Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 6788727 | Method and apparatus for tunable wavelength conversion using a bragg grating and a laser in a semiconductor substrate Embodiments of a method and apparatus for tunable wavelength conversion using a Bragg grating and a gain medium disposed in a semiconductor substrate are disclosed herein. In one embodiment, an input optical signal corresponding to a first wavelength and modulated w... | 09/07/2004 |
| 6788725 | Semiconductor laser device An n-InP second upper cladding layer is laid on a p-InP lower cladding layer while an active layer having upper and lower boundary surfaces that are uniformly flat in an optical waveguide direction is interposed therebetween. A diffraction layer having a phase-shift... | 09/07/2004 |
| 6788718 | Implementation of ultrahigh frequency emitters and applications to radar and telecommunications The invention concerns an ultrahigh frequency emitting device, having: at least a first and a second microlaser (22, 24), emitting at two different frequencies ω1 and ω2, means of slaving the first and the second microlas... | 09/07/2004 |
| 6785320 | Control of polarisation of vertical cavity surface emitting lasers A vertical cavity surface emitting laser (VCSEL) comprising a one dimensional grating structure configured to act as a waveguide, preferably located at an end surface of the VCSEL, for selectively reflecting more of a first polarisation of light back into the cavity... | 08/31/2004 |
| 6785304 | Waveguide device with mode control and pump light confinement and method of using same A waveguide device in the form of either a solid-state laser or amplifier is divided into separate pumping and output mode control sections along at least one direction of the device by leaving a portion of a core of the device unclad or by depositing appropriate co... | 08/31/2004 |
| 6778584 | High power gas discharge laser with helium purged line narrowing unit A helium purge for a grating based line narrowing device for minimizing thermal distortions in line narrowed lasers producing high energy laser beams at high repetition rates. Applicants have shown substantial improvement in performance with the uses of helium purge... | 08/17/2004 |
| 6775427 | Laterally coupled wave guides A system capable of creating multiple beams of light using laterally coupled waveguides. Each beam is of a different central wavelength, capable of being generated on chip and coupled into a single fiber, and emitted from a single outcoupling grating (OCG). The pres... | 08/10/2004 |
| 6775306 | Directly pivotable grating for agile laser tuners Apparatus and method of providing an easily aligned directly pivotable grating suitable for high power agile wavelength laser tuners. A mounting and adjustment plane (26) is located on a rotational axis (28) and on a grating (27). An external ad... | 08/10/2004 |
| 6768750 | Multi-spectral line Raman laser A multiple spectral line Raman laser having adjustable relative power output between different spectral lines is provided. The laser includes a lasing cavity, first and second reflectors optically coupled to a back end of the cavity that reflects substantially all l... | 07/27/2004 |
| 6765945 | Injection seeded F2 laser with pre-injection filter A narrow band F2 laser system useful for integrated circuit lithography. An output beam from a first F2 laser gain medium is filtered with a pre-gain filter to produce a seed beam having a bandwidth of about 0.1 pm or less. The seed beam is amp... | 07/20/2004 |
| 6763054 | Optical system for improving the brightness of a stack of lensed diode lasers The optical system includes a stack of lensed, AR-coated laser diode bars and optics to brighten the stack's output. A spatial filter forces each bar to lase in one or a few high-order modes having two strong emission lobes. Radiation in the first lobe is passed to ... | 07/13/2004 |
| 6763044 | Tuning a laser The invention relates to a method of tuning a laser, comprising the steps of: providing a laser beam to an external cavity, the laser beam traveling through material along a path between a cavity end element and a tuning element, the path having an optical path leng... | 07/13/2004 |
| 6762881 | Optical arrangement, Littrow grating for use in an optical arrangement and also use of a Littrow grating An optical arrangement has a light source which emits coherent light of a specific wavelength. Further provided is an optical Littrow grating, arranged at a specific Littrow angle θL. It has a multiplicity of parallel diffraction structures following one... | 07/13/2004 |
| 6760359 | Grating-outcoupled surface-emitting lasers with flared gain regions A laser system comprises a laser diode with an active region and reflectors at both ends. An outcoupling aperture is located between the reflectors to couple light out of the device through the surface. The gain region increases in width as it nears the outcoupling ... | 07/06/2004 |
| 6757462 | Bragg grating filter optical waveguide device The present invention relates to a Bragg grating filter optical waveguide device, comprising an optical fiber provided with a Bragg grating region which is externally strained to alter the range of chirping. The external strain is induced by a gradient-generating me... | 06/29/2004 |
| 6744791 | Rare earth-doped medium with photorefractive grating as compact laser source A compact, broadband laser source is realized by using a rare earth dopant to define a laser gain spectrum and by using holographic imprinting techniques to form a wavelength selection element for selecting a particular wavelength from within the gain spectrum. Arti... | 06/01/2004 |
| 6741630 | Ridge waveguide distributed feedback laser A ridge waveguide distributed feedback laser includes a p-type InGaAsP grating layer having a p-type carrier density ranging from 1.5×1018 cm−3 to 4.0×10−3 cm−3 and preferably from 2.0×1018 cm−3 ... | 05/25/2004 |
| 6741631 | Customizable apodized chiral fiber grating apparatus and method A apodized chiral fiber grating consists of a chiral fiber with a variable effective grating strength along different regions of its length, such that the effective grating strength gradually increases from one end of the chiral fiber until a peak effective grating ... | 05/25/2004 |
| 6738410 | Line narrowed laser with bidirection beam expansion A grating based line narrowing unit with bi-directional beam expansion for line narrowing lasers. In a preferred embodiment a beam from the chamber of the laser is expanded in the horizontal direction with a three-prism beam expander and is expanded in the vertical ... | 05/18/2004 |
| 6735236 | High power gas discharge laser with line narrowing unit A grating based line narrowing device for line narrowing lasers producing high energy laser beams. Techniques are provided for minimizing adverse effects of hot gas layers present on the face of the grating. In preferred embodiments a stream of gas is directe... | 05/11/2004 |
| 6731666 | Laser device A laser device capable of efficiently oscillating laser light and always obtaining a stable beam form is provided. For this purpose, in the laser device including an amplifying section (18) in which a laser medium is amplified to oscillate laser light (11 | 05/04/2004 |
| 6728290 | Current biased dual DBR grating semiconductor laser A laser heterostructure having an active layer, a lateral waveguide terminating in an output aperture, and a gain section with a current drive electrode. A rear surface distributed Bragg grating with a tuning current electrode is formed on a surface of said laser he... | 04/27/2004 |
| 6727598 | Thermally tunable system An improved thermally tunable system is provided. The improved thermally tunable system includes a thermally tunable apparatus including a first portion and a second portion, a heater configured to thermally tune the apparatus, and a heat sink disposed adjacent to t... | 04/27/2004 |
| 6728274 | Multi-wavelength laser apparatus and method A fiber-optic laser source capable of emitting multiple useful wavelengths at the same time, including multiple ITU grid wavelengths, is disclosed. The laser preferably comprises a diode-pumped rare-earth doped fiber amplifier as gain medium, a periodic filter to de... | 04/27/2004 |
| 6724799 | Wavelength tunable laser light source A wavelength tunable laser light source necessary for a Wavelength Division Multiplexing (WDM)-based optical communication system, and more particularly, a wavelength tunable laser light source for maintaining a stable wavelength without a wavelength locker is provi... | 04/20/2004 |
| 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 |
| 6707832 | Fiber coupling enhancement via external feedback The present invention provides for the coupling of laser diodes into electromagnetic radiation transmitting fibers wherein coupling efficiency is improved by improving the spatial brightness of multi-mode diode lasers as they are coupled into double-clad fibers. A B... | 03/16/2004 |
| 6707072 | Semiconductor laser module A semiconductor laser module in which an exciting laser beam output is always allowed to be in a multi-mode and the variation of optical output does not occur. In the semiconductor laser module, a semiconductor laser device, light coupling means and an optical fiber... | 03/16/2004 |
| 6704335 | Light-emitting device An edge-emitting type light-emitting device (11000, 14000) comprises an organic light-emitting layer (40), a pair of electrode layers (30) and (50) for applying an electric field to the organic light-emitting layer (40), and an optical waveguide which tra... | 03/09/2004 |
| 6704342 | Gain-coupled distributed-feedback semiconductor laser device A gain-coupled DFB semiconductor laser device has a resonator and a diffraction grating which feeds-back the emission from the resonator to increase wavelength selectively. The gain-coupled coefficient .kappa.g and the length Lg of the diffract... | 03/09/2004 |
| 6700915 | Narrow band excimer laser with a resonator containing an optical element for making wavefront corrections A gas discharge laser system for generating a laser beam, such as an excimer or molecular fluorine laser system, includes a laser resonator with an optical element for making wavefront corrections such as an adaptable optical element, a phase conjugating ... | 03/02/2004 |
| 6697414 | Light emitting apparatus A light emitting apparatus has a light generating portion, an output, and an optical isolator. The light generating portion includes a semiconductor optical amplifier and a grating fiber. The semiconductor optical amplifier has a light emitting surface an... | 02/24/2004 |
| 6697411 | Modulatable multi-wavelength semiconductor external cavity laser A multi-wavelength external cavity laser system is disclosed, wherein an array of individual laser elements is placed in a shared laser cavity for all wavelengths that is defined by a free space grating, an optional reflector, and a single relay lens. Las... | 02/24/2004 |
| 6693946 | Wavelength-tunable lasers A semiconductor laser includes first and second laser cavities. The first and second cavities share a common optical gain medium and lase at different wavelengths.... | 02/17/2004 |
| 6693923 | Waveguide laser source A Bragg Grating optical waveguide laser source comprising at least one Bragg grating in a rare earth doped waveguide and an optical pump source coupled to said doped waveguide, said Bragg gratings having at least two different peak reflection wavelengths ... | 02/17/2004 |
| 6690688 | Variable wavelength semiconductor laser and optical module A wavelength-tunable semiconductor laser includes a semiconductor substrate; an optical waveguide on an upper surface of the semiconductor substrate; a front light reflection area including an SG-DBR mirror with repeating pairs of a diffraction grating po... | 02/10/2004 |
| 6690689 | Apparatus and method for compensating for age induced wavelength drift in tunable semiconductor lasers The present invention provides a method and apparatus for compensating for the age induced wavelength drift in a tunable DBR. In practice, the tuning characteristic (i.e. output wavelength versus tuning current) of a tunable DBR may be characterized befor... | 02/10/2004 |
| 6690873 | Method and apparatus for waveguide optics and devices Optical structures and method for producing tunable waveguide lasers. In one embodiment, a waveguide is defined within a glass substrate doped with a rare-earth element or elements by ion diffusion. Feedback elements such as mirrors or reflection gratings... | 02/10/2004 |
| 6687275 | Resonating cavity system for broadly tunable multi-wavelength semiconductor lasers A resonating cavity system of a tunable multi-wavelength semiconductor laser. The system has a laser, a collimating lens, a grating, a slit plate, and adjustable mirrors. The laser has two ends. The first end is coupled to the cavity, and the second end o... | 02/03/2004 |
| 6687267 | Widely tunable laser A tunable laser having a tunable multi-mode interference (MMI) section is provided. The tunable laser also includes a gain section including an active waveguide, a phase section including a transparent waveguide, and a sampled grating section including a ... | 02/03/2004 |
