Polarization Patents (Class 372/27)
  • Patent number: 10348055
    Abstract: A laser apparatus is provided, comprising a semiconductor substrate, an active layer disposed on the semiconductor substrate, a folded waveguide disposed on the active layer and forming a resonant structure, the folded waveguide comprising at least two substantially straight waveguide portions coupled by a connecting waveguide structure, with the folded waveguide having a first end and a second end located at one or more edges of the semiconductor substrate, wherein at least one of the ends includes a mirror, and an electrode coupled to the folded waveguide and configured to create photons in the folded waveguide when receiving electrical power. The waveguide emits laser light comprising the photons, with the laser light emitted at an edge of the semiconductor substrate.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: July 9, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventor: Ning Cheng
  • Patent number: 10194515
    Abstract: A beam delivery system may include: beam adjusters configured to adjust a divergence angle of a pulse laser beam; a beam sampler configured to separate a part of the pulse laser beam outputted from a first beam adjuster provided at the most downstream among the beam adjusters to acquire a sample beam; a beam monitor configured to receive the sample beam and output a monitored diameter; and a beam delivery controller configured to control the beam adjusters based on the monitored diameter. The beam delivery controller may adjust each of beam adjusters other than the first beam adjuster selected one after another from the most upstream so that the monitored diameter at the beam monitor becomes a predetermined value specific to the beam adjuster, and adjust the first beam adjuster so that the pulse laser beam becomes focused at a position downstream of a target position.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: January 29, 2019
    Assignee: Gigaphoton Inc.
    Inventors: Yoshifumi Ueno, Takashi Suganuma, Yoshiaki Kurosawa
  • Patent number: 10153849
    Abstract: The invention provides a free space optical (FSO) communications terminal for a first telecommunications card or a backplane. The FSO terminal comprises a plurality of transmission interfaces. The FSO terminal further comprises a light signal generating unit adapted to generate a plurality of light signals. Each of the plurality of light signals carries the same information as the other one or more of the plurality of light signals and is arranged for transmission through a respective one of the plurality of transmission interfaces. Each of the plurality of light signals is at a different orthogonal mode from the other one or more of the plurality of light signals. The invention further provides a free space optical (FSO) communications terminal for a second telecommunications card or a backplane. The FSO terminal comprises a plurality of receive interfaces. Each of the plurality of receive interfaces adapted to receive a light signal carrying information.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: December 11, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Antonio D'Errico, Antonella Bogoni, Fabio Cavaliere, Luca Giorgi
  • Patent number: 10114270
    Abstract: An optical logic device includes a distributed feedback laser configured to generate a first signal corresponding to distributed feedback laser output signal, the first signal being at a first wavelength. The device further includes a bandpass filter having a center frequency corresponding to the first wavelength. Additionally, the device can include an optical circulator having a first port coupled to a logic device input signal, a second port coupled to the first signal, and a third port coupled to the bandpass filter, wherein when the logic device input signal has a power above a predetermined threshold and there is a wavelength difference between the first wavelength and an input wavelength of the logic device input signal, a suppression of the first signal occurs.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: October 30, 2018
    Assignee: King Fahd University of Petroleum and Minerals
    Inventor: Khurram Karim Qureshi
  • Patent number: 9995868
    Abstract: The present invention discloses a light guide plate, a backlight module and a display device, so as to solve the technical problem of color shift generated in prior art display panel due to the change of angle of view. The light guide plate comprises a bottom surface, a light exiting surface opposite to the bottom surface, and a quantum dot layer provided on the light exiting surface and comprising a quantum dot array, wherein the light exiting surface has a non-planar structure. Embodiments of the present invention provide following advantageous effects: the quantum dots on the surface of the light guide plate are configured to have a non-planar structure, such that the light transmitted through the spacing between quantum dots and having the same spectrum as the quantum dots is smoothly changed, thereby reducing the affection of color shift of the display device due to the change of angle of view.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: June 12, 2018
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Kim-Hee Cheol, Song-Young Suk, Yoo-Seong Yeol, Choi-Seung Jin
  • Patent number: 9778541
    Abstract: Provided are an acousto-optic element, an acousto-optic element array, and a display apparatus including the acousto-optic element array. The acousto-optic element includes: an acousto-optic modulator which includes an acousto-optic layer formed of an acousto-optic material; a light supplier which supplies light to the acousto-optic modulator in a first direction; a first sound-wave modulator which applies first elastic waves to the acousto-optic modulator in a second direction; and a second sound-wave modulator which applies second elastic waves to the acousto-optic modulator in a third direction. The light supplied from the light supplier to the acousto-optic modulator is deflected by diffraction caused by the first elastic waves applied from the first sound-wave modulator and diffraction caused by the second elastic waves applied from the second sound-wave modulator, and is output from the acousto-optic modulator through a front side of the acousto-optic modulator.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: October 3, 2017
    Assignees: SAMSUNG ELECTRONICS CO., LTD., AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Seung-hoon Han, Won-taek Seo, Hae-kwan Oh, Hong-seok Lee, Eun-hyoung Cho, Kee-keun Lee
  • Patent number: 9645500
    Abstract: A radiation source includes a nozzle configured to direct a stream of fuel droplets along a droplet path towards a plasma formation location, and is configured to receive a gaussian radiation beam having gaussian intensity distribution, having a predetermined wavelength and propagating along a predetermined trajectory, and further configured to focus the radiation beam on a fuel droplet at the plasma formation location. The radiation source includes a phase plate structure including one or more phase plates. The phase plate structure has a first zone and a second zone. The zones are arranged such that radiation having the predetermined wavelength passing through the first zone and radiation having the predetermined wavelength passing through the second zone propagate along respective optical paths having different optical path lengths. A difference between the optical path lengths is an odd number of times half the predetermined wavelength.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: May 9, 2017
    Assignee: ASML NETHERLANDS B.V.
    Inventors: Oscar Franciscus Jozephus Noordman, Markus Franciscus Antonius Eurlings
  • Patent number: 9570888
    Abstract: An optical device has a gallium and nitrogen containing substrate including a surface region and a strain control region, the strain control region being configured to maintain a quantum well region within a predetermined strain state. The device also has a plurality of quantum well regions overlying the strain control region.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: February 14, 2017
    Assignee: SORAA LASER DIODE, INC.
    Inventors: James W. Raring, Christiane Poblenz Elsass
  • Patent number: 9572218
    Abstract: A light source system that generates stable optical power over time and temperature in which a feedback control circuit is operative to receive a temperature signal and a sample signal and in response thereto generate a control signal to a driver circuit to maintain a power level of the light output substantially constant over an operative temperature range defined by Tmin and Tmax.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: February 14, 2017
    Assignee: USL Technologies, LLC
    Inventor: John P. Downing
  • Patent number: 9407062
    Abstract: A wavelength tracking Fabry-Perot Laser Diode (F-P LD), and an optical transmitter including the same are disclosed, the wavelength keepable F-P LD including a gain section configured to provide and modulate a gain using an injected first current; and a phase shift/modulation section configured to vary wavelength relative to oscillation mode of light advanced from the gain section by injected second current or voltage and to modulate phases.
    Type: Grant
    Filed: December 15, 2012
    Date of Patent: August 2, 2016
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chang-Hee Lee, Joon-Young Kim, Sang-Rok Mun, Sang-Hwa Yoo, Byungil Seo, Myeonggyun Kye, Jian Chang
  • Patent number: 9379522
    Abstract: An optical device has a gallium and nitrogen containing substrate including a surface region and a strain control region, the strain control region being configured to maintain a quantum well region within a predetermined strain state. The device also has a plurality of quantum well regions overlying the strain control region.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: June 28, 2016
    Assignee: SORAA LASER DIODE, INC.
    Inventors: James W. Raring, Christiane Poblenz Elsass
  • Patent number: 9107279
    Abstract: Techniques for generating EUV light include directing a first pulse of radiation toward a target material droplet to form a modified droplet, the first pulse of radiation having an energy sufficient to alter a shape of the target material droplet; directing a second pulse of radiation toward the modified droplet to form an absorption material, the second pulse of radiation having an energy sufficient to change a property of the modified droplet, the property being related to absorption of radiation; and directing an amplified light beam toward the absorption material, the amplified light beam having an energy sufficient to convert at least a portion of the absorption material into extreme ultraviolet (EUV) light.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: August 11, 2015
    Assignee: ASML Netherlands B.V.
    Inventors: Robert J. Rafac, Yezheng Tao
  • Patent number: 9036248
    Abstract: A terahertz light generation device 1 comprises a resonator structure 12 for intensifying incident light and outputting the intensified light and laser oscillation units 10, 11 for feeding the incident light into the resonator structure 12. The incident light comprises first and second incident light components having polarization states different from each other and frequencies different from each other. The laser oscillation units 10, 11 feed the resonator structure 12 with the first and second incident light components at an angle inclined from a principal surface in the resonator structure 12. The resonator structure 12 outputs light having a frequency corresponding to the difference between the respective frequencies of the first and second incident light components.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: May 19, 2015
    Assignees: Osaka Prefecture University Public Corporation, Sumitomo Electric Industries, Ltd.
    Inventors: Hajime Ishiahara, Atsuyuki Oyamada, Satoshi Kuzuhara, Hisanobu Kitaguchi, Keiji Ebata
  • Publication number: 20150102864
    Abstract: A light emitting device includes a first semiconductor multilayer film mirror of a first conductivity type, a second semiconductor multilayer film mirror of a second conductivity type that is different from the first conductivity type, an active layer formed between the first semiconductor multilayer film mirror and the second semiconductor multilayer film mirror, a third semiconductor multilayer film mirror of a semi-insulating type formed between the first semiconductor multilayer film mirror and the active layer, and a contact layer of the first conductivity type formed between the third semiconductor multilayer film mirror and the active layer, and the third semiconductor multilayer film mirror is formed of a material having a bandgap energy higher than an energy of light generated in the active layer.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 16, 2015
    Inventor: Tetsuo NISHIDA
  • Patent number: 8976823
    Abstract: In at least one embodiment a laser system includes a fiber laser source, a polarization controller and a wavelength converter. The relative power distribution between a pump wavelength and a signal wavelength is controllable using the polarization controller. An optional phase compensator is used to control polarization state of the output laser beam. In various embodiments the relative power distribution among multiple wavelengths may be controlled over a range of at least about 100:1.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: March 10, 2015
    Assignee: IMRA America, Inc.
    Inventors: Jingzhou Xu, Gyu Cho
  • Patent number: 8964802
    Abstract: A ring laser-resonator generating plane-polarized fundamental-frequency radiation includes an optically nonlinear crystal configured for type-II second-harmonic generation of fundamental-frequency radiation. The resonator is configured such that fundamental-frequency radiation circulating either clockwise or counter-clockwise therein makes two passes through the optically nonlinear crystal per round-trip in the resonator in opposite directions, with polarization planes perpendicular to each other. This arrangement forces unidirectional circulation of radiation in the resonator during which second-harmonic radiation is not generated by the crystal.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: February 24, 2015
    Assignee: Coherent, Inc.
    Inventor: Andrea Caprara
  • Patent number: 8937977
    Abstract: A laser anti-reflection device includes a polarizing beam splitter, a ?/4 wave plate and an absorber disposed in an outgoing light path of a laser emitting linearly polarized light with a wavelength of ?. The linearly polarized light from the laser passes through the polarizing beam splitter and the ?/4 wave plate in turn to become a circularly polarized light beam. Part of the circularly polarized light beam is then reflected by a workpiece to be processed along the original light path and passes the ?/4 wave plate to become a linearly polarized light beam with a polarization direction vertical to that of the outgoing linearly polarized light beam. The vertical polarized beam passes the polarizing beam splitter, deviates from the light path of the outgoing linearly polarized light beam and reaches the absorber. The laser anti-reflection device prevents reflected light from damaging the laser from high power lasers.
    Type: Grant
    Filed: November 26, 2011
    Date of Patent: January 20, 2015
    Assignee: Beijing Luhe Feihong Laser S&T Co., Ltd.
    Inventors: Zhiyong Wang, Wenbin Qin, Yinhua Cao, Jingjing Dai, Tingwu Ge
  • Publication number: 20150010029
    Abstract: A laser pulse shaping method is configured for microscopically viewing and modifying an object. A temporal modulation and a two-dimensional spatial modulation of laser pulses are carried out. At least the phase of the laser pulses is modulated dependent on the location, and the modulated laser pulses are directed at the object.
    Type: Application
    Filed: January 17, 2013
    Publication date: January 8, 2015
    Applicant: FREIE UNIVERSITAET BERLIN
    Inventors: Albrecht Lindinger, Karsten Heyne
  • Patent number: 8923351
    Abstract: In the field of the production of very high frequencies, for example from 1 gigahertz to several terahertz, by beating the frequencies of two laser beams together, a device includes a resonant optical cavity having very stable dimensions receiving the beams, with for each beam, an interrogation device of the resonant cavity supplying an electrical signal representing the difference in frequency between the light frequency of the beam and a resonance frequency of the resonant cavity. The frequency of each beam is servo controlled to minimize the frequency difference observed. The laser beams are produced by a dual-frequency laser producing two beams of different frequencies and orthogonal polarizations. A polarization separator is used for separate servo control of the beams according to polarization, and a polarizer is placed behind a main output of the resonant cavity producing an electromagnetic beam mixing the two polarizations and amplitude-modulated at the beat frequency.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: December 30, 2014
    Assignee: Centre National de la Recherche Scientifique
    Inventors: Fran├žois Bondu, Marc Brunel, Mehdi Alouini, Marc Vallet, Goulc'hen Loas, Marco Romanelli
  • Patent number: 8923352
    Abstract: One embodiment is directed towards a stabilized laser including a laser to produce light at a frequency and a resonator coupled to the laser such that the light from the laser circulates therethrough. The laser also includes Pound-Drever-Hall (PDH) feedback electronics configured to adjust the frequency of the light from the laser to reduce phase noise in response to light sensed at the reflection port of the resonator and transmission port feedback electronics configured to adjust the frequency of the light from the laser toward resonance of the resonator at the transmission port in response to the light sensed at the transmission port of the resonator, wherein the transmission port feedback electronics adjust the frequency at a rate at least ten times slower than the PDH feedback electronics.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: December 30, 2014
    Assignee: Honeywell International Inc.
    Inventors: Lee K. Strandjord, Tiequn Qiu, Glen A. Sanders
  • Publication number: 20140362881
    Abstract: A laser beam combining device includes three lasers, a polarizer, and a mode converter. The second laser device, the mode converter, and the third laser device are located on a first straight line in that order. The polarizer intersects with the first straight line at an imaginary joint point. An included angle between the first straight line and the polarizer is about 45 degrees. The polarizer and the mode converter are positioned between the second laser device and the third laser device. The polarizer is adjacent to the second laser device. The mode converter is adjacent to the third laser device. The first laser device faces the polarizer and is located on a second straight line perpendicular to the first straight line and passing through the joint point. The three laser devices emit TE mode red, green and blue laser beams, respectively.
    Type: Application
    Filed: October 30, 2013
    Publication date: December 11, 2014
    Applicant: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: PO-CHOU CHEN
  • Patent number: 8891562
    Abstract: Described herein is a laser (1) having a cavity for supporting oscillation of an electromagnetic signal to provide lasing action. A gain element (5) provides a source of stimulated emission for amplifying the oscillating signal. The laser also includes a wavelength selective element (7), which includes a reflecting element and a polarization modifying element. The reflecting element selectively defines a predetermined wavelength and the polarization modifying element selectively modifies the polarization of the signal component at the predetermined wavelength so as to provide high selectivity. The wavelength selective element (7) rotates the signal polarization at the predetermined wavelength into an orthogonal state. A polarization filter (9) filters out the signal components having wavelengths not corresponding to the predetermined wavelength and a polarization rotation element (11) again rotates the polarization of the signal into an orthogonal state.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: November 18, 2014
    Assignee: Finisar Corporation
    Inventors: Steven James Frisken, Daniel Royston Neill
  • Patent number: 8855152
    Abstract: A polarization modulation device for wideband laser comprises a first polarization maintaining optical fiber, a second polarization maintaining optical fiber, and a non-polarization maintaining optical fiber. The non-polarization maintaining optical fiber includes a first polarization controller coupled with the first polarization maintaining optical fiber, and a second polarization controller coupled with the second polarization maintaining optical fiber.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: October 7, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Yao Wun Jhang, Chien Ming Huang, Hsin Chia Su, Shih Ting Lin, Hong Xi Tsau
  • Patent number: 8798105
    Abstract: A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: August 5, 2014
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: John C. McCarthy, Katherine J. Snell, Christopher A. Miller
  • Publication number: 20140205293
    Abstract: The embodiments of the present invention disclose an External Cavity Laser (ECL), relate to the field of Wave Division Multiplexing-Passive Optical Network (WDM-PON) technology, and effectively solve a problem of unstable output optical power of the ECL caused by polarization dependence. The ECL includes a gain medium, a filter, and a Faraday Rotator Mirror (FRM). The gain medium, the filter and the FRM constitute an oscillation cavity, and light emitted by the gain medium oscillates back and forth in the oscillation cavity.
    Type: Application
    Filed: June 10, 2013
    Publication date: July 24, 2014
    Inventors: Huafeng LIN, Zhiguang XU, Guikai PENG
  • Publication number: 20140198814
    Abstract: The present invention discloses a wavelength modulation heterodyne light source, which comprises: a modulation unit, a wavelength modulated light source and a birefringent crystal. The modulation unit produces a triangular or sine wave modulating signal, and transmits the modulating signal to the wavelength modulated light source to generate a wavelength modulated light signal, then the modulated light signal is refracted by the birefringent crystal with two different optical paths caused by the two different refractivity of the crystal to generate a heterodyne light. With the application of the present invention, the heterodyne light source can be made to a relatively small size and save much cost compared with known heterodyne light sources at present.
    Type: Application
    Filed: February 25, 2013
    Publication date: July 17, 2014
    Applicant: National Central University
    Inventors: Ju-Yi LEE, Yu-Che CHUNG
  • Patent number: 8767783
    Abstract: A light source device is provided with a coherent light source for emitting the coherent light, and a pattern changer for changing an interference pattern of the coherent light on a surface of the illumination object. The pattern changer includes a photorefractive crystal which is arranged between the coherent light source and the illumination object and on an optical path of the coherent light and exhibits a photorefractive effect, and a changer for changing at least one of a light intensity distribution, a polarization direction, a wavelength and an intensity of coherent light incident on the photorefractive crystal. The illumination object is illuminated with the coherent light.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: July 1, 2014
    Assignee: Panasonic Corporation
    Inventors: Koichi Kusukame, Tetsuro Mizushima, Kazuhisa Yamamoto, Hiroyuki Furuya, Shinichi Kadowaki, Kiminori Mizuuchi
  • Patent number: 8768110
    Abstract: Various exemplary embodiments relate to an optical isolator in an integrated optical circuit including: a first optical modulator configured to provide a first periodic phase modulation on an input optical signal; a second optical modulator configured to provide a second periodic phase modulation on the modulated optical signal; and an optical waveguide having a length L connecting the first optical modulator to the second optical modulator; wherein the phase difference between the first and second periodic phase modulation is ?/2, and wherein the length L of the optical waveguide causes a phase delay of ?/2 on an optical signal traversing the optical waveguide.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: July 1, 2014
    Assignee: Alcatel Lucent
    Inventor: Christopher R. Doerr
  • Patent number: 8741673
    Abstract: The present invention relates to a polarized light emitting diode (LED) device and the method for manufacturing the same, in which the LED device comprises: a base, a light emitting diode (LED) chip, a polarizing waveguide and a packaging material. In an exemplary embodiment, the LED chip is disposed on the base and is configured with a first light-emitting surface for outputting light therefrom; and the waveguide, being comprised of a polarization layer, a reflection layer, a conversion layer and a light transmitting layer, is disposed at the optical path of the light emitted from the LED chip; and the packaging material is used for packaging the waveguide, the LED chip and the base into a package.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: June 3, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Cheng-Huan Chen, Han-Ping Yang, Hung-Yi Lin, Cheng-Hsuan Lin
  • Patent number: 8731011
    Abstract: The invention relates to a precision optical frequency tunable laser. The laser includes: a laser gain medium, an intracavity collimating lens, an active optical phase modulator, a tunable acousto-optic filter and an intracavity total reflection mirror all arranged sequentially in a laser cavity, and the tunable laser further includes an active polarization rotator, a polarization beam splitter, two etalons, a temperature control system attached to the etalons, two total reflection mirrors, a radio frequency signal source, a laser pumping source, an active optical phase modulator drive source, an active polarization rotator drive source and a laser drive control circuit. Through the temperature control system attached to the etalons, stable laser output and the precision optical frequency tuning less than 1 GHz within a wide spectrum range can be realized, thereby greatly reducing the bandwidth requirements in achieving narrowband filtering for the tunable acousto-optic filter.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: May 20, 2014
    Assignee: GP Photonics Inc.
    Inventor: Peiliang Gao
  • Publication number: 20140124685
    Abstract: An extreme ultraviolet light generation system used with a laser apparatus may be provided, and the extreme ultraviolet light generation system may include: a chamber including at least one window for at least one laser beam and a target supply unit for supplying a target material into the chamber; and at least one polarization control unit, provided on a laser beam path, for controlling a polarization state of the at least one laser beam.
    Type: Application
    Filed: January 10, 2014
    Publication date: May 8, 2014
    Applicant: GIGAPHOTON, INC.
    Inventors: Tatsuya YANAGIDA, Osamu WAKABAYASHI
  • Patent number: 8718103
    Abstract: The present invention relates to an apparatus for generating an ultra-short ultra-high intensity pulse laser, comprising: a pulse laser providing unit which generates an ultra-short ultra-high intensity pulse laser, stretches pulse width, then selects and provides only a pulse laser having a predetermined polarizing angle; a polarization characteristic adjusting unit which divides the pulse laser provided by the pulse laser providing unit into S-polarizing component light and P-polarizing component light, varies the phase difference and amplitude difference between the S-polarizing component light and the P-polarizing component light, and combines the two types of light to generate a pulse laser with varied polarization characteristics; and a pulse compression unit which compresses the pulse width of the pulse laser, the polarization characteristics of which are varied by the polarization characteristic adjusting unit, and outputs the pulse laser.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: May 6, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Nam-Soo Myung, Seung-Hwan Kim
  • Patent number: 8693510
    Abstract: An optical transmitter includes a laser configured to emit light, a power of the light increasing with temperature decreasing, a Faraday rotator configured to rotate a polarization direction of the light in accordance with the temperature, and a first polarizer that has a principal axis inclined at a given angle and inputs the light output from the Faraday rotator.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: April 8, 2014
    Assignee: Fujitsu Optical Components Limited
    Inventor: Manabu Komiyama
  • Patent number: 8682113
    Abstract: An electro-optic waveguide polarization modulator includes cladding layers, and a waveguide core sandwiched between the cladding layers, wherein the waveguide core has a higher refractive index than the cladding layers. The modulator further includes primary electrodes arranged on the opposite side of one cladding layer to the core and a secondary electrode arranged on the opposite side of another cladding layer to the core. The electrodes are arranged to provide an electric field having field components in perpendicular directions within the waveguide core so as to modulate the refractive index such that electromagnetic radiation propagating through the core is converted from a first polarization state to a second polarization state. The modulator further includes a grading layer sandwiched between the cladding layers and the core, the grading layer having an effective refractive index intermediate between that of the waveguide core and the cladding layer.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: March 25, 2014
    Assignee: U2T Photonics UK Limited
    Inventor: John Heaton
  • Publication number: 20140056321
    Abstract: An optical amplifier receives a seed laser having a wavelength of 1064 nm. Amplification occurs in a segmented Nd:YVO4 gain medium pumped with a pump source. Each segment of the gain medium has a length and dopant concentration and together the segments enhance power absorption in the gain medium enabling use of a higher power end pump which increases pulse energy and average power of the laser. The first end of the gain medium includes a wedge surface which arranges a quad-pass optical amplifier to achieve high extraction efficiency.
    Type: Application
    Filed: August 22, 2012
    Publication date: February 27, 2014
    Inventor: XIAOYUAN PENG
  • Publication number: 20140050239
    Abstract: A degree of polarization control device includes: a calcium fluoride crystal substrate for transmitting a laser beam; a polarization monitor for measuring the degree of polarization of a laser beam transmitted through the calcium fluoride crystal substrate; and a controller for controlling the rotation angle of the calcium fluoride crystal substrate according to the degree of polarization measured by the polarization monitor; the calcium fluoride crystal substrate being formed by a flat plate having a laser beam entering surface and a laser beam exiting surface running in parallel with the (111) crystal face, the Brewster angle being selected for the incident angle, the rotation angle around the [111] axis operating as a central axis being controlled by the controller.
    Type: Application
    Filed: July 22, 2013
    Publication date: February 20, 2014
    Applicant: GIGAPHOTON INC.
    Inventors: Shinji NAGAI, Fumika YOSHIDA, Osamu WAKABAYASHI, Kouji KAKIZAKI
  • Patent number: 8654802
    Abstract: A vertical-cavity surface-emitting laser array includes a substrate having an element forming area, multiple columnar structures formed in the element forming area on the substrate, and at least one metal wire formed adjacent to the multiple columnar structures. Each columnar structure includes a lower semiconductor reflector of a first conductivity type, an upper semiconductor reflector of a second conductivity type, and an active region formed between the lower semiconductor reflector and the upper semiconductor reflector. The columnar structure emits light in a direction perpendicular to the substrate. The at least one metal wire has a distortion applying segment that extends in the same direction relative to the multiple columnar structures.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: February 18, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Masaya Kumei
  • Publication number: 20140036943
    Abstract: A patterned retarder is described that may be used with a laser source array to obtain a combined beam suitable for three-dimensional laser image projection using orthogonal polarization states and/or orthogonal color spaces.
    Type: Application
    Filed: March 15, 2013
    Publication date: February 6, 2014
    Inventors: Peter Janssens, Koenraad Vermeirsch
  • Patent number: 8629446
    Abstract: Materials, methods, structures and device including the same can provide a semiconductor device such as an LED using an active region corresponding to a non-polar face or surface of III-V semiconductor crystalline material. In some embodiments, an active diode region contains more non-polar III-V material oriented to a non-polar plane than III-V material oriented to a polar plane. In other embodiments, a bottom region contains more non-polar m-plane or a-plane surface area GaN than polar c-plane surface area GaN facing an active region.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: January 14, 2014
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventor: Anthony J. Lochtefeld
  • Patent number: 8582611
    Abstract: In a frequency-tripled fiber-MOPA, a pre-amplified plane-polarized seed-pulse having a fundamental frequency is divided into two pulse-components, plane-polarized in polarization-orientations at 90-degrees to each other. The fundamental-wavelength pulse-components are amplified in a common amplifier-fiber. The amplified components are separately propagated on different optical paths. One of the amplified components is frequency-doubled. The frequency-doubled component on one path and fundamental-frequency component on the other path are then combined on a common-path and sum-frequency mixed to provide a frequency-tripled pulse.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: November 12, 2013
    Assignee: Coherent, Inc.
    Inventor: Andrei Starodoumov
  • Publication number: 20130266034
    Abstract: laser devices described may emit a beam of electromagnetic radiation having a large wavelength (e.g., mid-infrared, far-infrared) and exhibiting a low angle of divergence. In some embodiments, the wavelength of the electromagnetic radiation is between 3 microns and 500 microns and the divergence angel is less than 15 degrees. Electromagnetic waves may be produced from a single monolithic laser device which includes a laser waveguide (e.g., quantum cascade laser waveguide) and a collimating element having at least one indented region (e.g., a plurality of periodically disposed grooved structures). A portion of the electromagnetic radiation may propagate as surface waves (e.g., surface plasmons) along the surface of the collimating element where indented regions in the collimating element may decrease the propagation velocity of the surface waves. A portion of the electromagnetic radiation may also be substantially convinced within a grooved structure of the collimating element (e.g., as channel polaritons).
    Type: Application
    Filed: May 6, 2011
    Publication date: October 10, 2013
    Applicant: President and Fellows of Harvard College
    Inventors: Nanfang Yu, Federico Capasso
  • Publication number: 20130243016
    Abstract: A laser anti-reflection device includes a polarizing beam splitter, a ?/4 wave plate and an absorber disposed in an outgoing light path of a laser emitting linearly polarized light with a wavelength of ?. The linearly polarized light from the laser passes through the polarizing beam splitter and the ?/4 wave plate in turn to become a circularly polarized light beam. Part of the circularly polarized light beam is then reflected by a workpiece to be processed along the original light path and passes the ?/4 wave plate to become a linearly polarized light beam with a polarization direction vertical to that of the outgoing linearly polarized light beam. The vertical polarized beam passes the polarizing beam splitter, deviates from the light path of the outgoing linearly polarized light beam and reaches the absorber. The laser anti-reflection device prevents reflected light from damaging the laser from high power lasers.
    Type: Application
    Filed: November 26, 2011
    Publication date: September 19, 2013
    Applicant: BEIJING LUHE FEIHONG LASER S&T CO., LTD.
    Inventors: Zhiyong Wang, Wenbin Qin, Yinhua Cao, Jingjing Dai, Tingwu Ge
  • Publication number: 20130208742
    Abstract: An optical device may include: an optical module disposed in a beam delivery path of a laser beam; a beam adjusting unit disposed in the beam delivery path for adjusting the beam delivery path of the laser beam; a measuring unit disposed in the beam delivery path for detecting the beam delivery path; and a control unit for controlling the beam adjusting unit based on a detection result of the beam delivery path of the laser beam detected by the measuring unit.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 15, 2013
    Applicant: GIGAPHOTON INC.
    Inventors: Hakaru Mizoguchi, Takashi Suganuma, Hideo Hoshino, Osamu Wakabayashi
  • Patent number: 8503499
    Abstract: A gas discharge chamber that uses a calcium fluoride crystal which reduces a breakage due to mechanical stress (window holder and laser gas pressure), thermal stress from light absorption, and the like, increases the degree of linear polarization of output laser, and suppresses degradation due to strong ultraviolet (ArF, in particular) laser light irradiation. A first window (2) and a second window (3) of the gas discharge chamber have an incident plane and an emitting plane in parallel with a (111) crystal plane of their calcium fluoride crystal. With respect to an arrangement where laser light entering the calcium fluoride crystal passes through a plane including a <111> axis and a <001> axis of each of the first window (2) and the second window (3) as seen from inside the chamber (1), the first window (2) and the second window (3) are arranged in positions rotated in the same direction by the same angle about their <111> axis.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: August 6, 2013
    Assignee: Gigaphoton Inc.
    Inventors: Shinji Nagai, Fumika Yoshida, Osamu Wakabayashi, Kouji Kakizaki
  • Patent number: 8446924
    Abstract: In the case of a lens array type homogenizer optical system, the incident angle and intensity of a laser beam 1 entering a large-sized lens (long-axis condenser lens 22) of a long-axis condensing optical system, which is provided on the rear side, are changed for every shot by performing laser irradiation while long-axis lens arrays 20a and 20b are reciprocated in a direction corresponding to a long axial direction of a linear beam (X-direction). Therefore, vertical stripes are significantly reduced. Further, the incident angle and intensity of a laser beam 1 entering a large-sized lens (projection lens 30) of a short-axis condensing optical system, which is provided on the rear side, are changed for every shot by performing laser irradiation while short-axis lens arrays 26a and 26b are reciprocated in a direction corresponding to a short axial direction of a linear beam (Y-direction). Therefore, horizontal stripes are significantly reduced.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: May 21, 2013
    Assignee: IHI Corporation
    Inventors: Norihito Kawaguchi, Ryusuke Kawakami, Kenichiro Nishida, Miyuki Masaki, Masaru Morita
  • Publication number: 20130094529
    Abstract: A laser apparatus for generating extreme ultraviolet (EUV) light at a wavelength of approximately 13 nm is provided. The laser apparatus may be combined with a reduced projection reflective optical system. Systems and methods for generating EUV light are also provided.
    Type: Application
    Filed: March 8, 2012
    Publication date: April 18, 2013
    Applicant: GIGAPHOTON INC.
    Inventor: Osamu Wakabayashi
  • Publication number: 20130064256
    Abstract: In at least one embodiment a laser system includes a fiber laser source, a polarization controller and a wavelength converter. The relative power distribution between a pump wavelength and a signal wavelength is controllable using the polarization controller. An optional phase compensator is used to control polarization state of the output laser beam. In various embodiments the relative power distribution among multiple wavelengths may be controlled over a range of at least about 100:1.
    Type: Application
    Filed: September 12, 2012
    Publication date: March 14, 2013
    Applicant: IMRA AMERICA, INC.
    Inventors: Jingzhou XU, Gyu Cheon CHO
  • Patent number: 8374206
    Abstract: Two pulsed lasers (14) or sets of lasers propagate beams of pulses (20) having orthogonally related polarization states. A beam combiner (24) combines the orthogonal beams to form a combined beam propagating along a common beam path (16) to intersect an optical modulator (30) that selectively changes the polarization state of selected pulses of either beam to provide a composite beam (18) including similarly polarized pulses from the orthogonal beams. The composite polarized beam has a composite average power and a composite repetition rate that are greater than those provided by either laser. The optical modulator can also selectively control the polarization states of pulses from either laser to pass through or be blocked by a downstream polarizer (32). Additional modulators may facilitate pulse shaping of the pulses. The system is scalable by addition of sets of single lasers or pairs of lasers with beam combiners and modulators.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: February 12, 2013
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Xiaoyuan Peng, William J. Jordens
  • Publication number: 20130034116
    Abstract: An EUV light generation system includes a driver laser comprising a master oscillator such as a semiconductor laser, a spatial filter, gas slab amplification devices, relay optical systems, and high-speed axial-flow amplifiers. The slab amplification devices include beam adjusting optical units disposed, respectively, at input and output sides of the slab amplifiers SA to convert the beam profile and/or polarization direction and/or an elongated direction of the beam profile with the slab amplifiers is parallel to a free space axis AF of the slab waveguides, i.e. parallel to the discharge electrodes.
    Type: Application
    Filed: November 10, 2011
    Publication date: February 7, 2013
    Applicant: GIGAPHOTON INC.
    Inventors: Krzysztof Nowak, Takashi Suganuma, Osamu Wakabayashi
  • Publication number: 20120307851
    Abstract: A system includes a chamber, a laser beam apparatus configured to generate a laser beam to be introduced into the chamber, a laser controller for the laser beam apparatus to control at least a beam intensity and an output timing of the laser beam, and a target supply unit configured to supply a target material into the chamber, the target material being irradiated with the laser beam for generating extreme ultraviolet light.
    Type: Application
    Filed: August 10, 2012
    Publication date: December 6, 2012
    Inventors: Tsukasa HORI, Kouji KAKIZAKI, Tatsuya YANAGIDA, Osamu WAKABAYASHI, Hakaru MIZOGUCHI