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| Number | Title | Issue Date |
| 7809032 | Control method of distributed Bragg reflection semiconductor laser, and image projecting apparatus A DBR semiconductor laser is controlled in an image projecting apparatus, which includes the DBR laser having a phase and DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR laser into second harmonic wave ligh... | 10/05/2010 |
| 7440478 | Laser beam path length difference detector, laser phase controller, and coherent optical coupler Provided are a small-sized, low-cost, and easy-to-use laser optical path length difference detecting device, a laser optical path length difference detecting device, and a coherent optical coupling device. The laser optical path length difference detecting device de... | 10/21/2008 |
| 7440174 | Coherent fiber diffractive optical element beam combiner An optical beam combiner and a related method for its operation, in which multiple coherent input beams are directed onto a diffractive optical element (DOE) along directions corresponding to diffraction orders of the DOE, such that the DOE generates a single output... | 10/21/2008 |
| 7436871 | Method and device for performing wavelength modulation with Distributed Bragg Reflector (DBR) laser The present invention is directed to a method and system for providing phase modulated current to a semiconductor laser to control beam wavelength. A first current is received into a gain portion of the semiconductor laser and a second current is received into a DBR... | 10/14/2008 |
| 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 |
| 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 |
| 7242701 | Laser wavelength control arrangement and method Wavelength control and stabilization of a laser is achieved by a practical, inexpensive, and accurate technique adapted for most optical transmission system applications by a method involving a laser characterization phase and a laser wavelength control and stabiliz... | 07/10/2007 |
| 7221499 | Frequency scanned array control system An optical fiber amplifier array and related method, in which high beam quality is achieved by varying the frequency of an input signal applied to all of the fiber amplifiers, to locate a frequency at which the amplifiers produce nearly coherent optical outputs. In ... | 05/22/2007 |
| 7171127 | Optical transmission controller An optical transmission controller includes a semiconductor-laser, a semiconductor laser driver, a monitor photoreceptor, a waveform detector and a phase relation adjuster. The semiconductor laser driver allows the semiconductor laser to output an optical signal. Th... | 01/30/2007 |
| 7139295 | Tunable wavelength locker, tunable wavelength spectrum monitor, and relative wavelength measurement system A system for tuning the wavelength of a beam from a tunable laser. A tunable etalon assembly includes a Fabry-Perot etalon with paired reflectors to filter the laser beam. The tunable etalon also includes a thermal unit to thermally adjust the separation of the pair... | 11/21/2006 |
| 7133427 | Phase conjugate laser and method with improved fidelity A spatial filter adapted to increase the angular spread of non-conjugated energy in a beam and suppress this energy to improve the efficiency of a phase conjugate system. In the illustrative embodiment, the filter includes first and second lenses and an aberrator to... | 11/07/2006 |
| 7130322 | Wavelength tunable laser and method of controlling the same There is provided a phase control portion for controlling phase of a laser beam resonated in a resonator based on detected results by two optical detectors. The phase control portion adjusts the longitudinal mode positions by a feedback control so that a ratio of in... | 10/31/2006 |
| 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 |
| 7110171 | Relay telescope including baffle, and high power laser amplifier utilizing the same A laser system includes an optical path having an intracavity relay telescope with a telescope focal point for imaging an output of the gain medium between an image location at or near the gain medium and an image location at or near an output coupler for the laser ... | 09/19/2006 |
| 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 |
| 7065111 | Method for testing laser using side mode suppression ratio Systems, methods and computer software are provided for testing a laser. Initially, the laser is operated at a first bias setting and a data rate of about 10 Gb/s, and a first side mode suppression ratio of the laser output is measured that is based on a first ratio... | 06/20/2006 |
| 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 |
| 7054511 | Optical coupling device for single mode optical fibers A device for coupling incident radiation to a single mode fiber optic a solid state interferormeter having a front end similar to a Mach-Zehnder integrated interferometer and a back end formed by two converging radiation channels converging at an angle θ and termin... | 05/30/2006 |
| 6954476 | Sampled grating distributed Bragg reflector laser controller A controller for use with sampled grating distributed Bragg reflector (SGDBR) lasers is presented. An exemplary controller includes a table of settings representing a control surface, each setting corresponding to a separate operating point of the SGDBR laser, a fir... | 10/11/2005 |
| 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 |
| 6795459 | Light frequency locker A light frequency locker (10) able to accept a light beam (14) generated by a controllable light source (12) into a light diverter (16) and impart to it a transverse displacement characteristic which can be detected in a light detection u... | 09/21/2004 |
| 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 |
| 6693931 | Method and system for phase stabilization The invention relates to an improved method and system for synchronizing signals in a particle accelerator system. In one embodiment, a method and system is disclosed whereby a phase of laser pulses are monitored, and a high-frequency signal is adjusted a... | 02/17/2004 |
| 6539036 | Laser control loop with automatic adaptation to the monitoring signal polarity The invention relates to a method and a circuit arrangement for a laser control loop with automatic adaptation to the monitoring signal polarity. Use is made of a single-phase method which consists in that a signal produced by the monitor during the start... | 03/25/2003 |
| 6480327 | High power laser system with fiber amplifiers and loop PCM An optical system for producing high power laser beams has an in/out coupler for receiving an input laser beam from an oscillator. The coupler inputs the beam to a first multiplexer which produces a plurality of beams which are sent to a plurality of fibe... | 11/12/2002 |
| 6359915 | Wavelength-stabilized Bragg laser A stabilized single-longitudinal-mode laser where stabilization is performed through a pair of Bragg reflector mirrors slightly displaced in wavelength to either side of the longitudinal mode selected for operation. Transmitted signals through each Bragg ... | 03/19/2002 |
| 5459604 | Coherent switch of currents in semiconductors A method and apparatus is provided for propagating photoelectrons in a semiconductor material and for controlling the direction of photoelectrons produced in a semiconductor material. A selected region of the semiconductor material is irradiated with two ... | 10/17/1995 |
| 5430748 | Laser system with phase-conjugator-enhanced output A laser system includes a linear array of broad area lasers. Such a laser source produces a beam that has a polarization axis in the direction in which the array extends and a coherency axis orthogonal to that. The laser is injection locked by phase conju... | 07/04/1995 |
| 5317441 | Transceiver for full duplex signalling on a fiber optic cable A full duplex optical signal transmission system comprising a pair of transceivers interconnected by means of a single fiber optic cable is provided with an optical receiver for detecting transmitted and received optical signals and a delay and compensati... | 05/31/1994 |
| 5126876 | Master oscillator power amplifier with interference isolated oscillator A master oscillator power amplifier (MOPA) system which isolates the master oscillator (MO) from the return amplified beam by dividing the return beam into two components, introducing a phase shift between the components, and recombining the phase shifted... | 06/30/1992 |
| 4896325 | Multi-section tunable laser with differing multi-element mirrors An improvement for allowing selective tuning of the emitted beam over a broad bandwidth to a diode laser having an active section for creating a light beam by spontaneous emission over a bandwidth around some center frequency and for guiding and reflectin... | 01/23/1990 |
