network receives a differential input signal, and each DC loop is coupled to the switching network. The output circuit is also coupled to the lasing element, and the logic is coupled to each of the DC current loops, where the logic selects one or more of the DC loops in each (of several) modes. Each mode generates one or more output lasing currents for the lasing element that corresponds to a one or more of the current levels in response to the differential input signal.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: July 2, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Douglas W. Dean, Jeremy R. Kuehlwein
  • Publication number: 20130163401
    Abstract: An optical disc apparatus includes: a light source; a power detection portion that detects optical power of light emitted from the light source; a temperature detection portion that detects an ambient temperature of the power detection portion; a storage portion in which information relating to a temperature drift characteristic of the power detection portion is stored; and a control portion that controls the optical power while performing a temperature correction relating to the power detection portion by using the information stored in the storage portion. In the optical disc apparatus, the information stored in the storage portion is updated.
    Type: Application
    Filed: November 15, 2012
    Publication date: June 27, 2013
    Applicant: FUNAI ELECTRIC CO., LTD.
    Inventor: Funai Electric Co., Ltd.
  • Patent number: 8467424
    Abstract: Methods and systems for generating pulses of laser radiation at higher repetition rates than those of available excimer lasers are disclosed that use multiple electronic triggers for multiple laser units and arrange the timings of the different triggers with successive delays, each delay being a fraction of the interval between two successive pulses of a single laser unit. Methods and systems for exposing nanoscale patterns using such high-repetition-rate lasers are disclosed.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: June 18, 2013
    Assignee: Anvik Corporation
    Inventor: Kanti Jain
  • Publication number: 20130148677
    Abstract: An EUV light source device properly compensates the wave front of laser beam which is changed by heat. A wave front compensator and a sensor are provided in an amplification system which amplifies laser beam. The sensor detects and outputs changes in the angle (direction) of laser beam and the curvature of the wave front thereof. A wave front compensation controller outputs a signal to the wave front compensator based on the measurement results from the sensor. The wave front compensator corrects the wave front of the laser beam to a predetermined wave front according to an instruction from the wave front compensation controller.
    Type: Application
    Filed: February 5, 2013
    Publication date: June 13, 2013
    Applicant: GIGAPHOTON INC.
    Inventor: Gigaphoton Inc.
  • Patent number: 8457166
    Abstract: A method of controlling a wavelength-tunable laser selecting an oscillation wavelength with a combination of a plurality of wavelength selection portions of which wavelength peak is different from each other, comprising: a first step of confirming a control direction of the wavelength selection portion in a case where a setting value is changed from a first setting value for achieving the first wavelength to a second setting value for achieving the second wavelength; a second step of setting a setting value that is shifted from the second setting value in a direction that is opposite of a pre-determined changing direction on the wavelength selection portion as a prepared setting value, when the control direction confirmed in the first step is opposite to the pre-determined changing direction; and a third step of changing the prepared setting value set in the second step to the second setting value.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: June 4, 2013
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Masao Shibata, Hirokazu Tanaka, Tsutomu Ishikawa
  • Patent number: 8411710
    Abstract: The present invention relates to a laser apparatus with a structure for realizing a fast response in carrying out a start and an end of output of pulsed laser light while effectively suppressing damage to an optical amplifying medium. The laser apparatus is provided with a seed light source, an optical amplification section, a pulse modulator, a pump power controller, and a main controller. The pulse modulator receives an output start instruction and an output end instruction fed from the main controller and controls a start and an end of output of seed light from the seed light source. The pump power controller receives a pump trigger signal fed from the main controller and increases or decreases a power of pump light supplied to the amplification section.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: April 2, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Shinobu Tamaoki
  • Publication number: 20130044774
    Abstract: An intensity of radiation emitted from at least two laser diodes of a projecting apparatus is optimized by providing an offset distance between at least two focal points of the at least two laser diodes and providing a maximum value for radiation intensity emitted by each of the laser diodes, irrespective of simultaneous transmission by one of the laser diodes with another of the laser diodes. The intensity of the radiation emitted from each of the at least two laser diodes is adjusted such that an aggregated value of the radiation intensity emitted by all of the laser diodes within a predefined period of time may exceed a threshold value allowed for the maximum permissible exposure to radiation.
    Type: Application
    Filed: August 17, 2012
    Publication date: February 21, 2013
    Applicant: STMICROELECTRONICS INTERNATIONAL N.V.
    Inventor: Sason Sourani
  • Patent number: 8379679
    Abstract: The invention is a method and apparatus for creating a color and optical density selectable visible mark on an anodized aluminum specimen. The method includes providing a laser marking system having a laser, laser optics and a controller operatively connected to said laser to control laser pulse parameters and a controller with stored laser pulse parameters, selecting the stored laser pulse parameters associated with the desired color and optical density, directing the laser marking system to produce laser pulses having laser pulse parameters associated with the desired color and optical density including temporal pulse widths greater than about 1 and less than about 1000 picoseconds to impinge upon said anodized aluminum.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: February 19, 2013
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Haibin Zhang, Glenn Simenson, Robert Hainsey, David Barsic, Jeffrey Howerton, Wayne Crowther, Patrick Leonard
  • Publication number: 20130016305
    Abstract: An illumination unit includes: a light source section including a laser light source; an optical-path branching device outputting light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path; a photodetector receiving a light flux that travels on the other optical path; a control section controlling an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector; and a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector.
    Type: Application
    Filed: July 3, 2012
    Publication date: January 17, 2013
    Applicant: SONY CORPORATION
    Inventor: Kazumasa Kaneda
  • Patent number: 8351476
    Abstract: A system and methods for the quasi-remote compression and focusing of a moderate-intensity laser pulse to form a much higher intensity beam that can be directed at a target and used as a probe beam or used in a probe beam converter to generate other forms of electromagnetic radiation or energetic particles. A system for the quasi-remote propagation of high-intensity laser beams in accordance with the present invention comprises a main platform on which a first, “seed” laser pulse is generated, stretched, and amplified, and a remote platform, located at a distance from the main platform, which is configured to receive the amplified and stretched pulse and convert it into the high-intensity laser beam. The high-intensity laser beam in turn can then be converted into one or more probe beams directed at a target object.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: January 8, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Richard F. Hubbard, Antonio C. Ting, Joseph R. Peñano, Daniel F. Gordon, Phillip A. Sprangle, Bahman Hafizi, Arie Zigler
  • Publication number: 20120327963
    Abstract: A system and methods for the quasi-remote compression and focusing of a moderate-intensity laser pulse to form a much higher intensity beam that can be directed at a target and used as a probe beam or used in a probe beam converter to generate other forms of electromagnetic radiation or energetic particles. A system for the quasi-remote propagation of high-intensity laser beams in accordance with the present invention comprises a main platform on which a first, “seed” laser pulse is generated, stretched, and amplified, and a remote platform, located at a distance from the main platform, which is configured to receive the amplified and stretched pulse and convert it into the high-intensity laser beam. The high-intensity laser beam in turn can then be converted into one or more probe beams directed at a target object.
    Type: Application
    Filed: June 21, 2012
    Publication date: December 27, 2012
    Applicant: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Richard F. Hubbard, Antonio C. Ting, Joseph R. Peñano, Daniel F. Gordon, Phillip A. Sprangle, Bahman Hafizi, Arie Zigler