Amplitude Patents (Class 372/31)
  • Patent number: 10559943
    Abstract: A laser assembly (10) for generating an assembly output beam (12) includes a laser subassembly (16) that emits a plurality of spaced apart laser beams (20), a beam adjuster (42), a transform lens (44A), a beam combiner (46), and an output coupler (48). The beam adjuster (42) adjusts the spacing between the plurality of laser beams (20). The transform lens (44A) focuses the laser beams (20) at a focal plane (54) and the beam combiner (46) is positioned at the focal plane (54). The beam combiner (46) combines the lasers beams (20) to provide a combination beam (58). Further, the output coupler (48) redirects at least a portion of the combination beam (58) back to the beam combiner (46) as a redirected beam (60), and transmits a portion of the combination beam (58) as the assembly output beam (12).
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: February 11, 2020
    Inventors: Alexander Jason Whitmore, Michael Pushkarsky, David P. Caffey
  • Patent number: 10511136
    Abstract: The invention relates to a light module including a semiconductor laser element emitting a laser beam in a first cone of light, a photoluminescent element, and an optical means for transforming the light coming from the photoluminescent element into an exit light beam. The optical means has a guiding portion arranged to guide at least a portion of the light emitted in the first cone of light into a second cone of light and a device for detection of incident light. The light module comprises a means of deviation designed to deviate the light of the second cone of light toward a third cone of light directed toward the detection device arranged outside of the second cone of light.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: December 17, 2019
    Assignee: VALEO VISION
    Inventor: Pierre Renaud
  • Patent number: 10501003
    Abstract: A novel semiconductor device is provided. The semiconductor device includes a first resistor and a second resistor. The first resistor and the second resistor are electrically connected in series. A resistance material of the first resistor includes a metal oxide, and a resistance material of the second resistor is different from the resistance material of the first resistor. The semiconductor device is configured to output a voltage corresponding to the resistance values of the first resistor and the second resistor. The voltage reflects the properties of the resistance materials of the first resistor and the second resistor. The semiconductor device may include a circuit for processing this voltage. In that case, the first resistor can be stacked over the circuit, resulting in the downsizing of the semiconductor device.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: December 10, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hajime Kimura, Shunpei Yamazaki
  • Patent number: 10505341
    Abstract: The present disclosure is directed to an optical device including at least one temperature-dependent tunable element for controlling a wavelength of an optical signal, a first sensor configured to indirectly monitor the optical signal, a second sensor configured to directly monitor the optical signal, and a control circuit. The tunable element may be one of (i) a laser for transmitting an outgoing optical signal and (ii) an optical filter coupled to a photodetector for receiving an incoming optical signal. The control circuit may be configured to receive first and second inputs from the first and second sensors, respectively, adjust the tuned wavelength of the tunable element from a first preselected wavelength to a second preselected wavelength based on the first input received from the first sensor, and maintain the tunable element at the second preselected frequency based on the second input received from the second sensor.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: December 10, 2019
    Assignee: Go!Foton Holdings, Inc.
    Inventors: Feng Tian, Chi Kong Paul Ng
  • Patent number: 10491428
    Abstract: A device, including a first current supply configured to provide a bias current to a load and a main current supply having a source terminal coupled in parallel with the load and configured to reduce a current value to the load below the bias current, is provided. The device includes a termination resistor coupled in series with the source terminal of the main current supply and configured to receive current from the source terminal of the main current supply when the source terminal of the main current supply is activated. The device also includes an auxiliary current supply having a sink terminal coupled to the termination resistor at a common node, and configured to maintain the common node at common mode voltage when current flows from the source terminal of the main current supply to the sink terminal of the auxiliary current supply and through the termination resistor.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: November 26, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Clinton Harold Parker, Zhubiao Zhu, Daniel Alan Berkram
  • Patent number: 10416401
    Abstract: In-line uni-directional optical tap detector devices provide optical power monitoring in a small, inexpensive form factor. A pair of optical fibers with angled end surfaces are fusion-spliced or butt-coupled together, with a thin-film coating or coating stack positioned in between the two fiber end surfaces. The thin-film coating or coating stack acts as an optical tap, reflecting a small portion of the optical signal towards a photo-detector affixed to the exterior of the cladding of the fibers, positioned and angled such that the photo-detector measures the optical power of signals propagating in one direction down the fibers, while ignoring signals propagating in the opposite, or reverse direction. Alternately, a V-groove block or fiber holder is used to position and secure the fibers, without requiring fusion splicing, where the reflection of a portion of the optical signal to the photo-detector may be due to Fresnel reflection at the fiber end surfaces.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: September 17, 2019
    Inventor: Ho-Shang Lee
  • Patent number: 10325622
    Abstract: A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: June 18, 2019
    Assignee: Seagate Technology LLC
    Inventors: Karim Tatah, Mourad Benakli, James Gary Wessel
  • Patent number: 10326523
    Abstract: Embodiments include techniques for device analysis and failure prediction, the techniques include measuring or collecting parametric data of the device at a configurable interval, wherein the parametric data includes one or more parameters, and receiving operating limits for the parametric data based on specifications or characteristics for the device. The techniques also include determining a trend of the measured or collected parametric data of the device, and filtering noise from the trend based at least in part on at least one of other devices exhibiting a deviation exhibited by the device or system state changes associated with system log files. The techniques include identifying a failure stage of the device based on at least one of the trend or the received operating limits, and transmitting a notification of a predicted failure based at least in part on the identification.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: June 18, 2019
    Inventors: Daniel M. Kuchta, Philip A. Sciuto
  • Patent number: 10257029
    Abstract: A method of setting up a local broadband network contemplates using electronic circuitry to determine a geographic location of the electronic circuitry. The electronic circuitry can measure an actual condition of the local broadband network at the location and select an external function in the local broadband network dependent on the location and the actual condition. The method further contemplates electronic circuitry signaling at least the location and the external function to a central database via a common communication backbone. The electronic circuitry determines whether the local broadband network exceeds a network load threshold value, wherein falling below the network load threshold value causes the electronic circuitry to re-evaluate one or more connections in the local broadband network. The method contemplates that the electronic circuitry complies with a communication protocol of the local broadband network dependent on the external function.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: April 9, 2019
    Inventor: Andreas Strasser
  • Patent number: 10128654
    Abstract: A light-emitting diode (“LED”) lighting unit includes an operational, a sense resistor electrically connected to the input of the operational amplifier, a first field effect transistor (“FET”) whose gate is electrically connected to the output such that the input voltage at the gate of the first FET rises and falls with the output voltage, a second FET whose gate is electrically connected to the output such that the input voltage at the gate of the second FET rises and falls with the output voltage, and a string of LED lights connected such that when the voltage across the string drops below a level to operate, the voltage across a sense resistor drops, causing the operational amplifier to increase its output until the input voltage at the gate of the second FET increases allowing one bank of LED lights to operate.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: November 13, 2018
    Assignee: B/E Aerospace, Inc.
    Inventors: Eric Johannessen, Brendan Upton, Luis Sam
  • Patent number: 10069278
    Abstract: A laser drive circuit compensates for laser diode dynamics. A compensation value is determined from a sum of weighted basis functions. The basis functions may be a function of current desired optical powers and/or past desired optical powers. The weights may be updated periodically based at least in part on accumulated basis function outputs and measured optical powers.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: September 4, 2018
    Assignee: Microvision, Inc.
    Inventor: Patrick J. McVittie
  • Patent number: 10033153
    Abstract: A fiber optic voltage conditioner, and method therefor, generally relate to voltage conditioning. In such a fiber optic voltage conditioner, there is a laser, and an optical circulator is coupled to receive a light signal from the laser. A controller is coupled to the laser and is configured to generate first control information for wavelength-drift control of the laser. A data acquisition module is coupled to the controller and is configured to generate second control information for the controller for adjustment of the first control information. A photodetector is coupled to the optical circulator to receive a returned optical signal and is coupled to the data acquisition module to provide an analog output signal thereto. The photodetector is configured to generate the analog output signal responsive to the returned optical signal. The data acquisition module is configured to generate the second control information using the analog output signal.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: July 24, 2018
    Assignee: iSenseCloud, Inc.
    Inventors: An-Dien Nguyen, An H Nguyen
  • Patent number: 10003404
    Abstract: Components, systems, and methods for determining efficiency of an optical signal source in distributed communication systems are disclosed. Environmentally induced variations in the performance of optical sources used to convert electrical signals to optical signals (such as laser diodes) at the transmitters within the system can be evaluated in real time. Steps can be taken to compensate for these variations. The efficiency of the laser diode can be measured and provided to receivers in the distributed communication system. The receiver may use information related to the slope efficiency measurement to adjust the gain of the receiving amplifiers to provide desired adjustments to the gain. Thus, the receivers in the remote units (RU) receive information about the slope efficiency of the laser diodes at the head end equipment (HEE) and the HEE receives information about the slope efficiency of the laser diodes at the RU.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: June 19, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: Ofer Nisan, Rami Reuven, Pinhas Yehuda Rosenfelder, Ofer Shinaar
  • Patent number: 9967941
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: May 8, 2018
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Patent number: 9940965
    Abstract: A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: April 10, 2018
    Inventors: Karim Tatah, Mourad Benakli, James Gary Wessel
  • Patent number: 9887180
    Abstract: A method for producing a plurality of semiconductor components and a semiconductor component are disclosed. In an embodiment the method includes applying a semiconductor layer sequence on a substrate, structuring the semiconductor layer sequence by forming trenches thereby separating the semiconductor layer sequence into a plurality of semiconductor bodies and applying an insulating layer covering the trenches and vertical surfaces of the plurality of semiconductor bodies. The method further includes forming a plurality of tethers by structuring the insulating layer in regions covering the trenches, locally detaching the substrate from the plurality of semiconductor bodies, wherein the tethers remain attached to the substrate and selectively picking up each semiconductor body by separating the tethers from the substrate, wherein each semiconductor body comprises a portion of the semiconductor layer sequence.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: February 6, 2018
    Assignees: OSRAM Opto Semiconductors GmbH, X-Celeprint Limited
    Inventors: Matthew Meitl, Christopher Bower, Tansen Varghese
  • Patent number: 9853735
    Abstract: An apparatus includes: a laser driver configured to output a laser diode current in accordance with a transmit data, a bias control code, and a modulation control code, a laser diode configured to receive the laser diode current and output a light signal, a photodiode configured to receive the light signal and output a photodiode current, a reference driver configured to output a reference current in accordance with the transmit data, the transmit enable signal, a reference bias code, and a reference modulation code, a two-fold comparison circuit configured to compare the photodiode current and the reference current and output a first decision and a second decision, and a DSP configured to adjust the bias control code and the modulation control code in accordance with the first decision and a second decision. A method provides reliable light output using the described apparatus.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: December 26, 2017
    Inventors: Chia-Liang (Leon) Lin, Chi-Kung Kuan
  • Patent number: 9819141
    Abstract: Examples of robust self-starting passively mode locked fiber oscillators are described. In certain implementations, the oscillators are configured as Fabry-Perot cavities containing an optical loop mirror on one cavity end and a bulk mirror or saturable absorber on the other end. The loop mirror can be further configured with an adjustable line phase delay to optimize modelocking. All intra-cavity fiber(s) can be polarization maintaining. Dispersion compensation components such as, e.g., dispersion compensation fibers, bulk diffraction gratings or fiber Bragg gratings may be included. The oscillators may include a bandpass filter to obtain high pulse energies when operating in the similariton regime. The oscillator output can be amplified and used whenever high power short pulses are required. For example the oscillators can be configured as frequency comb sources or supercontinuum sources. In conjunction with repetition rate modulation, applications include dual scanning delay lines and trace gas detection.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: November 14, 2017
    Assignee: IMRA America, Inc.
    Inventor: Martin E. Fermann
  • Patent number: 9793316
    Abstract: An imager module having an interposer chip electrically connected to and routing signals between an image sensor, a printed circuit board (PCB), and a voice coil motor (VCM) is disclosed. In some example embodiments, one or more surface mount devices (SMDs) may further be attached to the interposer chip, the PCB, or both the interposer chip and the PCB. The interposer chip may further have a cavity therethrough to allow light to impinge in the image sensor. The interposer chip may still further have through silicon vias (TSVs) to route signals from the PCB to the VCM.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: October 17, 2017
    Assignee: Amazon Technologies, Inc.
    Inventor: Samuel Waising Tam
  • Patent number: 9620928
    Abstract: A laser system comprises: a seed oscillator, having a seed output; dispersive optics, operative to receive the seed output and divide the seed output into spectrally separate seed components; an array of individually addressable, phase adjustable laser amplifiers corresponding to the spectrally separate components, each laser amplifier receiving as its seed one of the spectrally separate seed components and producing one of the spectrally separate amplified components; and phase actuators controlling the individually addressable, phase adjustable laser amplifiers. A method of operating a laser system comprises: generating a seed signal; dividing the seed signal into spectrally separate component signals; amplifying the spectrally separate component signals; recombining the spectrally separate component signals into an amplified output; and controlling phases of the amplified spectrally separate component signals. Both single-pass and double-pass amplifier array versions are disclosed.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: April 11, 2017
    Inventors: Bien Chann, Daniel J. Ripin, Tso Yee Fan, Antonio Sanchez-Rubio
  • Patent number: 9488569
    Abstract: Methods and systems for determining material composition of a test sample may be provided. The test sample may be placed in a magnetic region having a magnetic field. A light beam may be directed at the test sample in the magnetic region. A birefringence in the light beam that has passed through the test sample may be detected. The material composition of the test sample may be determined based on the detected birefringence in the light beam.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: November 8, 2016
    Assignee: Florida Agricultural and Mechanical University
    Inventor: Carol Y. Scarlett
  • Patent number: 9479255
    Abstract: An optical network terminal is provided for use in a passive optical network (PON). The optical network terminal includes a data port for receiving data packets from an external device and a processor for converting the data packets to data link frames. In addition, the optical network terminal includes a memory configured to store a time division multiplexing scheme identifying a time slot assigned to each of a plurality of network nodes in the PON for transmission of upstream optical signals. An optical transceiver is provided for converting the data link frames to upstream optical signals and transmitting the optical signals on an upstream TDMA (time division, multiple access) channel to an Optical Line Terminal (OLT). The optical transceiver includes a burst mode laser diode for generating the optical signals and a burst mode laser driver for biasing the laser diode with a bias signal and a modulation bias signal. The laser driver includes a dual closed loop feedback control circuit.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: October 25, 2016
    Assignee: ARRIS Enterprises, Inc.
    Inventors: David B. Bowler, James M. Aufiero, Francis J. Calabresi, Christopher J. Pekalsky
  • Patent number: 9391718
    Abstract: Methods, architectures, circuits, and/or systems for monitoring operating parameters and/or generating status indications associated with electronic device operation are disclosed. The method can include (i) monitoring a first operating parameter related to operation of the electronic device to determine a first parameter value, (ii) calculating a difference between the first parameter value and a predetermined value for the first operating parameter, (iii) monitoring a second operating parameter on which thresholds for operational warnings and/or alarms are based to determine a second parameter value, (iv) updating or changing the thresholds based on a predetermined change or event in the second parameter value, (v) comparing the difference to the updated or changed thresholds, and (vi) generating a corresponding one of the operational warnings and/or alarms when the difference crosses at least one of the thresholds in a predetermined direction.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: July 12, 2016
    Assignee: Source Photonics, Inc.
    Inventors: Todd Rope, Mark Heimbuch
  • Patent number: 9300108
    Abstract: A high power pump ultra bright low-noise source is configured with a multimode (“MM”) seed source outputting a MM smooth, low-noise signal light at a desired wavelength in a wavelength range between about 974 and 1030 nm, a MM Yb fiber wavelength converter operative to convert emission of a plurality of high power (“HP”) semiconductor laser diodes at a sub-pump wavelength ?sp to a pump output at the desired wavelength ??, wherein ??=????sp<0/1?sp. The Yb-doped MM wavelength converter is configured with noise levels substantially identical to those of the low-noise signal light, brightness (“B”) substantially equal to ?×B, wherein n is a number HP semiconductor laser diodes, and B is brightness of each HP laser diode, and output power (“Po”) substantially equal to nPd, wherein Pd is a power of each HP laser diode, and n is the number thereof.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: March 29, 2016
    Inventors: Valentin Gapontsev, Igor Samartsev
  • Patent number: 9287679
    Abstract: A method of controlling a temperature of a semiconductor laser includes: controlling a supply current so that a temperature of a temperature control element is changed to a target temperature, the temperature control element controlling a temperature of the semiconductor laser by a temperature changing according to the supply current supplied to the temperature control element; and performing a control for maintaining a calculated value calculated by a digital filter at a threshold when it is detected that the calculated value reaches the threshold, the calculated value being the supply current for achieving the target temperature, the threshold being equal to or less than an output limit of the digital filter.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: March 15, 2016
    Inventor: Kenta Kannari
  • Patent number: 9276680
    Abstract: Techniques are described for adaptive sampling qualification for extinction ration control. The techniques may be implemented in a laser driver assembly which includes a laser driver and a sampling loop configured to facilitate sampling of photodiode current produced by a monitor photodiode (MPD) of an optical transmitter assembly. The sampling loop comprises a low pass filter with reset, a digital-to-analog converter (DAC), and a comparator. The filter receives transmit (Tx) data provided to the laser driver and generates an output corresponding to a number of consecutive bits of a first type received in the transmit (Tx) data. The filter resets the output when a bit of a second type is received. The digital-to-analog converter (DAC) outputs a threshold signal. The comparator compares the output from the low pass filter and the threshold signal, and outputs a signal indicating when the photodiode current is to be sampled.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: March 1, 2016
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Miguel Valencia, Benjamin A. Willcocks, Christopher J. Born
  • Patent number: 9147989
    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: December 9, 2013
    Date of Patent: September 29, 2015
    Assignee: IMRA AMERICA, INC.
    Inventors: Lawrence Shah, James M. Bovatsek, Alan Y. Arai, Tadashi Yamamoto, Rajesh S. Patel, Donald J. Harter
  • Patent number: 9083148
    Abstract: The present invention provides, in at least one embodiment, a system and method for power control of lasers. The system includes a device's control signal fed into a laser. The laser can be a master oscillator power amplifier (MOPA) fiber laser. The device includes an equivalent model circuit representing at least one parameter of the laser, such as the gain fiber inversion in the power amplifier. The device measures the power at the equivalent model circuit. Then, the device uses its feedback signal to control and/or adjust the output power control signal fed into the laser based on the measured power. By controlling the power fed into the laser, the laser can be operated at much lower frequencies while keeping the laser power within acceptable limits.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: July 14, 2015
    Assignee: Kongsberg Seatex AS
    Inventors: Martin Ole Berendt, Paulo Tiago Guerreiro
  • Patent number: 9059557
    Abstract: Technologies are generally described for implementing non-linear VCSEL equalization. In some examples, a rising edge tap parameter, a falling edge tap parameter, an equalization delay and a bias current may be used to equalize a data signal to be output from a VCSEL. A VCSEL model may be used to derive a VCSEL response to one or more isolated data pulses. The derived response may then be used to determine the rising and falling edge tap parameters and an equalization delay, based on a bias current value for the VCSEL and a data rate associated with the data signal. The data signal may then be adjusted based on the equalization delay and the rising and falling edge tap parameter and sent to the VCSEL for output. At the same time, the VCSEL may be biased with a bias current having the bias current value.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: June 16, 2015
    Assignee: California Institute of Technology
    Inventors: Mayank Raj, Azita Emami
  • 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: 8937978
    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: Grant
    Filed: May 9, 2012
    Date of Patent: January 20, 2015
    Assignee: University of Surrey
    Inventor: Alf Adams
  • Patent number: 8937977
    Abstract: A laser anti-reflection device includes a polarizing beam splitter, a ?/4 wave plate and an absorber disposed in an outgoing light path of a laser emitting linearly polarized light with a wavelength of ?. The linearly polarized light from the laser passes through the polarizing beam splitter and the ?/4 wave plate in turn to become a circularly polarized light beam. Part of the circularly polarized light beam is then reflected by a workpiece to be processed along the original light path and passes the ?/4 wave plate to become a linearly polarized light beam with a polarization direction vertical to that of the outgoing linearly polarized light beam. The vertical polarized beam passes the polarizing beam splitter, deviates from the light path of the outgoing linearly polarized light beam and reaches the absorber. The laser anti-reflection device prevents reflected light from damaging the laser from high power lasers.
    Type: Grant
    Filed: November 26, 2011
    Date of Patent: January 20, 2015
    Assignee: Beijing Luhe Feihong Laser S&T Co., Ltd.
    Inventors: Zhiyong Wang, Wenbin Qin, Yinhua Cao, Jingjing Dai, Tingwu Ge
  • Patent number: 8923351
    Abstract: In the field of the production of very high frequencies, for example from 1 gigahertz to several terahertz, by beating the frequencies of two laser beams together, a device includes a resonant optical cavity having very stable dimensions receiving the beams, with for each beam, an interrogation device of the resonant cavity supplying an electrical signal representing the difference in frequency between the light frequency of the beam and a resonance frequency of the resonant cavity. The frequency of each beam is servo controlled to minimize the frequency difference observed. The laser beams are produced by a dual-frequency laser producing two beams of different frequencies and orthogonal polarizations. A polarization separator is used for separate servo control of the beams according to polarization, and a polarizer is placed behind a main output of the resonant cavity producing an electromagnetic beam mixing the two polarizations and amplitude-modulated at the beat frequency.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: December 30, 2014
    Assignee: Centre National de la Recherche Scientifique
    Inventors: François Bondu, Marc Brunel, Mehdi Alouini, Marc Vallet, Goulc'hen Loas, Marco Romanelli
  • Patent number: 8902940
    Abstract: The present invention relates to a light source control method capable of decreasing the dependence of a pulse width (FWHM) of an output pulsed light on a repetition frequency. A pulsed light source has an MOPA structure, and has a seed light source and an optical fiber amplifier. The seed light source includes a semiconductor laser which is directly modulated and outputs a pulsed light. By adjusting a temperature of the seed light source and a pumping light power of the optical fiber amplifier, a predetermined full width half maximum of a pulse at a predetermined repetition frequency is implemented for the pulsed light outputted from the optical fiber amplifier.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: December 2, 2014
    Assignee: Megaopto Co., Ltd.
    Inventors: Motoki Kakui, Shinobu Tamaoki
  • 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: 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: 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: 8767783
    Abstract: A light source device is provided with a coherent light source for emitting the coherent light, and a pattern changer for changing an interference pattern of the coherent light on a surface of the illumination object. The pattern changer includes a photorefractive crystal which is arranged between the coherent light source and the illumination object and on an optical path of the coherent light and exhibits a photorefractive effect, and a changer for changing at least one of a light intensity distribution, a polarization direction, a wavelength and an intensity of coherent light incident on the photorefractive crystal. The illumination object is illuminated with the coherent light.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: July 1, 2014
    Assignee: Panasonic Corporation
    Inventors: Koichi Kusukame, Tetsuro Mizushima, Kazuhisa Yamamoto, Hiroyuki Furuya, Shinichi Kadowaki, Kiminori Mizuuchi
  • Patent number: 8743920
    Abstract: There is provided a wavelength variable light source system capable of changing wavelength and intensity of output signal light and of improving preset accuracy and stability of the wavelength and strength of the output signal light. The system determines the both or either one of a target value for controlling wavelength and a target value for controlling intensity of output signal light of a wavelength variable light source by correlating a combination of the target wavelength and the target light output intensity specified from a higher-level device and controls operation states of the wavelength variable light source so that output values of monitoring circuits for monitoring the operation state of the wavelength variable light source converge to the target values.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 3, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Hiroyuki Koshi, Koji Horikawa
  • Patent number: 8718103
    Abstract: The present invention relates to an apparatus for generating an ultra-short ultra-high intensity pulse laser, comprising: a pulse laser providing unit which generates an ultra-short ultra-high intensity pulse laser, stretches pulse width, then selects and provides only a pulse laser having a predetermined polarizing angle; a polarization characteristic adjusting unit which divides the pulse laser provided by the pulse laser providing unit into S-polarizing component light and P-polarizing component light, varies the phase difference and amplitude difference between the S-polarizing component light and the P-polarizing component light, and combines the two types of light to generate a pulse laser with varied polarization characteristics; and a pulse compression unit which compresses the pulse width of the pulse laser, the polarization characteristics of which are varied by the polarization characteristic adjusting unit, and outputs the pulse laser.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: May 6, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Nam-Soo Myung, Seung-Hwan Kim
  • Patent number: 8693509
    Abstract: Loss modulated silicon evanescent lasers are disclosed. A loss-modulated semiconductor laser device in accordance with one or more embodiments of the present invention comprises a semiconductor-on-insulator (SOI) structure resident on a first substrate, the SOI structure comprising a waveguide in a semiconductor layer of the SOI structure, and a semiconductor structure bonded to the semiconductor layer of the SOI structure, wherein at least one region in the semiconductor layer of the SOI structure controls a photon lifetime in the semiconductor laser device.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: April 8, 2014
    Assignee: The Regents of the University of California
    Inventors: John E. Bowers, Daoxin Dai
  • Publication number: 20130315271
    Abstract: In one embodiment, a system includes a master oscillator for generating a primary laser signal. A plurality of amplifiers amplifies a plurality of secondary laser signals and generates a plurality of amplified laser signals. A plurality of actuators adjusts a position, a beam angle, a path length, and a phase of the plurality of amplified laser signals. At least one control module controls the plurality of actuators that adjust the position, the beam angle, the path length, and the phase of the plurality of amplified laser signals. A combiner receives the amplified laser signals to generate a combined laser output signal. At least one filter samples the combined laser output signal to generate a plurality of phase errors as feedback for the control module to control at least one of the position, the beam angle, or the path length for the plurality of amplified laser signals.
    Type: Application
    Filed: May 24, 2012
    Publication date: November 28, 2013
    Inventor: Gregory D. Goodno
  • Patent number: 8571823
    Abstract: A system and a method for controlling the quality of an industrial process, of the type that comprises the steps of: providing one or more reference signals for the industrial process; acquiring one or more real signals that are indicative of the quality of said industrial process; and comparing said one or more reference signals with said one or more real signals in order to identify defects in said industrial process.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: October 29, 2013
    Assignee: CRF Societa Consortile per Azioni
    Inventors: Giuseppe D'Angelo, Giorgio Pasquettaz, Andrea Terreno
  • Patent number: 8548336
    Abstract: Systems and methods are provided for an optical modulation feedback circuit. The feedback circuit includes a low frequency comparison circuit configured to receive a monitoring signal generated by an optical detector, the monitoring signal being proportional to an amount of light generated by an optical transmission device that transmits based on a data signal that is received by an optical driver. The comparison circuit is further configured to generate a modulation control feedback signal that is transmitted to the optical driver based on a comparison of a low frequency component of the monitoring signal and a low frequency component of the data signal.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: October 1, 2013
    Assignee: Semtech Corporation
    Inventor: Jonah Nuttgens
  • Patent number: 8520306
    Abstract: Apparatus for combining laser radiation (1) 5 which apparatus comprises a seed laser (2), a splitter (3), a plurality of amplifier chains (4), a reference amplifier chain (7), detection means (5). demodulator means (6), and phase control means (12), wherein each of the amplifier chains (4) comprises at least one optical amplifier (11), optical radiation (17) emitted from the seed laser (2) is split into the plurality of amplifier chains (4) by the splitter (3).
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: August 27, 2013
    Assignee: SPI Lasers UK Ltd
    Inventors: Malcolm Paul Varnham, Mikhail Nickolaos Zervas, Fabio Ghiringhelli, Andrew Thomas Harker
  • Patent number: 8520709
    Abstract: A laser apparatus includes an external cavity laser (ECL) where the optical signal is modulated by an electrical modulation signal for modulating in frequency the laser output signal. The modulation in frequency produces a modulation of intensity (power) of the laser output signal, also denoted amplitude modulation (AM). A method of controlling the AM amplitude of a signal emitted by an ECL includes a gain medium, a phase element with variable transmissivity induced by the modulation, and a spectrally selective optical filter that selects and keeps the AM amplitude below a certain desired value or minimizes such value. A control method and a laser apparatus are also described in which the reduction of the AM component of the output power is achieved by acting on the gain of the gain medium of the ECL.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: August 27, 2013
    Assignee: Google Inc.
    Inventors: Paolo Baroni, Marco De Donno, Anna Ronchi
  • Patent number: 8442090
    Abstract: A method and apparatus recycle residual energy in an optical parametric burst source.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: May 14, 2013
    Assignee: Lockheed Martin Corporation
    Inventors: G. Paul Perryman, James Richard Wood, Mark K. Browder, Edward Miesak
  • Patent number: 8401046
    Abstract: A multibeam coherent laser diode source comprises a master laser, a linear amplifier and two perpendicular amplifiers. The master laser and amplifiers are in the form of a single heterostructure containing an active layer, two limiting layers and a radiation influx area with an influx layer. The heterostructure is characterized by the ratio of the refractive index of the heterostructure to the refractive index of influx layer. This ratio is determined from a range extending from one plus delta to one minus gamma, where delta and gamma are defined by a number much less than one and gamma is greater than delta. The linear amplifier is positioned so that optical axis of radiation propagation from master laser coincides with the axis of the linear amplifier. Each perpendicular amplifier has output edge and is positioned so that its optical axis is situated at right angle to the axis of linear amplifier.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: March 19, 2013
    Assignee: General Nano Optics Limited
    Inventors: Vasiliy Ivanovich Shveykin, Viktor Archilovich Gelovani, Aleksey Nikolaevich Sonk
  • Publication number: 20130064257
    Abstract: The pulse light source comprises a seed light source, a first YbDF, a band-pass filter, a second YbDF, and a third YbDF, and has the MOPA structure. The band-pass filter inputs pulse light which is outputted from the seed light source and amplified by the first stage YbDF, and outputs, while separating a wavelength band of the inputted pulse light into a shorter wavelength side and a longer wavelength side with reference to a peak wavelength of the inputted pulse light, the attenuated pulse light after attenuating the optical power on one side more than the optical power on the other side between the shorter and longer wavelength sides.
    Type: Application
    Filed: September 5, 2012
    Publication date: March 14, 2013
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventor: Motoki Kakui
  • Publication number: 20130051412
    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: Application
    Filed: February 8, 2012
    Publication date: February 28, 2013
    Applicant: GIGAPHOTON INC
    Inventors: Kenichi Miyao, Motoki Niwano, Osamu Wakabayashi