Having Particular Beam Control Circuit Component Patents (Class 372/29.01)
  • Patent number: 10574027
    Abstract: An LD driver circuit includes an adjustment circuit to which a power supply voltage is applied. The adjustment circuit receives an input signal through an input terminal, generates a shifted input signal shifted in voltage from the input signal by a predetermined shift amount, and outputs the shifted input signal from an output terminal. The LD driver circuit also includes a transistor with its base receiving the shifted input signal, its collector electrically connected to an anode of a driven LD, and its emitter electrically connected to a cathode of the LD and ground, which transistor varies an amount of a shunt current flowing from the collector to the emitter in accordance with the shifted input signal. The adjustment circuit includes a comparator which compares a voltage in the collector and a threshold voltage, and increases or decreases the predetermined shift amount in accordance with an output of the comparator.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: February 25, 2020
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Naoki Itabashi, Keiji Tanaka
  • Patent number: 10480993
    Abstract: A cylindrical package includes a cylindrical housing; a pedestal at a bottom of a cylindrical space surrounded by the cylindrical housing; an optical splitter in the cylindrical space and over the pedestal; a first photodetector in the cylindrical space and over the pedestal, wherein the first photodetector is configured to be optically coupled to the optical splitter; and a second photodetector in the cylindrical space and over the pedestal, wherein the second photodetector is configured to be optically coupled to the optical splitter.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: November 19, 2019
    Assignee: EZCONN CORPORATION
    Inventors: Mao-Chieh Hsu, Shih-Lung Hsu, Jia-Cong Yu, Chin-Yin Lan
  • Patent number: 10473918
    Abstract: An image drawing device includes a laser light source controller controlling a laser light output timing of a laser light source unit and an output value of laser light so that a drawing image based on input image data is generated in a scanning region; a scanner controller controlling scanning so that the laser light is scanned with an amplitude; and a characteristic detection controller controlling the scanner controller to scan in a range in which an amplitude of scanning exceeds a scanning range corresponding to an amplitude when the laser light output value is adjusted, control the laser light source controller to output characteristic detection laser light during scanning outside of a range in which the drawing image is generated and beyond the amplitude of the scanning range, and adjust the output value of the laser light based on a detected output value of the characteristic detection laser light.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: November 12, 2019
    Assignee: JVCKENWOOD Corporation
    Inventors: Minoru Ohyama, Tatsuya Nakano
  • Patent number: 10447402
    Abstract: An optical transceiver includes an optical transmitter and an optical receiver. The optical transmitter includes a laser diode configured to convert a current signal into an optical signal; a main driver comprising first and second output terminals that have a differential structure, the main driver configured to drive the first and second output terminals in response to differential input signals and to provide the current signal to the laser diode through the first output terminal; and an impedance balancer configured to match impedances of the first and second output terminals by adjusting the impedance of the second output terminal according to signal states of the first and second output terminals.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: October 15, 2019
    Assignees: SK HYNIX INC., KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION
    Inventors: Chul Woo Kim, Sang Geun Bae, Hyun Su Park, Choong Hwan Lee
  • Patent number: 10366722
    Abstract: An apparatus comprises a laser diode configured to generate modulated light during a write operation in response to receiving modulated current having a mean amplitude that varies or is constant. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A writer heater of the slider is configured to receive power during the write operation having a magnitude that varies or is constant. A sensor is situated on or within the slider. The sensor is configured to produce a sensor signal representative of output optical power of the laser diode. Measuring circuitry is coupled to the sensor and configured to measure a change in the sensor signal indicative of a laser mode hop during the write operation.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: July 30, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, James Dillon Kiely, Joshua Ward Christensen, Jon D. Trantham, Chad Robert Barry, Tim Rausch
  • Patent number: 10355447
    Abstract: A laser device suppresses the variation of each time-lag so that a distortion of a combined laser output is suppressed. The laser device includes electric current control elements Q1, Q2 connected in series to a laser diode unit corresponding to respective laser diode units LD1, LD2, an electric current control circuit 11 that controls an electric current flow in the laser diode unit by adding a voltage to a control terminal of the electric current control element to turn on the electric current control element, and voltage adjustment circuits 12a, 12b corresponding to the laser diode unit adjusts, individually, every laser diode unit and the voltage that is added to the control terminal of the electric current control element when the laser diode is off.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: July 16, 2019
    Assignee: SHIMADZU CORPORATION
    Inventors: Shingo Uno, Tomoyuki Hiroki, Kazuma Watanabe
  • Patent number: 10320141
    Abstract: A system and method for detecting hard targets in a free-space laser system includes a laser, an optical detector, and electronics. The laser is configured to emit a laser beam along an optical path through transmitter optics into a field of view. The optical detector is positioned along a laser transmitter path and configured to receive retroreflections of the laser beam. The electronics are configured to determine if an output of the optical detector is indicative of presence of a hard target within the field of view, and control the laser to a safe state if the output is indicative of presence of the hard target.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: June 11, 2019
    Assignee: Rosemount Aerospace Inc.
    Inventors: Mark Sherwood Miller, Mark Ray
  • Patent number: 10218149
    Abstract: An optical module and a method of assembling the optical module are disclosed. The optical module comprises a laser unit, a modulator unit, and a detector unit mounted on respective thermo-electric coolers (TECs). The modulator unit, which is arranged on an optical axis of the first output port from which a modulated beam is output, modulates the continuous wave (CW) beam output from the laser unit. On the other hand, the laser unit and the detector unit are arranged on another optical axis of the second output port from which another CW beam is output. The method of assembling the optical module first aligns one of the first combination of the laser unit and the modulator unit with the first output port and the second combination of the laser unit and the detector unit, and then aligns another of the first combination and the second combination.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: February 26, 2019
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuhiro Yamaji, Yasushi Fujimura, Toru Watanabe, Yasuyuki Yamauchi, Tomoya Saeki, Munetaka Kurokawa
  • Patent number: 9853411
    Abstract: Gain switched laser diode pulses are used as seed pulses for optical pulse generation. ASE is reduced by applying a prebias to the laser diodes at an amplitude less than that associated with a laser diode threshold. An electrical seed pulse having an amplitude larger than that associated with laser threshold is applied within about 10-100 ns of the prebias pulse. The resulting laser diode pulse can be amplified in a pumped, rare earth doped optical fiber, with reduced ASE.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: December 26, 2017
    Assignee: nLIGHT, Inc.
    Inventors: Timothy S. McComb, Dennis McCal
  • Patent number: 9728937
    Abstract: A method of controlling a wavelength tunable laser to control an oscillation wavelength based on a difference between a detection result of a wavelength by a wavelength detecting unit and a target value, the method includes: acquiring a first drive condition of the wavelength tunable laser to make the wavelength tunable laser oscillate at a first wavelength from a memory; calculating a second drive condition to drive the wavelength tunable laser at a second wavelength by referring to the first drive condition and a wavelength difference between the first wavelength and the second wavelength, the second wavelength differing from the first wavelength; and driving the wavelength tunable laser based on the second drive condition calculated at the calculating of the second drive condition.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: August 8, 2017
    Assignee: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventors: Hirokazu Tanaka, Masao Shibata, Hiromitsu Kawamura, Mitsuyoshi Miyata
  • Patent number: 9723669
    Abstract: An LED lighting system is disclosed comprising: a heatsink; a plurality of strings of LEDs each string comprising one or more LEDs each having a junction and being mounted on the heatsink, and a controller comprising a memory unit and a processor and being configured to supply a current to each of the strings of LEDs; the processor comprises: a first temperature estimation subunit configured to generate an estimate of a temperature of the junction of a one of strings of LEDs; a heatsink temperature estimation subunit configured to estimate a temperature of the heatsink unit from the first estimate; and a second temperature estimation subunit configured to provide an estimate of a temperature of the junction of a second string of LEDs, from the estimated temperature of the heatsink. A controller for and method of operating a plurality of LEDs are also disclosed.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: August 1, 2017
    Assignee: NXP B.V.
    Inventors: Aliaksei Vladimirovich Sedzin, Marc Vlemmings
  • Patent number: 9595807
    Abstract: A circuit arrangement for operating a laser diode in clocked mode includes a monitor photodiode, from the signal of which a measure of the radiation emitted by the laser diode is obtained as voltage to be measured, and a comparator, which compares the voltage to be measured with a reference voltage and provides the difference signal to a controller, wherein both the voltage to be measured and the reference voltage are applied continuously to the comparator. In order to carry out operation of the laser diode in clocked mode, a clocked-mode operation of the energy supply of the comparator is provided.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: March 14, 2017
    Assignee: Balluff GmbH
    Inventor: Bernd Fingerle
  • Patent number: 9491824
    Abstract: The invention is a method and apparatus to provide a temperature compensation for LED brightness utilizing temperature dependence of voltage-current characteristic of the LED. Methods ensure the precise compensation of brightness of LED using two or more temperatures to tune an LED driver circuit without the use of thermistors or other temperature sensor. This method also allows for circuits that compensate brightness not only of a single LED but of an assembly of LEDs. The method allows to manufacture LED modules with built-in temperature brightness compensation circuit. These modules can be used in a variety of illuminating equipment including but not limited to home lights, vehicle turn or brake signals, traffic lights, and a backlight for LCD display.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: November 8, 2016
    Inventor: Svetlana Eden
  • Patent number: 9482984
    Abstract: An image forming apparatus is provided for controlling current(s) supplied to a semiconductor laser. In one or more embodiments, an image forming apparatus corrects a value of the driving current and a value of at least one correction current (e.g., first and/or second correction current(s)) supplied in synchronization with the supply start of the driving current based on a reception result of a light receiving unit. In one or more embodiments, an image forming apparatus includes a correction current supply unit including a first correction current generation unit for generating a first correction current that attenuates over time and a second correction current generation unit for generating a second correction current that attenuates over time and of which an attenuation speed is lower than that of the first correction current, and configured to supply the first correction current and the second correction current to the semiconductor laser.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: November 1, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shunsaku Kondo
  • Patent number: 9407358
    Abstract: An optical network terminal with functions of detecting, recovering and blocking failures, and storing the information according to the present invention comprises: an uplink carrying out a function to communicate with a high level system; a communication port distributing or integrating the communication; a CPU managing distribution and integration of the communication; and a system power source for supplying power to the uplink, the communication port and the CPU, wherein the uplink comprises an optical module carrying out optical communication with the high level system; a MAC module controlling optical communication with the high level system; and a failure detection, recovery and blocking module for detecting optical output of the optical module, recovering failures and blocking optical output outside the MAC module. In accordance with the present invention, faster and specific failure solution can be provided using a low-cost microprocessor and its storage media.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: August 2, 2016
    Assignee: UBIQUOSS INC.
    Inventors: Dae Hwan Kim, Sang Hern Lee
  • Patent number: 9246596
    Abstract: Various embodiments of a coherent receiver including a widely tunable local oscillator laser are described herein. In some embodiments, the coherent receiver can be integrated with waveguides, optical splitters and detectors to form a monolithic optical hetero/homodyne receiver. In some embodiments, the coherent receiver can demodulate the full phase information in two polarizations of a received optical signal over a range of optical wavelengths.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: January 26, 2016
    Assignee: FREEDOM PHOTONICS, LLC.
    Inventors: Jonathon Barton, Milan Mashanovitch
  • Patent number: 9089927
    Abstract: A method and apparatus of generating a laser pulse of a desired energy and micro-machining a substrate using the laser pulse. A beam of light is provided from a laser source. The beam is directed via a modulator to produce an output laser pulse with a portion of the laser pulse being used to determine the energy of the laser pulse. The modulator is controlled so as to switch off the output laser pulse when the determined energy of the output laser pulse reaches a threshold value. The output laser pulse is steered to a substrate for micro-machining.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: July 28, 2015
    Assignee: POWERPHOTONIC, LTD.
    Inventors: Krzysztof Michal Nowak, Howard John Baker, Roy McBride, Jozef Jacek Wendland
  • Patent number: 8989225
    Abstract: A laser apparatus includes a master oscillator capable of outputting a laser beam having a spectrum that includes at least three wavelength peaks, a multi-wavelength oscillation control mechanism capable of controlling energy of each of the wavelength peaks, a spectrum detecting unit that detects the spectrum of the above-mentioned laser beam, and a controller that controls the multi-wavelength oscillation control mechanism based on a detection result detected by the spectrum detecting unit.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: March 24, 2015
    Assignee: Gigaphoton Inc.
    Inventors: Kouji Kakizaki, Shinji Okazaki, Osamu Wakabayashi, Takashi Onose, Shinichi Matsumoto
  • Patent number: 8953655
    Abstract: A laser diode (LD) driver to suppress the excess emission of an LD is disclosed. The LD driver has the shunt configuration with a driving transistor connected in parallel to the LD to shunt the bias current provided to the LD. The driver further provides a protection circuit to divide the bias current when the bias current is active but the driving transistor is turned off at an instant of the power on and off of the LD driver.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: February 10, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Akihiro Moto
  • 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: 8934324
    Abstract: There is provided a light source including a mode-lock laser unit that includes a semiconductor laser and an external resonator unit and emits a laser beam having a predetermined frequency, the semiconductor laser including a saturable absorber unit that applies a reverse bias voltage and a gain unit that applies a gain current, a semiconductor optical amplifier that performs amplification modulation on the laser beam emitted from the mode-lock laser unit, a laser clock generating unit that generates a laser clock synchronized with the laser beam based on a signal detected from the saturable absorber unit when the laser beam oscillates in the mode-lock laser unit, and a modulating unit that generates a driving current synchronized with the laser clock and applies the driving current to the semiconductor optical amplifier.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: January 13, 2015
    Assignee: Sony Corporation
    Inventors: Tsutomu Maruyama, Goro Fujita
  • Patent number: 8902941
    Abstract: In one embodiment of the invention, a semiconductor optical amplifier (SOA) in a laser ring is chosen to provide low polarization-dependent gain (PDG) and a booster semiconductor optical amplifier, outside of the ring, is chosen to provide high polarization-dependent gain. The use of a semiconductor optical amplifier with low polarization-dependent gain nearly eliminates variations in the polarization state of the light at the output of the laser, but does not eliminate the intra-sweep variations in the polarization state at the output of the laser, which can degrade the performance of the SS-OCT system.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: December 2, 2014
    Assignee: LightLab Imaging, Inc.
    Inventor: Joseph M. Schmitt
  • 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
  • Patent number: 8902947
    Abstract: An optical module providing higher reliability during high-speed light modulation and a lower bit error rate when built into a transmitter (transceiver). An optical module contains a taper mirror for surface emission of output light, an optical modulator device, and an optical modulation drive circuit, and the optical modulator device and the optical modulation drive circuit are mounted at positions so as to enclose the taper mirror.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: December 2, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Shigeki Makino, Yasunobu Matsuoka, Kenji Kogo, Toshiki Sugawara, Tatemi Ido
  • Patent number: 8873597
    Abstract: A method for adjusting laser beams (4) for scanners arranged on a support for radiotherapy, by a device consisting of a one-piece assembly (1) comprising (3) a suitable electronic control board (8), and position sensors (3) for visualizing the position of the beams (4), and adjusting them automatically by motor-driven systems, which is remarkable in that it comprises the steps of installing the apparatus (1); presetting of the position via 3 support feet (6) and embedded spirit levels (7); movement of the table of the scanner to position the front face (11) of the apparatus in the plane of the isocenter of the scanner and positioning via internal lasers of the scanner; acquisition of position control images of the apparatus (1) and finalization and validation thereof, movement of the table of the scanner by the nominal distance between the machine isocenter and the laser isocenter, which is determined and validated at the time of installation of the lasers; connection of the apparatus (1) and powering up ther
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: October 28, 2014
    Assignee: Cyrpa International
    Inventor: Pascal Bouliniere
  • Patent number: 8861558
    Abstract: A laser system may include: a master oscillator configured to output pulsed laser light; an amplification device for amplifying the pulsed laser light from the master oscillator; a first timing detector configured to detect a first timing at which the master oscillator outputs the pulsed laser light; a second timing detector configured to detect a second timing at which the amplification device discharges; and a controller configured to, based on results of detection by the first timing detector and the second timing detector, control at least one of the first timing and the second timing so that the amplification device discharges when the pulsed laser light passes through a discharge space of the amplification device.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: October 14, 2014
    Assignee: Gigaphoton, Inc.
    Inventors: Masaya Yoshino, Takashi Onose, Osamu Wakabayashi
  • 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: 8854928
    Abstract: Apparatus and systems create differential drive signals suitable for HAMR data recording. A laser diode differential driver provides heating current pulses at a time ?1. The pulses energize a laser diode to pre-heat the magnetic medium to be written. Some embodiments duplicate portions of the laser diode circuit architecture to create a magnetic write head differential driver. The write head driver provides write current pulses to a magnetic write head in one direction with ?1 timing and in the opposite direction with ?2 timing. Both drivers utilize sets of reference voltages capable of being switched to one terminal or the other of the element to be driven. In the laser diode case, the common mode is split between the anode and cathode sections of the driver. A feedback element is added between the cathode and anode sections to provide current accuracy independent of the electrical characteristics of the selected laser diode.
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: October 7, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Jeremy Robert Kuehlwein
  • Publication number: 20140286365
    Abstract: According to one embodiment, a solid state lighting device includes an irradiating section, a scattering section, a wavelength conversion layer, a supporting plate, a returned light guiding section, a light receiving section, and a control circuit. The irradiating section emits laser light. The scattering section includes a light scattering material that reflects the laser light and emits the laser light as scattered light. The wavelength conversion layer absorbs the scattered light made incident thereon and emits wavelength-converted light. The scattered light and the wavelength-converted light change to returned light and propagate through the inside of the supporting plate. The returned light is introduced into the returned light guiding section. The light receiving section detects the returned light. When a detected light amount of the returned light is outside a predetermined range, the control circuit outputs an emission stop signal for the laser light to the irradiating section.
    Type: Application
    Filed: September 13, 2013
    Publication date: September 25, 2014
    Applicant: Toshiba Lighting & Technology Corporation
    Inventor: Masato Ishikawa
  • Patent number: 8842704
    Abstract: An RF power-supply for driving a carbon dioxide CO2 gas-discharge laser includes a plurality of power-oscillators phase-locked to a common reference oscillator. Outputs of the phase-locked power-oscillators are combined by a power combiner for delivery, via an impedance matching network, to discharge-electrodes of the laser. In one example the powers are analog power-oscillators. In another example, the power-oscillators are digital power-oscillators.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: September 23, 2014
    Assignee: Coherent, Inc.
    Inventors: David P. Schmelzer, W. Shef Robotham, Jr., Frederick W. Hauer, Joel Fontanella
  • Patent number: 8837542
    Abstract: A laser diode driving apparatus for optical communication is provided so as to prepare a low-price and low-power optical transmission and reception apparatus by realizing the high performance laser diode driving apparatus for optical communication with a structure appropriate for a multichannel array that can easily and effectively provide stable bandwidths and high gains of the optical communication laser diode at a transmission end of the optical transmission and reception apparatus.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: September 16, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choong-Reol Yang, Sang-Soo Lee
  • Patent number: 8837539
    Abstract: An optical power stabilizing device is adapted to stabilize optical power of a light emitting device having a forward voltage, and includes a current generating circuit that generates a pulse-wave driving current to drive light emission of the light emitting device, an optical-type feedback circuit that outputs a first feedback voltage according to detected optical power of the light emitting device, an electrical-type feedback circuit that outputs a second feedback voltage according to the forward voltage, and a pulse wave generating circuit that generates a pulse-wave signal to control the current generating circuit according to one of the first feedback voltage and the second feedback voltage.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: September 16, 2014
    Assignee: National Chi Nan University
    Inventors: Tai-Ping Sun, Hsiu-Li Shieh, Kun-Shuan Huang, Ming-Chiao Shieh
  • 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: 8811440
    Abstract: A method and apparatus for stabilizing the seed laser in a laser produced plasma (LPP) extreme ultraviolet (EUV) light system are disclosed. In one embodiment, the cavity length of the laser may be adjusted by means of a movable mirror forming one end of the cavity. The time delay from the release of an output pulse to the lasing threshold next being reached is measured at different mirror positions, and a mirror position selected which results in a cavity mode being aligned with the gain peak of the laser, thus producing a minimum time delay from an output pulse of the laser to the next lasing threshold. A Q-switch in the laser allows for pre-lasing and thus jitter-free timing of output pulses. Feedback loops keep the laser output at maximum gain and efficiency, and the attenuation and timing at a desired operating point.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: August 19, 2014
    Assignee: ASML Netherlands B.V.
    Inventor: Richard L. Sandstrom
  • Patent number: 8803027
    Abstract: A thin beam laser crystallization apparatus for selectively melting a film deposited on a substrate is disclosed having a laser source producing a pulsed laser output beam, the source having an oscillator comprising a convex reflector and a piano output coupler; and an optical arrangement focusing the beam in a first axis and spatially expanding the beam in a second axis to produce a line beam for interaction with the film.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: August 12, 2014
    Assignee: Cymer, LLC
    Inventor: Thomas Hofmann
  • Patent number: 8798468
    Abstract: A laser system includes an array of lasers that emit light at a number of different, fixed wavelengths. A group of optical transport systems connect to the laser system. Each of the optical transport systems is configured to modulate data signals onto the light from the laser system to create optical signals and transmit the optical signals on one or more optical fibers.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: August 5, 2014
    Assignee: Juniper Networks, Inc.
    Inventor: Pradeep Sindhu
  • Patent number: 8787415
    Abstract: Embodiments for driving a laser diode includes generating a bias current having a duty cycle that is less than 100%. The current level of the bias current is insufficient to turn on the laser diode. A drive current is generated and combined with the bias current to turn on the laser diode almost instantly.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: July 22, 2014
    Assignee: IXYS Corporation
    Inventor: James Budai
  • Publication number: 20140169392
    Abstract: A laser emitter module may include a first laser emitter configured to output first laser beam having a first radiation angle by receiving first input laser beam and a second laser emitter configured to output second laser beam having a radiation angle different from the first radiation angle by receiving second input laser beam having a width different from that of the first input laser beam. The first and second laser emitters output the first and second laser beam together.
    Type: Application
    Filed: May 7, 2013
    Publication date: June 19, 2014
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
  • Patent number: 8750340
    Abstract: An improved ignition safety device (ISD) employs one or more optical switches to accomplish a SAFE-ARM function for a laser initiated ordnance system (LIOS). At least one optical switch along with appropriate control and status monitoring provide an optical SAFE-ARM function and optionally a distribution function. An optical switch performing the SAFE-ARM function diverts a laser signal to a heat sink assembly when in a SAFED position and switches to the LIOS when in an ARMED position. When in the SAFED position, the LOSAD provides an optical block in the laser energy path between a laser firing unit and the LIOS to prevent inadvertent ordnance operation. An optical switch performing the distribution function has two or more switch positions that direct a received laser signal to two or more laser initiated devices.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: June 10, 2014
    Assignee: Intuitive Research and Technology Corporation
    Inventor: J. Wayne McCain
  • 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: 8686331
    Abstract: The present invention is directed to a laser system in which a current laser wavefront performance of the laser system may be monitored. Further, the laser system embodiments disclosed herein may be configured for correcting the laser wavefront internally via correction system(s) within the laser system. Still further, the correction system(s) disclosed herein may provide a long lifetime of performance and may be configured for having a minimal impact on photocontamination.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: April 1, 2014
    Assignee: KLA-Tencor Corporation
    Inventor: J. Joseph Armstrong
  • Patent number: 8675701
    Abstract: The present invention relates to opto-isolators. Opto-isolators are disclosed that include a transmitter package and a vertical VCSEL disposed within the transmitter package. The opto-isolators further include a receiver package and a photodetector disposed within the receiver package. The photodetector is optically coupled to the VCSEL and configured to receive an output optical signal generated by the VCSEL. The opto-isolators further include an alignment package configured to receive the transmitter package and the receiver package. In another embodiment, opto-isolators include a VCSEL and a photodetector optically coupled to the VCSEL and configured to receive an output optical signal generated by the VCSEL. The opto-isolators further include a package enclosing both the VCSEL and the photodetector.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: March 18, 2014
    Assignee: Finisar Corporation
    Inventors: James K. Guenter, Jimmy A. Tatum, Norman Brent Stapleton, Richard L. Bell, Harold Young Walker, Jose Joaquin Aizpuru
  • Patent number: 8660164
    Abstract: Dry oxygen, dry air, or other gases such as ozone are hermetically sealed within the package of the external cavity laser or ASE swept source to avoid packaging-induced failure or PIF. PIF due to hydrocarbon breakdown at optical interfaces with high power densities is believed to occur at the SLED and/or SOA facets as well as the tunable Fabry-Perot reflector/filter elements and/or output fiber. Because the laser is an external cavity tunable laser and the configuration of the ASE swept sources, the power output can be low while the internal power at surfaces can be high leading to PIF at output powers much lower than the 50 mW.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: February 25, 2014
    Assignee: Axsun Technologies, Inc.
    Inventors: Peter S. Whitney, Dale C. Flanders
  • Patent number: 8630323
    Abstract: Apparatus and method for control of lasers (which use an array of optical gain fibers) in order to improve spectrally beam-combined (SBC) laser beam quality along the plane of the SBC fiber array via spectral-to-spatial mapping of a portion of the spectrally beam-combined laser beams, detection of optical power in each of the spatially dispersed beams and feedback control of the lasers for wavelength-drift correction. The apparatus includes a diffractive element; a source of a plurality of substantially monochromatic light beams directed from different angles to a single location on the diffractive element, wherein the diffractive element spectrally combines the plurality of light beams into a single beam. A controller adjusts characteristics of the light beams if one of the light beams has become misadjusted. In some embodiments, the controller adjusts the wavelength tuning of the respective fiber laser.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: January 14, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: Eric C. Honea, Donald R. Jander, Pratheepan Madasamy, Tolga Yilmaz
  • Publication number: 20140009729
    Abstract: The present invention is a laser irradiation apparatus which is capable of selecting among a plurality of laser lights L having different wavelengths a laser light of a wavelength according to a purpose of irradiation and irradiating an object Ob to be irradiated with the laser light having the wavelength. The laser irradiation apparatus includes: on an optical path of a mixed light beam of the plurality of laser lights L having different wavelengths, a slit having a width corresponding to a diffraction limit of the laser light having the shortest wavelength among the plurality of laser lights L having different wavelengths; and an objective lens for focusing a laser light that has passed through the slit, on the object Ob to be irradiated.
    Type: Application
    Filed: September 10, 2013
    Publication date: January 9, 2014
    Applicant: V TECHNOLOGY CO., LTD.
    Inventor: Kazuya OTAKI
  • Patent number: 8625991
    Abstract: A laser system includes an array of lasers that emit light at a number of different, fixed wavelengths. A group of optical transport systems connect to the laser system. Each of the optical transport systems is configured to modulate data signals onto the light from the laser system to create optical signals and transmit the optical signals on one or more optical fibers.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: January 7, 2014
    Assignee: Juniper Networks, Inc.
    Inventor: Pradeep Sindhu
  • Patent number: 8605764
    Abstract: A projection apparatus includes at least one laser diode and a laser diode junction temperature estimator to estimate the junction temperature of the at least one laser diode. Laser diode current drive values are modified in response to the estimated laser junction temperature. The modification of laser diode current drive values may occur as frequently as once per pixel.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: December 10, 2013
    Assignee: Microvision, Inc.
    Inventors: Bruce C. Rothaar, Dale Eugene Zimmerman, Joel Sandgathe
  • 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
  • Patent number: 8588264
    Abstract: An ultrashort pulse/ultra-high power laser diode with a simple structure and configuration is provided. In a method of driving a laser diode, the laser diode is driven by a pulse current which is 10 or more times higher than a threshold current value. The width of the pulse current is preferably 10 nanoseconds or less, and the value of the pulse current is specifically 0.4 amperes or over.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: November 19, 2013
    Assignees: Sony Corporation, Tohoku University
    Inventors: Hiroyuki Yokoyama, Shunsuke Kono, Tomoyuki Oki, Masao Ikeda, Takao Miyajima, Hideki Watanabe