Class / Patent application number | Description | Number of patent applications / Date published |
372019000 | Mode discrimination | 29 |
20080232408 | Method and apparatus for stabilizing and tuning the bandwidth of laser light - According to aspects of an embodiment of the disclosed subject matter, method and apparatus are disclose that ma y comprise adjusting a differential timing between gas discharges in the seed laser and amplifier laser for bandwidth control, based on the error signal, or for control of another laser operating parameter other than bandwidth, without utilizing any beam magnification control, or adjusting a differential timing between gas discharges in the seed laser and amplifier laser for bandwidth control, based on the error signal, or for control of another laser operating parameter other than bandwidth, while utilizing beam magnification control for other than bandwidth control, and adjusting a differential timing between gas discharges in the seed laser and amplifier laser for bandwidth control, based on the error signal, or for control of another laser operating parameter other than bandwidth, while utilizing beam magnification control for bandwidth control based on the error signal. | 09-25-2008 |
20080247426 | Broad-Area Microlasers and Methods for Driving Them - A multi-mode microlaser and a method for driving a multi-mode broad-area microlaser such as a multi-mode VCSEL is described such that the multi-mode microlaser shows an unexpected Gaussian-like far-field intensity distribution. The driving conditions are in general determined such that a strong reduction of the degree of spatial coherence occurs. For square pulsed driving current, these conditions are determined by the pulse duration p | 10-09-2008 |
20080279229 | SURFACE EMITTING SEMICONDUCTOR LASER, METHOD FOR FABRICATING SURFACE EMITTING SEMICONDUCTOR LASER, MODULE, LIGHT SOURCE APPARATUS, DATA PROCESSING APPARATUS, LIGHT SENDING APPARATUS, OPTICAL SPATIAL TRANSMISSION APPARATUS, AND OPTICAL SPATIAL TRANSMISSION SYSTEM - A surface emitting semiconductor laser includes a substrate, a lower reflective mirror formed on the substrate, an active layer formed on the lower reflective mirror, an upper reflective mirror formed on the active layer, an optical mode controlling layer formed between the lower reflective mirror and the upper reflective mirror, and a current confining layer formed between the lower reflective mirror and the upper reflective mirror. The active layer emits light. The upper reflective mirror forms a resonator between the lower reflective mirror and the upper reflective mirror. In the optical mode controlling layer, an opening is formed for selectively absorbing or reflecting off light that is emitted in the active layer. The optical mode controlling layer optically controls mode of laser light. The current confining layer confines current that is applied during driving. | 11-13-2008 |
20080285601 | External cavity semiconductor laser and method for fabrication thereof - The present invention concerns a design for an external cavity single mode laser wherein a short optical path length for the optical cavity (e.g., ˜3 to 25 mm) provides sufficient spacing of the longitudinal modes allowing a single wavelength selective element, such as a microfabricated etalon, to provide a single mode of operation, and optionally a selectable mode of operation. | 11-20-2008 |
20080310462 | Anamorphotic solid-sate laser - A laser system, which is used in material processing to produce a radiation line of small width and uniform high intensity in the longitudinal direction, produces radiation that has different mode numbers M | 12-18-2008 |
20090074015 | LASER OUTPUT SWITCHING BY TRANSVERSE MODE MODULATION - A pulsed laser for machining, has a mode switch, e.g. Q-switch device ( | 03-19-2009 |
20090097509 | Laser Apparatus - This utility model discloses a type of laser apparatus comprising a back mirror, a YV04 crystal, a Q-SW crystal, a front mirror, an optical pumping source, an optical fiber splice, a directional light-regulating lens and a laser head. The back mirror is a plano-concave lens, the incidence point of optical pumping source is deviated from the end surface center of YV04 crystal by 0-2 mm; under the back mirror there is a back mirror regulator; under the Q-SW crystal there is a Q-SW crystal regulator; above the front mirror there is a lens regulator; the laser head is located in front of the back mirror, the directional light-regulating lens is set in front of the laser head, the optical fiber splice is set in front of the directional light-regulating lens and under the lens there is a lens regulator. During use, the optical pumping source may generate two laser resonance paths, thus the laser conversion can be improved, Nd—YV04 is heated uniformly; Because there are two laser resonance paths, so the laser cavity length has a wide range of application: 40 mm-200 mm, in such a way that the technical difficulty in manufacturing the laser cavity is reduced. | 04-16-2009 |
20090110011 | OPTICAL COMPONENT FOR LASER BEAM - The present invention is to suppress deterioration of durability at the time when an optical component using a material optimized to be used in an optical path of a laser beam for performing reproduction/recording for a CD and a DVD is used in an optical head device using light sources including a blue semiconductor laser. A first transparent substrate | 04-30-2009 |
20090185585 | MODE-MATCHING SYSTEM FOR TUNABLE EXTERNAL CAVITY LASER - An external cavity laser includes a lasing cavity and an optically coupled feedback cavity having differently spaced resonant lasing and feedback mode frequencies. The lasing modes can be collectively or individually matched to selected feedback modes. For example, a current driving the lasing cavity can be adjusted to shift individual lasing modes into alignment with the selected feedback modes. | 07-23-2009 |
20090213878 | Broad-Area Microlasers and Methods for Driving Them - A multi-mode microlaser and a method for driving a multi-mode broad-area microlaser such as a multi-mode VCSEL is described such that the multi-mode microlaser shows an unexpected Gaussian-like far-field intensity distribution. The driving conditions are in general determined such that a strong reduction of the degree of spatial coherence occurs. For square pulsed driving current, these conditions are determined by the pulse duration p | 08-27-2009 |
20100014543 | LASER AND A METHOD FOR OPERATING THE LASER - A laser comprising: a resonator cavity defined by at least two reflectors, wherein the at least two reflectors are highly reflective at a plurality of fundamental wavelengths; a laser medium disposed in the resonator cavity capable of generating plurality of fundamental wavelengths; an optical pump source for energizing the laser medium, thereby causing laser light at the plurality of fundamental wavelengths to resonate in the resonator cavity simultaneously; and a nonlinear material located in said resonator cavity capable of simultaneously converting each of the plurality of wavelengths of laser light to generate converted laser light having a plurality of converted wavelengths, said converted wavelengths being derived from but different to the fundamental wavelengths; wherein the non-linear material is at least partially phase matched to nonlinearly convert the frequencies of each of the fundamental wavelengths simultaneously such that a plurality of converted wavelengths are able to be simultaneously generated. | 01-21-2010 |
20100020833 | INTRA-CAVITY NON-DEGENERATE LAGUERRE MODE GENERATOR - A lasing method including the steps of providing a laser resonator; utilizing birefringence compensation in said resonator whereby said resonator is induced to operate in a Laguerre-Gaussian higher order mode; and utilizing polarized outcoupling of lasing energy at said higher order mode from said resonator. In the illustrative application, the laser resonator is a high-power, solid-state laser resonator. In the specific embodiment, the inventive method further includes the step of changing an outcoupling preference for a non-degenerate high-order Laguerre-Gaussian mode. In one embodiment, the step of changing outcoupling preference includes the step of changing an outcoupling polarization. In another embodiment, the step of changing outcoupling preference includes the step of changing an orientation of a roof edge of a prism in the laser resonator. Lower order Laguerre modes are discouraged from appearing in an output of the resonator by adding loss at the center of the rod aperture of the resonator or detuning the orientation of a first or a second quarter-wave plate. In the illustrative embodiment, the gain lifetime of the resonator is longer than an interpulse period thereof. | 01-28-2010 |
20100074280 | SINGLE-LONGITUDINAL MODE LASER WITH ORTHOGONAL-POLARIZATION TRAVELING-WAVE MODE - A single longitudinal-mode laser includes a first mirror and a second mirror that define a laser cavity therein that does not include a linear polarizer. A birefringent gain medium can generate a lasing light at a lasing wavelength along a light propagation direction in response to a pump light at a pumping wavelength. The birefringent gain medium has an optical axis substantially perpendicular to the light propagation direction. A first wave plate positioned between the first mirror and the birefringent gain medium is a quarter wave plate at the lasing wavelength and a whole wave plate at the pumping wavelength. A second wave plate is positioned between the birefringent gain medium and the second mirror. The first wave plat and the second wave plate in part produce a single longitudinal mode in the lasing light. | 03-25-2010 |
20100118898 | MODE SELECTION TECHNIQUE FOR A LASER - A mode selection technique in a laser is described wherein a recess is formed in a surface of a waveguide in the laser. The recess provides a region of free space propagation within the waveguide which preferentially selects the lowest order mode. A mode selective RF excited CO | 05-13-2010 |
20110038389 | COMPACT LASER SOURCE WITH REDUCED SPECTRAL WIDTH - The invention relates to a laser source with an external cavity generating a useful laser beam (Fu), that comprises at least one laser diode DL ( | 02-17-2011 |
20110058578 | LASER AND A METHOD FOR OPERATING THE LASER - A laser comprising: a resonator cavity defined by at least two reflectors, wherein the at least two reflectors are highly reflective at a plurality of fundamental wavelengths; a laser medium disposed in the resonator cavity capable of generating plurality of fundamental wavelengths; an optical pump source for energizing the laser medium, thereby causing laser light at the plurality of fundamental wavelengths to resonate in the resonator cavity simultaneously; and a nonlinear material located in said resonator cavity capable of simultaneously converting each of the plurality of wavelengths of laser light to generate converted laser light having a plurality of converted wavelengths, said converted wavelengths being derived from but different to the fundamental wavelengths; wherein the non-linear material is at least partially phase matched to nonlinearly convert the frequencies of each of the fundamental wavelengths simultaneously such that a plurality of converted wavelengths are able to be simultaneously generated. | 03-10-2011 |
20110058579 | LASER LIGHT SOURCE - A laser light source | 03-10-2011 |
20110103411 | Tunable Quantum Cascade Lasers and Photoacoustic Detection of Trace Gases, TNT, TATP and Precursors Acetone and Hydrogen Peroxide - Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented. | 05-05-2011 |
20110164631 | Synchronous pumping of a wagon wheel optical cavity - A laser cavity structure is disclosed which pertains to laser resonator geometries possessing circular symmetry, such as in the case of disk or spherical lasers. The disclosed invention utilizes a very-high finesse Bragg reflector (VHF-BR) thin film reflectors of many layer pairs of very small refractive index difference, the VHF-BR deposited on a surface of revolution, thereby forming an optical cavity. These dielectric reflectors are disposed in such a way as to allow selection of preferred low order modes and suppression of parasitic modes while allowing a high cavity Q factor for preferred modes. The invention disclosed, in its preferred embodiments, is seen as particularly useful in applications requiring high efficiency in the production and coupling of coherent radiation. This is accomplished in a cavity design that is relatively compact and economical. | 07-07-2011 |
20110280264 | SOLID-STATE LASER DEVICE - There is provided a solid-state laser device including: a resonator; a solid-state laser medium disposed in the resonator; an excitation section that irradiates an excitation beam into the solid-state laser medium; a mode selector that controls transverse modes of oscillating light in the resonator; and a movement section that moves the mode selector along the resonator optical axis direction. | 11-17-2011 |
20110310915 | METHODS AND APPARATUS FOR SINGLE-MODE SELECTION IN QUANTUM CASCADE LASERS - Methods and apparatus for improved single-mode selection in a quantum cascade laser. In one example, a distributed feedback grating incorporates both index-coupling and loss-coupling components. The loss-coupling component facilitates selection of one mode from two possible emission modes by periodically incorporating a thin layer of “lossy” semiconductor material on top of the active region to introduce a sufficiently large loss difference between the two modes. The lossy layer is doped to a level sufficient to induce considerable free-carrier absorption losses for one of the two modes while allowing sufficient gain for the other of the two modes. In alternative implementations, the highly-doped layer may be replaced by other low-dimensional structures such as quantum wells, quantum wires, and quantum dots with significant engineered intraband absorption to selectively increase the free-carrier absorption losses for one of multiple possible modes so as to facilitate single-mode operation. | 12-22-2011 |
20120250706 | TRANSVERSE LASER MODE SWITCHING | 10-04-2012 |
20130322471 | Modal Corrector Mirror With Compliant Actuation For Optical Aberrations - A laser resonator is provided that includes a cavity bounded by an end mirror and output coupler, and one or more gain media between the end mirror and output coupler. The laser resonator also includes a modal corrector mirror between the end mirror and output coupler. The modal corrector mirror includes a controllable-profile faceplate including an optically-treated front surface, and an array of static actuators. Each static actuator includes an adjustable element, and a compliant mechanism located between the adjustable element and faceplate. The adjustable element is configured to exert a selectable, localized push-pull force on the faceplate via the compliant mechanism, and the compliant mechanism is configured to scale the respective force. | 12-05-2013 |
20140307751 | LASER PROCESSING APPARATUS CARRYING OUT CONTROL TO REDUCE CONSUMED POWER - A laser processing apparatus including a laser oscillator, a laser processing machine, and a control part controlling the laser oscillator and the laser processing machine. The control part includes a preparatory operation part controlling the laser processing machine so as to start a preparatory operation for the laser processing if a preparatory operation command is output and, a mode switching part switching an operating mode of the laser oscillator between a standard standby mode before carrying out the laser processing and an energy saving mode with less consumed power than the standard standby mode, and the mode switching part controls the discharge tube voltage so as to switch the operating mode to the energy saving mode before the preparatory operation command is output and to start a switching operation of the operating mode from the energy saving mode to the standard standby mode when the preparatory operation command is output. | 10-16-2014 |
20140321485 | Resonator Based External Cavity Laser - An external cavity laser comprises a gain medium and an external cavity resonator without the use of a semi-reflective surface placed between the gain medium and the resonator. Radiation from the gain medium is reflected back to the gain medium by one or more resonant backscattering regions of the resonator, such that the entire optical path between the gain medium and the external cavity resonator could be free from a reflective surface. | 10-30-2014 |
20150078407 | SEMICONDUCTOR LASER EXCITED SOLID STATE LASER DEVICE AND LASER LIGHT OUTPUT METHOD - A semiconductor laser excited solid state laser device and method. The device including a semiconductor laser; a driving device; a solid state laser module which has maximum output efficiency at the set temperature and which generates, from excitation light, an output light of a predetermined output level when the optical noise is at or below a fixed level and the output level of the excitation light is the set output level; a single temperature adjustment device which adjusts the temperature of the semiconductor laser and the temperature of the solid state laser module; and a control device which controls the driving device such that the output light will be at the predetermined output level and controls the temperature adjustment device such that the temperature of the semiconductor laser and the solid state laser module will be the set temperature. | 03-19-2015 |
20150318662 | LASER RESONATOR WITH PARASITIC MODE SUPPRESSION - The resonator includes a lasing medium having a thickness, a first mirror disposed at a first end of the lasing medium and a second mirror disposed at a second end of the lasing medium. the first and second mirror cooperate to fold an intra-cavity laser beam along a plurality of paths through the lasing medium, thereby defining a boundary of a superfluous region within the resonator, wherein the intra-cavity laser beam does not pass through the superfluous region. The first mirror and the second mirror form a laser resonator for a parasitic laser mode, a portion of which is located within the superfluous region. A parasitic mode suppressor is located within the superfluous region of the resonator. | 11-05-2015 |
20150325979 | EDGE EMITTING SEMICONDUCTOR LASER - An edge emitting semiconductor laser includes a semiconductor body including a waveguide region, the waveguide region including first and second waveguide layers and an active layer arranged between the first and second waveguide layers, that generates laser radiation; the waveguide region is arranged between a first and second cladding layers disposed downstream of the waveguide region; a phase structure for selection of lateral modes of the laser radiation emitted by the active layer, wherein the phase structure includes at least one cutout extending from a top side of the semiconductor body into the second cladding layer; at least one first intermediate layer composed of a semiconductor material different from that of the second cladding layer embedded into the second cladding layer; and the cutout at least partly extends from the top side into the first intermediate layer; the second cladding layer contains a first partial layer adjoining the waveguide region. | 11-12-2015 |
20160072256 | MODE-CONTROLLED LASER SYSTEM - A mode-controlled laser system includes an active region to generate optical energy in response to an electric signal. The system also includes a mirror to resonate the optical energy in an optical cavity. The system also includes a HCG mode control reflector arranged in the optical cavity to control the resonated optical energy into a substantially non-Gaussian intensity profile. The resonated optical energy can be emitted as an optical signal having the substantially non-Gaussian intensity profile. | 03-10-2016 |