Particular Operating Compensation Means Patents (Class 372/33)
  • Patent number: 10290993
    Abstract: A VCSEL illuminator module includes a module forming a physical cavity having electrical contacts positioned on an inner surface of the module that feed through the module to electrical contacts positioned on an outer surface of the module. A VCSEL device is positioned on the inner surface module and includes electrical contacts that are electrically connected to the electrical contacts on the inner surface of the module. The VCSEL device generates an optical beam when current is applied to the electrical contacts. An optical element is positioned adjacent to an emitting surface of the VCSEL device and is configured to modify the optical beam generated by the VCSEL device.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: May 14, 2019
    Assignee: Princeton Optronics, Inc.
    Inventors: Tong Chen, Chuni Ghosh, Qing Wang, Alexey Kovsh, Laurence Watkins
  • Patent number: 10008824
    Abstract: An optical module for preventing laser beam leakage and a control method thereof are disclosed. The optical module including a current control circuit, a first transistor, a laser, and a laser control unit. The laser control unit is configured to: if it is detected that an optical fiber is inserted in the optical fiber interface, perform control to turn on the laser, or if it is detected that no optical fiber is inserted in the optical fiber interface, control the laser to remain in an off state. A laser beam is effectively prevented from causing human bodily injury when an optical fiber is not inserted in an optical fiber interface.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: June 26, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Meiyong Yu, Wei Xu, Song Yang
  • Patent number: 10008822
    Abstract: A laser system and associated method are provided for controlling the wave front of a primary laser beam. The laser system includes a laser medium for producing a primary laser beam and at least one optical element to which the primary laser beam is directed. The laser system also includes a secondary laser source for producing a secondary laser beam. The laser system may further include a spatial light modulator configured to receive the secondary laser beam and to spatially modulate the secondary laser beam to create a spatially modulated secondary laser beam having a spatial intensity pattern. The spatially modulated secondary laser beam may impinge upon at least one of the laser medium or the at least one optical element in order to selectively modify the temperature of portions of the laser medium or the at least one optical element upon which the spatially modulated secondary laser beam impinges.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: June 26, 2018
    Assignee: The Boeing Company
    Inventor: Wade Lawrence Klennert
  • Patent number: 9989729
    Abstract: Systems and methods for detecting trace gases utilize a resonance optical cavity and a coherent light source coupled to the cavity through a cavity coupling mirror. The cavity is constructed of a material having the same or a similar coefficient of thermal expansion as the mirror elements defining the cavity. The main (bulk) cavity material may be the same as the main (bulk) material that forms the mirror elements, or it may be different. Such resonant cavity configurations provide improved accuracy and stability as compared to existing cavity configurations based upon similar principles.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: June 5, 2018
    Assignee: LI-COR, Inc.
    Inventor: Serguei Koulikov
  • Patent number: 9927483
    Abstract: The temperature calibration characteristic curve of a semiconductor component can be readily determined by interconnecting the power connections of the semiconductor component with a first current source for a load current, a second current source for a measurement current and a voltmeter for measuring the voltage drop across the power connections. Furthermore, the semiconductor component is connected to a data processing system and heated by the dissipated power at time intervals when the first current source is connected, and the voltage drop across the power or auxiliary connections is measured when the first current source disconnected and the second current source is connected between the intervals after a time duration determined by the thermal main time constant of the semiconductor component. The temperature of the semiconductor component is separately measured and the temperature calibration characteristic curve is obtained by correlating the measured temperature with the voltage drop.
    Type: Grant
    Filed: March 16, 2013
    Date of Patent: March 27, 2018
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Marco Bohlländer, Christian Herold, Sebastian Hiller
  • Patent number: 9819138
    Abstract: An object information acquiring apparatus is used which includes a laser medium that oscillates laser light, an excitation source that excites the laser medium, a voltage accumulator that applies a voltage to the excitation source, a voltage supplier that supplies a voltage to the voltage accumulator, a voltage controller that limits a maximum supplied voltage from the voltage supplier, a receiver that receives a photoacoustic wave generated by an object irradiated with the laser light, and a constructor that acquires characteristic information relating to the object in use of the photoacoustic wave, wherein the voltage controller compares a measured voltage value obtained by implementing division of a supplied voltage from the voltage supplier with a reference voltage value defining the maximum supplied voltage.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: November 14, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Shigeru Ichihara
  • Patent number: 9660421
    Abstract: A multiple-output laser component is described with a plurality of diode lasers in a common package, each of the diode lasers having distinct electrical control and optically coupled to a distinct output fiber, the component configured such that up to a maximum total output power can be selectively and dynamically partitioned among said diode lasers. The dynamic allocation can be based on demand for laser power in a fiber optic coupled to each diode laser. The multi-output laser component can be used to drive amplifiers associated with a multicast switch in some embodiments.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: May 23, 2017
    Assignee: NeoPhotonics Corporation
    Inventors: Ilya Vorobeichik, Edward C. Vail, Anthony J. Ticknor
  • Patent number: 9647764
    Abstract: A distortion compensation circuit compensates for the distortions generated by the dispersion-slope of an optical component and the frequency chirp of an optical transmitter. The dispersion compensation circuitry can be utilized in the optical transmitter, the optical receiver and/or at some intermediate point in a fiber-optic network. One embodiment of the compensation circuit utilizes a primary electrical signal path that receives at least a portion of the input signal and a delay line; and a secondary signal path in parallel to the primary path that receives at least a portion of the input signal and including: an amplifier with an electrical current gain that is proportional to the dispersion-slope of the optical component, an optional RF attenuator, an optional delay line, a “squarer” circuit, and a “differentiator” circuit.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: May 9, 2017
    Assignee: Aurora Networks, Inc.
    Inventor: Sudhesh Mysore
  • Patent number: 9575164
    Abstract: A LIDAR sensor system includes: a transmitting unit including one or more emitting units so as to transmit polarization lasers to an object; a receiving unit configured to receive reflection light reflected on the object; and a processing unit configured to sense the object from the reflection light, and the transmitting unit may include a first emitting unit emitting a first laser and a second emitting unit emitting a second laser having polarization light orthogonal to the first laser.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: February 21, 2017
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Won Gyum Kim
  • Patent number: 9531148
    Abstract: A laser resonator comprises a cylindrical gain medium, a cooling system and a coupling member. The cylindrical gain medium comprises a central axis, an outer side surface, two opposing end faces and a first depression in the outer side surface. The cooling system comprises a cooling jacket disposed around the gain medium that defines a cooling cavity, in which cooling fluid is guided over the side surface of the gain medium. In one embodiment, the cooling jacket comprises a second depression. The coupling member is received within the first and second depressions. Movement of the first depression along the central axis relative to the cooling jacket is restricted by the coupling member.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: December 27, 2016
    Assignee: Boston Scientific Scimed, Inc.
    Inventors: Rongwei Jason Xuan, Russel E. Klein, Michael A. Scott, James E. Johnson, Edward D. Reed, Jr., Xirong Yang
  • Patent number: 9042424
    Abstract: A silicon-based thermal energy transfer apparatus that aids dissipation of thermal energy from a heat-generating device, such as an edge-emitting laser diode, is provided. In one aspect, the apparatus comprises a silicon-based base portion having a first primary surface and a silicon-based support structure. The silicon-based support structure includes a mounting end and a distal end opposite the mounting end with the mounting end received by the base portion such that the support structure extends from the first primary surface of the base portion. The support structure includes a recess defined therein to receive the edge-emitting laser diode. The support structure further includes a slit connecting the distal end and the recess to expose at least a portion of a light-emitting edge of the edge-emitting laser diode when the edge-emitting laser diode is received in the support structure.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 26, 2015
    Inventors: Gerald Ho Kim, Jay Eunjae Kim
  • Patent number: 9031108
    Abstract: A temperature-compensated laser driving circuit for driving a laser component is provided. The temperature-compensated laser driving circuit includes: a temperature compensation circuit, configured to generate a second current based on a first current and a temperature-independent current; and a modulation current generating circuit, configured to generate a modulation current based on the second current, and calibrate optical power output of the laser component based on the modulation current. The first current is proportional to the absolute temperature. The second current and the first current have a slope relative to the absolute temperature respectively, and the slope of the second current relative to the absolute temperature is larger than of the slope of the first current relative to the absolute temperature.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: May 12, 2015
    Assignee: VIA TECHNOLOGIES, INC.
    Inventors: Cheng-Ming Ying, Wei-Yu Wang, Yi-Jan Wang, Yen-Yu Chen
  • 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
  • Patent number: 9008147
    Abstract: A silicon-based thermal energy transfer apparatus that aids dissipation of thermal energy from a heat-generating device, such as an edge-emitting laser diode, is provided. In one aspect, the apparatus comprises a base portion and a support portion. The base portion is made of silicon and includes a first primary surface. The first primary surface includes at least first and second V-notch grooves thereon. The support portion is made of silicon and includes at least first and second edges that are interlockingly received in the first and second V-notch grooves when the support portion is mounted on the base portion.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: April 14, 2015
    Inventors: Gerald Ho Kim, Jay Eunjae Kim
  • Patent number: 8976825
    Abstract: A heat sink mount for a laser diode comprises three main components, a diode ring, a diode bed and a diode container. The diode ring comprises an inner hole that matches a metal stem part of the laser diode. The diode bed comprises a first part and a second part. The diode ring is fitted into the first part of the diode bed. The inner surface of the first part is tightly contacting the outer surface of the diode ring. The diode container comprises a part a and a part b. The diode bed is fitted into the part a of the diode container, via the gripping contact between the thread on the inner surface of the part a and the thread on the outer surface of the second part of diode bed. This heat sink mount has lower costs and higher heat dissipation efficiency.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: March 10, 2015
    Inventors: Richard Redpath, James Redpath
  • Patent number: 8958447
    Abstract: Disclosed is a surgical laser system. The system includes a laser generator to generate laser radiation to cause water absorption levels that approximate water absorption levels achieved with a C02 laser, and one or more fibers coupled to the laser generator to deliver the generated laser radiation. In some embodiments, the laser generator is configured to generate radiation at multiple possible wavelengths in a range of between about 2.4 ?m to about 2.75 ?m.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: February 17, 2015
    Assignee: Lumenis Ltd.
    Inventors: Asa Fein, Alon Goldring
  • Patent number: 8891567
    Abstract: A semiconductor laser module having a substrate and having at least one semiconductor laser situated on the substrate, the substrate having a layer structure which includes at least one primary layer which establishes a thermal contact with the semiconductor laser. The semiconductor laser is designed in such a way that it emits heat pulses having a minimum specific heat of approximately 3 mJ per mm2, preferably approximately 5 mJ/mm2, and having a pulse duration of approximately 100 ?s to approximately 2,000 ?s, and the primary layer has a layer thickness which is between approximately 200 ?m and approximately 2,000 ?m, preferably between approximately 400 ?m and approximately 2,000 ?m.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: November 18, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Werner Herden, Hans-Jochen Schwarz, Wolfgang Pittroff
  • Patent number: 8885679
    Abstract: Embodiments of the invention describe integrating a phase shifting component into a cavity of a laser. Said phase shifter is capable of a continuous phase shift at a single wavelength over a large range (where the maximum energy consumption of the phase shifting component does not scale with the phase shifting range). In other words, said phase shifter is used to form a configurable optical cavity length for a laser. Embodiments of the invention thus utilize a plurality of optical cavity lengths—including one or more optical cavity lengths to potentially shift the phase of the output optical signal, to maintain a laser cavity's output wavelength and avoid spatial mode-hops in the presence of fluctuations such as temperature drift or changes to the drive current of the laser.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: November 11, 2014
    Assignee: Aurrion, Inc.
    Inventors: Jonathan Edgar Roth, Gregory Alan Fish, Erik Johan Norberg, Robert Silvio Guzzon, Brian R. Koch
  • Patent number: 8867582
    Abstract: A laser diode assembly includes a housing having a housing part and a mounting part that is connected to the housing part and that extends away from the housing part along an extension direction. A laser diode chip is disposed on the mounting part. The laser diode chip has, on a substrate, semiconductor layers with an active layer for emitting light. The housing part and the mounting part have a main body composed of copper and at least the housing part is steel-sheathed. A first solder layer having a thickness of greater than or equal to 3 ?m is arranged between the laser diode chip and the mounting part.
    Type: Grant
    Filed: April 4, 2013
    Date of Patent: October 21, 2014
    Assignee: OSRAM Opto Semiconductors GmbH
    Inventors: Uwe Strauss, Soenke Tautz, Alfred Lell, Karsten Auen, Clemens Vierheilig
  • 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
  • Publication number: 20140269794
    Abstract: The specification and drawings present an apparatus and a method for protecting lasers or other sources of high optical power from damage due to external sources of contamination using a concept of a sacrificial optical component and automatic laser shutdown based on a pressure indication of a substantial damage to the sacrificial optical component such as puncturing through that component.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventors: Michael W. Murray, Melvin J. Lima
  • Patent number: 8831057
    Abstract: In a laser device having at least one gas-purged laser resonator which is arranged in a purging gas circuit which has upstream of the laser resonator both a low pressure generator for generating a purging gas excess pressure in the purging gas circuit and, between the low pressure generator and the laser resonator, a cleaning device for cleaning the purging gas, the purging gas being air, according to the invention the purging gas circuit has downstream of the laser resonator between the laser resonator and the low pressure generator an intake opening which is permanently open towards the atmosphere, the purging gas pressure (p1) generated by the low pressure generator being greater than the atmospheric air pressure (p0).
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: September 9, 2014
    Assignee: TRUMPF Laser GmbH + Co. KG
    Inventors: Sven Schad, Lutz Schuler, Jürgen Mösner
  • Patent number: 8787412
    Abstract: Method for calibrating and tuning a part wise monotonically, continuously tunable semiconductor laser having a phase section and a first Bragg reflector section, through which sections a phase current and a first reflector current, respectively, are applied, which laser is not actively cooled, includes a) a calibration step, including obtaining at least two tuning lines along which tuning lines all combinations of phase and Bragg currents are stable operating points, identifying at least one reference stable operating point along a first one of the identified tuning lines at which operating point the laser emits light at a certain reference frequency, and storing at least one reference stable operating point; and b) a subsequent tuning step, during which the output frequency of the laser in relation to the reference frequency is controlled to a desired output frequency by translating the operating point of the laser along the first tuning line.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: July 22, 2014
    Assignee: Syntune AB
    Inventors: Urban Eriksson, Robert Lewén, Jan-Olof Wesström, Filip Öhman
  • Publication number: 20140146837
    Abstract: A semiconductor laser has an optical cavity comprising and active layer disposed between an n-side barrier layer and a p-side barrier layer. The active layer comprises alternating layers of a first and second material, and the n-side barrier layer and p-side barrier layer each comprise alternating layers of the first material and a third material. The materials are selected such that the layers of the second and third materials form quantum wells between the layers of the first material. A band gap Eg of the second material is arranged such that a proportion of electrons and holes that recombine across the band gap Eg recombine to emit photons at the lasing wavelength, the proportion decreasing with increasing temperature of the optical cavity.
    Type: Application
    Filed: May 9, 2012
    Publication date: May 29, 2014
    Applicant: UNIVERSITY OF SURREY
    Inventor: Alf Adams
  • 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: 8691598
    Abstract: Systems and methods for performing semiconductor laser annealing using dual loop control are disclosed. The first control loop operates at a first frequency and controls the output of the laser and controls the 1/f laser noise. The second control loop also controls the amount of output power in the laser and operates at second frequency lower than the first frequency. The second control loop measures the thermal emission of the wafer over an area the size of one or more die so that within-die emissivity variations are average out when determining the measured annealing temperature. The measured annealing temperature and an annealing temperature set point are used to generate the control signal for the second control loop.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: April 8, 2014
    Assignee: Ultratech, Inc.
    Inventors: James T. McWhirter, David Gaines, Joseph Lee, Paolo Zambon
  • Patent number: 8681826
    Abstract: A method for tuning a semiconductor laser including a plurality of wavelength selection portions, each of which has a periodic wavelength characteristic, including: controlling a value of a refractive index controlling means of the wavelength selection portions to achieve a desired output wavelength of the laser; and shifting the value when the value is equal to or excess of a predetermined value to a basal value side until achieving the desired output wavelength, the basal value being a value without applying refractive index variation by the refractive index controlling means, the predetermined value being a value for shifting one period of the periodic wavelength characteristic.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: March 25, 2014
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Hirokazu Tanaka, Tsutomu Ishikawa, Toyotoshi Machida
  • Publication number: 20140064309
    Abstract: In a laser device having at least one gas-purged laser resonator which is arranged in a purging gas circuit which has upstream of the laser resonator both a low pressure generator for generating a purging gas excess pressure in the purging gas circuit and, between the low pressure generator and the laser resonator, a cleaning device for cleaning the purging gas, the purging gas being air, according to the invention the purging gas circuit has downstream of the laser resonator between the laser resonator and the low pressure generator an intake opening which is permanently open towards the atmosphere, the purging gas pressure (p1) generated by the low pressure generator being greater than the atmospheric air pressure (p0).
    Type: Application
    Filed: April 19, 2012
    Publication date: March 6, 2014
    Applicant: TRUMPF LASER GMBH + CO. KG
    Inventors: Sven Schad, Lutz Schuler, Jürgen Mössner
  • 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: 8649408
    Abstract: According to one embodiment, a semiconductor laser device with high reliability and excellent heat dissipation is provided. The semiconductor laser device includes an active layer, a p-type semiconductor layer on the active layer, a pair of grooves formed by etching into the p-type semiconductor layer, a stripe sandwiched by the pair of grooves and having shape of ridge, and a pair of buried layers made of insulator to bury the grooves. The bottom surfaces of the grooves are shallower with an increase in distance from the stripe.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: February 11, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Rei Hashimoto, Maki Sugai, Jongil Hwang, Yasushi Hattori, Shinji Saito, Masaki Tohyama, Shinya Nunoue
  • Patent number: 8593504
    Abstract: Once an active video conference is set up and a user is viewing the active video conference at a video terminal, the video terminal looks for different events that indicate a change in focus of the user to or from the active video conference. For example, the user brings up another application and starts using the application or the user has minimized a window that is displaying the active video conference. The video terminal sends a change of focus message based on the event to a video conference bridge or another video terminal that is streaming the active video conference to the user. The video conference bridge/video terminal processes the message and changes video portion of the stream of the active video conference based on the message. The result is that there is improved use of bandwidth between the video terminal and the video conference bridge/video terminal.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: November 26, 2013
    Assignee: Avaya Inc.
    Inventors: Lin Lin, Moni Manor, Gregory T. Osterhout, Stephen R. Whynot
  • Patent number: 8559473
    Abstract: Disclosed is a surgical laser system. The system includes a laser generator to generate laser radiation to cause water absorption levels that approximate water absorption levels achieved with a CO2 laser, and one or more fibers coupled to the laser generator to deliver the generated laser radiation. In some embodiments, the laser generator is configured to generate radiation at multiple possible wavelengths in a range of between about 2.4 ?m to about 2.75 ?m.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 15, 2013
    Assignee: Lumenis Ltd.
    Inventors: Asa Fein, Alon Goldring
  • Patent number: 8548016
    Abstract: A tunable laser system having fine and coarse wavelength discrimination is provided. The tunable laser system includes a first filter having a first free spectral range (FSR) and a second filter having a second FSR different from the first FSR. The first filter provides a first series of pulses from a first portion of a laser output, and a second filter provides a second series of pulses from a second portion of the laser output. A processing system compares the first series of pulses and the second series of pulses to identify a series of markers, in which the markers are separated by a beat period of the first series of pulses and the second series of pulses. Advantageously, the series of markers may be used for mode-hop detection and/or for wavelength referencing.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: October 1, 2013
    Assignee: JDS Uniphase Corporation
    Inventors: Chris Wagner, Grant Tessaro
  • Patent number: 8532153
    Abstract: Thermal chirp compensation in a chirp managed laser. In one example embodiment, a laser package including a laser and an optical spectrum reshaper configured to convert frequency modulated optical signals from the laser into an amplitude modulated optical signals is provided. A thermal chirp compensation device is in communication with the laser package and a laser driver. The thermal chirp compensation device includes means for generating bias condition and temperature specific thermal chirp compensation signals that each corresponds to a predetermined level of thermal chirp that is induced in the laser by operating the laser at a particular bias condition and temperature.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: September 10, 2013
    Assignee: Finisar Corporation
    Inventors: Xueyan Zheng, Jianying Zhou, Vincent Bu, Daniel Mahgerefteh
  • Patent number: 8514901
    Abstract: Embodiments of silicon-based thermal energy transfer apparatus for gain medium crystal of a laser system are provided. For a disk-shaped crystal, the apparatus includes a silicon-based manifold and a silicon-based cover element. For a rectangular cuboid-shaped gain medium crystal, the apparatus includes a first silicon-based manifold, a second silicon-based manifold, and first and second conduit elements coupled between the first and second manifolds. For a right circular cylinder-shaped gain medium crystal, the apparatus includes a first silicon-based manifold, a second silicon-based manifold, and first and second conduit elements coupled between the first and second manifolds.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: August 20, 2013
    Inventor: Gerald Ho Kim
  • Patent number: 8498316
    Abstract: A laser device for intra-cavity frequency conversion, in particular, for the second harmonic generation, the device comprising a laser cavity, formed by the first and the second laser cavity end reflectors wherein the said laser cavity end reflectors are highly reflective for the radiation about the laser fundamental frequency and as such provide for a predetermined level of circulating inside the cavity fundamental frequency power; an active medium provided within the said laser cavity; at least one non-linear crystal, in particular, for the second harmonic generation provided within the same laser cavity; tuning means adapted for tuning at least one of laser cavity end reflectors; wherein at least one of the laser cavity end reflectors comprises an interferometric layout providing spectrally selective reflection for the radiation about the laser fundamental frequency with the value of reflectivity nearly to 100% within a spectral range close to the free spectrum range of the laser cavity and with a sufficie
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: July 30, 2013
    Inventor: Fedor Karpushko
  • Patent number: 8467426
    Abstract: A system and method for cooling an optical fiber includes a flexible heat sink member, a heat pipe evaporator, and a thermal storage medium. The flexible heat sink member is in thermal contact with the optical fiber. The heat pipe evaporator is configured to dissipate heat from the optical fiber. The thermal storage medium is in thermal contact with the flexible heat sink member and the heat pipe evaporator. The flexible heat sink member is configured to compensate for any mismatch in coefficient of thermal expansion between material of the optical fiber and material of the flexible heat sink member so as to provide radial compliance and to maintain direct thermal contact between the optical fiber and the flexible heat sink member.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: June 18, 2013
    Assignee: Raytheon Company
    Inventors: Joseph Ichkhan, John Schroeder, David A. Rockwell
  • Patent number: 8457173
    Abstract: An apparatus that includes a silicon-based support member and a silicon-based alignment structure is provided. The silicon-based alignment structure is received on a receiving surface of the support member. The alignment structure includes a first surface and a second surface parallel to and facing the first surface with a gap defined therebetween and configured to receive a light-emitting device inside the gap with the first surface and the second surface in contact with the light-emitting device such that, when a collimating rod lens is disposed on the alignment structure and over the gap, a longitudinal center line of the collimating rod lens is not aligned with a mid-point of the gap.
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: June 4, 2013
    Inventor: Gerald Ho Kim
  • Patent number: 8457499
    Abstract: A semiconductor laser drive apparatus comprises a bias current setting section (232) which sets a bias current value on the basis of the drive temperature so that the temperature characteristic of the bias current value with respect to the drive temperature may be a linear function having a slope except zero and a drive current setting section (233) for setting the drive current value on the basis of the drive temperature so that the temperature characteristic of the drive current value with respect to the drive temperature may be a function having a slope except zero. The temperature characteristic of the bias current and that of the drive current are functions different from each other. With this, low cost, space-saving, and power-saving of a semiconductor laser are achieved, and a semiconductor laser drive apparatus enabling a good transmission characteristic on the reception side and a high optical output over the whole drive temperature range when driving the semiconductor laser can be provided.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: June 4, 2013
    Assignee: OMRON Corporation
    Inventors: Kentaro Hamana, Akira Enami, Yukari Terakawa, Keisuke Uno, Hayami Hosokawa
  • Patent number: 8442080
    Abstract: The performance of a laser scanner is optimized in the field by automatically determining appropriate laser parameters for the scan location. A laser control system uses information such as the environmental temperature to select an appropriate range of start points for various laser parameters, such as pump temperature and laser currents. Test pulses over that range can be used to determine optimal operating parameters.
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: May 14, 2013
    Assignee: Leica Geosystems AG
    Inventors: Gregory C. Walsh, Ralph Storz
  • Patent number: 8369712
    Abstract: An improved precompensation circuit includes a greatly improved differentiator in the dispersion precompensation path, a preprocessor in the dispersion precompensation path for reducing f2?f1 type Composite Second Order (CSO) distortion, and a broadband phase shifter for compensating undesired vector interaction between the laser predistortion and dispersion compensation.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: February 5, 2013
    Assignee: Harmonic Inc.
    Inventors: Wei Huang, Thomas C. Lam, Li-Ping Chen
  • Patent number: 8300669
    Abstract: A control system and apparatus for use with an ultra-fast laser is provided. In another aspect of the present invention, the apparatus includes a laser, pulse shaper, detection device and control system. A multiphoton intrapulse interference method is used to characterize the spectral phase of laser pulses and to compensate any distortions in an additional aspect of the present invention. In another aspect of the present invention, a system employs multiphoton intrapulse interference phase scan. Furthermore, another aspect of the present invention locates a pulse shaper and/or MIIPS unit between a laser oscillator and an output of a laser amplifier.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: October 30, 2012
    Assignee: Board of Trustees of Michigan State University
    Inventors: Marcos Dantus, Igor Pastirk, Vadim Lozovoy, Matthew Comstock
  • Patent number: 8279903
    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: February 11, 2011
    Date of Patent: October 2, 2012
    Assignee: Imra America, Inc.
    Inventors: Lawrence Shah, James M. Bovatsek, Alan Y. Arai, Tadashi Yamamoto, Rajesh S. Patel, Donald J. Harter
  • Patent number: 8265105
    Abstract: The present invention is directed to methods and apparatuses for performing temporal scanning using ultra-short pulsewidth lasers in which only minimal (micro-scale) mechanical movement is required. The invention also relates to methods for obtaining high-accuracy timing calibration, on the order of femtoseconds. A dual laser system is disclosed in which the cavity of one or more of the lasers is dithered, by using a piezoelectric element. A Fabry-Perot etalon is used to generate a sequence of timing pulses used in conjunction with a laser beam produced by the laser having the dithered laser cavity. A correlator correlates a laser pulse from one of the lasers with the sequence of timing pulses to produce a calibrated time scale.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: September 11, 2012
    Assignee: IMRA America, Inc.
    Inventors: Gregg D. Sucha, Martin E. Fermann, Donald J. Harter
  • Patent number: 8249122
    Abstract: An etched-facet single lateral mode semiconductor photonic device is fabricated by depositing an anti reflective coating on the etched facet, and depositing a reflectivity modifying coating in a spatially controlled manner to modify the spatial performance of the emitted beam.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: August 21, 2012
    Assignee: Binoptics Corporation
    Inventors: Alex A. Behfar, Alfred T. Schremer
  • Patent number: 8238392
    Abstract: A temperature controller for a gas laser which controls temperatures of a plurality of temperature-controlled apparatuses including a first temperature-controlled portion requiring a high-precision temperature-control and a second temperature-controlled portion requiring a low-precision temperature-control as compared with the first temperature-controlled portion and allowing a temperature-control with a low or high temperature as compared with the first temperature-controlled portion, comprises a first temperature control portion generating a cooling agent or a heating agent for adjusting a temperature of each first temperature-controlled portion, a second temperature control portion generating a cooling agent or a heating agent for adjusting a temperature of each second temperature-controlled portion, a first piping system connecting the first temperature control portion and each first temperature-controlled portion in parallel, and a second piping system connecting the second temperature control portion an
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: August 7, 2012
    Assignee: Gigaphoton Inc.
    Inventors: Yukio Watanabe, Hideyuki Hayashi, Kouji Kakizaki, Michio Shinozaki, Hideo Hoshino
  • Patent number: 8238401
    Abstract: An apparatus that includes a first diode laser and a silicon-based support structure is provided. The first diode laser is configured to emit a first laser beam when powered. The support structure includes a silicon-based support plate, a silicon-based first fin structure, and a silicon-based second fin structure. The support plate has a first primary surface and a second primary surface opposite the first primary surface. The first fin structure has a first primary surface, a second primary surface opposite the first primary surface, and a plurality of edges between the first and the second primary surfaces including a first edge and a second edge opposite the first edge. The first fin structure is physically coupled to the support plate with the first edge of the first fin structure attached to the first primary surface of the support plate.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: August 7, 2012
    Inventor: Gerald Ho Kim
  • Patent number: 8233511
    Abstract: A high average power laser system with modulated gain suppression includes an input aperture associated with a first laser beam extraction path and an output aperture associated with the first laser beam extraction path. The system also includes a pinhole creation laser having an optical output directed along a pinhole creation path and an absorbing material positioned along both the first laser beam extraction path and the pinhole creation path. The system further includes a mechanism operable to translate the absorbing material in a direction crossing the first laser beam extraction laser path and a controller operable to modulate the second laser beam.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: July 31, 2012
    Assignee: Lawrence Livermore National Security, LLC
    Inventor: Andrew James Bayramian
  • Patent number: 8218589
    Abstract: A high-energy laser weapon system in which the high-energy laser beam itself is used to correct for atmospheric fluctuations thereby replacing a separate beacon illuminator system. The high-energy laser is turned off (negative pulse) periodically for a very short period giving a wavefront sensor an opportunity to measure the return of the high-energy laser beam from the target. A wavefront sensor drives a deformable mirror based on this return signal avoiding wavelength anisoplanatism. In addition, the high-energy laser weapon can be snapped ahead of the path of the target during the negative pulse to avoid tilt anisoplanitism.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: July 10, 2012
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Patrick Saunders
  • Patent number: 8199785
    Abstract: Thermal chirp compensation in a chirp managed laser. In one example embodiment, a method for thermal chirp compensation in a chirp managed laser (CML) includes several acts. First, a first bias condition and temperature is selected. Next, a first thermal chirp compensation signal is generated. Then, the laser is driven by biasing a first input drive signal with the first thermal chirp compensation signal. Next, a second bias condition and temperature is selected. Then, a second thermal chirp compensation signal is generated. Finally, the laser is driven by biasing a second input drive signal with the second thermal chirp compensation signal.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: June 12, 2012
    Assignee: Finisar Corporation
    Inventors: Xueyan Zheng, Jianying Zhou, Vincent Bu, Daniel Mahgerefteh