Semiconductor Patents (Class 372/75)
  • Publication number: 20100272145
    Abstract: The present invention relates to a solid-state laser system constituted bya solid-state laser whichis optically pumped by a vertical extended cavity surface emitting laser (VECSEL). The solid-state laser comprises a solid-state laser medium (11) arranged in a laser cavity which consists oftwo resonator cavitymirrors (10, 12), a first of saidcavity mirrors (12) being designed as an outcoupling mirror of saidsolid-state 5 laser and a second of saidcavity mirrors (10) being formed to allow optical pumping of saidsolid-state laser medium (11) through saidsecond cavity mirror (10). In the proposed solid-state laser system, the extended cavity mirror (7) of the VECSEL is constituted byone of the resonator cavity mirrors (10, 12) of the solid-state-laser. The proposed laser system provides an improved conversion efficiency and a highly 10 integrated design.
    Type: Application
    Filed: December 16, 2008
    Publication date: October 28, 2010
    Inventors: Ulrich Weichmann, Holger Moench
  • Patent number: 7822095
    Abstract: A laser having a laser cavity is disclosed that does not require conventional dielectric mirrors or as-grown reflectors. Instead, a diffraction grating and total internal reflection system is used to define a laser cavity. Within the laser cavity, the laser emission travels in a zigzag pattern. The diffraction grating provides a highly reflective “mirror” diffracting beams at a forward angle and back angle that “tunes” the process of total internal reflection. The diffraction grating also directs a small percentage of the incident radiation approximately normal to the upper face of the semiconductor (more generally, at an angle less than the critical angle), to provide an output laser beam. The laser can be used in an electron tube and laser display system.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: October 26, 2010
    Assignee: Principia Lightworks, Inc.
    Inventors: Michael D. Tiberi, Vladimir I. Kozlovsky
  • Patent number: 7817701
    Abstract: An active element for a laser source, the active element comprising an elongated bar with a reflective lateral surface, doped to be able to absorb at least a pumping beam being propagated at least approximately longitudinally in the bar in order to amplify at least a laser radiation also being propagated longitudinally; and a jacket in contact with the lateral surface of the bar and presenting a refractive index smaller than that of the bar, in the reflective lateral surface of the bar, there is at least one dull-ground diffusing zone able to interrupt the paths of spurious laser modes being propagated in the bar by total internal reflections on the lateral surface.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: October 19, 2010
    Assignee: Compagnie Industrielle des Lasers Cilas
    Inventors: Alexandra Rapaport, Luc Nguyen, Jean-Eucher Montagne
  • Patent number: 7817697
    Abstract: A method for generating a laser output signal includes the steps of: generating an optical pump signal that is a sequence optical pulses each having a duration of about n?f, where ?f represents a flourescence lifetime of a laser dye and 3?n?25; directing the optical pump signal into an optical resonant cavity having a laser dye gain element that contains the laser dye for transforming the optical pump signal into an excited optical signal; resonating the excited optical signal in the optical resonant cavity; and emitting a portion of the excited optical signal from the optical resonant cavity.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: October 19, 2010
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Richard Scheps
  • Patent number: 7801187
    Abstract: A mode-locked laser device includes a Fabry-Perot resonator, a mode-locking element disposed within the resonator, a solid-state laser medium disposed within the resonator, and exciting means for applying excitation light to the solid-state laser medium. The opposite ends of the resonator, the mode-locking element and the solid-state laser medium are disposed to provide an average beam diameter of lasing light of not more than 150 ?m on the mode-locking element and an average beam diameter of the lasing light of not more than 200 ?m within the solid-state laser medium.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: September 21, 2010
    Assignee: FUJIFILM Corporation
    Inventors: Takashi Adachi, Shogo Yamazoe
  • Patent number: 7801188
    Abstract: A laser is disclosed, which is suitable for efficient generation of continuous-wave laser light having a wavelength of about 400 nm or less. The short-wavelength light is generated by first frequency-doubling a fundamental wave, and then sum-frequency mixing the frequency-doubled wave and the fundamental wave. The non-linear interactions are effected by means of quasi-phasematching structures inside a resonant cavity where the fundamental wave is circulating. The sum-frequency mixing is effected using second or higher order quasi-phasematching, which allows for wider domains to be inverted for the quasi-phasematching structure compared to first order quasi-phasematching. Preferably, the sum-frequency mixing is effected using periodically poled stoichiometric lithium tantalate (PPSLT) for second or third order quasi-phasematching.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: September 21, 2010
    Assignee: Cobolt AB
    Inventors: Håkan Karlsson, Jonas Hellström
  • Patent number: 7796670
    Abstract: A diode laser pumped solid-state laser amplifier capable of homogenizing the distribution of heat dissipation levels on a section of a solid-state laser rod and not causing a bifocal phenomenon, and a diode laser pumped solid-state laser using the diode laser pumped solid-state laser amplifier. A diode laser pumped solid-state laser amplifier includes a solid-state laser rod having an optical axis along which a laser beam propagates and includes an active medium therein and a plurality of pumping sources having optical axes that run on a plane orthogonal to the axial core of the solid-state laser rod and are separated by a given distance from the axial core of the solid-state laser rod. When pumping light rays are projected on a plane orthogonal to the axial core of the solid-state laser rod, the plurality of pumping sources are located at equiangular intervals with respect to the axial core of the solid-state laser rod.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: September 14, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shuichi Fujikawa, Tetsuo Kojima
  • Publication number: 20100226396
    Abstract: In an optical arrangement for pumping solid-state lasers, there is the object of producing an intensity distribution across the beam cross section of the pump radiation with a rectangular intensity profile, which intensity distribution is homogeneous at least in a region corresponding to the Rayleigh range in the direction of the beam propagation without the beam quality being substantially impaired by the homogenization. The pump arrangement contains a rod-shaped homogenizer (1) with two opposed, polished end faces (2,3), planar side limit faces (4), which are arranged parallel to the optical axis and with a cross-sectional area at right angles to the optical axis, which forms a regular polygon, with the regular polygon being restricted to those number of sides which permit a plurality of polygons to be positioned against one another on a surface in such a way that they fill the space.
    Type: Application
    Filed: July 20, 2007
    Publication date: September 9, 2010
    Inventor: Guenter Hollemann
  • Patent number: 7778300
    Abstract: A semiconductor device comprising an optically pumped vertical emitter having an active vertical emitter layer (3), and a pump radiation source, which is used to generate a pump radiation field which propagates in the lateral direction and optically pumps the vertical emitter layer (3) in a pump region, the wavelength of the pump radiation field being smaller than the wavelength of the radiation field (12) generated by the vertical emitter.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: August 17, 2010
    Assignee: Osram Opto Semiconductors GmbH
    Inventors: Christian Karnutsch, Norbert Linder, Wolfgang Schmid
  • Patent number: 7771417
    Abstract: A laser system that includes a diode pump source. A frequency doubled solid state visible laser is pumped by the diode pump source and produces a pulsed laser output with a train of pulses. Resources provide instructions for the creation of the pulsed output, with on and off times that provide for substantial confinement of thermal effects at a target site. This laser system results in tissue specific photoactivation (or TSP) without photocoagulation damage to any of the adjacent tissues and without causing full thickness retinal damage and the associated vision loss.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: August 10, 2010
    Assignee: IRIDEX Corporation
    Inventors: William Telfair, Ronald Avisa, Stuart Mohr, David M. Buzawa
  • Publication number: 20100195679
    Abstract: The invention relates to a solid-state laser, comprising a resonator (1) with a monolithic structure consisting of a laser medium, on which a passive Q-switch (12) and at least one resonator mirror are directly formed, and comprising several laser diodes (22) which, as a pump medium, radiate into the resonator (1) from the side. A simple and robust configuration with simultaneous high efficiency is achieved in such a way that the monolithic resonator (1) is held at one end in a first holding plate (31) and is held at its other end in a second holding plate (32), and between the first and second holding plate (31, 32) at least one carrier ring (21) is mounted which carries several laser diodes (22) which are passively wavelength stabilized.
    Type: Application
    Filed: June 13, 2007
    Publication date: August 5, 2010
    Inventors: Gerhard Kroupa, Georg Franz, Ernst Winklhofer, Roman Leitner
  • Patent number: 7769070
    Abstract: Two end facets of a solid state laser medium function as resonating mirrors that cause a pumping light beam to resonate within the solid state laser medium, which becomes a resonator. A pumping means outputs the pumping light beam, having at least two longitudinal modes and a coherence length greater than or equal to the resonator length of the resonator, to be input to the solid state laser medium such that the laser beam resonates within the resonator.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: August 3, 2010
    Assignee: FUJIFILM Corporation
    Inventor: Tadashi Kasamatsu
  • Publication number: 20100189145
    Abstract: High-power, diode-pumped solid state (DPSS) pulsed lasers are preferred for applications such as micromachining, via drilling of integrated circuits, and ultraviolet (UV) conversion. Nd:YVO4 (vanadate) lasers are good candidates for high power applications because they feature a high energy absorption coefficient over a wide bandwidth of pumping wavelengths. However, vanadate has poor thermo-mechanical properties, in that the material is stiff and fractures easily when thermally stressed. By optimizing laser parameters and selecting pumping wavelengths and doping a concentration of the gain medium to control the absorption coefficient less than 2 cm?1 such as the pumping wavelength between about 910 nm and about 920 nm, a doped vanadate laser may be enhanced to produce as much as 100 W of output power without fracturing the crystal material, while delivering a 40% reduction in thermal lensing.
    Type: Application
    Filed: April 1, 2010
    Publication date: July 29, 2010
    Applicant: Electro Scientific Industries, Inc.
    Inventors: Xiaoyuan Peng, Wensheng Ren
  • Patent number: 7760778
    Abstract: A system and method are provided for cooling a crystal rod of a side-pumped laser. A transparent housing receives the crystal rod therethrough so that an annular gap is defined between the housing and the radial surface of the crystal rod. A fluid coolant is injected into the annular gap such the annular gap is partially filled with the fluid coolant while the radial surface of the crystal rod is wetted as a thin film all along the axial length thereof.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: July 20, 2010
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Brian K. Stewart
  • Patent number: 7742510
    Abstract: A compact optically-pumped solid-state laser designed for efficient nonlinear intracavity frequency conversion into desired wavelengths using periodically poled nonlinear crystals. These crystals contain dopants such as MgO or ZnO and/or have a specified degree of stoichiometry that ensures high reliability. The laser includes a solid-state gain media chip, such as Nd:YVO4, which also provides polarization control of the laser; and a periodically poled nonlinear crystal chip such as PPMgOLN or PPZnOLT for efficient frequency doubling of the fundamental infrared laser beam into the visible wavelength range. The described designs are especially advantageous for obtaining low-cost green and blue laser sources.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: June 22, 2010
    Assignee: Spectralus Corporation
    Inventors: Stepan Essaian, Andrei Shchegrov
  • Publication number: 20100150186
    Abstract: According to the present invention, a laser light source comprises plural semiconductor lasers (2), a solid laser (4), a non-linear material (3) as a wavelength conversion element, a reflection coat (5) formed on one facet of the solid laser, and a reflection coat (6) formed on one facet of the non-linear material (3), and the solid laser and the wavelength conversion element are disposed between the both reflection coats to constitute a laser resonator, and plural pump parts (8) in the solid laser (4) which are pumped by the plural semiconductor lasers are separated from each other by 300 ?m or more. Thereby, interference between transverse modes of laser oscillation is avoided, thereby providing a high-power, stable, and compact solid laser light source with which a stable high output power can be obtained.
    Type: Application
    Filed: July 28, 2006
    Publication date: June 17, 2010
    Applicant: Matsushita Electric Industrial Co. Ltd
    Inventors: Kiminori Mizuuchi, Kazuhisa Yamamoto, Hiroyuki Furuya, Toshifumi Yokoyama
  • Publication number: 20100150187
    Abstract: A laser apparatus in which the elimination of separate optical components to provide intra-cavity polarization and compensation for thermally induced birefringence, and their associated losses, results in an improvement in efficiency and reduction in complexity over prior art designs.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 17, 2010
    Inventors: Dmitri Feklistov, Oksana Feklistova
  • Patent number: 7720126
    Abstract: A laser amplification system is disclosed that enables reliable operation over large ambient temperature operating window, as well as a significant reduction of laser temperature sensitivity typically associated with diode pumped lasers. The techniques employed by the system effectively eliminate damaging gain hot spots and lower ASE and ESA thresholds, thereby increasing laser peak and average power levels. Additionally, the techniques allow for thermal programming of active gain medium material to minimize thermally induced aberrations. In one particular example embodiment, a variable dopant concentration multi-pass laser amplifier is provided having a customized active ion concentration profile, tailoring the combination of laser absorption and gain distribution using a ceramic YAG host.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: May 18, 2010
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: John C. McCarthy
  • Publication number: 20100111124
    Abstract: A method for emitting laser radiation includes: emitting first laser radiation using a first laser, wherein said first laser is a laser diode; receiving the first laser radiation by a second laser comprising CdSe(1?x)Sx (cadmium selenium sulfide, cadmium selenium, or cadmium sulfide), wherein x is between 0 and 1, inclusively; and responsive to receiving the first laser radiation by the second laser, emitting second laser radiation by the second laser via the CdSe(1?x)Sx; wherein the second laser radiation has a wavelength between 487 nm and 690 nm; and wherein the wavelength of the second laser radiation is responsive to the value of x, which represents the relative concentration of selenium and/or sulfur.
    Type: Application
    Filed: October 30, 2008
    Publication date: May 6, 2010
    Applicant: U.S. Government as represented by the Secretary of the Army
    Inventor: Robert C. Hoffman
  • Publication number: 20100100086
    Abstract: A satellite platform facilitates the dividing of a laser system into functional modules, and operates to provide one or more of the functional modules directly into (e.g., closer toward) a user's operational space. In a typical implementation, the satellite platform pairs two or more of the functional modules into a combination and places it in the user's operational space. The two or more functional modules can be two of the major components of the laser-system user interface, namely, the handpiece and the control panel. The combination is provided by way of the satellite platform directly into the user's operational space, while part, all, or a majority of, the laser system may remain away from the use's operational space (e.g., on the wall, on the counter-top or at the walk-way). A particular embodiment of the satellite platform takes the form of an articulated arm similar to that used for components in conventional dental chairs.
    Type: Application
    Filed: October 15, 2009
    Publication date: April 22, 2010
    Inventors: Dmitri Boutoussov, Mikhail Atlas
  • Patent number: 7701990
    Abstract: Plural LDs 6 are series-connected and pump a solid-state pumping medium 7. Each of bypass circuits 15 is connected in parallel to an associated one of the LDs 6. An operation of driving each of the bypass circuits 15 is controlled by a control circuit 14. A detection circuit 13 is provided corresponding to each of the LDs 6 and detects a short circuit failure and an open failure of each of the LDs 6 according to a voltage developed thereacross or the like. The detection circuit 13 and the control circuit 14 are connected to and are controlled by an LD shortcircuit control circuit 11. In a case where a failure of the LD is detected by the detection circuit 13, the LD shortcircuit control unit 11 determines the position of the failed LD to bypass electric current having flowed through the failed LD. Then, the control circuit 11 sends a signal to a predetermined control circuit 14 to thereby operate a predetermined bypass circuit 15.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: April 20, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takeshi Morimoto, Toshiki Koshimae, Toshiaki Watanabe, Akihiro Suzuki
  • Publication number: 20100069897
    Abstract: The invention relates to a laser device, comprising a laser material (1) brought into a simmer mode. A controllable source (7, 17) of additional energy (16, 20) supplies energy to the laser material (1), such that in only a desired part of the laser material (1) a lasing threshold is exceeded, and a laser beam (10) is emitted from only a desired part of the laser surface. This device makes possible to provide a laser beam in just the desired part of the laser, which allows a flexible and localized output. The invention further relates to a hair-removing device comprising a laser device according to the invention and further comprising an optical system (6) for focusing the laser beam pulses on a focal spot (12) and for positioning the focal spot in a target position, wherein the optical system (6) comprises a movable lens or a plurality of individually addressable lenses.
    Type: Application
    Filed: March 26, 2008
    Publication date: March 18, 2010
    Inventors: Bart Willem Jan Spikker, Rieko Verhagen
  • Patent number: 7668211
    Abstract: Methods, systems and devices for a waveguide pumping gain guided index antiguided fiber laser having a fiber selected for a refractive index crossover at a wavelength between a pump wavelength and a laser emission wavelength. A waveguide pumping system pumps a light having a pump wavelength into the fiber allowing a laser light to be captured by a gain guided process in the core while the pump light, propagating in the cladding is coupled to the core. The fiber selection includes selecting a fiber with a cladding material having a refractive index less than a core material refractive index for a pump wavelength and a core refractive index at the laser emission wavelength is less than the cladding refractive index at the same laser emission wavelength to allow the pump light to propagate through the cladding as a conventional wave guided fiber laser, white the laser emission is captured within the core as an index antiguided, gain guided wave.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: February 23, 2010
    Assignees: University of Central Florida, Research Foundation, Inc., Clomson University
    Inventors: Vikas Sudesh, Timothy McComb, Martin Richardson, William Hagemann, Michael Bass, John Ballato, Anthony Siegman
  • Publication number: 20100040105
    Abstract: An extreme ultraviolet/soft x-ray laser driven by a compact solid-state chirped pulse amplification laser system entirely pumped by laser diodes is described. The solid-state pump laser generates compressed pulses of sub-10 ps duration with energy greater than 1 J at a chosen repetition rate in a cryogenically cooled Yb:YAG system. Lasing in the 18.9 nm line of Ni-like Mo was observed. The diode-pumped laser has the potential to greatly increase the repetition rate and average power of lasers having a variety of EUV/SXR wavelengths on a significantly smaller footprint.
    Type: Application
    Filed: August 17, 2009
    Publication date: February 18, 2010
    Applicant: XUV, Inc.
    Inventors: Jorge J. Rocca, Bradley M. Luther, Brendan A. Reagan, Federico J.A. Furch
  • Patent number: 7653111
    Abstract: The invention is directed to an optically pumped surface-emitting semiconductor laser device having at least one radiation-generating quantum well structure and at least one pump radiation source for optically pumping the quantum well structure, whereby the pump radiation source comprises an edge-emitting semiconductor structure. The radiation-generating quantum well structure and the edge-emitting semiconductor structure are epitaxially grown on a common substrate. A very efficient and uniform optical pumping of the radiation-generating quantum well structure is advantageously possible with this monolithically produced semiconductor laser device. Methods for manufacturing inventive semiconductor laser devices are also specified.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: January 26, 2010
    Assignee: Osram GmbH
    Inventors: Tony Albrecht, Norbert Linder, Johann Luft
  • Publication number: 20100014547
    Abstract: The invention concerns a device for longitudinal pumping of an amplifying laser medium comprising at least one laser diode capable of emitting at least one laser beam, means for focusing said laser beam onto said amplifying laser medium and means for collimating said laser beam capable of generating a collimated laser beam. The invention is characterized in that said focusing means comprise at least one mirror, said mirror being arranged such that said collimated beam is reflected towards the amplifying medium.
    Type: Application
    Filed: January 25, 2007
    Publication date: January 21, 2010
    Inventor: Louis Cabaret
  • Patent number: 7649698
    Abstract: Laser light is emitted from a laser oscillator, and the laser light is made to enter a beam expander optical system including a concave lens through a correction lens. The laser oscillator, the correction lens and the concave lens are disposed so that, when an emission point of the laser oscillator is a first conjugate point, a point at which an image at the first conjugate point is formed through the correction lens is a second conjugate point, a distance between the correction lens and the second conjugate point is b, a focal length of the concave lens is f, and a distance between the correction lens and the concave lens is X, the X satisfies b?3|f|?X?b+|f|.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: January 19, 2010
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Koichiro Tanaka
  • Patent number: 7643530
    Abstract: External-cavity optically-pumped semiconductor lasers (OPS-lasers) including an OPS-structure having a mirror-structure surmounted by a surface-emitting, semiconductor multilayer (periodic) gain-structure are disclosed. The gain-structure is pumped by light from diode-lasers. The OPS-lasers can provide fundamental laser output-power of about two Watts (2.0 W) or greater. Intracavity frequency-converted arrangements of the OPS-lasers can provide harmonic laser output-power of about one-hundred milliwatts (100 mW) or greater, even at wavelengths in the ultraviolet region of the electromagnetic spectrum. These high output powers can be provided even in single axial-mode operation.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: January 5, 2010
    Assignee: Coherent, Inc.
    Inventors: Andrea Caprara, Juan L. Chilla, Luis A. Spinelli
  • Publication number: 20090323739
    Abstract: A compact optical system is provided for delivering laser radiation with high optical efficiency and uniformity. The optical system includes, in order of the propagation of light, an expander for producing a collimated beam, a beam shaper including a flat window with a diffraction pattern on one side for transforming the collimated beam into a square top-hat output beam, a corrector for bending the square top-hat output beam back to a system axis, a scan head to scan the square top-hat output beam across the substrate, and a scan lens to image the beam at the substrate plane.
    Type: Application
    Filed: June 25, 2009
    Publication date: December 31, 2009
    Applicant: UV TECH SYSTEMS
    Inventors: David J. Elliott, Kenneth J. Harte, Ronald P. Millman, Victoria M. Chaplick
  • Patent number: 7639722
    Abstract: An optical element for homogenizing and, possibly, concentrating the output from high-power two-dimensional semiconductor laser arrays, which has the basic shape of a convex-flat cylindrical lens with a facet cut into the convex surface for each individual semiconductor laser bar.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: December 29, 2009
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Alan H. Paxton, Harold C. Miller, Jonathan Stohs
  • Patent number: 7636379
    Abstract: A pumping system for a laser source includes a pump diode that emits a pump beam having a central wavelength that varies with temperature. A selective mirror having a plurality of spectral reflectivity peaks, corresponding to a plurality of predetermined wavelengths, locks the operation of the pump diode onto one of the predetermined wavelengths in accordance with temperature.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: December 22, 2009
    Assignee: Compagnie Industrielle des Lasers Cilas
    Inventors: Jean-Eucher Montagne, Marc Le Neve
  • Patent number: 7633990
    Abstract: A method for increasing the efficiency of generating lasers by pumping two separate wavelengths into an erbium-based medium to populate the 4I11/2 state and depopulate the 4I13/2 state. A first excitation wavelength region is located between approximately 955 nm to approximately 1100 nm. The second excitation wavelength region is located between approximately 1600 nm to approximately 1850 nm. This multi-wavelength pumping scheme may be operated in continuous wave or quasi-continuous wave mode.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: December 15, 2009
    Inventor: Ramesh K. Shori
  • Publication number: 20090296748
    Abstract: A diode pumped laser is disclosed having a CW level and adapted to output one or more pulses having peak power greater than the CW level thereby to provide higher peak power for use in material piercing or penetrating operations without affecting diode lifetime.
    Type: Application
    Filed: July 17, 2009
    Publication date: December 3, 2009
    Applicant: GSI GROUP LIMITED
    Inventors: Mark Greenwood, Christopher Parsons, Mohammed Naeem
  • Publication number: 20090290606
    Abstract: A laser resonator includes an OPS gain-structure that is pumped with optical pulses repeatedly delivered at a pulse-repetition frequency corresponding to a resonant frequency of the laser resonator. The laser resonator additionally includes a passive mode-locking arrangement such that the resonator delivers mode-locked optical pulses. In one example the laser resonator further includes a CW optically pumped OPS gain-structure for increasing the power of the mode-locked pulses delivered from the resonator.
    Type: Application
    Filed: May 23, 2008
    Publication date: November 26, 2009
    Inventors: Juan L. Chilla, Bojan Resan, R. Russel Austin
  • Publication number: 20090279577
    Abstract: A laser amplification system is disclosed that enables reliable operation over large ambient temperature operating window, as well as a significant reduction of laser temperature sensitivity typically associated with diode pumped lasers. The techniques employed by the system effectively eliminate damaging gain hot spots and lower ASE and ESA thresholds, thereby increasing laser peak and average power levels. Additionally, the techniques allow for thermal programming of active gain medium material to minimize thermally induced aberrations. In one particular example embodiment, a variable dopant concentration multi-pass laser amplifier is provided having a customized active ion concentration profile, tailoring the combination of laser absorption and gain distribution using a ceramic YAG host.
    Type: Application
    Filed: May 6, 2008
    Publication date: November 12, 2009
    Inventor: John C. McCarthy
  • Patent number: 7602832
    Abstract: A vertical external cavity surface emitting laser is provided that is integrally mounted on a single heat sink together with a pump laser. In the surface emitting laser, a laser chip has a gain structure to emit light at a predetermined wavelength and it is disposed on a center portion of a top surface of a heat sink, an external mirror is spaced apart from the laser chip at a predetermined distance to transmit a portion of the light emitted from the laser chip to an outside and to reflect the remaining portion of the light to the laser chip, a pump laser is disposed on one side of a top surface of the heat sink to emit pump light in a horizontal direction for activating the laser chip, and a reflection mirror is disposed on the other side of the top surface of the heat sink opposite to the pump laser to reflect the pump light emitted from the pump laser to the laser chip.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: October 13, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Soo-haeng Cho, Seong-jin Lim
  • Patent number: 7590160
    Abstract: A laser amplifier includes a laser active slab with a source of pump power to amplify an input laser beam, the laser active slab including a block of laser active material having opposed lateral faces defining a wedge lateral dihedral angle, opposed longitudinal faces, and opposed parallel transverse faces, the wedge lateral dihedral angle specified to minimize parasitic amplified spontaneous emission. The source of pump power may be one or more laser diode bars and microlenses producing a gain sheet in the laser active slab. The lateral faces may include optical coatings highly transmitting at a wavelength of the pump power and highly reflecting at a lasing wavelength to provide a folded path for the input laser beam though the gain sheet.
    Type: Grant
    Filed: November 26, 2004
    Date of Patent: September 15, 2009
    Inventor: Jeffrey G. Manni
  • Publication number: 20090213881
    Abstract: An optically pumped semiconductor apparatus having a surface-emitting semiconductor body (1) which has a radiation passage area (1a) which faces away from a mounting plane of the semiconductor body (1), and an optical element (7) which is suitable for directing pump radiation (17) onto the radiation passage area (1a) of the semiconductor body (1).
    Type: Application
    Filed: December 29, 2006
    Publication date: August 27, 2009
    Inventors: Ulrich Steegmüller, Frank Singer, Thomas Schwarz, Michael Kühnelt
  • Patent number: 7577179
    Abstract: The laser radiation apparatus is provided having substantial light emission intensity although the laser radiation apparatus is miniaturized. A solid state laser rod; the excitation light source formed such that the excitation light source surrounds an emission axis in a section perpendicular with respect to the emission axis of laser light of the solid state laser rod; and a lens barrel placed so that the lens barrel surrounds the excitation light source and condenses light from the excitation light source to the solid state laser rod. Excitation light reflected upon inner surface of the lens barrel is radiated uniformly over the lateral surface of the laser rod so that laser active medium is efficiently excited, and energy conversion rate is improved.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: August 18, 2009
    Assignee: Panasonic Corporation
    Inventor: Takeshi Nishida
  • Patent number: 7564890
    Abstract: A laser equipment for outputting output lights having different wavelengths includes: a substrate; an excitation light generation element for emitting excitation lights including surface emitting laser elements and disposed on the substrate; and a light converter having a pair of second reflection layers and a solid laser medium layer, both of which provide a resonator. The solid laser medium layer is capable of generating lights having different peak wavelengths by receiving the excitation lights. The light converter is disposed on an output surface of the excitation light generation element.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: July 21, 2009
    Inventors: Nobuyuki Otake, Katsunori Abe
  • Patent number: 7551660
    Abstract: An optically pumped semiconductor laser apparatus. The apparatus includes a vertical emitter which has a central waveguide and a quantum well structure which is arranged within the central waveguide and has at least one quantum layer. The apparatus also includes a pump radiation source, which optically pumps the quantum well structure and comprises at least one pump waveguide in which the pump radiation is guided. The width of the central waveguide is greater than the width of the pump waveguide, with the width of the central waveguide and the width of the pump waveguide being matched to one another such that the quantum well structure of the vertical emitter is pumped uniformly.
    Type: Grant
    Filed: May 5, 2003
    Date of Patent: June 23, 2009
    Assignee: Osram Opto Semiconductors GmbH
    Inventor: Stephan Lutgen
  • Patent number: 7529287
    Abstract: An optical system comprises optical pump lasers, depolarizing filters and a multiplexer. A plurality of optical pump lasers generates a plurality of initial optical signals at different wavelengths. A plurality of depolarizing filters depolarize the plurality of initial optical signals. A multiplexer multiplexes the plurality of initial optical signals to form at least one optical pump signal. These systems and methods advantageously provide at least one optical pump signal with the required energy spread across multiple polarizations with fewer optical pump lasers. The reduction of optical pump lasers may eliminate the need to balance or adjust the power and polarization of each optical pump laser. Further, by reducing the number of optical pump lasers, the rate of component failure also reduces. As a result, these systems and methods are more reliable, may reduce maintenance costs, and may reduce the size as well as weight of the optical pumping system.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: May 5, 2009
    Assignee: Sanmina-SCI Corporation
    Inventor: Brian Chaput
  • Patent number: 7522651
    Abstract: Solid-state laser(s) pumped by incoherent, monochromatic light from sources such as LED arrays and integrating technologies such as high power LED arrays and solid-state laser materials in conjunction with efficient and uniform absorption of pumping energies through a diffusing pump chamber. The resulting laser(s) are compact, robust, low-cost, and able to produce high power output for practical applications. It may efficiently operate over wide temperature and performance ranges, at CW or pulse modes, even with ultra short pulse width and/or extremely high repetition rates. Our inventive structure(s) is/are highly flexible and applicable to a large group of lasing media including those with very short upper state life times. Advantageously, they may be applied to a plethora of laser systems at wavelengths that have important applications and unavailable to other direct pumping technologies.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: April 21, 2009
    Assignee: Pavilion Integration Corporation
    Inventors: Ningyi Luo, Sheng-Bai Zhu, Shaoping Lu, Feng Zhou
  • Publication number: 20090080481
    Abstract: A semiconductor laser device (5) comprising at least one semiconductor laser chip (7) is provided, wherein the semiconductor laser chip (7) contains an active layer that emits electromagnetic radiation. Further, at least one corner reflector (1) is formed in the semiconductor laser chip (7). The corner reflector (1) has a first and a second reflective surface (14, 15), wherein the first and the second reflective surface (14, 15) are arranged at an angle of less than 90 degrees with respect to one another. This results in an improved emission characteristic of the radiation emitted by the semiconductor laser device (5).
    Type: Application
    Filed: September 11, 2008
    Publication date: March 26, 2009
    Applicant: OSRAM Opto Semiconductors GmbH
    Inventors: Hans LINDBERG, Stefan Illek
  • Publication number: 20090052493
    Abstract: According to the invention, the lateral surface (5) of the doped bar (2) comprises at least one dull-ground diffusing zone (19) able to interrupt the paths of the spurious laser modes.
    Type: Application
    Filed: May 27, 2008
    Publication date: February 26, 2009
    Inventors: Alexandra RAPAPORT, Luc Nguyen, Jean-Eucher Montagne
  • Patent number: 7496127
    Abstract: An optical waveguide propagates a laser beam. Main diffraction grating and sub-diffraction grating couple light propagating in the optical waveguide. The main diffraction grating and the sub-diffraction grating couple the light in such a manner that propagation in a second order transverse mode of the light propagating in the optical waveguide when both the main diffraction grating and the sub-diffraction grating are disposed, is suppressed more than propagation in the second order transverse mode of the light propagating in the optical waveguide when only the main diffraction grating is disposed.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: February 24, 2009
    Assignee: Fujitsu Limited
    Inventors: Manabu Matsuda, Tsuyoshi Yamamoto
  • Publication number: 20090022201
    Abstract: Alkali-vapor laser and related methods of lasing are described herein. In some embodiments, a diode-pumped gas-vapor laser is provided that can be scaled to high power. For example, in one embodiment, a triply-transverse configuration of a diode-pumped-alkali-laser (DPAL) is disclosed in which alkali-buffer gain medium is flowed through an laser chamber (for example, configured as an optical resonator or amplifier) whose optical axis is nominally transverse to the flow direction, and whose pump array radiation is propagated into the alkali-buffer gain medium in a direction nominally transverse to both the direction of gain medium flow and the direction of the optical axis.
    Type: Application
    Filed: May 16, 2008
    Publication date: January 22, 2009
    Applicant: GENERAL ATOMICS
    Inventors: William F. Krupke, Jason Stuart Zweiback, Alexander A. Betin
  • Publication number: 20090003402
    Abstract: A laser includes a Ti:sapphire gain-element that is optically pumped by radiation from a semiconductor laser device. In one example the semiconductor laser device is an InGaN diode-laser array and the gain-element is optically pumped by radiation emitted by that array. In another example, the semiconductor laser device is an optically pumped semiconductor laser (OPS-laser) optically pumped by radiation from an InGaN diode-laser array. In a further example the semiconductor device is an intracavity frequency-doubled OPS laser.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventors: Joris Van Nunen, Hailong Zhou, H. Yang Pang
  • Publication number: 20080317083
    Abstract: This invention relates to a novel diode pump and a method of manufacturing the same. An optical laser pulse beam expander, through which a laser beam is guided forward, is integrated as a part of the diode pump according to the invention. The light bars of the diode pump are preferably made from a material that is harder than silicon and that resists large amounts of power, such as from diamond, sapphire, ruby or titanium sapphire. Using a diode pump according to the invention it is possible to guide a laser beam forward without power-restricting optical transmission fibers or optical high-power connectors. The invention enables the manufacture of very high-power diode pumps and the use thereof as a part of a laser apparatus.
    Type: Application
    Filed: July 13, 2006
    Publication date: December 25, 2008
    Applicant: PICODEON LTD OY
    Inventor: Jari Ruuttu
  • Patent number: 7469001
    Abstract: A waveguide mode isolation layer added between the active region and the heat sink bonding material of an optically pumped semiconductor laser isolates the optical mode from the bonding material.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: December 23, 2008
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Andrew Ongstad, Ron Kaspi, Greg Dente, Michael Tilton, Joseph R. Chavez