Pump Cavity Patents (Class 372/72)
  • Patent number: 10058250
    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: March 9, 2017
    Date of Patent: August 28, 2018
    Assignee: The General Hospital Corporation
    Inventors: Benjamin Vakoc, Meena Siddiqui, Serhat Tozburun
  • Patent number: 9525262
    Abstract: A slab laser and its method of use for high power applications including the manufacture of semiconductors and deposition of diamond and/or diamond-like-carbon layers, among other materials. A lamp driven slab design with a face-to-face beam propagation scheme and an end reflection that redirects the amplified radiation back out the same input surface is utilized. A side-to-side amplifier configuration permitting very high average and peak powers having scalability is also disclosed. Cavity filters adjacent to pump lamps convert the normally unusable UV portion of the pump lamp spectrum into light in the absorption band of the slab laser, thereby increasing the overall pump efficiency. The angle of the end reflecting surface is changed to cause the exit beam to be at a different angle than the inlet beam, thereby eliminating the costly need to separate the beams external to the laser with the subsequent loss of power.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: December 20, 2016
    Inventors: Martin A. Stuart, Stephen L. Cunningham
  • Patent number: 9368931
    Abstract: A monolithic, side pumped solid-state laser (1) comprising a laser resonator structure (3) comprised of a laser gain medium (2) having a longitudinal axis (L), wherein the laser resonator structure (3) comprises end faces (4) forming a linear optical path resonant cavity there between, at least one of the end faces (4) comprising at least partially reflecting laser mirrors (4a, 4b) in particular deposited thereon, the laser gain medium (2) comprising a side face (2a) for receiving pump light (5a) of a pump source (5), wherein the pump light (5a) is generated by a diode laser (5), and comprising a conductive cooler (6) comprising contact faces (6c) contacting the laser gain medium (2), and comprising a reflector (7) arranged opposite to the side face (2a) with respect to the longitudinal axis (L), wherein the laser gain medium (2) is a low gain material.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: June 14, 2016
    Assignee: Pantec Biosolutions AG
    Inventors: Thomas Bragagna, Arne Heinrich
  • Patent number: 9306701
    Abstract: A system is disclosed to identify authorized EO devices and unauthorized EO devices within a scene. The system hampers the operation of the unauthorized EO devices detected within the scene.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: April 5, 2016
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Timothy Bradley
  • Patent number: 9246299
    Abstract: An economical slab laser for high power applications. The laser is a lamp driven slab design with face-to-face beam propagation and an end reflection that redirects the amplified radiation back out the input surface. Also presented is a side-to-side larger amplifier configuration, permitting very high average and peak powers due to the electrical efficiency of converting and getting energy into the crystal, optical extraction efficiency, and scalability of device architecture. Cavity filters adjacent to pump lamps convert the unusable UV portion of the pump lamp spectrum into light in the absorption band of the slab laser thereby increasing the overall pump efficiency. The angle of the end reflecting surface is changed to cause the exit beam to be at a different angle than the inlet beam, thereby eliminating the need to separate the beams external to the laser with the subsequent loss of power.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: January 26, 2016
    Inventors: Martin A. Stuart, Stephen L. Cunningham
  • Patent number: 9180032
    Abstract: A system and method for processing a tubular member comprises a hollow tubular member, a laser and a media flow. The laser is constructed and arranged to transmit laser energy to the tubular member. The laser energy is transmitted to the tubular member through a fluid column according to a predetermined pattern. The media flow is injected into the lumen of the hollow tubular member.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: November 10, 2015
    Assignee: BOSTON SCIENTIFIC SCIMED, INC.
    Inventors: Kenneth M. Merdan, Jan Weber
  • Patent number: 9036667
    Abstract: A high power fiber laser system emitting a substantially diffraction limited beam with a Gaussian intensity profile includes a single mode (“SM”) neodymium fiber pump source outputting a SM pump light; a seed laser operative to emit a SM signal light at a wavelength greater than that of the pump light; a SM DWM receiving and multiplexing the SM pump and signal lights. The disclosed system further includes a booster fiber amplifier which is configured with a frustoconically-shaped ytterbium (“Yb”) doped core receiving the pump and signal lights and configured with a small diameter input end which supports only a SM and a large diameter output end which is capable of supporting the SM and high order modes (:HOM”). The booster further has a cladding surrounding and coextending with the core, the core being configured for having intensity profiles of respective SMs of pump and signal lights overlap one another so that an overlap integral substantially equals to one (1) along an entire length of the core.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: May 19, 2015
    Assignee: IPG Photonics Corporation
    Inventors: Valentin Gapontsev, Igor Samartsev
  • Patent number: 9036677
    Abstract: An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: May 19, 2015
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Andrew James Bayramian, Kenneth R. Manes, Robert Deri, Alvin Erlandson, John Caird, Mary L. Spaeth
  • Patent number: 9008145
    Abstract: An edge-emitting semiconductor component, comprising a semiconductor substrate layer and epitaxially on-grown semiconductor layers, is disclosed. According to the invention an active zone of the semiconductor layers is designed to absorb pumped optical radiation of a first wavelength by multi-photon absorption and generate an optical radiation of a second wavelength that is shorter than the first wavelength. A step of multiplying the first wavelength of the pumped optical radiation to a second harmonic using a nonlinear crystal is advantageously made redundant. Furthermore, a system for frequency conversion is disclosed, comprising the semiconductor component, a pump laser diode designed to generate the pumped optical radiation and methods for manufacturing the semiconductor component and operating the system for frequency conversion.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: April 14, 2015
    Assignee: Forschungsverbund Berlin e.V.
    Inventors: Markus Weyers, Götz Erbert
  • Patent number: 8928971
    Abstract: A high-power optical fiber laser includes: an oscillator (1); a pumping laser (5) able to emit a high-power pumping optical radiation beam; and a signal-amplifying optical fiber (3) able to receive the optical source signal and the high-power pumping optical radiation beam so as to generate a high-power laser beam. The pumping laser includes a plurality of pumping multimode laser diodes (7a-7f) and a laser cavity, the laser cavity including a double-clad fiber (4) including: a neodymium-doped monomode waveguide; a fiber Bragg grating (9) forming one end of the laser cavity; and a fiber reflector (11) forming the other end of the laser cavity, the monomodefiber laser being able to generate a laser radiation beam when it is optically pumped by a pumping radiation beam originating from the plurality of pumping laser diodes in order for the laser cavity to emit a high-power pumping laser radiation beam.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: January 6, 2015
    Assignees: IXFIBER, Centre National de la Recherche Scientifique
    Inventors: Mathieu Laroche, Herve Gilles, Sylvain Girard, Thierry Robin, Benoit Cadier
  • Patent number: 8929415
    Abstract: Photonic crystal cavities and related devices and methods are described. The described cavities can be used as lasers, photovoltaic sources, and single photon sources. The cavities can be both optically and electrically pumped. A fabrication process of the cavities is also described.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: January 6, 2015
    Assignee: California Institute of Technology
    Inventors: Seheon Kim, Axel Scherer
  • Patent number: 8891563
    Abstract: A two-chip OPS laser includes first and second OPS-chips each emitting the same fundamental wavelength in first and second resonators. The first and second resonators are interferometrically combined on a common path terminated by a common end-mirror. The interferometric combination provides for automatic wavelength-locking of the laser, which can eliminate the need for a separate wavelength selective device in the laser.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: November 18, 2014
    Assignee: Coherent, Inc.
    Inventor: Qi-Ze Shu
  • Patent number: 8885676
    Abstract: Laser devices are presented in which a graphene saturable absorber and an optical amplifier are disposed in a resonant optical cavity with an optical or electrical pump providing energy to the optical amplifier.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: November 11, 2014
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Francis J. Kub, Marc Currie
  • Patent number: 8867576
    Abstract: A laser system having a cavity formed by at least two sub-cavities and a mechanism for optically pumping a first of the at least two sub-cavities. In the system, the optical pumping mechanism is arranged in such away to not reach a laser emission threshold of the first sub-cavity, the first sub-cavity (2) comprising a device for generating a short pulse, a second sub-cavity (3) comprising an external triggering device. The first and second sub-cavities are coupled such that the triggering of the second sub-cavity has at least two such laser systems, to a light emission system with a wide spectral band, comprising such a laser system and a mechanism for generating non-linear optical effects inserted into the second sub-cavity, and to a light generator with a wide spectral band, comprising such a laser generator having at least one laser system provided with a mechanism for generating non-linear optical effects inserted into the second sub-cavity.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: October 21, 2014
    Assignees: Centre National de la Recherche Scientifique-CNRS, Compagnie Industrielle des Lasers Cilas (CILAS)
    Inventors: Vincent Couderc, Philippe Paul Leproux, Florent Doutre, Dominique Pagnoux
  • Patent number: 8824518
    Abstract: A the vertical-cavity surface-emitting laser includes a stripe-shaped active medium (10) having an emission maximum at a first wavelength (?1), wherein a first reflector (18) is arranged below the stripe-shaped active medium (10) and a second reflector (20) is arranged above the stripe-shaped active medium (10), with the first reflector (18) facing the second reflector (20), wherein the first reflector (18) and a second reflector (20) have a reflectivity maximum in the region of the first wavelength (?1), wherein a third reflector (12) and a fourth reflector (13) are each arranged on a side above or next to the stripe-shaped active medium (10), wherein the third reflector (12) faces the fourth reflector (13), and wherein the third reflector (12) and the fourth reflector (13) have a reflectivity maximum in the region of a second wavelength (?2), wherein the first wavelength (?1) is greater than the second wavelength (?2).
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: September 2, 2014
    Assignee: Forschungsverbund Berlin e.V.
    Inventors: Günther Tränkle, Joachim Piprek, Hans Wenzel, Götz Erbert, Markus Weyers, Andrea Knigge
  • Patent number: 8804779
    Abstract: A system, apparatus, and method may provide laser beams of two or more wavelengths from diode pumped solid-state laser sources (220, 222, 224). The beam paths of these laser beams with different wavelengths, which are generated by the laser sources (220, 222, 224), may be aligned along a common optical axis 280 by an optical configuration, to treat at least one target area. Frequency-doubled laser beams, output from a plurality of diode pumped solid state laser cavities, may be passed through fold mirrors (M2, M5, M8), and combined on a common optical axis 280, using one or more combiner mirrors (M10, M11, M12), to unify the beam paths. Selected laser beams may be delivered to a target using one or more delivery systems.
    Type: Grant
    Filed: May 4, 2010
    Date of Patent: August 12, 2014
    Assignee: Lumenis Ltd.
    Inventors: David Haydn Mordaunt, Steven Scott Christensen, Allison Albrecht Ferro, David A. Dewey
  • Patent number: 8786840
    Abstract: A method and device for remotely monitoring an area using a low peak power optical pump comprising one or more pumping sources, one or more lasers; and an optical response analyzer. Each pumping source creates a pumping energy. The lasers each comprise a high reflectivity mirror, a laser media, an output coupler, and an output lens. Each laser media is made of a material that emits a lasing power when exposed to pumping energy. Each laser media is optically connected to and positioned between a corresponding high reflectivity mirror and output coupler along a pumping axis. Each output coupler is optically connected to a corresponding output lens along the pumping axis. The high reflectivity mirror of each laser is optically connected to an optical pumping source from the one or more optical pumping sources via an optical connection comprising one or more first optical fibers.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: July 22, 2014
    Assignee: U.S. Department of Energy
    Inventors: Steven D. Woodruff, Dustin L. Mcintyre, Jinesh C. Jain
  • Patent number: 8761223
    Abstract: A large number of passes of pump light through an active mirror in a solid state disk laser is realized using a pair of coupled imaging systems, where the optical axes of imaging systems are not coincident. Two imaging systems are optically coupled, so that an image of the first imaging system is an object of the second imaging system, and vice versa. An active mirror is disposed at the object or image plane, or at the focal plane of any one of the coupled imaging systems, where the position of the reflected pump beam during the multi-reflection between the first and second imaging systems is substantially unchanged.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: June 24, 2014
    Assignee: Optton Co. Ltd.
    Inventors: Zhijiang Wang, Ying Wang
  • Patent number: 8750344
    Abstract: In a laser pump arrangement for a laser medium that amplifies a laser beam, comprising at least one laser pump source (1?) with a plurality of emitters for generating partial pumping streams (TPS1?, TPS2?), the partial pumping streams (TPS1?, TPS2?) are led through a coupling optic to a homogenizer (3?) and then are thoroughly mixed in one axis through multiple reflections. In the process, the homogenizer (3?) and the laser medium are designed and disposed such that the pump stream exiting the homogenizer (3?) is led directly onto or into the laser medium while maintaining divergence in the mixing axis (DA), wherein the partial pumping streams (TPS1?, TPS2?) are projected, in particular focused, directly onto or into the laser medium in a projection axis (PA) that is perpendicular to the mixing axis (DA).
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: June 10, 2014
    Assignee: High Q Laser GmbH
    Inventors: Daniel Kopf, Maximilian Lederer
  • Patent number: 8687659
    Abstract: A system (100) for generating a millimeter wave signals from heterodyning wavelengths from a multi-wavelength signal generated by a Brillouin-Erbium fiber laser (101). The Brillouin-Erbium fiber laser (101) includes a source laser (105) that transmits a seed signal. An optical directional coupler (110) has a first input that receives the seed signal from the source laser and a first output. An Erbium doped fiber amplifier (115) has an input connected to the first output of the optical directional coupler and an output. The Erbium doped fiber amplifier amplifies the seed signal. A four port circulator (120) has a first port that receives the seed signal from the Erbium doped fiber amplifier. A Brillouin gain medium (135) is connected to a second port and a third port of the circulator.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: April 1, 2014
    Assignee: Telekom Malaysia Berhad
    Inventors: Asmahanim bte Ahmad, Mohamed Razman bin Yahya, Syamsuri bin Yaakob, Mohd Adzir Mahdi, Romli Mohamad, Abdullah bin Man, Muhammad Zamsuri bin Abdul Kadir, Yu Gang Shee
  • Publication number: 20140044143
    Abstract: A laser device comprising a pump source (10) operable to generate a pump beam (11) for a resonant cavity in which a laser medium (74) is arranged. A beam-shaping waveguide element (18) is arranged between the pump source and the resonant cavity. Shaping of the pump beam is achieved by tailoring the refractive index profile of the waveguide element (18) so that it yields an intensity distribution which spatially overlaps a desired ring-shaped Laguerre-Gaussian mode of the resonant cavity sufficiently well to achieve laser oscillation on said desired Laguerre-Gaussian mode. A ring-shaped or doughnut-shaped laser beam profile can thus be generated. It is further possible to design the refractive index profile (76) so that the pump beam's intensity distribution also spatially overlaps the fundamental mode of the resonant cavity sufficiently well to achieve laser oscillation also on said fundamental mode. The laser will then lase on both the fundamental mode and the selected Laguerre-Gaussian mode.
    Type: Application
    Filed: April 20, 2012
    Publication date: February 13, 2014
    Inventors: William Andrew Clarkson, Ji Won Kim, Jacob Isa Mackenzie
  • Patent number: 8649403
    Abstract: When an output instruction is input to a control unit, the control unit controls a seed laser light source and a pumping light source to be either in a pre-pumped state or in an output state. In the pre-pumped state, the pumping light source outputs, for a predetermined period, pumping light with an intensity determined based on the duration of the period of time from when the output state prior to the input of the output instruction to the control unit comes to an end till when the output instruction is input to the control unit. In the output state, to cause the output unit to output laser light, the seed laser light source outputs laser light, and the pumping light source outputs pumping light.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: February 11, 2014
    Assignee: Fujikura Ltd.
    Inventors: Yasuhiro Oba, Michihiro Nakai
  • Patent number: 8594147
    Abstract: A diode pumped solid-state laser for high shock, high vibration environments such as those found in laser ignition systems for artillery systems which internally integrate into the breech of an artillery system such as a 155 mm howitzer. The diode pumped solid-state laser employs a unique gain medium mounting which permits its use in such high shock/high vibration environments. Contributing further to robustness is a monolithic design based on diode arrays mounted in a linear configuration along with an advanced polycrystalline gain medium laser rod. Advantageously, and in sharp contrast to laser ignition systems incorporating flash lamps, the diode pumped solid-state laser of the present invention permits a seamless integration into a howitzer artillery weapons system without other complex mounting provisions or shock isolation system(s).
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: November 26, 2013
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Gregory Burke, Luke Helsel, Thomas DeVoe, Jacqueline Quinn Baeder, David Bound
  • Patent number: 8588268
    Abstract: A high power source of electro-magnetic radiation having a multi-purpose housing is disclosed. The multi-purpose housing includes an interior filled with a material forming at least a light source and further comprising a reflector which can envelope a laser rod surrounded by light sources for providing light excitation to the laser rod. A material defining outer surfaces of the light sources extends out to and defines outer surfaces of the reflector. A high-reflectivity coating is disposed over an outer surface of the reflector, as is a protective coating. Also disposed over an outer surface of the reflector can be an optional heat sink, with cooling being performed by an optional arrangement of forced-air traveling over the heat sink. The light sources may be light source pumps, and the high-reflectivity coating may be formed to envelop the reflector.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: November 19, 2013
    Assignee: Biolase, Inc.
    Inventors: Dmitri Boutoussov, Vladimir S. Netchitailo
  • Patent number: 8576885
    Abstract: Optical pump modules using VCSEL arrays are provided to pump optical gain media for achieving high power laser output in CW, QCW and pulse operation modes for operation. Low divergence and symmetric far-field emission from VCSELs are particularly suitable for compact arrays. VCSEL arrays configured as laser pump modules are operable at high temperatures with practically no degradation over a long period of time. VCSEL pump modules are adaptable for side- or end-pumping configurations to pump high power lasers in CW, QCW and pulse mode. Power output from VCSEL pump modules is scalable. Incorporating microlens arrays with the VCSEL arrays improve brightness of the pump modules. High power and high temperature operation of VCSEL modules make it suitable for making compact high power solid state lasers that are operable in small spaces such as, ignition of internal combustion engines, stationary power generation engines and pulsed detonation engines.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: November 5, 2013
    Assignee: Princeton Optronics, Inc.
    Inventors: Robert van Leeuwen, Yihan Xiong, Jean F Seurin, Chuni L Ghosh, Bing Xu
  • Publication number: 20130272336
    Abstract: An optical gain architecture includes a pump source and a pump aperture. The architecture also includes a gain region including a gain element operable to amplify light at a laser wavelength. The gain region is characterized by a first side intersecting an optical path, a second side opposing the first side, a third side adjacent the first and second sides, and a fourth side opposing the third side. The architecture further includes a dichroic section disposed between the pump aperture and the first side of the gain region. The dichroic section is characterized by low reflectance at a pump wavelength and high reflectance at the laser wavelength. The architecture additionally includes a first cladding section proximate to the third side of the gain region and a second cladding section proximate to the fourth side of the gain region.
    Type: Application
    Filed: June 5, 2013
    Publication date: October 17, 2013
    Inventors: Andrew James Bayramian, Kenneth R. Manes, Robert Deri, Alvin Erlandson, John Caird, Mary L. Spaeth
  • Patent number: 8514906
    Abstract: A compact laser in accordance with an exemplary embodiment in the present disclosure includes a compact resonator structure using a non-planar resonator geometry of bulk components. The laser further includes a laser gain medium and a pump source integrated within an optical path of the resonator. Some embodiments contain modifications to the resonator structure for integration of the laser gain medium, for controlling the output from the laser, and/or for controlling the physical and operational parameters of the laser. Some embodiments contain modifications to the laser gain medium or other bulk components of the resonator to integrate these bulk components within the resonator structure.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: August 20, 2013
    Inventor: James Thomas Murray
  • Publication number: 20130208753
    Abstract: Optical pump modules using VCSEL arrays are provided to pump optical gain media for achieving high power laser output in CW, QCW and pulse operation modes for operation. Low divergence and symmetric far-field emission from VCSELs are particularly suitable for compact arrays. VCSEL arrays configured as laser pump modules are operable at high temperatures with practically no degradation over a long period of time. VCSEL pump modules are adaptable for side- or end-pumping configurations to pump high power lasers in CW, QCW and pulse mode. Power output from VCSEL pump modules is scalable. Incorporating microlens arrays with the VCSEL arrays improve brightness of the pump modules. High power and high temperature operation of VCSEL modules make it suitable for making compact high power solid state lasers that are operable in small spaces such as, ignition of internal combustion engines, stationary power generation engines and pulsed detonation engines.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 15, 2013
    Applicant: PRINCETON OPTRONICS
    Inventors: R. van Leeuwen, Bing Xu, J-F Seurin, Chuni Lal Ghosh, Yihan Xiong
  • Publication number: 20130156062
    Abstract: It is provided a wavelength converting device oscillating an idler light having a wavelength of 5 to 10 ?m from a pump light. The wavelength of the idler light is longer than that of the pump light. The wavelength converting device includes a wavelength converting layer 5 of a semiconductor non-linear optical crystal and having a thickness of 50 ?m or smaller. The wavelength converting layer 5 includes a crystal orientation inversion structure wherein crystal orientation of the optical crystal is inverted at a predetermined period and at least one flat main face 5b. The device further includes a Peltier device 2 controlling a temperature of the wavelength converting layer 5; and a clad portion 4 joined with the flat main face 5b of the wavelength converting layer 5 and provided between the wavelength converting layer 5 and the Peltier device 2. The pump light, idler light and signal light satisfies a particular phase matching condition.
    Type: Application
    Filed: December 13, 2012
    Publication date: June 20, 2013
    Applicant: NGK INSULATORS, LTD.
    Inventor: NGK INSULATORS, LTD.
  • Patent number: 8467429
    Abstract: A laser comprises an end pump light source and a gain medium having a first end, a second end, and four sides comprising a first, a second, a third, and a fourth side. The end pump light source is optically coupled to the first end and pumps the gain medium. The first side and the third side are tapered inwardly from the first end to the first end to the second end at a taper angle ? relative to a longitudinal lasing axis and have a polished finish capable of reflecting light inside the gain medium. The second side and the fourth side are substantially parallel to the longitudinal lasing axis have a ground blasted finish. The first side is also tilted inwardly at a slant angle ? from the fourth side to the second side. A laser beam R0 exits the second end of the gain medium.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: June 18, 2013
    Assignee: Innova, Inc.
    Inventor: M. Cem Gokay
  • Patent number: 8315284
    Abstract: A laser device with frequency conversion, the device comprising a complex optical cavity comprising two cavity parts with two different levels of circulating intracavity power wherein there is placed at least one non-linear crystal (30) is placed within the cavity part of higher circulating power and an active medium (21) in the cavity part of lower circulating power, the power enhancement achieved in two steps and the total enhancement being the product of the enhancement factors in each step, providing additional freedom in design allowing both the condition for high enhancement of the interacting laser power inside the intracavity non-linear crystal and the condition for maximum power output from the laser to be satisfied simultaneously and wherein said complex optical cavity the first cavity part provides the initial step of power enhancement and comprises at least a laser cavity back mirror (20), highly reflective about a laser radiation fundamental frequency .omega., and an active (gain) medium.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: November 20, 2012
    Inventor: Fedor V. Karpushko
  • Patent number: 8315288
    Abstract: To reduce the laser threshold by efficiently exciting a light-emitting body in a solid-state dye laser with light having high density, thereby facilitating emission of laser beams, and to miniaturize a solid-state dye laser including an excitation light source. A solid-state dye laser capable of emitting laser beams by efficiently introducing light from an excitation light source to a light-emitting body incorporated in an optical resonator structure and exciting the light-emitting body with light with high density, is realized.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: November 20, 2012
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Mikio Yukawa, Tetsuo Tsutsui
  • Patent number: 8315289
    Abstract: An optical apparatus comprising a gain medium exhibiting polarisation dependent absorption along two axes, the gain medium having a weakly absorbing axis and a strongly absorbing axis, an optical pump source arranged to direct pump light towards a first face of the gain medium such that the pump light entering the gain medium has a component of its polarisation parallel to the weakly absorbing axis, a polarisation modifying apparatus and one or more reflectors which are together arranged to modify the polarisation of pump light which exits the gain medium through a second face of the gain medium, and to direct the pump light with modified polarisation back towards said second face of the gain medium.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: November 20, 2012
    Assignee: Laser Quantum Limited
    Inventors: Alan M. Cox, Jean-Charles Cotteverte
  • Patent number: 8287131
    Abstract: A wavelength conversion laser is provided with a solid-state laser having a cavity, and a wavelength converting element arranged within the cavity. The solid-state laser includes two or more types of laser crystals and oscillates solid-state laser light of multiple wavelengths. The wavelength converting element converts the solid-state laser light of multiple wavelengths into light of second harmonic waves and sum-frequency wave of multiple wavelengths and simultaneously generates the second harmonic waves and sum-frequency wave of multiple wavelengths. The wavelength conversion laser outputs converted wavelength light having a broad spectral width and low coherency, thereby enabling it to carry out highly efficient and stable high-output oscillation.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: October 16, 2012
    Assignee: Panasonic Corporation
    Inventors: Tetsuro Mizushima, Toshifumi Yokoyama, Tatsuo Itoh, Kenji Nakayama, Kiminori Mizuuchi, Kazuhisa Yamamoto
  • Patent number: 8275015
    Abstract: Disclosed herein are systems and methods for generating a side-pumped passively Q-switched non-planar ring oscillator. The method introduces a laser into a cavity of a crystal, the cavity having a round-trip path formed by a reflection at a dielectrically coated front surface, a first internal reflection at a first side surface of the crystal at a non-orthogonal angle with the front, a second internal reflection at a top surface of the crystal, and a third internal reflection at a second side surface of the crystal at a non-orthogonal angle with the front. The method side pumps the laser at the top or bottom surface with a side pump diode array beam and generates an output laser emanating at a location on the front surface. The design can include additional internal reflections to increase interaction with the side pump. Waste heat may be removed by mounting the crystal to a heatsink.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: September 25, 2012
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Steven X. Li
  • Patent number: 8270443
    Abstract: A side-pumped, diode-pumped solid-state laser cavity includes a conductively cooled housing having an opening for pump radiation from a diode array in close proximity to a laser rod. The pump light is absorbed by the rod and excites the laser ions. The cavity includes a thin, diffuse reflector encircling the rod, having a shaped opening for the collection and redirection of the pump light into the rod, and a good heat conductor as the heat sink and heat conductor. A split heat sink inhibits the flow of heat from the pump diodes into the laser rod, and pre-formed air spacings are designed to provide uniform temperature distribution around the laser rod.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: September 18, 2012
    Assignee: Israel Aerospace Industries Ltd.
    Inventors: Ram Oron, Doron Nevo, Moshe Oron
  • Patent number: 8226241
    Abstract: An image projector having one or more broadband lasers designed to reduce the appearance of speckle in the projected image via wavelength diversification. In one embodiment, a broadband laser has an active optical element and a nonlinear optical element, both located inside a laser cavity. The broadband laser generates an output spectrum characterized by a spectral spread of about 10 nm and having a plurality of spectral lines corresponding to different spatial modes of the cavity. Different individual spectral lines effectively produce independent speckle configurations, which become intensity-superimposed in the projected image, thereby causing a corresponding speckle-contrast reduction.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: July 24, 2012
    Assignee: Alcatel Lucent
    Inventors: Gang Chen, Roland Ryf
  • Publication number: 20120170606
    Abstract: A laser system having a cavity formed by at least two sub-cavities and a mechanism for optically pumping a first of the at least two sub-cavities. In the system, the optical pumping mechanism is arranged in such away to not reach a laser emission threshold of the first sub-cavity, the first sub-cavity (2) comprising a device for generating a short pulse, a second sub-cavity (3) comprising an external triggering device. The first and second sub-cavities are coupled such that the triggering of the second sub-cavity has at least two such laser systems, to a light emission system with a wide spectral band, comprising such a laser system and a mechanism for generating non-linear optical effects inserted into the second sub-cavity, and to a light generator with a wide spectral band, comprising such a laser generator having at least one laser system provided with a mechanism for generating non-linear optical effects inserted into the second sub-cavity.
    Type: Application
    Filed: June 17, 2010
    Publication date: July 5, 2012
    Applicants: COMPAGNIE INDUSTRIELLE DES LASERS CILAS (CILAS), CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE- CNRS
    Inventors: Vincent Couderc, Philippe Paul Leproux, Florent Doutre, Dominique Pagnoux
  • Patent number: 8213470
    Abstract: A method for making a microchip laser includes preparing a laser-cavity chip assembly comprising a gain media, a first substantially flat surface, and a second substantially flat surface parallel to the first substantially flat surface. The method also includes forming a first reflective film on the first substantially flat surface to form a first cavity mirror, forming a second reflective film on the second substantially flat surface to form a second cavity mirror, and patterning at least one of the first reflective film or the second reflective film by removing at least a portion of the reflective film in the outer portion to form a center reflective portion in the one of the first reflective film or the second reflective film. The first cavity mirror and the second cavity mirror can suppress higher order transverse modes and produce a single TEM00 mode in the lasing light.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: July 3, 2012
    Assignee: Photop Technologies, Inc.
    Inventors: Shijie Gu, Jianyang Yang, Tyler You, Charlie Lu, Guanglei Ding
  • Patent number: 8204094
    Abstract: A laser comprises an end pump light source and a gain medium having a first end, a second end, and four sides comprising a first, a second, a third, and a fourth side. The end pump light source is optically coupled to the first end and pumps the gain medium. The first side and the third side are tapered inwardly from the first end to the first end to the second end at a taper angle ? relative to a longitudinal lasing axis and have a polished finish capable of reflecting light inside the gain medium. The second side and the fourth side are substantially parallel to the longitudinal lasing axis have a ground blasted finish. The first side is also tilted inwardly at a slant angle ? from the fourth side to the second side. A laser beam R0 exits the second end of the gain medium.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 19, 2012
    Assignee: Innova, Inc.
    Inventor: M. Cem Gokay
  • Patent number: 8189644
    Abstract: A laser assembly and method of operating the assembly are described in which a pump beam is directed through an end-pumped solid-state laser gain medium four or more times. The pump beam is directed at a slight angle through a first end of the medium, reflects off the inner surface of the second, opposite end (to form a “V”), and then reflected by an external or integrated mirror back through the first end and off the inner surface of the opposite end again (back through the “V”).
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: May 29, 2012
    Assignee: Onyx Optics, Inc.
    Inventors: Xiaodong Mu, Helmuth E. Meissner
  • Patent number: 8174040
    Abstract: A light emitting device is provided. The light emitting device comprises: a reflective layer; and a semiconductor layer including a light emitting layer on the reflective layer. A distance between the reflective layer and a center of the light emitting layer corresponds to a constructive interference condition.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: May 8, 2012
    Assignee: LG Innotek Co., Ltd.
    Inventor: Sun Kyung Kim
  • Patent number: 8143956
    Abstract: An atomic clock at optical frequency based on atomic beam and a method for generating the atomic clock comprises: The atomic beam (8) is ejected from a pile mouth after heating an atomic pile (1) in a vacuum chamber (2); A laser (4) corresponding to frequency of a clock transition transfers the atomic beam (8) from a ground state of the clock transition to an excited state of the clock transition in a adiabatic passing mode; After interaction with the laser corresponding to the frequency of a clock transition, the atomic beam (8) passes a signal detection region with a detection laser (5), and after the interaction with the detection laser (5), each of the atoms gives off a photon of spontaneous emission; An emitted fluorescence photon signal from atoms which is excited by the detection laser (5) is explored; A clock laser (4) for exploring transition frequency of an atomic clock is modulated.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: March 27, 2012
    Assignee: Peking University
    Inventor: Jing-Biao Chen
  • Patent number: 8121156
    Abstract: A semiconductor laser light source emits a laser beam for pumping. An optical resonator includes a solid laser crystal to be excited by the incident of a laser beam to oscillate a fundamental wave and a pair of fundamental wave reflective coats arranged at the opposite sides of the solid laser crystal. A wavelength conversion element converts the fundamental wave into a plurality of harmonics. The wavelength conversion element is so arranged in the optical resonator that the optical axis of at least one of the plurality of harmonics, generated in the optical resonator is made different from that of the fundamental wave and the at least one harmonic whose optical axis is made different is output substantially in the same direction as the other harmonic. By this construction, it is possible to stabilize a harmonic output and utilize a plurality of harmonics without increasing the number of parts.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: February 21, 2012
    Assignee: Panasonic Corporation
    Inventors: Toshifumi Yokoyama, Kiminori Mizuuchi, Tetsuro Mizushima, Tatsuo Itoh
  • Publication number: 20120033704
    Abstract: In a laser pump arrangement for a laser medium that amplifies a laser beam, comprising at least one laser pump source (1?) with a plurality of emitters for generating partial pumping streams (TPS1?, TPS2?), the partial pumping streams (TPS1?, TPS2?) are led through a coupling optic to a homogenizer (3?) and then are thoroughly mixed in one axis through multiple reflections. In the process, the homogenizer (3?) and the laser medium are designed and disposed such that the pump stream exiting the homogenizer (3?) is led directly onto or into the laser medium while maintaining divergence in the mixing axis (DA), wherein the partial pumping streams (TPS1?, TPS2?) are projected, in particular focused, directly onto or into the laser medium in a projection axis (PA) that is perpendicular to the mixing axis (DA).
    Type: Application
    Filed: November 6, 2009
    Publication date: February 9, 2012
    Applicant: High Q Technologies GmbH
    Inventors: Daniel Kopf, Maximilian Lederer
  • Publication number: 20110206069
    Abstract: A quasi-three level laser system having crystalline YAG or YLF doped with trivalent Dysprosium can be pumped with a laser diode in the UV, and produce a pulsed laser blue emission from the 4 F 9/2 energy level at 490 nm, a red emission at 660 nm, or a yellow emission at 570 nm. The system can operate at room temperature or be cooled. The system can include Q-switching. A suitable laser diode is GaN.
    Type: Application
    Filed: December 9, 2010
    Publication date: August 25, 2011
    Inventors: Steven R. Bowman, Nicholas J. Condon, Shawn P. O'Connor
  • Patent number: 8000371
    Abstract: A semiconductor light emitting device includes a pump light source, a gain structure, and an out-coupling mirror. The gain structure is comprised of InGaN layers that have resonant excitation absorption at the pump wavelength. Light from the pump light source causes the gain structure to emit light, which is reflected by the out-coupling mirror back to the gain structure. A distributed Bragg reflector causes internal reflection within the gain structure. The out-coupling mirror permits light having sufficient energy to pass therethrough for use external to the device. A frequency doubling structure may be disposed between the gain structure and the out-coupling mirror. Output wavelengths in the deep-UV spectrum may be achieved.
    Type: Grant
    Filed: September 22, 2009
    Date of Patent: August 16, 2011
    Assignee: Palo Alto Research Center Incorporated
    Inventors: Andre Strittmatter, Christopher L. Chua, Peter Kiesel, Noble M. Johnson
  • Patent number: 7970039
    Abstract: In a first embodiment, the invention makes use of a Neodymium doped YAG (Nd:YAG) gain medium placed in an optical resonant cavity formed by two mirrors. Power extraction is maximized for a specific laser cavity. In particular the concave curvature on the rod ends contributes a negative lensing component to modify the strength of the thermal lens. In a second embodiment the present invention uses an amplifier rod medium with curved ends to act as lensing elements to collect emission from the laser gain medium and/or oscillator described in the first embodiment of the invention. The combination of thermal lens and curved rod ends produces a lensing effect which allows light to be directly coupled from a laser. In addition, variation of the input pump power allows for control of the thermal lens formed within the amplifier rod.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: June 28, 2011
    Assignee: Powerlase Ltd.
    Inventors: Michael Mason, Duncan Parsons-Karavassilis, Nicolas Hay, Matthew Kelly, Andrew Comley, Burly Cumberland, Michael Poulter
  • Patent number: RE42499
    Abstract: An efficient, powerful and reliable system for amplifying optical pulses. Seed-pulses are generated by a seed-pulse source and are transmitted to an optical amplifier for amplification. The power for the amplification is provided by a Q-switched, diode-pumped, intracavity-doubled pump laser.
    Type: Grant
    Filed: August 19, 2002
    Date of Patent: June 28, 2011
    Assignee: Coherent, Inc.
    Inventors: Jeremy Weston, William Eugene White, Leigh John Bromley, Frank Godwin Patterson
  • Patent number: RE46937
    Abstract: The present invention relates to an apparatus comprising a diode laser (10) providing radiation in a first wavelength interval, a radiation conversion unit (12) having an input and an output, the radiation converter configured to receive the radiation in the first wavelength interval from the diode laser at the input, the radiation conversion unit configured to convert the radiation in the first wavelength interval to radiation in a second wavelength interval and the output configured to output the converted radiation, the second wavelength interval having one endpoint outside the first wavelength interval.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: July 3, 2018
    Assignee: DANMARKS TEKNISKE UNIVERSITET
    Inventors: Ole Bjarlin Jensen, Peter Eskil Andersen, Paul Michael Petersen