Class 372/29.023 - Phase

Subclass of Class 372 - Coherent light generators
Definition: Subject matter wherein a parameter or characteristic of
No. of patents: 78
Last issue date: 05/29/2012

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Number	Title	Issue Date
8189631	External resonator-type wavelength tunable laser device The present invention provides an external resonator-type wavelength tunable laser device that can properly fulfill a wavelength tuning function even with the use of a planar wavelength tunable reflector involving a considerable level of residual reflection. The ext...	05/29/2012
7933301	Resonator cavity configuration and method A resonator cavity (10A) and method are provided. The resonator cavity (10A) includes at least one gain medium (16) and end reflectors (12, 14) which define together longitudinal modes of light in the cavity, and further includes an intra...	04/26/2011
7929585	High brightness semiconductor laser diode arrays Systems and methods for high brightness, improved phase characteristics laser diodes. ...	04/19/2011
7924894	Digital piston error control for high-power laser system employing diffractive optical element beam combiner A high-power laser system includes a laser master oscillator, a plurality of fiber laser amplifiers producing intermediate output beamlets, a diffractive optical element for combining the intermediate beamlets into a combined output beam, and a piston error controll...	04/12/2011
7876796	Method and apparatus for coherently combining laser emission A laser system comprises first and second laser sub-cavities each including a gain medium arranged to produce volume gain gratings. The laser system further includes a beam combiner arranged to combine emission from each cavity and direct emission from one cavity to...	01/25/2011
7852888	Laser source with coherent beam recombination A laser source is disclosed with coherent recombination of N spatial monomode laser beams having N phase shifters controlled by a phase-lock device (3). The phase-lock device has an optical device (30) capable of taking at least a portion of each of th...	12/14/2010
7792164	Optical pulse generator for high power fiber amplifiers Systems and methods for pre-correcting accumulated optical nonlinear phase error in a shaped optical pulse derived from a continuous wave laser signal are provided. A continuous wave laser signal is received. A pulse signal is received. A shaped optical pulse is gen...	09/07/2010
7787505	Multi-longitudinal mode laser providing polarization control The present invention provides optical configurations, including resonant cavity and laser configurations, and related methods providing deterministic control of the polarization characteristics and frequencies of the radiant output of multi-longitudinal mode lasers...	08/31/2010
7742512	Scalable laser with robust phase locking A robust scalable laser. The laser includes plural fiber laser resonators. A cavity that is external to the fiber laser resonators combines plural laser beams output from the plural fiber laser resonators into a single output laser beam. In a specific embodiment, th...	06/22/2010
7620084	Methods and systems for laser diode control Methods and systems that enable the combining of laser diodes into a laser beam. ...	11/17/2009
7596157	Laser optical apparatus A laser optical apparatus which removes speckles from a screen by changing the phase of a laser beam so as to form an image having high visibility. The laser optical apparatus includes an incident unit on which a laser beam is incident; a multichannel connect...	09/29/2009
7555024	Resonator cavity configuration and method A resonator cavity (10A) and method and presented. The resonator cavity (10A) comprises at least one gain medium (16) and end reflectors (12, 14) which define together longitudinal modes of light in the cavity, and further comprises an in...	06/30/2009
7532651	Illumination system for optical modulators A phase plate and lens modify light beams emitted by an array of lasers to form an efficient illumination source for a MEMS light modulator array. The phase of the electric field emitted by the lasers is modified such that the after passing through a lens the beam p...	05/12/2009
7418017	Interferometer, in particular for determining and stabilizing the relative phase of short pulses A description is given of an optical structure (100), in particular for determining and stabilizing the relative phase of short pulses, which contains a broadening device (6) for broadening the frequency spectrum of pulses of electromagnetic radiation,...	08/26/2008
7366426	Optical add/drop multiplexer using tunable filter and method for feedback controlling the tunable filter A wavelength stabilizing filter has a wavelength transmission characteristic curve that has its peak in a wavelength located between a first continuous set band and a second continuous set band longer in wavelength than the first set band, and that linearly drops fr...	04/29/2008
7359412	Laser apparatus, laser irradiation method, and manufacturing method of semiconductor device It is an object to provide a laser apparatus, a laser irradiating method and a manufacturing method of a semiconductor device that make laser energy more stable. To attain the object, a part of laser beam emitted from an oscillator is sampled to generate an electric...	04/15/2008
7356056	Coherent light source and control method thereof, and display unit and laser display using them In a display device that displays a video by scanning coherent light across a screen, modulation at high speeds and gradation are necessary for a coherent light source. An oscillation wavelength of a semiconductor laser outputting the fundamental wave is chan...	04/08/2008
7346085	Multi-stage method and system for coherent diffractive beam combining A system or method coherently combines a large number of light beams at a single wavelength in multiple stages to form a high-power diffraction limited output beam. A two-stage system, or method based thereon, includes a master oscillator transmitting a light beam t...	03/18/2008
7342951	Laser diode with a frequency converter A semiconductor laser diode that internally converts one or more short wavelength “pump” beams to an output beam at a longer wavelength using nonlinear optical frequency conversion in the semiconductor. Modal phase matching of the pump and output beams in a semi...	03/11/2008
7324761	Single sideband optical transmitter Described are an optical transmitter and a method for generating a single sideband optical signal. The method includes generating a data signal at a first power level and at a second power level with a predetermined ratio being defined between the power levels. The ...	01/29/2008
7313158	Integrated high speed modulator for grating-outcoupled surface emitting lasers A single-mode grating-outcoupled surface emitting (GSE) semiconductor laser architecture is provided. This architecture enables high speed modulation of the GSE laser, which is accomplished by only varying the relative phase of counter propagating waves in the outco...	12/25/2007
7260125	Method of forming mirrors by surface transformation of empty spaces in solid state materials A multi-layered reflective mirror formed of spaced-apart plate-shaped empty space patterns formed within a substrate is disclosed. The plurality of plate-shaped empty space patterns are formed by drilling holes in the substrate and annealing the substrate to form th...	08/21/2007
7215383	Coherent light despeckling A display device or a receiver device for use with coherent light. A controller applies phase shift values to a multi-region phase array at a frequency sufficiently higher than the flicker fusion rate of the human eye or other intended receiver in order to remove th...	05/08/2007
7142571	Stack-type diode laser device Two thin-clad laser diodes are disposed to form a stack-type diode laser device. The diodes emit two beams that are substantially parallel and in proximity such that they share many fiberoptic systems designed for a single beam. The diodes are coupled by leaky waves...	11/28/2006
7127129	Method and apparatus for phase shifting an optical beam in an optical device An apparatus and method for high speed phase modulation of optical beam with reduced optical loss. In one embodiment, an apparatus includes a first region of an optical waveguide disposed in semiconductor material. The first region has a first conductivity type. The...	10/24/2006
7123634	Zig-zag laser amplifier with polarization controlled reflectors A solid state zig-zag slab laser amplifier in which depolarization occurring at total internal reflection from opposed lateral faces of the amplifier slab is controlled by selecting a complex evanescent coating that provides a selected phase retardance that results ...	10/17/2006
7092417	Method and apparatus for generating phase-correlation According to each embodiment of the present invention, a phase-correlation can be generated between respective laser fields produced by a plurality of independent lasers. Specifically, based on a structure that first and second laser fields each having a mixed quant...	08/15/2006
7088491	Pulse generating apparatus and method An apparatus and method generating an optical pulse of picosecond class (having a high duty ratio), which accurately and stably operates at an arbitrary repetition frequency, has a high OSNR, and is not restricted by an RF modulation frequency, are provided. New mod...	08/08/2006
7085297	Driving method and driving circuit of light source apparatus A driving method of a semiconductor laser having an active layer region, a phase adjustment region and a distributed Bragg reflector region includes the steps of: calculating an average value of multipulse modulation currents modulated between a peak current and a b...	08/01/2006
7058098	Self-synchronous locking of optical coherence by single-detector electronic-frequency tagging A coherent laser beam combining system wherein the output of a single master oscillator is split into a plurality of N signals, and the N signals are electronically modulated at unique frequencies. There is no reference signal and all of the signals are passed throu...	06/06/2006
6952435	Speckle free laser probe beam The present invention contemplates a method and apparatus to generate a laser probe beam free of speckles. The present invention employs a holographic phase plate inserted in a laser beam path to modulate the relative phase across the beam. The holographic phase pla...	10/04/2005
6920160	Laser resonators comprising mode-selective phase structures The invention relates to a laser resonator for semiconductor lasers having a waveguiding layer which is disposed between a substrate and a superstrate, the waveguiding layer, the substrate and/or the superstrate of the laser resonator having at least one phase struc...	07/19/2005
6904068	Semiconductor laser device and multiple wavelength laser light emitting apparatus employing the semiconductor laser device To provide a semiconductor laser device that is capable of outputting high power laser light and is suitable for optical recording, optical communication, welding, and the like, and a multiple wavelength laser light emitting apparatus employing the semiconductor las...	06/07/2005
6898216	Reduction of laser speckle in photolithography by controlled disruption of spatial coherence of laser beam Speckle of a laser beam is reduced by inserting an anti-speckle apparatus in the beam path to disrupt its spatial coherence while maintaining its temporal coherence. In one embodiment, the anti-speckle apparatus is a phase retarder plate bearing periodic optically-c...	05/24/2005
6865198	Cavity ringdown spectroscopy system and method One embodiment of the present invention includes an optical cavity, a source to provide light to the optical cavity, a sensor to detect the light and generate a corresponding sensor signal, and a servo device including a feedforward input and a feedback input. Feedb...	03/08/2005
6813286	Optical resonators with discontinuous phase elements A discontinuous phase element (86, 204) is disposed between the reflector (20, 23) elements of an optical resonator in order to suppress unwanted modes propagating within the cavity, and to preferentially allow the existence of preferred modes within t...	11/02/2004
6807201	Laser with phase controlling region and method for driving the same A laser includes a first region with a first moveguide having a first diffraction grating, a second region with a second waveguide having a second diffraction grating, and a phase controlling region with a third waveguide and a phase control unit for controlling an ...	10/19/2004
6807198	Laser device A Laser arrangement (1) comprising a pump unit (2) containing a pumped laser crystal (3), and means, such as a saturable absorber (15), for passive mode-locking, wherein two separate, alternatively switchable resonator arms (11, 12...	10/19/2004
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
6700905	Ultrawide-band light pulse generation A method of generating light pulses in an ultrawide band ranging from the near-infrared region to the near-ultraviolet region. Fundamental sub-picosecond pulses emitted from an ultrashort pulse laser (1) are passed through a nonlinear optical material (6)...	03/02/2004

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Class 372/29.023 - Phase