Power Supply Patents (Class 372/29.012)
  • Patent number: 10651626
    Abstract: The description relates to laser control. One example can include a laser that has a laser emitter configured to generate a laser beam for intervals of time (e.g., pixel times). The laser can have a compensation and control component configured to receive a predicted laser emitter temperature of the laser emitter, obtain a desired optical power for an interval, and compute a compensated electrical current for the interval utilizing multiple light to current look up tables. Individual light to current look up tables can relate to specific laser emitter temperatures.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: May 12, 2020
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Mark Champion, Algird M. Gudaitis
  • Patent number: 10511144
    Abstract: The present invention comprises: a light-emitting element group configured from columns of serially connected light-emitting elements, one of the ends from each of the columns of the light-emitting elements being collectively connected to a power source; current control elements, provided to correspond to the columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the columns of the light-emitting elements reach a threshold value or lower.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: December 17, 2019
    Assignee: SHIMADZU CORPORATION
    Inventors: Shingo Uno, Tomoyuki Hiroki, Koji Tojo, Jiro Saikawa, Naoya Ishigaki, Junki Sakamoto
  • Patent number: 10476228
    Abstract: The present invention comprises: a light-emitting element group configured from columns of serially connected light-emitting elements, one of the ends from each of the columns of the light-emitting elements being collectively connected to a power source; current control elements, provided to correspond to the columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the columns of the light-emitting elements reach a threshold value or lower.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 12, 2019
    Assignee: SHIMADZU CORPORATION
    Inventors: Shingo Uno, Tomoyuki Hiroki, Koji Tojo, Jiro Saikawa, Naoya Ishigaki, Junki Sakamoto
  • Patent number: 10361536
    Abstract: A power supply apparatus includes a power supply for supplying power to a laser oscillator. A reactor has one end serially connected to the laser oscillator and another end serially connected to the power supply, and a parallel diode configures a closed circuit for serial connection of the laser oscillator and the reactor. A current detector detects a current flowing in the reactor, and a first switching device is connected in parallel to the laser oscillator and drives the laser oscillator with pulses. An energy consumption circuit prefetches a current command value based on a control signal from a controller upon driving the laser oscillator with pulses, and when the current command value is smaller than a current command value of a previous pulse, the energy consumption circuit consumes energy until the current command value reaches a predetermined target current value.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: July 23, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Tsuda, Taichiro Tamida, Takashi Hashimoto, Takeshi Morimoto
  • Patent number: 10326255
    Abstract: A laser device includes a light-emitting unit that generates a laser beam, an amplification unit that amplifies the laser beam generated by the light-emitting unit, a power supply unit that supplies power for generating the laser beam to the light-emitting unit, a plate-like cooling unit including a first cooling surface and a second cooling surface positioned opposite to the first cooling surface, and a housing in which the light-emitting unit, the amplification unit, the power supply unit, and the cooling unit are housed. The power supply unit and the light-emitting unit are arranged adjacent to the first cooling surface of the cooling unit. The amplification unit is arranged adjacent to the second cooling surface of the cooling unit.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: June 18, 2019
    Assignee: FANUC CORPORATION
    Inventors: Masahiro Honda, Munekazu Matsuda
  • Patent number: 10254159
    Abstract: A fiber optic sensor interrogation system with inbuilt passive power limiting capability that provides improved safety performance for use in explosive atmospheres.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: April 9, 2019
    Assignee: Halliburton Energy Services, Inc.
    Inventors: David A. Barfoot, Mikko Jaaskelainen
  • Patent number: 10141716
    Abstract: A laser diode firing circuit for a light detection and ranging device is disclosed. The firing circuit includes a laser diode coupled in series to a transistor, such that current through the laser diode is controlled by the transistor. The laser diode is configured to emit a pulse of light in response to current flowing through the laser diode. The firing circuit includes a capacitor that is configured to charge via a charging path that includes an inductor and to discharge via a discharge path that includes the laser diode. The transistor controlling current through the laser diode can be a Gallium nitride field effect transistor.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: November 27, 2018
    Assignee: Waymo LLC
    Inventors: Samuel William Lenius, Pierre-yves Droz
  • Patent number: 9843158
    Abstract: The present application provides an optical module comprising: a golden finger, a MAC chip, a switch circuit, a laser driver, and a laser. A first output terminal of the MAC chip is connected to a first input terminal of the laser driver for inputting burst controlling signal thereto; a second output terminal of the MAC chip is connected to a first input terminal of the switch circuit for inputting cut-off controlling signal thereto; a cut-off controlling pin of the golden finger is connected to a second input terminal of the switch circuit for inputting cut-off controlling signal thereto; and an output terminal of the switch circuit is connected to a second input terminal of the laser driver. The switch circuit is used to connect the first or the second input terminal of the switch circuit with the output terminal. The cut-off controlling signal controls the switch-off of the laser.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: December 12, 2017
    Assignees: HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES CO., LTD., HISENSE BROADBAND MULTIMEDIA TECHNOLOGIES, LTD.
    Inventors: Li Wang, Long Zheng, Hua Zhang
  • Patent number: 9693413
    Abstract: An apparatus for controlling an LED-based lighting system includes a comparison circuit configured to compare at least one signal representative of a supply voltage with at least one other signal representative of a series voltage drop over at least some of a plurality of LEDs connected electrically in series. The apparatus includes a controller, connected to the comparison circuit; and a power section connected to the controller. The power section is configured to operate at least one switch such that the number of LEDs operated in series may be changed in response to the comparison circuit.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: June 27, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventor: Ihor Lys
  • Patent number: 9570648
    Abstract: Optoelectronic devices (e.g., optical proximity sensors), methods for fabricating optoelectronic devices, and systems including optoelectronic devices, are described herein. An optoelectronic device includes a light detector die that includes a light detector sensor area. A light source die is attached to a portion of the light detector die that does not include the light detector sensor area. An opaque barrier is formed between the light detector sensor area and the light source die, and a light transmissive material encapsulates the light detector sensor area and the light source die. Rather than requiring a separate base substrate (e.g., a PCB substrate) to which are connected a light source die and a light detector die, the light source die is connected to the light detector die, such that the light detector die acts as the base for the finished optoelectronic device. This provides for cost reductions and reduces the total package footprint.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: February 14, 2017
    Assignee: INTERSIL AMERICAS LLC
    Inventors: Sri Ganesh A. Tharumalingam, Seck Jiong Wong
  • Patent number: 9166695
    Abstract: An optical frequency locking method tunes each of a plurality of narrow-band optical channel transmit signals (having arbitrary channel frequency spacings) to a dedicated optical channel frequency. The method includes tapping-off a portion of the optical power of the respective channel transmit signal and filtering the tapped-off channel transmit signal using at least one optical filter device. The method also includes monitoring, as an optical input signal, the optical power of the respective channel transmit signal supplied to the at least one optical filter device and, as an optical output signal, the optical power of the filtered channel transmit signal. The method further includes tuning, within a predetermined locking range for the dedicated optical channel frequency, the optical frequency of the respective channel transmit signal such that a predetermined value for the ratio of the output signal and the input signal is reached.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: October 20, 2015
    Assignee: ADVA Optical Networking SE
    Inventors: Michael Eiselt, Markus Roppelt
  • Patent number: 9001857
    Abstract: Provided are assemblies and processes for activating light emitting devices. A first current sink is in electrical communication with a common source through a current node and configured to draw a first current through the current node in response to a respective control signal. A second current sink is also provided in electrical communication with the current node and in parallel with the first current sink, also configured to draw a second current through the current node in response to a respective control signal. An aggregate current is drawn through the array, determined as a combination of the first and second currents. A commanded current from the first current sink can be shunted around the second array and the second current sink, providing a capability to series both the first and second laser diode light-emitting arrays, while simultaneously drawing different current amplitudes through each array from a common potential source.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: April 7, 2015
    Assignee: Raytheon Company
    Inventors: Michael S. Lackey, Thomas H. Alford, Robert F. Stiffler, David Filgas
  • Patent number: 8958445
    Abstract: A DC-coupled laser drive circuit (1) includes (i) a voltage drop section (14) provided between a power source and a pre-driver (12) and (ii) a voltage drop amount controlling section (16) for controlling, according to an output of the pre-driver (12), an amount of a voltage drop in the voltage drop section (14).
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: February 17, 2015
    Assignee: Fujikura Ltd.
    Inventor: Tatsuo Kubo
  • 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: 8913637
    Abstract: A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use of a more compact, low-voltage batteries.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: December 16, 2014
    Assignee: Daylight Solutions, Inc.
    Inventors: Rob Marsland, Timothy Day
  • Publication number: 20140362882
    Abstract: An improved laser safety shutter is provided for the main supply power to the laser diode to be routed through an electronic shutter that prevents the passing of the supply power to the laser diodes to achieve laser shutdown or in the event of a control power failure. The main power is routed through a rectifier to convert the incoming alternating current (AC) feed to direct current (DC) power. A switching array operates in an alternating cycle so as to provide AC power to be transformed and passed along to the laser diode pump on the load side of the transformer. When shut down of the laser is desired or when power to the controller fails, the switches stop operating and the resultant DC power cannot be passed by the transformer effectively cutting the supply power to the laser diodes.
    Type: Application
    Filed: June 6, 2013
    Publication date: December 11, 2014
    Inventors: Francesco Sgandurra, Luca DiStefano
  • 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: 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
  • Publication number: 20140233594
    Abstract: A DC-coupled laser drive circuit (1) includes (i) a voltage drop section (14) provided between a power source and a pre-driver (12) and (ii) a voltage drop amount controlling section (16) for controlling, according to an output of the pre-driver (12), an amount of a voltage drop in the voltage drop section (14).
    Type: Application
    Filed: April 2, 2013
    Publication date: August 21, 2014
    Applicant: FUJIKURA LTD.
    Inventor: FUJIKURA LTD.
  • Patent number: 8811436
    Abstract: A laser apparatus may include a master oscillator configured to output a laser beam, at least one amplifier disposed in a beam path of the laser beam from the master oscillator, at least one power source for applying a high-frequency voltage to the at least one amplifier, and a controller for varying the high-frequency voltage to be applied to the at least one amplifier from the at least one power source.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: August 19, 2014
    Assignee: Gigaphoton Inc
    Inventors: Kenichi Miyao, Motoki Niwano, Osamu Wakabayashi
  • Patent number: 8792522
    Abstract: The invention can be used for setting up high energy and high average power soft x-ray laser equipments. The apparatus of the present invention is provided with a capillary discharge, wherein the spark gap (3) is disposed in water and breakdown of the spark gap (3) is triggered and synchronized by a laser source (16). In order to complete the synchronizing step the apparatus comprises a transformer (12) for monitoring and controlling the decrease of the charging current of the generator, preferably a Marx generator (7), and a triggering circuit (14). The time dependent control of the laser source (16) generating the breakdown of the spark gap (3) is achieved by the triggering circuit (14).
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: July 29, 2014
    Assignee: Pécsi Tudományegyetem
    Inventors: Gábor Almási, Mátyás Kiss, Szergej Kuhlevszkij, Imre Sánta, Sándor Szatmári, János Szász
  • Patent number: 8767784
    Abstract: A driver device for a laser includes a control device configured to generate a control current, an NPN differential amplifier connected to the control device and configured to superimpose a modulation current onto the control current to generate a combined current, and a laser activation switch coupled to the output of the NPN differential amplifier, the laser activation switch operating the laser utilizing the combined current. Also described herein is a communication system including a driver device.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: July 1, 2014
    Assignee: Tyco Electronics Corporation
    Inventor: Iain Ross Mactaggart
  • Publication number: 20140081171
    Abstract: Disclosed herein is an apparatus for generating a laser. The apparatus includes, on an upper surface of a PCB, a display unit (50) which displays a charge state and an intensity of laser, a switch unit (60) which control power, the intensity of the laser and the emission of the laser, a safety unit (80) which includes contact point parts, and a control unit (70). The apparatus includes, on a rear surface of the PCB, a reflector (10) which has first and second spaces, a xenon tube (12) which emits light, a crystal rod (11) which amplifies the light to generate a laser, a focusing lens (15) which focuses the laser and forms a focus, a focusing lens installation part (13), a capacitor (20) which applies voltage to the xenon tube, a drive unit (90) which charges the capacitor, and a battery (30) which supplies power to the drive unit.
    Type: Application
    Filed: March 9, 2012
    Publication date: March 20, 2014
    Applicant: GTC CO., LTD.
    Inventors: Deog Yong Kim, Sang Do Kim
  • Publication number: 20140064305
    Abstract: A system is provided for combining laser light sources. The system includes: a stack of laser diode bar arrays, comprising two or more laser diode bar arrays, each laser diode bar array having multiple laser diodes; a multimode optical fiber; and a plurality of optical elements disposed between the stack of laser diode bar arrays and the multimode optical fiber, configured to direct light from the stack of laser diode bar arrays to the multimode optical fibers, the plurality of optical elements further including: a plurality of fast-axis collimating (FAC) lenses, wherein at least one FAC lens of the plurality of FAC lenses corresponds to each laser diode bar array. At least one FAC lens of the plurality of FAC lenses is misaligned with respect to the corresponding laser diode bar array.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 6, 2014
    Applicant: OPTICAL ENGINES, INC.
    Inventors: Donald L. Sipes, JR., Daniel Scott Schulz
  • Patent number: 8611384
    Abstract: Embodiments of the present invention provide a system for increasing an operational life of a VCSEL. The system can include control circuitry for reducing an amount of bias current at high temperatures and increasing a power of the laser at low temperatures. This control circuitry can further include at least one of a temperature sensor, a Field Programmable Gate Array, a read only memory module, and an electrically erasable programmable read only memory module (EEPROM). In alternate embodiments, the control circuitry can further include a lookup table that sets the bias current depending on a temperature of the laser. The laser can be part of an optoelectronic transceiver module which can include, by way of example and not limitation, SFP, XFP, X2, XAUI, XENPAK, XPAK, GBIC, 8G, 16G, and other optoelectronic modules.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: December 17, 2013
    Assignee: Finisar Corporation
    Inventor: Jimmy A. Tatum
  • Patent number: 8548018
    Abstract: A command apparatus (10) for a plurality of laser power supplies (11, 12) comprises: a command generating section (5) generating commands for the laser power supplies; and a separating section (36) separating the generated commands into a bias command, an output command, an offset command and a gain command, wherein the bias command and the output command are common to the laser power supplies, the offset command and the gain command are defined at least in accordance with the discharge tubes corresponding to the laser power supplies respectively, wherein the command apparatus further comprises a transmitting section (37) transmitting, to the laser power supplies, the bias and the output command which are common to the laser power supplies and, transmitting the offset and the gain command defined at least in accordance with the discharge tubes corresponding to the laser power supplies respectively, corresponding to the laser power supplies.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: October 1, 2013
    Assignee: FANUC Corporation
    Inventors: Masahiro Honda, Hajime Ikemoto
  • Patent number: 8542711
    Abstract: A laser diode driving device (1) of the present invention includes: a variable DC power supply (3) for outputting a voltage for driving laser diodes (LD1 to LDn); a current driving element (4) for causing a current If to flow; a current control section (5) for controlling (i) turning on and off of the current driving element (4) and (ii) the amount of the current If; and a power supply control section (7) for controlling an output voltage of the variable DC power supply (3). The power supply control section (7) controls, on the basis of If-Vf characteristic data (D2), voltage drop characteristic data (D3), and Vds setting data (D4) all stored in a memory section (8), the output voltage of the variable DC power supply (3) so that the current driving element (4) has a constant inter-terminal voltage regardless of the amount of the current If.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: September 24, 2013
    Assignee: Fujikura Ltd.
    Inventor: Kotaro Shimokoshi
  • Publication number: 20130170512
    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: Application
    Filed: December 28, 2011
    Publication date: July 4, 2013
    Applicant: Coherent, Inc.
    Inventors: David P. SCHMELZER, W. Shef ROBOTHAM, JR., Frederick W. HAUER, Joel FONTANELLA
  • Patent number: 8442081
    Abstract: A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use of a more compact, low-voltage batteries.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: May 14, 2013
    Assignee: Daylight Solutions, Inc.
    Inventors: Rob Marsland, Jr., Timothy Day
  • Patent number: 8306076
    Abstract: An LD driver is disclosed where the power dissipation is reduced without enlarging the circuit scale. The LD driver, which drives a tunable LD including a SG-DGB region, a CSG-DBR region, and an SOA region, includes a DC/DC converter connected to current sources or voltage sources each coupled with at least two regions of the SG-DFB, CSG-DBR and SOA regions, and a voltage controller to control the output of the DC/DC converter which is commonly provided to the current sources or the voltage sources. The voltage controller independently monitors the bias conditions of the at least two regions above, and sets the output of the DC/DC converter so as to exceed a largest voltage among voltages currently provided to respective regions by a preset margin to operate the current sources or the voltage sources normally.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: November 6, 2012
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tomoko Ikagawa
  • Patent number: 8279902
    Abstract: A laser device comprises: first and second laser excitation regions that are disposed in series each other; a first power supply unit (PSU1) that injects a first energy into the first laser excitation region; and a second power supply unit (PSU2) that injects a second energy into the second laser excitation region, wherein the first power supply unit injects a predetermined excitation energy equal to or higher than a critical injection energy at which laser oscillation starts into the first laser excitation region as the first energy and the second power supply unit injects energy between a preliminary excitation energy needed for preliminary discharge and the critical injection energy into the second laser excitation region as the second energy, so as to control laser power. Consequently, the laser device can stably output very low laser even though it is a high power laser.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: October 2, 2012
    Assignee: FANUC Corporation
    Inventors: Masahiro Honda, Koji Hayano, Atsushi Mori
  • Patent number: 8199789
    Abstract: RF power is transmitted to a CO2 gas discharge laser form a source of RF power via a series combination of transmission line sections. The lengths and characteristic impedances of the transmission line sections are selected to transform the impedance of the RF power source to the operating impedance of the laser.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: June 12, 2012
    Assignee: Coherent, Inc.
    Inventors: Frederick W. Hauer, Patrick T. Tracy, R. Russel Austin
  • Patent number: 8189630
    Abstract: A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use of a more compact, low-voltage batteries.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: May 29, 2012
    Assignee: Daylight Solutions, Inc.
    Inventors: Rob Marsland, Jr., Timothy Day
  • Patent number: 8095015
    Abstract: A method to reduce a peak power consumption of an optical transceiver including a thermoelectric cooler (TEC) is disclosed. The transceiver includes three power units, one of which powers the temperature control unit including the TEC driver and the TEC, second one of which powers the transmitter unit including an LD and an LD driver, and the last of which powers the receiver unit. Once the transceiver is set in the host system, the transceiver first activates the first and second power units to start up the temperature control unit and the transmitter unit, and subsequently, the transceiver sets up the third power unit after the temperature of the LD is stabilized at a target temperature.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: January 10, 2012
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Moriyasu Ichino
  • Patent number: 8000368
    Abstract: Many approaches to tunable lasers use an array of DFBs, where each element of the array has a different wavelength. In some operations one element of the array is activated at a time depending on the desired wavelength. For modulated applications, an RF voltage is applied to a specific element of the DFB array, generally using an RF switch. In standard configurations, the demands on the switch are relatively difficult, generally requiring low RF insertion loss and good high frequency performance to 10 GHz. The DFB arrays are generally common cathode or common anode, depending on the type of the substrate used to fabricate the devices. Described herein is an array with a common cathode or anode configuration using a MEMS based switch that shorts the selected laser to RF ground. With this topology, preferably the off-state capacitance should be low with the MEMS switch.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: August 16, 2011
    Assignee: Santur Corporation
    Inventors: Bardia Pezeshki, Raghuram Narayan
  • Patent number: 7970037
    Abstract: RF power is transmitted to a CO2 gas discharge laser form a source of RF power via a series combination of transmission line sections. The lengths and characteristic impedances of the transmission line sections are selected to transform the impedance of the RF power source to the operating impedance of the laser.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: June 28, 2011
    Assignee: Coherent, Inc.
    Inventors: Frederick W. Hauer, Patrick T. Tracy, R. Russel Austin
  • Publication number: 20110149363
    Abstract: A laser radar device adapted to ensure that the output from the laser is eye-safe. A means for applying spatial dither to the output of the laser source, such as a moveable optical arrangement. This causes the point of focus of the transmitted beam to traverse a target area by small amounts, reducing the overall radiation exposure at any particular point of focus, but having negligible impact on wind speed measurement for example. Alternative arrangements for ensuring eye-safety include periodically reducing the laser power density, gating the output or altering the focussing of the transmitted beam.
    Type: Application
    Filed: August 12, 2009
    Publication date: June 23, 2011
    Applicant: QINETIQ LIMITED
    Inventors: Michael Harris, Steven Michael Stone, Andrew Lewin
  • Patent number: 7920608
    Abstract: A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use of more compact, low-voltage batteries.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: April 5, 2011
    Assignee: Daylight Solutions, Inc.
    Inventors: Rob Marsland, Jr., Timothy Day
  • Patent number: 7897895
    Abstract: An on-the-fly analog switching method and system for providing a switching time of less than one second between energy levels and laser heads for laser shock peening applications. An analog switch is used with variable resistance devices that produce a switching time of less than one second. One advantage of the present invention is that a switching time of less than one second is provided which provides for an energy and time efficient system. The laser shock peening process is never delayed for switching purposes as the switching occurs during the standard pause between treated linear areas.
    Type: Grant
    Filed: May 1, 2006
    Date of Patent: March 1, 2011
    Assignee: General Electric Company
    Inventor: Wayne Lawrence
  • Patent number: 7889772
    Abstract: A laser output power command determination value from a controller (17) is input to an upper limit current determination unit (32), and an upper limit current value to be decided based on the laser output power command determination value is determined. Then, a second comparator (30) compares a command current value determined from the laser output power command determination value and a laser output power command determination value measured with a power monitor (13), with an upper limit current value determined with a upper limit current determination unit (32). The second comparator (30) determines a command current value when the upper limit current value is greater than the command current value and the upper limit current value when the command current value is greater than the upper limit current value, as a reference current value, by which reference current value a current to be supplied to pumping means is configured to be controlled.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: February 15, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshiki Koshimae, Toshiaki Watanabe, Takeshi Morimoto
  • Patent number: 7876794
    Abstract: The present invention discloses a laser light source for implementing pulsed oscillation of laser light, which has a laser cavity in which a laser medium for generating emitted light with supply of excitation energy is placed on a resonance path; an excitation device for continuously supplying excitation energy to the laser medium; a monitor part for monitoring a power of light extracted at a middle point of the path of the cavity from the laser medium in accordance with the supply of the excitation energy by the excitation device; a Q-switch for modulating a cavity loss of the laser cavity; and a control part for performing such control as to stabilize a peak power or an energy of laser light pulses outputted in a state in which the cavity loss of the laser cavity is set at a second predetermined loss for oscillation of high-power pulses, based on the power of the emitted light monitored by the monitor part in a state in which the cavity loss of the laser cavity is set at a first predetermined loss for non-o
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: January 25, 2011
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Motoki Kakui
  • Patent number: 7869477
    Abstract: Continuous wave laser diodes are able to be operated so as to achieve a high power pulsed output by operationally exercising them using a subnanosecond input pulse having an IV (power) amplitude characteristic at or exceeding a particular derived power (IV) threshold. Injection current on the order of 1 Amp and an operational voltage in the range of 4 Volts causes a CW laser to define a pulsed output in the 200 mV to 500 mV range. CW lasers having these output characteristics are coupled to mathematically defined branched pathways in order to construct an optical timing device relying on optical pulses traversing optical pathways at the speed of light. Pathway length is precisely controlled in order to define timing intervals relying solely on an optical path length and a known traversal speed.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: January 11, 2011
    Assignee: LightTime, LLC
    Inventor: James P. Siepmann
  • Patent number: 7848369
    Abstract: A modulator drive circuit provides a modulator drive signal to modulate an optical signal for transport across a network infrastructure. The modulator drive circuit powered by an adjustable voltage source, such that the modulator drive signal is generated from a data signal and the adjustable voltage source, an AC component of the modulator drive signal being derived from the data signal while a DC component of the modulator drive signal being derived from the adjustable voltage source. An array of such modulator drive circuits are provided on a single substrate.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: December 7, 2010
    Assignee: Infinera Corporation
    Inventors: Jeffrey S. Bostak, Ting-Kuang Chiang, Michael Kauffman
  • Patent number: 7835412
    Abstract: A control system for a laser source driven by a direct current drive voltage includes a system control board, a laser driver, and a power stabilizing circuit. The system control board is configured to output a control signal based on input data. The laser driver is coupled to the laser source and to the system control board. The laser driver is configured to drive the laser source with the drive voltage to generate a laser beam modulated according to the control signal. The power stabilizing circuit is configured to regulate the drive voltage to a given constant level. The power stabilizing circuit includes a first circuit and a second circuit. The first circuit is configured to boost the drive voltage to a level exceeding the given constant level. The second circuit is configured to limit the boosted drive voltage to the given constant level.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: November 16, 2010
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasuhiro Abe
  • Patent number: 7830935
    Abstract: A laser (10) provided with a discharge activation power supply (11) supplied with power from a 3-phase AC power line, the discharge activation power supply (11) provided inside it with three first capacitors (12a, 12b, and 12c), the laser (10) including an external ground fault protection device comprising a voltage measuring unit using the first capacitors (12a, 12b, and 12c) to measure voltages between the phases of the 3-phase AC power line and the ground and a power breaking unit (18) comparing the values of voltages measured by the voltage measuring unit and a predetermined threshold and breaking the supply of power from the 3-phase AC power line to the power supply (11) when the value of a voltage exceeds the threshold.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: November 9, 2010
    Assignee: Fanuc Ltd
    Inventors: Minoru Ando, Eiji Kobayashi, Satoshi Kagiwada
  • Patent number: 7801191
    Abstract: In a semiconductor laser device, in a case where an emission direction of a laser beam from a semiconductor laser element portion is a front side, a first front end of a first lead is arranged rearward beyond a first rear end of a second heatsink, and a second surface portion of the second heatsink electrically connected to the semiconductor laser element portion is electrically connected to the first front end.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: September 21, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Yasuyuki Bessho
  • Patent number: 7672345
    Abstract: A drive signal for driving a semiconductor laser is generated on the basis of an image signal inputted in synchronism with a pixel clock. A bias signal to the semiconductor laser is generated at a timing earlier than the drive signal by a predetermined time. The bias signal is disabled in synchronism with the leading edge of the drive signal.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: March 2, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tsuyoshi Moriyama
  • Patent number: 7630421
    Abstract: A laser beam irradiation apparatus includes an oscillation unit, an acousto-optic deflection unit for deflecting a laser beam oscillated by the oscillation unit, a condenser for condensing the deflected laser beam, and a control unit. The control unit determines an actual output power of the laser beam based on a light reception signal received from laser beam output detection means in response to a control signal for controlling a deflection angle adjustment unit of the deflection unit. Then, the control unit arithmetically operates the ratio of an actual output power corresponding to the control signal with reference to the lowest value of the actual output power. Further, the control unit arithmetically operates a correction value corresponding to the ratio of the actual output power to produce a control map and controls the output adjustment unit based on the control map.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: December 8, 2009
    Assignee: Disco Corporation
    Inventors: Yutaka Kobayashi, Kouichi Nehashi
  • Patent number: 7609734
    Abstract: Embodiments of the present invention are directed to current driver circuits and methods for driving a load. The current driver circuit includes a first transistor (Q1) and a second transistor (Q2) each having a gate, a drain and a source. The drain of the second transistor (Q2) forms the output of the current driver circuit. The first and second transistors (Q1) and (Q2) function as a current mirror when the gates of the first and second transistors (Q1) and (Q2) are selectively connected together. The current driver circuit also includes a current source, a load mimic circuit, and a control loop (e.g., including an op-amp), which are configured to cause the voltage at the drain of the first transistor (Q1) to substantially equal the voltage at the output of the current driver circuit.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: October 27, 2009
    Assignee: Intersil Americas Inc.
    Inventors: Theodore D. Rees, Anatoly Aranovsky
  • Patent number: 7564881
    Abstract: The invention discloses an optical transmission module with digital adjustment and method thereof. The module includes a laser (21), a laser driver (22), an automatic power adjustment circuit (23), an automatic temperature adjustment circuit (24), a digital adjustment circuit (25) and a memory (26). The digital adjustment circuit, consisted of a digital-to-analog converter or a digital adjustment potentiometer, receives a digital adjustment signal and outputs, respectively, a extinction ratio adjustment signal and a cross point adjustment signal to the laser driver, an optical power adjustment signal to the automatic power adjustment circuit and an optical wavelength adjustment signal to the automatic temperature adjustment circuit. The memory stores data, using for on-line adjustment of the optical transmission module, at least including parameters of said optical transmission module and said laser emitting optical power parameters, to be reported upward.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: July 21, 2009
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Tianhai Chang