Frequency Patents (Class 372/32)
  • Patent number: 11916350
    Abstract: A multi-quantum-reference (MQR) laser frequency stabilization system includes a laser system, an MQR system, and a controller. The laser system provides an output beam with an output frequency, and plural feedback beams with respective feedback frequencies. The feedback beams are directed to the MQR system which includes plural references, each including a respective population of quantum particles, e.g., rubidium 87 atoms, with respective resonant frequencies for respective quantum transitions. The degree to which the feedback frequencies match or deviate from the resonance frequencies can be tracked using fluorescence or other electro-magnetic radiation output from the references. The controller can stabilize the laser system output frequency based on plural reference outputs to achieve both short-term and long-term stability, e.g., in the context of an atomic clock.
    Type: Grant
    Filed: April 20, 2023
    Date of Patent: February 27, 2024
    Assignee: ColdQuanta, Inc.
    Inventors: Judith Olson, Gabriel Ycas
  • Patent number: 11893170
    Abstract: A method of positioning a laser pointer light source and a display device are provided. The method of positioning the laser pointer light source includes obtaining first position information and second position information of the laser pointer light source, obtaining first photosensitive information and second photosensitive information, and determining target position information. The present invention determines the target position information according to the first position information, the second position information, the first photosensitive information, and/or the second photosensitive information, which positions the laser pointer light source and distinquishes the laser pointer light source at different positions.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: February 6, 2024
    Inventors: Yang Rao, Leli Peng
  • Patent number: 11769984
    Abstract: A laser module includes: a laser diode bar including a plurality of emitters configured to emit laser light from a front surface and leak light from a rear surface; a housing including a reflecting surface configured to surround a space together with the laser diode bar and reflect, toward the space, light leaked from the rear surface, in a scattering manner; and a detector configured to detect light reflected by the reflecting surface. A laser module includes: a laser diode bar including a plurality of emitters configured to emit laser light from a front surface and leak light from a rear surface; a condenser lens on which light leaked from rear surfaces of all of the plurality of emitters impinges; and a detector configured to detect light transmitted through the condenser lens.
    Type: Grant
    Filed: July 22, 2022
    Date of Patent: September 26, 2023
    Inventor: Hiroshi Ohno
  • Patent number: 11750357
    Abstract: Coherent phase recovery method includes producing, with a transmit-side frequency-comb source, a first frequency-comb signal that includes a pilot tone and a first optical tone having a first center wavelength that differs from a pilot center wavelength of the pilot tone. The method also includes coherently modulating the first optical tone to yield a first modulated signal; and generating a second frequency-comb signal with a receive-side frequency-comb source driven by the pilot tone. The method also includes extracting, from the second frequency-comb signal, a first local-oscillator tone having the first center wavelength; and demodulating the first modulated signal by homodyning the first modulated signal with the first local-oscillator tone.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: September 5, 2023
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Haipeng Zhang, Luis Alberto Campos, Junwen Zhang, Mu Xu, Zhensheng Jia
  • Patent number: 11744003
    Abstract: Disclosed is a device for interaction between a laser beam and a hyperfine energy transition of a chemical species. The device further includes an electro-optic modulator with a single sideband with an input optical waveguide suitable for receiving a source laser beam and an output optical waveguide suitable for generating an output laser beam and an electronic system suitable for generating and applying, simultaneously, a first modulated electrical signal, sin(?1t)) to a first hyperfrequency pulse on a first high-frequency electrode of the electro-optic modulator and, respectively, another modulated electrical signal, cos(?1t)) to the first pulse on another high-frequency electrode of the electro-optic modulator, in such a way as to frequency-switch the output laser beam to a first optical frequency offset from the first pulse with respect to the initial optical frequency.
    Type: Grant
    Filed: November 22, 2018
    Date of Patent: August 29, 2023
    Inventors: Henri Porte, Baptiste Battelier
  • Patent number: 11733094
    Abstract: A two-layer hybrid solid wedged etalon was fabricated and combined with a traditional imager to make a compact computational spectrometer. The hybrid wedge was made of Nb2O5 and Infrasil 302 and was designed to operate from 0.4-2.4 ?m. Initial demonstrations used a CMOS imager and operated from 0.4-0.9 ?m with spectral resolutions <30 cm?1 from single snapshots. The computational spectrometer operates similarly to a spatial Fourier Transform infrared (FTIR) spectrometer with spectral reconstruction using a non-negative least squares fitting algorithm based on analytically computed wavelength response vectors determined from extracted physical thicknesses across the entire two-dimensional wedge. This computational technique resulted in performance and spectral resolutions exceeding those that could be achieved from Fourier techniques. With an additional imaging lenses and translational scanning, the system can be converted into a hyperspectral imager.
    Type: Grant
    Filed: December 9, 2021
    Date of Patent: August 22, 2023
    Assignee: Massachusetts Institute of Technology
    Inventors: Shawn Redmond, Patrick Hassett, Salvatore Di Cecca
  • Patent number: 11716089
    Abstract: A biasing scheme for a voltage-to-time converter (VTC). An example biasing circuit generally includes a reference current source; a feedback loop current source; an amplifier having a first input coupled to a target voltage node, having a second input, and having an output coupled to a control input of the reference current source and to a control input of the feedback loop current source; a first capacitive element; a first switch coupled in parallel with the first capacitive element; a second switch coupled between the feedback loop current source and the first capacitive element; and a third switch coupled between the first capacitive element and the second input of the amplifier.
    Type: Grant
    Filed: March 16, 2022
    Date of Patent: August 1, 2023
    Assignee: XILINX, INC.
    Inventors: Bob W. Verbruggen, Christophe Erdmann
  • Patent number: 11710061
    Abstract: The disclosure describes various aspects of optical control of atomic quantum bits (qubits) for phase control operations. More specifically, the disclosure describes methods for coherently controlling quantum phases on atomic qubits mediated by optical control fields, applying to quantum logic gates, and generalized interactions between qubits. Various attributes and settings of optical/qubit interactions (e.g., atomic energy structure, laser beam geometry, polarization, spectrum, phase, background magnetic field) are identified for imprinting and storing phase in qubits. The disclosure further describes how these control attributes are best matched in order to control and stabilize qubit interactions and allow extended phase-stable quantum gate sequences.
    Type: Grant
    Filed: May 6, 2021
    Date of Patent: July 25, 2023
    Inventors: Christopher Monroe, Marko Cetina, Norbert Linke, Shantanu Debnath
  • Patent number: 11629997
    Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
    Type: Grant
    Filed: November 4, 2021
    Date of Patent: April 18, 2023
    Assignee: IRsweep AG
    Inventors: Stéphane Schilt, Pierre Brochard, Kenichi Komagata, Giulio Terrasanta, Andreas Hugi
  • Patent number: 11489847
    Abstract: A method for detecting, in a real-time manner, a presence or an absence of a an anomaly in or a cyber attack onto a medical apparatus comprises the steps of capturing, with an antenna, one or more emissions of electromagnetic energy from the processing devices within medical apparatus; converting, with a receiver coupled to the antenna, the one or more emissions from an analog to a digital form; generating, with a controller, a digital signal in a time domain; converting, the digital signal from the time domain to a frequency domain, the digital signal containing a signature of cross modulation products from the non-linear attachments; processing, in the frequency domain, the signature of cross modulation products to determine mixing characteristics of the cross modulation products; and detecting, based on the mixing characteristics, the absence or the presence of the anomaly or the cyber attack.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: November 1, 2022
    Inventors: James Robert Uplinger, II, Walter J. Keller, III, Adam Brant
  • Patent number: 11486945
    Abstract: A device for measuring a scalar magnetic field based on pulsed optical pumping, including: a first laser, a first isolator, a first ?/2 waveplate, a first polarizing beam splitter, a first coupler, a first spectrum analyzer, a reflector, an atomic sensor probe, a second ?/2 waveplate, a second polarizing beam splitter, a first photoelectric converter, a second photoelectric converter, a data acquisition system, a second laser, a second isolator, an acousto-optic modulator, a third ?/2 waveplate, a third polarizing beam splitter, a second fiber coupler, a second spectrum analyzer, a ?/4 waveplate and a beam expander. Two planar reflectors are respectively arranged at two sides of the atomic sensor probe and face towards the atomic sensor probe, and are arranged parallel to the pump beam input to the atomic sensor probe.
    Type: Grant
    Filed: July 5, 2022
    Date of Patent: November 1, 2022
    Assignee: Zhejiang University of Science and Technology
    Inventors: Shuguang Li, Jinsheng Liu, Ming Jin, Kenneth Tetteh Akiti, Eric-Theophilus Tochukwu Nwodom
  • Patent number: 11480665
    Abstract: A stabilized LiDAR system and a method for stabilization. The LiDAR system includes a laser, the laser being designed for emission of monochromatic LiDAR radiation within a wavelength working range; a thermocouple element configured to set the working temperature of the laser; a means for evaluation, designed to determine, from the radiation emitted by the laser, a measure for the deviation from an actual wavelength of the radiation to a setpoint wavelength within the wavelength working range of the laser; and a means for regulation, designed to control the thermocouple element on the basis of the measure of deviation determined by the means for evaluation, in such a way that the working temperature of the laser is set to a value, at which the emitted monochromatic LiDAR radiation corresponds to the setpoint radiation.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: October 25, 2022
    Assignee: Robert Bosch GmbH
    Inventors: Mirko Hattass, Timo Knecht
  • Patent number: 11476942
    Abstract: A coherent fiber bundle may be used to optically connect an array of microLEDs to an array of photodetectors in an optical communication system.
    Type: Grant
    Filed: June 1, 2021
    Date of Patent: October 18, 2022
    Inventors: Robert Kalman, Bardia Pezeshki, Alexander Tselikov, Cameron Danesh
  • Patent number: 11469568
    Abstract: A laser apparatus includes: (A) a solid-state laser apparatus that outputs burst seed pulsed light containing a plurality of pulses; (B) an excimer amplifier that amplifies the burst seed pulsed light in a discharge space in a single occurrence of discharge and outputs the amplified light as amplified burst pulsed light; (C) an energy sensor that measures the energy of the amplified burst pulsed light; and (D) a laser controller that corrects the timing at which the solid-state laser apparatus is caused to output the burst seed pulsed light based on the relationship of the difference between the timing at which the solid-state laser apparatus outputs the burst seed pulsed light and the timing at which the discharge occurs in the discharge space with a measured value of the energy.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: October 11, 2022
    Assignee: Gigaphoton Inc.
    Inventors: Kouji Kakizaki, Osamu Wakabayashi
  • Patent number: 11462885
    Abstract: A master oscillator power amplifier comprises a semiconductor laser formed on a substrate and configured to output an optical signal, and a semiconductor optical amplifier (SOA) formed on the substrate. The SOA comprises an optical waveguide having an optically active region, wherein the optical waveguide is configured to expand a mode size of the optical signal along at least two dimensions.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: October 4, 2022
    Assignee: Cisco Technology, Inc.
    Inventors: Dominic F. Siriani, Vipulkumar K. Patel
  • Patent number: 11451011
    Abstract: A laser module includes: an optical fiber; a plurality of semiconductor laser devices that includes a first semiconductor laser device and a second semiconductor laser device; a condenser lens that condenses laser beams emitted from the plurality of semiconductor laser devices and optically couples the laser beams to the optical fiber; a first terminal that supplies a first drive current to the first semiconductor laser device; and a second terminal that supplies a second drive current that to the second semiconductor laser device. The second drive current is smaller than the first drive current.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: September 20, 2022
    Assignee: Fujikura Ltd.
    Inventor: Yohei Kasai
  • Patent number: 11441944
    Abstract: Systems and methods for controlling optical feedback in an optical system. A resonant optical cavity includes at least two cavity mirrors, one of which is a cavity coupling mirror, and has a plurality of optical resonance cavity modes. A radiation source emits a beam of continuous wave radiation and is capable of being scanned whereby a mean optical frequency of the continuous wave radiation beam is adjustable over a range of frequencies, wherein the radiation source is responsive to optical feedback radiation emerging from the cavity, and wherein the mode matching optics couples the beam of continuous wave radiation to the cavity via the cavity coupling mirror. The radiation source and the mode matching optics are aligned so that a mode fill ratio is reduced relative to a maximum mode fill ratio, wherein the laser beam is coupled with a fundamental cavity mode.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: September 13, 2022
    Assignee: Li-Cor, Inc.
    Inventor: Ahmed Bouzid
  • Patent number: 11437068
    Abstract: A recording head includes an external cavity laser with an externally mounted part having an active region. The external cavity laser also includes a channel waveguide that delivers light towards a media-facing surface. A near-field transducer functions as a reflector, either alone or in combination with a Bragg grating in the channel waveguide. A reflective back facet of the externally mounted part and the reflector define a resonator of the external cavity laser.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: September 6, 2022
    Assignee: Seagate Technology LLC
    Inventors: Vivek Krishnamurthy, Scott Eugene Olson, Tyler Lenn Perry, John Charles Duda
  • Patent number: 11429010
    Abstract: Systems and methods for a tunable radio frequency synthesizer utilizing optical frequency combs are provided. In one embodiment, an RF signal generator comprises: an SBS pump laser segment including a first and second SBS pump laser each generating SBS laser light at different respective frequencies; a TE/TM dual comb resonator comprising a comb optical resonator coupled to the first and second SBS pump lasers, wherein the comb optical resonator generates a pair of counter-propagating optical frequency combs of different polarities from the SBS laser light; a filter resonator segment configured to provide feedback to the TE/TM dual comb resonator to lock a relative position of the pair of counter-propagating optical frequency combs, the filter resonator comprising a tunable optical filter to output a discrete tuned RF signal output based on a comb line pair that includes a single comb line from each of the pair of counter-propagating optical frequency combs.
    Type: Grant
    Filed: August 25, 2021
    Date of Patent: August 30, 2022
    Assignee: Honeywell International Inc.
    Inventors: Matthew Wade Puckett, Jianfeng Wu, Karl D. Nelson, Chad Hoyt
  • Patent number: 11394460
    Abstract: An optical transmission/reception unit includes a carrier rotatable about a rotational axis, an optical receiver arranged at the carrier on the rotational axis to receive an optical reception signal from a first direction, an optical transmitter arranged adjacent to the optical receiver at the carrier to emit an optical transmission signal in a second direction, and a transmission/reception optic arranged at the carrier on the rotational axis above the optical receiver and extending across the optical receiver and the optical transmitter, wherein the transmission/reception optic includes a reception optic and a transmission optic arranged in the reception optic. The reception optic is configured to guide the optical reception signal incident on the transmission/reception optic towards the optical receiver on the rotational axis, and the transmission optic is arranged above the optical transmitter and is configured to shape the optical transmission signal emitted by the optical transmitter into an output beam.
    Type: Grant
    Filed: October 6, 2020
    Date of Patent: July 19, 2022
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventor: Tobias Schneider
  • Patent number: 11387070
    Abstract: There is described a device for generating electromagnetic field oscillation in a RF device or cavity. The device generally has a photo-diode configured for receiving a laser pulse train and emitting a first electrical signal based thereon, the first electrical signal having a plurality of frequencies; and a harmonics selector configured to output a second electrical signal having one or more frequency of the first electrical signal, the one or more frequency being selected in a manner for the output to generate the electromagnetic field oscillation in the RF device or cavity.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: July 12, 2022
    Inventors: Martin Otto, Bradley Siwick
  • Patent number: 11387908
    Abstract: Provided is an optical transceiver including a reference tunable laser module configured to generate and output light of a reference wavelength; a first general tunable laser module configured to generate and output light of a first wavelength; and a controller configured to control a tuning operation of the first wavelength of the first general tunable laser module, based on information about a relationship between the reference wavelength and the first wavelength.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: July 12, 2022
    Assignee: SOLiD, INC.
    Inventor: Bum Soo Park
  • Patent number: 11374380
    Abstract: Provided is a semiconductor laser including: a core layer having an active layer and a diffraction grating layer optically coupled to the active layer; and paired clad layers arranged sandwiching the core layer, and formed with a waveguide along the core layer, and the semiconductor laser includes: a flat layer provided continuously with the diffraction grating layer along the waveguide; and a temperature control mechanism for controlling the temperature of the flat layer to a temperature different from that of the diffraction grating layer.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: June 28, 2022
    Assignee: HORIBA, Ltd.
    Inventors: Tomoji Terakado, Makoto Matsuhama, Kyoji Shibuya
  • Patent number: 11320587
    Abstract: Aspects of the present disclosure describe planar lightwave circuit systems, methods and structures including a resonant mirror assembly having cascaded resonators that provide or otherwise facilitate the control of the transmissivity/reflectivity of a planar lightwave circuit (PLC)—or portion thereof—over a range of 0% to substantially 100%.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: May 3, 2022
    Assignee: LioniX International BV
    Inventors: Ruud Michiel Oldenbeuving, Chris Gerardus Hermanus Roeloffzen, Roelof Bernardus Timens, Jörn Philipp Epping, Ilka Dove, Dimitri Geskus
  • Patent number: 11305352
    Abstract: Methods, architectures, mechanisms and/or apparatus configured to manufacture a component (and components manufactured thereby) by optimizing a location of an internal feature of the component to be manufactured using powder fusion additive manufacturing (PFAM) based on an energy release rate being proportional to the third derivative of a component shape function and the shape function itself; the internal feature comprising one or more cavities having unfused powder disposed therein to provide vibration dampening.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: April 19, 2022
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Onome Scott-Emuakpor, Tommy George, Brian Runyon
  • Patent number: 11303088
    Abstract: An optical frequency manipulation using an optical subsystem configured to provide a modulated laser beam for interaction with an atomic sample. The optical system may include: an optical subsystem for producing a light beam, the optical subsystem having a laser source and an IQ modulator, wherein the IQ modulator is operable to modulate light from the laser source at a carrier frequency to produce modulated light having a single sideband at a sideband frequency; and a chamber for containing an atomic sample, wherein the optical subsystem is arranged to direct the light beam towards the chamber to interact with an atomic sample contained therein.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: April 12, 2022
    Inventors: Yu-Hung Lien, Michael Holynski, Lingxiao Zhu, Kai Bongs
  • Patent number: 11294256
    Abstract: A method and a system for controlling an optical frequency comb, where the working power of the pump source is dynamically adjusted and controlled, which not only greatly shortens a control time of a stable mode-locking and realizes a fast mode-locking control, but also quickly stabilizes the power control of stable working condition, thereby reducing unnecessary power consumption caused by power reciprocating oscillation tracking controls and better achieving the energy-saving effect of the power adjustment control process. The temperature of the working environment of the pump source is dynamically adjusted and controlled, so that the environment temperature can quickly reach the reference environment temperature required for mode-locking, which not only creates a good temperature condition for the mode-locking of the optical comb system, but also improves the efficiency of environment temperature stability control in the stable working conditions.
    Type: Grant
    Filed: February 7, 2021
    Date of Patent: April 5, 2022
    Assignees: Chongqing Institute of East China Normal University, SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY CO., LTD., East China Normal University
    Inventors: Heping Zeng, Shuang Li, Xuling Shen
  • Patent number: 11281070
    Abstract: A device for high-speed real-time sampling of mid-infrared ultrafast light signals includes a time domain amplification unit and a detection unit. The time domain amplification unit is used to perform sampling and time domain amplification on signal light incident to the time domain amplification unit, and convert the signal light of a mid-infrared band into a near-infrared/visible band. The detection unit is used to receive and record information of the to-be-detected signal light processed by the time domain amplification unit to realize high-speed real-time sampling and measurement of the mid-infrared ultrafast light signal. The present disclosure can accurately obtain subpicosecond transient characteristics of the light signal, breaks through the capacity limit to the response rate of a traditional photoelectric detector, the bandwidth of the oscilloscope and the like, and is applicable to femtosecond-level mid-infrared ultrafast light signals.
    Type: Grant
    Filed: December 2, 2019
    Date of Patent: March 22, 2022
    Assignee: Xi'an Institute of Optics and Precision Mechanics of CAS
    Inventors: Qibing Sun, Leiran Wang, Wenfu Zhang, Aihu Zheng, Chao Zeng, Wei Zhao
  • Patent number: 11264779
    Abstract: The optical module includes: a housing having first and second end walls and a pair of side walls; a semiconductor laser element; a first TEC; a wavelength locker unit including an optical splitting component and an etalon filter; and a second TEC. The second end wall is provided with a feedthrough. The pair of side walls is not provided with an external connection terminal. The second TEC is disposed between the first TEC and the second end wall and has: a first substrate thermally coupled to a bottom surface of the housing; a second substrate thermally coupled to the etalon filter; and a heat transfer part that transfers heat. The optical module further includes a wiring pattern that is arranged side by side with the heat transfer part and that supplies electric power to the first TEC from the feedthrough.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: March 1, 2022
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Taichi Misawa, Tomoya Saeki
  • Patent number: 11237060
    Abstract: The invention relates to an optoelectronic chip comprising the following elements: a light inlet; a wavelength-sensitive optical filter; a first photoelectric element for measuring a first light intensity, particularly a first photodiode, the first photoelectric element being arranged such that light penetrating the optoelectronic chip via the light inlet, transmitted by the filter, hits the first photoelectric element; and a second photoelectric element for measuring a second light intensity, particularly a second photodiode, the second photoelectric element being arranged such that the light penetrating the optoelectronic chip via the light inlet, which is reflected by the filter, hits the second photoelectric element.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: February 1, 2022
    Assignee: FOS4X GMBH
    Inventor: Markus Schmid
  • Patent number: 11231278
    Abstract: An optical system includes at least one laser source configured to generate first light having a first spectrum comprising a plurality of first peaks, a waveform generator configured to produce a noise waveform, and an electro-optic phase modulator in optical communication with the at least one laser source and in electrical communication with the waveform generator. The electro-optic phase modulator is configured to receive the first light, to receive the noise waveform, and to respond to the noise waveform by modulating the first light to produce second light having a second spectrum comprising a plurality of second peaks. The peak wavelengths of the second peaks are equal to the peak wavelengths of the first peaks and the linewidths of the second peaks are broader than the linewidths of the corresponding first peaks.
    Type: Grant
    Filed: October 15, 2020
    Date of Patent: January 25, 2022
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Michel J. F. Digonnet, Jonathan M. Wheeler
  • Patent number: 11231642
    Abstract: A light source module, a projector using the same and a light source control method are disclosed. The light source module includes a laser light source, a temperature sensor, a light source driver and a controller. The temperature sensor is adjacent to the light source and configured to sense a light source temperature of the laser light source. The controller is configured to: (1) determine whether the light source temperature reaches a first temperature value; (2) if yes, control the light source driver to drive the laser light source to illuminate by a first current; (3) determine whether the light source temperature changes from the first temperature value to a second temperature value different from the first temperature value; and, (4) if yes, control the light source driver to drive the laser light source to illuminate by a second current different from the first current.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: January 25, 2022
    Assignee: Qisda Corporation
    Inventors: Chien-Hung Lin, Tzu-Huan Hsu
  • Patent number: 11199754
    Abstract: A demodulator can include an optical resonator. The optical resonator can include a resonant cavity that extends between a first surface that is partially reflective and a second surface that is at least partially reflective. The first surface can receive a phase-modulated optical signal that has a time-varying phase. The resonant cavity can accumulate resonant optical signal energy based at least in part on the phase-modulated optical signal. The first surface can direct a fraction of the resonant optical signal energy out of the optical resonator to form an intensity-modulated optical signal that has a time-varying intensity. A data detector can receive at least a portion of the intensity-modulated optical signal and, in response, generate an intensity-modulated electrical signal that has a time-varying intensity that corresponds to the time-varying phase of the phase-modulated optical signal.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: December 14, 2021
    Assignee: Raytheon Company
    Inventors: Andrew M. Kowalevicz, Benjamin P. Dolgin, Gary M. Graceffo
  • Patent number: 11181374
    Abstract: A resonator fiber optic gyroscope (RFOG) that includes at least one laser, a resonator and a resonator hopping control system is provided. The resonator is in operational communication with the at least one laser to receive a clockwise (CW) laser light and counterclockwise (CCW) laser light produced by the at least one laser. The resonance hopping control system is in communication with an output of the resonator and the at least one laser. The resonance hopping control system is configured to control an output of the at least one laser to periodically unlock, hop and lock frequencies of the laser light traveling in the CW and CCW directions in the resonator to resonance frequencies of the resonator to mitigate bias errors due to resonance asymmetries.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: November 23, 2021
    Assignee: Honeywell International Inc.
    Inventors: Marc Smiciklas, Glen A. Sanders, Lee K. Strandjord
  • Patent number: 11143819
    Abstract: An optical filter assembly comprising: a tuneable optical filter; a beam splitter assembly configured to split an input beam into an output beam, a reference beam, and a probe beam, and to direct the output beam and the probe beam through the tuneable optical filter, such that the probe beam is at an angle ? to the output beam; a first detector configured to measure the intensity S0 of the reference beam; a second detector configured to measure the intensity S1 of the probe beam after it has passed through the filter; a controller configured to adjust the tuneable optical filter on the basis of the measured intensities of the reference and probe beams.
    Type: Grant
    Filed: January 30, 2019
    Date of Patent: October 12, 2021
    Assignee: Lumentum Technology UK Limited
    Inventor: Adrian Perrin Janssen
  • Patent number: 11092426
    Abstract: Optical coherence tomography (OCT) probe and system designs are disclosed that minimize the effects of mechanical movement and strain to the probe to the OCT analysis. It also concerns optical designs that are robust against noise from the OCT laser source. Also integrated OCT system-probes are included that yield compact and robust electro-opto-mechanical systems along with polarization sensitive OCT systems.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: August 17, 2021
    Assignee: Excelitas Technologies Corp.
    Inventors: Bartley C. Johnson, Dale C. Flanders
  • Patent number: 11095095
    Abstract: External cavity diode laser (ECDL) devices and methods for producing the same are described that allows ECDLs to be readily produced and configured to operate at a desired range of wavelengths, while allowing tunability of the output wavelength. One ECDL includes a laser gain chip including a gain medium, a first reflective surface at a first end of the gain medium, and a second surface at a second end of the gain medium opposite to the first reflective surface. The second surface has a facet that forms an angle approximately equal to Brewster's angle for light having a first wavelength. The ECDL further includes a diffraction grating positioned to receive light that passes through the second surface, to operate as a mirror in the external cavity diode laser, and to allow a portion of the light to be directed outside of the external cavity diode laser as output light.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: August 17, 2021
    Inventor: Yushi Kaneda
  • Patent number: 11085831
    Abstract: A high-resolution real-time time-frequency domain measuring device includes a light splitting unit used to split signal light to be measured, a time lens unit used to perform time domain amplification on the signal light to be measured, a dispersion Fourier transform unit used to perform Fourier transform on the signal light to be measured, and a detection unit used to receive and detect measured data. The time lens and the dispersion Fourier transform technology are used to realize the real-time measurement of sub-picosecond transient characteristics of the ultra-short pulse to accurately obtain the time-frequency domain information of the ultra-short pulse.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: August 10, 2021
    Inventors: Qibing Sun, Chao Zeng, Leiran Wang, Wenfu Zhang, Wei Zhao
  • Patent number: 11079323
    Abstract: A method of generating frequency combs composed of a predetermined number of rays, wherein the method includes the modulation of a main ray generated by a laser source (20), by a first radiofrequency signal at a first frequency value, by a second radio frequency signal at a second frequency value, and by a third radio frequency signal at a third frequency value. The second frequency value is equal to twice the first frequency value. The third frequency value is equal to three times the first frequency value.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: August 3, 2021
    Inventors: Philippe Hébert, François Lemaître, Xavier Orlik, Thibault Dartigalongue
  • Patent number: 11050211
    Abstract: A pulsed laser device includes a laser light source, an electro-optic modulator, a laser light source driver, an electro-optic modulator driver, and a controller to control the laser light source driver and the electro-optic modulator driver. The laser light source outputs pulsed laser light pulse-modulated by the laser light source driver. The electro-optic modulator outputs pulsed laser light obtained by causing the electro-optic modulator driver to pulse-modulate the pulsed laser light from the laser light source. The control unit controls the laser light source driver and the electro-optic modulator driver such that the electro-optic modulator turns on at least while the laser light source is on and the electro-optic modulator turns on at least once while the laser light source is off, thereby increasing a duty ratio of the pulse modulation for the electro-optic modulator relative to a duty ratio of the pulse modulation for the laser light source.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: June 29, 2021
    Inventors: Ryo Kawahara, Shunichi Matsushita
  • Patent number: 11043788
    Abstract: The present disclosure provides a dark cavity laser, including: a frequency stabilized laser output device configured to generate a laser light, and perform a frequency stabilized processing on the generated laser light to output it to the dark cavity laser device as a pump light of a gain medium of a dark cavity; and a dark cavity laser device including a main cavity, and a cavity of the main cavity is provided inside with a gas chamber of a gain medium of a dark cavity laser light, where the gain medium of the dark cavity laser light is alkali metal atoms; the dark cavity laser device is configured to receive the pump light, and form a polyatomic coherent stimulated radiation between transition levels of the alkali metal atoms in the gas chamber by a weak feedback of the main cavity to generate the dark cavity laser light.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: June 22, 2021
    Inventors: Jingbiao Chen, Tiantian Shi
  • Patent number: 11018470
    Abstract: A system for producing single-frequency or near-single-frequency operation of a laser beam includes a laser for emitting a laser beam at each one of a plurality of cavity lengths, A detector is configured to receive at least a portion of the laser beam emitted, and generate a signal. A computer system is configured to identify at least one beat note in the signal for each of at least one of the plurality of cavity lengths, the at least one beat note indicating the presence of one or more higher-order transverse modes, longitudinal modes, or both, in the received at least the portion of the laser beam emitted at the at least one of the plurality of cavity lengths. The cavity is adjusted to one of the plurality of cavity lengths for eliminating or minimizing the at least one beat note.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: May 25, 2021
    Assignee: Picomole Inc.
    Inventors: Chris Purves, Jean-François Bisson, Gisia Beydaghyan
  • Patent number: 10980100
    Abstract: A system includes a laser source operable to provide a laser beam, a laser amplifier having a gain medium operable to provide energy to the laser beam when the laser beam passes through the laser amplifier, and a residual gain monitor operable to provide a probe beam and operable to derive a residual gain of the laser amplifier from the probe beam when the probe beam passes through the laser amplifier while being offset from the laser beam in time or in path.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: April 13, 2021
    Inventors: Chun-Lin Louis Chang, Jen-Hao Yeh, Han-Lung Chang, Tzung-Chi Fu, Bo-Tsun Liu, Li-Jui Chen, Po-Chung Cheng
  • Patent number: 10890484
    Abstract: A wavelength measuring device configured to detect a wavelength of ultraviolet laser light outputted from a laser resonator with at least one etalon, the wavelength measuring device includes: a first housing having an interior space being sealed and accommodating the etalon, an input window through which the ultraviolet laser light enters to the first housing, the input window being provided at a first opening of the first housing, a first sealing member configured to seal a gap between a rim part of the input window and a circumferential portion of the first opening, a shielding film provided between the rim part of the input window and the first sealing member and configured to shield the first sealing member from the ultraviolet laser light coming from the input window, and a diffusing element provided outside of the first housing and configured to diffuse the ultraviolet laser light before being incident on the input window.
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: January 12, 2021
    Assignee: Gigaphoton Inc.
    Inventor: Masato Moriya
  • Patent number: 10862272
    Abstract: A gallium- and nitrogen-containing laser device including an etched facet with surface treatment to improve an optical beam is disclosed.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: December 8, 2020
    Assignee: Soraa Laser Diode, Inc.
    Inventors: James W. Raring, Mathew C. Schmidt, Bryan Ellis
  • Patent number: 10756514
    Abstract: An oscillator system includes a laser source; a high-Q electro-optical oscillator to generate a high-Q electro-optical oscillator signals having oscillator frequencies; and an environment-insensitive resonator including ENZ metamaterials. The resonator receives a laser from the laser source and generate a feedback signal to lock the oscillator to reduce a phase/frequency noise in the oscillator. An optical system also includes a high-Q electro-optical oscillator to generate a high-Q electro-optical oscillator signal having oscillator frequencies; an environment insensitive signal delay waveguide having an EMNZ metamaterial such that the signal delay waveguide delays the high-Q electro-optical oscillator signal and generates a delayed signal; and a phase-lock circuit to receive the delayed signal from the signal delay waveguide and provide an electrical feedback signal to the oscillator.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: August 25, 2020
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Weimin Zhou
  • Patent number: 10670786
    Abstract: An electronic device may be provided with a color ambient light sensor. The color ambient light sensor may be used to measure an ambient light spectrum over a wavelength range of interest. Control circuitry in the electronic device can take actions based on the measured ambient light spectrum such as adjusting the brightness and color cast of content on a display. A display may have a display cover layer. The color ambient light sensor can be mounted under the display cover layer and may receive ambient light through the display cover layer. The color ambient light sensor may have a tunable wavelength filter such as an electrically adjustable Fabry-Perot resonator. A light collimator may be interposed between the display cover layer and the Fabry-Perot resonator to collimate ambient light that is passed to the Fabry-Perot resonator. A light detector measures the light passing through the Fabry-Perot resonator.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: June 2, 2020
    Assignee: Apple Inc.
    Inventors: Dong Zheng, Ove Lyngnes, Prashanth S. Holenarsipur, Serhan O. Isikman, Tianbo Sun, Tingjun Xu, Xianwei Zhao, Xingxing Cai
  • Patent number: 10666012
    Abstract: A method and system for obtaining single-frequency operation of a laser system. A laser beam is emitted from a laser cavity, having an adjustable length, at a plurality of cavity lengths. At least a portion of the laser beam is received at a detector, which detects the presence of transverse and/or longitudinal modes in the laser beam, and generates a laser beam signal having a beat-note indicative thereof. The laser beam signal for each of the plurality of cavity lengths can be analyzed, and a cavity length of best mode purity, indicating single-frequency operation, can be selected. The laser beam system can emit a laser and have a laser beam splitter for directing at least a portion of the emitted laser beam to a laser beam detector for generating at least one laser beam signal therefrom, and an actuator for adjusting the length of the laser cavity.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: May 26, 2020
    Assignee: PICOMOLE INC.
    Inventors: Chris Purves, Jean-François Bisson, Gisia Beydaghyan
  • Patent number: 10637581
    Abstract: An optical channel monitor (OCM) may include a modulator to provide a modulation signal and a local oscillator (LO) to provide a modulated LO signal. The modulated LO signal may be created by modulating an LO signal based on the modulation signal. The OCM may include a mixer to generate a pair of mixed optical signals. The pair of mixed optical signals may be generated based on mixing the modulated LO signal and an input optical signal. The OCM may include an optical detector to provide, based on the pair of mixed optical signals, a first electrical signal corresponding to a coherent mixture of the input optical signal and the modulated LO signal. The OCM may include a synchronous demodulator to provide, based on the first electrical signal and the modulation signal, a second electrical signal representative of the optical power spectrum of the input optical signal.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: April 28, 2020
    Assignee: Lumentum Operations LLC
    Inventors: Shane H. Woodside, Jiamin Zheng
  • Patent number: 10574028
    Abstract: The present disclosure provides a unique digitally integrated, self-trained pre-distortion curve generation method and apparatus for semiconductor lasers (SCLs) to generate linearly swept optical signals that are applicable to a wide range of sweep velocities and semiconductor laser types. The method requires no prior knowledge of the frequency response of the laser and is highly accurate.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: February 25, 2020
    Assignee: Rhode Island Council on Postsecondary Education
    Inventors: Tao Wei, Zheyi Yao, Yan Sun