Mode Locking Patents (Class 372/18)
  • Patent number: 11362483
    Abstract: Disclosed is a system for generating a spatially localized, high-intensity laser beam, including: a laser source designed to generate a burst of N laser pulses with a duration of less than or equal to one picosecond, the N laser pulses having a first repetition frequency greater than or equal to 0.5 gigahertz; a resonant optical cavity designed to receive and store the burst of N laser pulses, the resonant optical cavity being designed to focus the burst of N laser pulses in an interaction region of the resonant optical cavity; and a servo control system designed to control the first repetition frequency relative to the roundtrip distance in the resonant optical cavity, such that the N pulses of the burst are superimposed temporally and spatially by constructive interferences in the interaction region so as to form one giant ultra-short and high-energy pulse.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: June 14, 2022
    Assignees: AMPLITUDE, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Fabien Zomer, Pierre Favier, Antoine Courjaud
  • Patent number: 11287457
    Abstract: This invention disclosed a system and method for characteristics measurement of electromagnetic signals. The measurement system comprises a multi-repetition-rate pulsed light source, a frequency mixer for electrical signal and optical signal, and a data acquisition and processing device. The measurement system accurately determines the characteristic information of the signal to be measured, such as frequency, phase, intensity, and their variations, by measuring the low frequency mixed signal generated by the multi-repetition-rate pulsed light source and the signal to be measured in the frequency mixer. This system has the advantages of simple structure, high measurement accuracy, low cost and large measurable frequency range. The system can be applied to the measurement of various electromagnetic signals, covering the spectral range from microwave, millimeter wave, to terahertz and even light wave.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: March 29, 2022
    Assignee: BEIHANG UNIVERSITY
    Inventors: Zheng Zheng, Xin Zhao, Cui Li
  • Patent number: 11276980
    Abstract: A method and apparatus for passively synchronising the repetition rate of two or more mode-locked lasers is described. The method and apparatus involve forming a first synchronising optical field (6) by separating a portion of an output field of a first mode-locked laser (2) and thereafter redirecting this synchronising optical field to form a driving signal for a second mode-locked laser (3). Employing these techniques results in systems with timing jitter of less than 1 fs. The method is independent of the wavelength and polarisation at which the mode-locked lasers operate and so is not limited to use with any particular type of mode-locked laser. Since the technique is passive it does not require the employment of electronics, variable time delay paths or additional non-linear optical crystals. Therefore, the method and apparatus are significantly less complex than those known in the art and are not power limited by additional non-linear optical processes.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: March 15, 2022
    Assignee: M SQUARED LASERS LIMITED
    Inventors: Gareth Thomas Maker, Graeme Peter Alexander Malcolm, Lukasz Kornaszewski
  • Patent number: 11251783
    Abstract: An apparatus includes a phase modulator configured to modulate a phase of an incoming frequency-modulated signal based on a clock signal to generate a phase-modulated signal, where the clock signal is associated with a clock frequency. The apparatus also includes an etalon configured to receive the phase-modulated signal and generate an output signal based on the phase-modulated signal. The apparatus further includes a detector configured to identify amplitudes associated with a first harmonic of the clock frequency and a first subharmonic of the clock frequency in the output signal. In addition, the apparatus includes a decoder configured to recover information encoded in the incoming frequency-modulated signal based on instantaneous frequency deviations of the incoming frequency-modulated signal, where the instantaneous frequency deviations are identified based on relative amplitudes of the first harmonic and the first subharmonic.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: February 15, 2022
    Assignee: Raytheon Company
    Inventors: Benjamin P. Dolgin, Andrew M. Kowalevicz, Gary M. Graceffo
  • Patent number: 11198251
    Abstract: An apparatus (1) for additive manufacturing of three-dimensional objects (2) by successive, selective layer-by-layer exposure and thus solidification of construction material layers of a construction material (3) that can be solidified by means of an energy beam, comprising at least one temperature control device (11), which is provided for at least partial temperature control of a construction material layer formed in a construction plane, wherein the temperature control device (11) comprises at least one temperature control element (12), which is provided for generating an, especially electromagnetic, temperature control beam, wherein the at least one temperature control element (12) is formed as or comprises a temperature control diode.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: December 14, 2021
    Assignee: CONCEPT LASER GMBH
    Inventors: Frank Herzog, Florian Bechmann, Peter Pontiller-Schymura
  • Patent number: 11177622
    Abstract: A low-repetition-rate (10-Hz), picosecond (ps) optical parametric generator (OPG) system produces higher energy output levels in a more robust and reliable system than previously available. A picosecond OPG stage is seeded at an idler wavelength with a high-power diode laser and its output at ˜566 nm is amplified in a pulsed dye amplifier (PDA) stage having two dye cells, resulting in signal enhancement by more than three orders of magnitude. The nearly transform-limited beam at ˜566 nm has a pulse width of ˜170 ps with an overall output of ˜2.3 mJ/pulse. A spatial filter between the OPG and PDA stages and a pinhole between the two dye cells improve high output beam quality and enhances coarse and fine wavelength tuning capability.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: November 16, 2021
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: James R. Gord, Paul S Hsu, Sukesh Roy
  • Patent number: 11152757
    Abstract: A fiber laser producing a beam of ultrashort laser pulses at a repetition rate greater than 200 MHz includes a linear fiber resonator and a fiber branch. Ultrashort laser pulses are generated by passive mode-locking and circulate within the linear fiber resonator. Each circulating laser pulse is split into a portion that continues propagating in the linear fiber resonator and a complementary portion that propagates through the fiber branch and is then returned to the linear fiber resonator. The optical length of the linear fiber resonator is an integer multiple of the optical length of the fiber branch. The repetition rate of the ultrashort laser pulses is the reciprocal of the propagation time of the laser pulses through the fiber branch.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: October 19, 2021
    Assignee: Coherent, Inc.
    Inventors: Norman Hodgson, Dmitri Simanovski
  • Patent number: 11115126
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: May 9, 2019
    Date of Patent: September 7, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittie, Jing Wang
  • Patent number: 11108211
    Abstract: The invention is a Demodulator for an Optical Analog Pulse Position Modulated signal suitable for inclusion in receivers for Free Space Optical communication systems. In one embodiment the Demodulator may use the pulse position modulated optical information signal and the clock signal with different wavelengths. By proper biasing of a Semiconductor Optical Amplifier and selection of wavelengths for the information signal and the clock signal, the performance of the Demodulator is made insensitive to noise in the received signals.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: August 31, 2021
    Assignee: HRL Laboratories, LLC
    Inventors: Daniel Yap, Monica Minden
  • Patent number: 11088761
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: August 10, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Chuang Zhou, Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittle, Jing Wang
  • Patent number: 11057111
    Abstract: The systems, apparatuses and methods of the present invention set forth improvements to the problems of the current pairing or duplex paradigm, resulting in a dramatic increase in fiber transmission efficiency, accomplished explicitly by restructuring presently-aligned C-B and wavelengths into innovative DWDM transmit and receive formats, and through implementing photonic-wave changes, which directs Ethernet data flow onto new path adaptations. These improvements could reduce line haul expenses significantly, believed to reach a projected 50% less requirement/deployment of fiber strands. This saving would offer owner-operators substantial fiber strand cost reductions, affecting transportation rates of high-bandwidth digital payloads traversing over DWDM networks, and lower usage rates of cross-connections amid multiple equipment inter-exchanging throughout large data centers.
    Type: Grant
    Filed: November 2, 2020
    Date of Patent: July 6, 2021
    Assignee: NOVEC Solutions, Inc.
    Inventor: Marvin W. Ward
  • Patent number: 11048096
    Abstract: A light source device includes: a light source part comprising a plurality of laser light sources, each laser light source being configured to emit light having a predetermined wavelength width; a plurality of collimators; a light-condensing part configured to adjust light emitted from the collimators into parallel light and to condense the parallel light; a diffraction grating configured to receive the condensed light; and an output coupler disposed in an optical path of diffracted light from the diffraction grating so as to form an external resonator with the laser light sources, wherein a reflecting surface of the output coupler is a depressed surface; and an adjusting lens disposed downstream of the output coupler, the adjusting lens being configured to convert light emitted from the output coupler into substantially parallel light or to condense the light emitted from the output coupler.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: June 29, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Norihiro Dejima, Takahiro Oyu
  • Patent number: 11043787
    Abstract: A system and method for tuning and infrared source laser in the Mid-IR wavelength range. The system and method comprising, at least, a plurality of individually tunable emitters, each emitter emitting a beam having a unique wavelength, a grating, a mirror positioned after the grating to receive at least one refracted order of light of at least one beam and to redirect the beam back towards the grating, and a micro-electro-mechanical systems device containing a plurality of adjustable micro-mirrors.
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: June 22, 2021
    Assignee: TERADIODE, INC.
    Inventors: Bien Chann, Robin Huang, Parviz Tayebati
  • Patent number: 11041710
    Abstract: A wavelength tunable laser device includes a gain element positioned in an optical cavity that provides optical gain to an optical signal. A frequency shifter that generates a frequency shift as a function of time is positioned in the optical cavity. The optical cavity is configured so that a magnitude of the frequency shift as a function of time generated by the frequency shifter is substantially equal to a frequency separation of a cavity mode of the cavity such that an output of the cavity generates laser light having a wavelength that tunes as a function of time.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: June 22, 2021
    Inventor: Eric Swanson
  • Patent number: 11025344
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: June 1, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittle
  • Patent number: 10992098
    Abstract: A waveguide gas laser having a laser resonator cavity of a variable length is subjected to cyclical varying of the length of the cavity during generation of a laser beam a length variation amount sufficient to force a laser beam generated in the resonator cavity though a substantially complete optical longitudinal cavity mode at a rate operable to smooth at least one laser beam parameter variation. In this manner variation in the laser beam parameter is averaged by moving through at least a portion of an optical longitudinal cavity mode.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: April 27, 2021
    Assignee: Epilog Corporation
    Inventors: Jeffery A Broderick, Patrick B Kohl
  • Patent number: 10985534
    Abstract: In various embodiments, monitoring of one or more secondary diffracted beams formed within a laser resonator provides information based at least in part on which a primary diffracted beam formed within the laser resonator is controlled.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: April 20, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Wang-Long Zhou, Bryan Lochman, Bien Chann
  • Patent number: 10978850
    Abstract: A laser system, comprised of: a laser cavity; a gain medium a pump, a saturable absorber (SA); a first mirror and a second mirror; wherein a ratio of an area of the beam area within the SA to an area of the laser beam within the gain medium is greater than 1, and wherein the beam generates a gain medium radius spot on the gain medium and a saturable absorber radius spot on the saturable absorber such that a ratio between a saturable absorber radius spot on the saturable absorber and the gain medium radius spot on the gain medium is within a range of 1.7-7 is disclosed. A method for using the laser system e.g., for producing a pulsed energy is further disclosed.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: April 13, 2021
    Assignee: JERUSALEM COLLEGE OF TECHNOLOGY
    Inventors: Salman Noach, Daniel Sebbag
  • Patent number: 10966613
    Abstract: An apparatus can be provided which can include a laser arrangement which can be configured to provide a laser radiation, and can include an optical cavity. The optical cavity can include a dispersive optical first arrangement which can be configured to receive and disperse at least one first electro-magnetic radiation so as to provide at least one second electro-magnetic radiation. Such cavity can also include an active optical modulator second arrangement which can be configured to receive and modulate the at least one second radiation so as to provide at least one third electro-magnetic radiation. The optical cavity can further include a dispersive optical third arrangement which can be configured to receive and disperse at least one third electro-magnetic radiation so as to provide at least one fourth electro-magnetic radiation.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: April 6, 2021
    Assignee: The General Hospital Corporation
    Inventors: Benjamin Vakoc, Meena Siddiqui, Serhat Tozburun
  • Patent number: 10965094
    Abstract: A laser device includes a wavelength-tunable laser including plural wavelength selectors in an optical resonator; a semiconductor optical amplifier that amplifies the laser light input thereto; a light intensity variation detector that detects variation in intensity of the laser light output from the wavelength-tunable laser before the laser light is input to the semiconductor optical amplifier; a wavelength dithering generation unit that generates a resonator mode wavelength dithering to modulate a resonator mode of the resonator; a wavelength dithering feedback controller that performs, on the resonator mode wavelength dithering, feedback control based on the variation in intensity detected by the light intensity variation detector; a light intensity detector that detects an intensity of the laser light output from the semiconductor optical amplifier; and a semiconductor optical amplifier feedback controller that performs feedback control on the semiconductor optical amplifier based on the intensity detecte
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: March 30, 2021
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Yasumasa Kawakita, Kazuaki Kiyota, Yasutaka Higa
  • Patent number: 10944478
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: March 9, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Junwen Zhang, Zhensheng Jia, Luis Alberto Campos, Haipeng Zhang, Mu Xu, Jing Wang, Curtis Dean Knittie, Chuang Zhou
  • Patent number: 10917177
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: February 9, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittie
  • Patent number: 10890434
    Abstract: Inspecting a multilayer sample may include receiving, at a beam splitter, light and splitting the light into first and second portions; combining, at the beam splitter, the first portion of the light after being reflected from a multilayer sample and the second portion of the light after being reflected from a reflector; receiving, at a computer-controlled system for analyzing Fabry-Perot fringes, the combined light and spectrally analyzing the combined light to determine a value of a total power impinging a slit of the system for analyzing Fabry-Perot fringes; determining an optical path difference (OPD); recording an interferogram that plots the value versus the OPD for the OPD; performing the previous acts of the method one or more additional times with a different OPD; and using the interferogram for each of the different OPDs to determine the thicknesses and order of the layers of the multilayer sample.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: January 12, 2021
    Assignee: APPLEJACK 199 L.P.
    Inventor: Wojciech Jan Walecki
  • Patent number: 10879615
    Abstract: Embodiments of this application disclose an ODU and a transmit power control method for an ODU. The ODU includes a controller, a radio frequency processor, a waveguide channel, an antenna, a wave-absorbing block, a detector, and a motor controller. The controller is configured to obtain target transmit power, first transmit power, and a to-be-transmitted first radio frequency signal, and generate a control signal based on a difference between the target transmit power and the first transmit power. The radio frequency processor is configured to: perform frequency conversion on the first radio frequency signal to obtain the second radio frequency signal, and transmit the second radio frequency signal, where the second radio frequency signal is transmitted to the antenna through the waveguide channel. The wave-absorbing block has one end located in the waveguide channel and the other end connected to the motor controller.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: December 29, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yuxiang Zhou, Haiming Fan, Qing Zhao, Guoxiang Cao
  • Patent number: 10871699
    Abstract: Apparatus include an optical cavity including an optical coupling portion situated to couple an optical signal input field to an intracavity optical signal field and an optical control input field to an intracavity optical control field, wherein the optical cavity includes a nonlinear optical medium that mediates a selective exchange of at least one predetermined temporal mode between the intracavity optical signal field and an intracavity optical register field based on a nonlinear phase-matched interaction between the intracavity optical signal, control, and register fields and selectable field characteristics of the optical control input field.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: December 22, 2020
    Assignee: University of Oregon
    Inventors: Dileep V. Reddy, Michael G. Raymer
  • Patent number: 10777963
    Abstract: A laser device includes a laser medium for amplifying seed light, a first optical system for outputting excitation light for exciting the laser medium and causing the excitation light to be incident on the laser medium and input to an excitation region of the laser medium, and a second optical system for causing the seed light of first polarization to be incident on the laser medium at an incidence angle larger than 0° with respect to the laser medium and input to the excitation region.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: September 15, 2020
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Yuki Kabeya, Takashi Sekine, Yoshinori Kato
  • Patent number: 10634899
    Abstract: The present disclosure relates optical imaging devices and methods useful in biological and medical imaging applications. In one embodiment, an optical imaging device includes a flexible lightguide having a first end and a second end, the output of the source of pulsed infrared radiation being optically coupled to the first end of the flexible lightguide; a lens assembly attached to and optically coupled to the second end of the flexible lightguide, the lens assembly comprising a variable-focus lens element, the a variable-focus lens element having a tunable focal length; and a photodetector coupled to the flexible lightguide to detect radiation propagating from the second end toward the first end of the flexible lightguide. The optical imaging devices and methods can be used in both confocal and multi-photon techniques.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: April 28, 2020
    Assignee: The Regents of the University of Colorado, A Body Corporate
    Inventors: Juliet T. Gopinath, Emily A. Gibson, Victor M. Bright, Richard Weir, Diego Restrepo, Baris Ozbay
  • Patent number: 10623104
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: July 2, 2019
    Date of Patent: April 14, 2020
    Assignee: Cable Television Laboratories, Inc
    Inventors: Chuang Zhou, Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittle, Jing Wang
  • Patent number: 10615564
    Abstract: A mode-locked laser comprising circuitry configured to drive an electro-optic modulator (EOM) in the mode-locked laser with a drive waveform, the drive waveform being a phase-coherent sinusoidal waveform at a frequency equal to a repetition rate of the mode-locked laser, a phase-coherent pulsed waveform at a frequency equal to the repetition rate of the mode-locked laser, or a phase-coherent sinusoidal waveform at a frequency equal to half of the repetition rate of the mode-locked laser.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: April 7, 2020
    Assignee: Thorlabs, Inc.
    Inventors: Jeffrey S. Brooker, William Radtke, Hongzhou Ma, Eric Lieser
  • Patent number: 10615044
    Abstract: A method of cutting a semiconductor material by irradiating the semiconductor material with laser energy, includes providing a laser source adapted to emit successive pulses of laser beams, each laser beam pulse having a pulse width of 100 picoseconds or less, emitting laser beam pulses from the laser source, guiding the emitted laser beam pulses to irradiate semiconductor material to be cut, and moving the semiconductor material relative to the irradiating laser beam pulses to cut the semiconductor material along a cutting line. The semiconductor material is irradiated by a plurality of laser beam pulses with a pulse repetition frequency in the range from 0.1 GHz to 5000 GHz.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: April 7, 2020
    Assignee: ASM TECHNOLOGY SINGAPORE PTE LTD
    Inventors: Sergio Andrés Vázquez-Córdova, Ruslan Rifovich Subkhangulov
  • Patent number: 10601197
    Abstract: A femtosecond laser oscillator includes a 532 nm pump laser light, a Ti-doped sapphire, a laser resonator, and a dispersion compensation element, etc. The 532 nm pump laser light is radiated via a pump laser light guide device to the Ti-doped sapphire and generates stimulated radiation, the stimulated radiation light oscillates back and forth in the laser resonator and thereby is amplified, and continuous light is outputted. The dispersion compensation element is disposed in the resonator to compensate the dispersion of the outputted laser light resulted from oscillation of the laser light in the resonator to attain a mode locking condition. The mode locking means of the laser against disturbance is implemented in a form of return light outside the resonator, specifically, the emitted continuous light is returned to a femtosecond laser partially and thereby mode locking is achieved, and output of femtosecond pulses is realized.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: March 24, 2020
    Assignee: DAHENG NEW EPOCH TECHNOLOGY INC.
    Inventors: Yi Zhang, Meng Liu, Haitao Fan, Siyi Yao
  • Patent number: 10585332
    Abstract: A tunable electro-optic modulation (EOM) comb generator includes a frequency locking optoelectronic oscillator (OEO) loop including RF electrical components including a phase shifter (PS1), a splitter, and optical components including an intensity modulator (IM) coupled to receive light from a light source and to couple modulated light generated to a frequency locking loop including a frequency shifter, a first phase modulator (PM1), and a periodic optical filter (POF), such as an etalon or resonator. The POF is for optically filtering the OEO loop to generate an optical output and the splitter is for generating RF electrical outputs including at least one RF output coupled to an input of the IM and another RF output coupled to an EO comb including at least a phase modulator. The EO comb combines the optical output and the another RF output to generate a broadband optical frequency comb output.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: March 10, 2020
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Michael Plascak, Ricardo Bustos Ramirez, Peter Delfyett
  • Patent number: 10564533
    Abstract: Examples of light projector systems for directing input light from a light source to a spatial light modulator are provided. For example, an optical device is disclosed which includes a first surface having a diffractive optical element, a second surface normal to the first surface, and a third surface arranged at an angle to the second surface. The third surface may be a beam splitting surface that is reflective to light of a first state and transmissive to light of a second state. The diffractive optical element may receive an input beam made up of light having the first state, and convert the input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: February 18, 2020
    Assignee: Magic Leap, Inc.
    Inventors: Jahja Trisnadi, Pierre St. Hilaire, Hui-Chuan Cheng, Clinton Carlisle, Michael Anthony Klug, Kevin Richard Curtis
  • Patent number: 10541505
    Abstract: A high-power ytterbium-doped calcium fluoride laser system is disclosed herein which includes at least one pump source, at least one laser cavity formed by at least one high reflector and at least one output coupler, and at least one ytterbium-doped calcium fluoride optical crystal positioned within the laser cavity in communication with the pump source, the ytterbium-doped calcium fluoride optical crystal configured to output at least one output signal of at least 20 W, having a pulse width of 200 fs or less, and a repetition rate of at least 40 MHz.
    Type: Grant
    Filed: December 2, 2017
    Date of Patent: January 21, 2020
    Assignee: Newport corporation
    Inventors: Joseph Schaar, Ching-Yuan Chien, Richard Boggy, James D. Kafka, Adi Diner
  • Patent number: 10505345
    Abstract: A mode locking semiconductor disk laser (SDL) comprising a resonator terminated by first and second mirrors and folded by a third mirror is presented. The third mirror includes a semiconductor disk laser (SDL) suitable for generating a resonator field having a predetermined central wavelength ?0, while the second mirror includes an intensity saturable mirror suitable for mode locking the resonator field at the predetermined wavelength. The central wavelength of the reflectivity profile of the first and or second mirrors is shifted to a wavelength shorter than the central wavelength ?0 to suppress gain at wavelengths longer than the central wavelength ?0. By mismatching the reflectivity profile of the first and or second mirrors to that of the desired output wavelength provides a stable mode locked laser with significantly reduced noise.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: December 10, 2019
    Assignee: Solus Technologies Limited
    Inventors: Craig James Hamilton, Graeme Peter Alexander Malcolm
  • Patent number: 10488732
    Abstract: Example embodiments relate to an electro-optical device that includes a vertical p-i-n diode waveguide. The electro-optical device includes a waveguide portion adapted for propagating a multimode wave, the waveguide portion including an intrinsic semiconductor region of the vertical p-i-n diode, a first contact and a second contact for electrically contacting a first electrode and a second electrode of the vertical p-i-n diode. The device also includes an input section for coupling radiation into the waveguide portion and an output section for coupling radiation out of the waveguide portion. The input section, the output section, and the waveguide portion are configured to support a multimode interference pattern for the multimode wave with an optical field with a lateral inhomogeneous spatial distribution in the waveguide portion including regions with higher optical field intensity and regions with lower optical field intensity. The second contact physically contacts the second electrode.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: November 26, 2019
    Assignees: IMEC VZW, UNIVERSITEIT GENT
    Inventors: Ashwyn Srinivasan, Joris Van Campenhout
  • Patent number: 10447404
    Abstract: An injection locked transmitter for an optical communication network includes a master seed laser source input substantially confined to a single longitudinal mode, an input data stream, and a laser injected modulator including at least one slave laser having a resonator frequency that is injection locked to a frequency of the single longitudinal mode of the master seed laser source. The laser injected modulator is configured to receive the master seed laser source input and the input data stream, and output a laser modulated data stream.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: October 15, 2019
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Zhensheng Jia, Luis Alberto Campos, Curtis Dean Knittle
  • Patent number: 10432315
    Abstract: One example includes an optical transmitter system. The system includes a waveguide to receive and propagate an optical signal. The system also includes a ring modulation system comprising a ring resonator that is optically coupled to the waveguide and is to resonate a given wavelength of the optical signal in response to an input data signal that is provided to a modulation amplifier to provide carrier injection to change a refractive index of the ring resonator to resonate the given wavelength of the optical signal to modulate the optical signal. The system further includes a tuning controller associated with the ring modulation system. The tuning controller can implement iterative feedback tuning of the ring modulation system based on a relative amplitude of an optical intensity of the given wavelength in the ring resonator and a variable reference amplitude to substantially stabilize the ring resonator with respect to the given wavelength.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: October 1, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Janet Chen, Cheng Li, Marco Fiorentino, Raymond G Beausoleil
  • Patent number: 10424895
    Abstract: A mode-locked fiber laser device is provided in the disclosure. The mode-locked fiber laser device includes a non-linear loop mirror, an optical splitter and a uni-directional loop. The uni-directional loop includes a polarization beam splitter and a Faraday rotator. The uni-directional loop is coupled to the non-linear loop mirror by the optical splitter to form a figure-8 optical path. A first output laser pulse output by the optical splitter is propagated to the polarization beam splitter. After being rotated 45 degrees by a Faraday rotator, the first output laser pulse is propagated back to the non-linear loop mirror to form a laser resonator. A second output laser pulse output by the optical splitter is propagated to the Faraday rotator to rotate the second output laser pulse 45 degrees, and the polarization beam splitter reflects the second output laser pulse to the outside of the mode-locked fiber laser device.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: September 24, 2019
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventor: Jin-Long Peng
  • Patent number: 10367329
    Abstract: Direct diode-pumped Ti:sapphire laser amplifiers use fiber-coupled laser diodes as pump beam sources. The pump beam may be polarized or non-polarized. Light at wavelengths below 527 nm may be used in cryogenic configurations. Multiple diode outputs may be polarization or spectrally combined.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: July 30, 2019
    Assignee: KM Labs Inc.
    Inventors: Matthew S. Kirchner, Sterling Backus
  • Patent number: 10350702
    Abstract: Disclosed is a method of welding dissimilar metals, including: preparing a dissimilar metal bus bar composed of a plate-shaped first member made of a first metal and a plate-shaped second member made of a second metal disposed under the first member; folding one side of the dissimilar metal bus bar so that a portion of the second member is located on a portion of the first member; welding a lead made of the first metal on the first member; and welding a lead made of the second metal to the second member located on the portion of the first member, thus solving cracking or corrosion problems of a conventional welding process and also welding an over-lay clad metal with leads, thereby generating economic benefits and increasing the convenience of the welding process.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: July 16, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Jinsoo Lee, Taesu Kim, Sangyoon Jeong, Bugon Shin
  • Patent number: 10326251
    Abstract: A mode-locked laser (MLL) that produces ultra-low phase noise optical and RF outputs, includes two nested resonant optical cavities including an optical fiber-based cavity and an etalon, and a three bandwidth Pound-Drever-Hall (PDH) frequency stabilizer assembly incorporating three different optical bandpass filters. The optical fiber-based cavity is characterized by a free spectral range, FSRfiber, and the etalon is characterized by a free spectral range, FSRfilter, wherein FSRfilter/FSRfiber is an integer equal to or greater than 2. A method of generating ultra-low phase noise optical and RF outputs is disclosed. Optical and RF outputs have a phase noise that is less than ?100 dBc/Hz at 1 Hz and less than ?150 dBc at 10 KHz.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: June 18, 2019
    Assignee: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Peter Delfyett, Anthony Klee, Kristina Bagnell
  • Patent number: 10309769
    Abstract: The present invention relates to a light source device and a measuring device which use a change in mode-locked resonated output light over time using a change in a cycle of an electrical signal corresponding to a change in the intensity of the output light according to a mode locking condition for each of different light paths in a resonator. The light source device includes an electrical signal generator configured to control the intensity of an optical signal from the light source device, and an optical gain unit controlled by periodic electrical signals having cycles calculated by dividing a round-trip time of photons corresponding to each of different light paths by an integer multiple. The intensity of the optical signal is controlled by the optical gain unit.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: June 4, 2019
    Assignee: Pusan National University Industry-University Cooperation Foundation
    Inventors: Changseok Kim, Hwidon Lee, Myungyung Jeong, Gyeonghun Kim
  • Patent number: 10285757
    Abstract: Methods, systems and apparatus are disclosed for delivery of pulsed treatment radiation by employing a pump radiation source generating picosecond pulses at a first wavelength, and a frequency-shifting resonator having a lasing medium and resonant cavity configured to receive the picosecond pulses from the pump source at the first wavelength and to emit radiation at a second wavelength in response thereto, wherein the resonant cavity of the frequency-shifting resonator has a round trip time shorter than the duration of the picosecond pulses generated by the pump radiation source. Methods, systems and apparatus are also disclosed for providing beam uniformity and a sub-harmonic resonator.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: May 14, 2019
    Assignee: CYNOSURE, LLC
    Inventors: John Robertson, Daniel Hohm, Christian Hoffman
  • Patent number: 10253756
    Abstract: A configuration is provided which includes: a reference light source to emit laser light; an optical phase modulator to perform phase modulation of transmission light of the laser light on the basis of a linear-phase-modulation signal having a first frequency component and a second frequency component; an optical intensity modulator to modulate light intensity of the transmission light on the basis of a pulsed light generation signal for generation of pulsed light; first and second optical antennas to emit the transmission light to a space and receive reflected light from a first point and a second point; an optical receiver to perform heterodyne detection on light obtained by mixing received light and local oscillation light; and a signal processor to separate a received signal on the basis of the first and the second frequency components.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: April 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Eisuke Haraguchi, Toshiyuki Ando
  • Patent number: 10250292
    Abstract: An optical receiver and communication method receives an optical signal by an optical resonator to provide an intensity modulated signal indicative of a modulation of the optical signal. The intensity modulated signal is provided to a channel receiver of a plurality of channel receivers, and the channel receiver recovers from the intensity modulated signal a multipath version of a transmitted signal embedded in the modulation of the optical signal. The channel receiver's output is combined with an output of at least one other of the plurality of channel receivers to provide a combined output signal.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: April 2, 2019
    Assignee: RAYTHEON COMPANY
    Inventors: Gary M. Graceffo, Andrew Kowalevicz, Benjamin P. Dolgin
  • Patent number: 10224694
    Abstract: The present disclosure provides methods and apparatus to improve the dynamic coherent length of a sweep velocity-locked laser pulse generator (SV-LLPG) in an all-electronic fashion. A digital SV-LLPG is disclosed with two operation modes, i.e., unidirectional and bidirectional sweep modes; self-adaptive and time-dependent loop parameters (gain and location of poles/zeros); and, self-adaptive initial input curve. High frequency locking architectures, both single-side band (SSB) modulation method and direct phase measurement method, are provided to suppress the linewidth, or improve the coherent length, of the swept laser. A combination of high and low frequency locking, or a combination of multiple architectures disclosed in this invention, is utilized to achieve a higher level of linewidth reduction.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: March 5, 2019
    Assignee: Rhode Island Board of Education, State of Rhode Island and Providence Plantations
    Inventors: Tao Wei, Zhen Chen, Gerald Hefferman
  • Patent number: 10193296
    Abstract: A pulsed fiber generator is configured with a unidirectional ring waveguide configured to emit a train of pulses. The ring waveguide includes multiple fiber amplifiers, chirping fiber components coupled to respective outputs of first and second fiber amplifiers, and multiple spectral filters coupled to respective outputs of the chirping components. The filters have respective spectral band passes centered around different central wavelengths so as to provide leakage of light along the ring cavity in response to nonlinear processes induced in the ring cavity. The pulse generator operates at a preliminary stage during which it is configured to develop a pitch to a signal, and at a steady stage during which it is configured to output a train of pulses through an output coupler at most once per a single round trip of the signal.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: January 29, 2019
    Assignee: IPG PHOTONICS CORPORATION
    Inventors: Igor Samartsev, Andrey Bordenyuk
  • Patent number: 10177525
    Abstract: A passive mode-locked laser method and system, the system comprising a nonlinear optical loop comprising a resonant nonlinear element, coupled to an amplification section by a beam splitter, the beam splitter splitting a light beam from the amplification section into light beams propagating in opposite directions around the nonlinear optical loop, the resonant nonlinear element acting as both a nonlinear element and a narrow bandwidth filter for the laser system, allowing mode-locking operation of the system on a single resonance of the resonant nonlinear element.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: January 8, 2019
    Assignee: INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Yoann Jestin, Roberto Morandotti, Michael Kues, Benjamin Wetzel, Christian Reimer, Piotr Roztocki
  • Patent number: 10168429
    Abstract: An FM LIDAR system is described that includes a frequency modulated LIDAR system that incorporates a laser source that is optically coupled to a whispering gallery mode optical resonator. Light from the laser that is coupled into the whispering gallery mode optical resonator is coupled back out as a returning counterpropagating wave having a frequency characteristic of a whispering gallery mode of the optical resonator. This returning wave is used to reduce the linewidth of the source laser by optical injection. Modulation of the optical properties of the whispering gallery mode optical resonator results in modulation of the frequency of the frequencies supported by whispering gallery modes of the resonator, and provides a method for producing highly linear and reproducible optical chirps that are highly suited for use in a LIDAR system. Methods of using such an FM LIDAR system and vehicle assisting systems that incorporate such FM LIDAR systems are also described.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: January 1, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Lutfollah Maleki, Andrey B. Matsko