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| Number | Title | Issue Date |
| 7352505 | Device and method for converting an optical frequency To optimise the transformation rate (efficiency) in the optical frequency conversion of laser beams of ultra-short light pulses in optically non-linear media such as a crystal (56), a double refracting crystal (54) is arranged in the beam path before t... | 04/01/2008 |
| 7336690 | Solid-state laser system A simple and high-reliability constitution provides a solid-state laser system that allows a high-output, long-pulse-width laser beam to be obtained. A solid-state laser system that includes a solid-state laser medium 1, a light source 2 for pum... | 02/26/2008 |
| 7326876 | Sequential lateral solidification device A sequential lateral solidification device, for enhancing optical characteristics of the device and for preventing damage caused by an ablation of a crystallization thin film, is disclosed. The device includes a laser light source generating a laser beam, a projecti... | 02/05/2008 |
| 7301974 | Wavelength monitoring apparatus An optical signal emitted from a semiconductor laser is converged by a lens and then received by a single uniaxial birefringent crystal having a C axis that is inclined at an angle other than 90 degrees against a laser optical axis to output an optical signal having... | 11/27/2007 |
| 7283302 | Wavelength filter and wavelength monitor device A wavelength filter includes a solid material that is optically transparent and including a pair of planar surfaces substantially parallel to each other; and a supporting member that supports the solid material on a planar surface of the solid material other than th... | 10/16/2007 |
| 7230964 | Lithography laser with beam delivery and beam pointing control The present invention provides a modular high repetition rate ultraviolet gas discharge laser light source with a beam delivery to a production line machine. The system includes an enclosed and purged beam path with beam pointing control for delivery the laser beam ... | 06/12/2007 |
| 7174198 | Non-invasive detection of analytes in a complex matrix A system and method for determining the concentration of analytes of interest in complex matrices is provided. According to one aspect of the present invention, near-infrared analytical radiation is generally directed onto a portion of a specimen containing the anal... | 02/06/2007 |
| 7158548 | Laser cavity A laser cavity comprising a gain medium and first and second end mirrors, wherein the laser cavity further comprises a birefringent material and a mirror arranged to fold light propagating within the laser cavity through a predetermined angle, wherein the predetermi... | 01/02/2007 |
| 7085303 | Laser with combined lens and birefringence compensator A laser includes a chamber having a front mirror and a back mirror defining a optical propagation path. An optical gain medium such as a solid state disk, rod or slab is located between the front and back mirrors within the chamber to produce a laser light along the... | 08/01/2006 |
| 6934311 | Semiconductor laser module and Raman amplifier A semiconductor laser module has a Fabry-Perot type semiconductor laser device, an optical fiber, and first and second lenses. The tip of the optical fiber, on which the laser beam falls, is askew polished. The optical fiber is fixed in such a manner that the axis o... | 08/23/2005 |
| 6931031 | Generating electronic carrier signals in the optical domain A dual wavelength optical fiber distributed feedback laser comprises a pump laser coupled to a birefringent fiber in which a first grating device (two co-located single phase-shift fiber Bragg gratings (FBGs)) is provided. The grating device gives the laser two pote... | 08/16/2005 |
| 6888856 | Method and apparatus for filtering an optical beam The invention pertains to wavelength-agile optical filters suitable for wavelength-division-multiplexed (WDM) optical communications networks. More particularly, the invention pertains to optical filters with a wavelength reference that can be remotely switched to a... | 05/03/2005 |
| 6853654 | Tunable external cavity laser Apparatus and methods that utilize tunable elements to provide for selective wavelength tuning of a light beam. The apparatus comprises a first tunable wavelength selection element having a first adjustable free spectral range, a second tunable wavelength selection ... | 02/08/2005 |
| 6850544 | Optical resonators with orthogonally polarized modes An optical resonator supporting two sets of simultaneously co-existent oscillation modes (30 and 31), having polarizations orthogonal to each other. Mode control elements (28 and 29), such as apertures and phase elements, are introduced i... | 02/01/2005 |
| 6816534 | Tunable single frequency filter for lasers A single frequency filter for a laser, comprising a polarizer that defines a direction of polarization and one or more birefringent elements situated within the cavity with their dielectric axes offset from the direction of polarization. The ends of the birefringent... | 11/09/2004 |
| 6804271 | Light emission methods and light emission devices Light emission methods and light emission devices are described including method and devices capable of emitting light at a plurality of controllable wavelengths. According to one aspect, a light emission method includes providing a control signal and emitting light... | 10/12/2004 |
| 6795623 | Optical cavity resonating over a continuous range of frequencies An optical resonant cavity (50) defined between two mirrors (13′, 40), one of which (40) is a variable pitch Bragg reflector grating, is characterized in that a parameter CS of variation of the Bragg wavelength of the grating is suc... | 09/21/2004 |
| 6754249 | Laser resonator for generating polarized laser radiation A method for generating polarized laser output radiation utilizes a laser resonator whose active medium exhibits thermally induced birefringence. The radiation fields oscillating in the laser resonator are not subjected to polarization selection, and only the radiat... | 06/22/2004 |
| 6724797 | External cavity laser with selective thermal control A laser apparatus wherein a gain medium and an optical output assembly are mounted on a common, thermally conductive substrate which provides selective thermal control of the gain medium and output components on the substrate while avoiding unnecessary thermal contr... | 04/20/2004 |
| 6707518 | Electro-optic device allowing wavelength tuning Surface textures embossed in a substrate such as plastic include surface depressions or cones having equally-spaced, reflective terraced steps to support coherent reflections of incident light. A desired color or bandwidth of coherent reflected light off the terrace... | 03/16/2004 |
| 6693922 | Reeder rod The inventive rod includes a gain medium having first and second equal length portions sharing a common optical axis and an optical rotator disposed between said first and second portions which optical rotator compensates for birefringence. In an exemplar... | 02/17/2004 |
| 6683894 | Tunable IR laser source for MALDI A diode pumped solid state laser/OPO system widely tunable in mid infrared spectrum for infrared matrix assisted laser desorption/ionization (MALDI) mass spectroscopy is disclosed. Up to a few tens of milli-Joule, short pulse, tunable near infrared laser ... | 01/27/2004 |
| 6683902 | Semiconductor laser module The present invention provides a semiconductor laser module. A semiconductor laser module (1A) comprising a semiconductor laser element (2a) and an optical fiber (3a) optically coupled by an optical coupling means (2b) is provided, wherein on the optical ... | 01/27/2004 |
| 6667995 | ultrashort pulse laser oscillator For the sake of no needing to provide a mechanically actuating section such as a rotating mechanism thereby to be capable of realizing stable ultrashort pulse laser oscillation, an ultrashort pulse laser oscillator comprises a laser resonator composed of ... | 12/23/2003 |
| 6661941 | Frequency locking of tunable lasers by using a birefringent optical cavity Techniques and systems for monitoring a difference between the frequency of a laser and a resonance of a birefringent optical resonator. A feedback control loop may be used to lock the laser to the resonator, or alternatively, to lock the optical resonato... | 12/09/2003 |
| 6658029 | Laser beam-generating apparatus A deep-ultraviolet violet laser beam which is a harmonic and is generated inside a nonlinear optical element (101) is emitted outside the nonlinear optical element (101), being spaced from a green laser beam, which is a fundamental wave. The green laser b... | 12/02/2003 |
| 6647029 | Variable-wavelength semiconductor laser device controlled by strength of electric field applied to wavelength selection element A variable-wavelength semiconductor laser device containing a tapered-stripe semiconductor laser amplifier and a wavelength selection unit. Light emitted from a back end surface of the tapered-stripe semiconductor laser amplifier is incident on the wavele... | 11/11/2003 |
| 6643314 | Phase locked free electron laser with rational mode locking A compound intercavity interferometer for a free-electron laser (FEL) comprising at least two beam splitters positioned at a predetermined angles with respect to optical pathways. It is emphasized that this abstract is provided to comply with the rules re... | 11/04/2003 |
| 6560246 | Brillouin/erbium fiber laser current monitor using elliptically polarizing fiber A laser arrangement comprising a ring cavity at least two gain portions in said ring cavity, an input-output coupling connected to said ring cavity, a discriminator means connected in said ring cavity and adapted to discriminate between a pumping signal a... | 05/06/2003 |
| 6526073 | CW far-UV laser system with two active resonators A laser system includes a travelling-wave active laser-resonator arranged for generating laser-radiation having a first wavelength and arranged such that the first-wavelength radiation circulates in only one direction therein. An optically-nonlinear eleme... | 02/25/2003 |
| 6510170 | System and method for amplification of a laser beam The invention provides a laser system for producing a high energy amplified laser beam output from an oscillator producing a wave front of low energy laser beam, the system including at least one amplifier positioned to receive the low energy laser beam f... | 01/21/2003 |
| 6466598 | F2-laser with line selection An F2 -excimer laser has multiple closely-spaced spectral lines of interest around 157 nm, and one of the lines is selected by wavelength selection optics. The wavelength selection optics of a first preferred embodiment include a birefringent B... | 10/15/2002 |
| 6441972 | Optical image separator An optical assembly divides a single image into a plurality of images which are simultaneously projected onto a single sensor array. The optical assembly is arranged so that each of the plurality of images can be made to pass through a filter of a differe... | 08/27/2002 |
| 6393039 | Double-pass polarization diversified birefringent filter A double-pass birefringent filter apparatus comprises an external-interface apparatus (illustratively including of a beam-displacer element and a waveplate element); a birefringent filter comprised of a series of several birefringent waveplates; and a wra... | 05/21/2002 |
| 6370168 | Intracavity frequency-converted optically-pumped semiconductor laser An intracavity, frequency-doubled, external-cavity, optically-pumped semiconductor laser in accordance with the present invention includes a semiconductor multilayer surface-emitting gain-structure surmounting a Bragg mirror. An external concave mirror an... | 04/09/2002 |
| 6320894 | High energy Q-switched 0.9 μm laser A Q-switched neodymium laser may be operated in the 0.9 μm [( λ1)] band at relatively high gain levels. The laser uses a birefringent filter which provides selective discrimination for wavelengths near 1 μm [(λ2)] and prevents pa... | 11/20/2001 |
| 6317450 | Reeder compensator A thermal birefringence compensator for a double pass laser system, which includes a polarization or conventionally outcoupled laser resonator, a gain medium and a compensator optically coupled to the gain medium. In one implementation, the compensator, w... | 11/13/2001 |
| 6304583 | Utilization of telluride quaternary nonlinear optic materials A solid state laser device made from a nonlinear optic quaternary alloy of Silver, Gallium, Selenium and Tellurium semiconductor material or Silver, Gallium, Sulfur and Tellurium semiconductor material. The Tellurium component in each alloy provides quate... | 10/16/2001 |
| 6285705 | Solid-state laser oscillator and machining apparatus using the same In a resonating-type solid-state laser oscillator including a birefringent solid-state element containing a laser active medium and providing a plurality of thermal lenses during excitation and reflecting mirrors arranged oppositely to each other on both ... | 09/04/2001 |
| 6233371 | Optical fiber polarization controller An optical fiber polarization controller which has compact size by employing wave plates made of short sections of a first optical fiber having inherent birefringence such as a polarization maintaining optical fiber. In the control of the polarization sta... | 05/15/2001 |
