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| Number | Title | Issue Date |
| RE43422 | Tunable optical local oscillator A tunable optical local oscillator is used for optical heterodyne signal detection using an electrooptic Mach-Zehnder modulator to produce a rapidly tunable optical signal from a tunable RF frequency generator. A combination of the Mach-Zehnder modulator and optical... | 05/29/2012 |
| 8189630 | Quantum cascade laser suitable for portable applications A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use ... | 05/29/2012 |
| 8094693 | Laser control method and laser control circuit A laser control method includes the steps of: using a laser control circuit which includes a constant current circuit that maintains a constant current flowing through a semiconductor laser element, and which includes an adder and a multiplier connected to a stage p... | 01/10/2012 |
| 8073026 | Method and apparatus for controlling carrier envelope phase A chirped pulse amplification laser system. The system generally comprises a laser source, a pulse modification apparatus including first and second pulse modification elements separated by a separation distance, a positioning element, a measurement device, and a fe... | 12/06/2011 |
| 8000358 | Power monitoring system for a parallel optical transmitter A power monitoring system uses a low loss reflective element to partially split the output laser beams from an array of laser sources, in a parallel configuration, to produce a monitor beams for each laser source. Each of these monitor beams may propagate within the... | 08/16/2011 |
| 7995630 | High performance tunable lasers utilizing optical phase-locked loops This invention relates to opto-electronic systems using semiconductor lasers driven by optical phase-locked loops that control the laser's optical phase and frequency. Feedback control provides a means for precise control of optical frequency and phase, including th... | 08/09/2011 |
| 7920609 | Exposure device and circuit board for laser controller In an exposure device comprising a laser controller that is configured as a circuit board capable of independently being changed, and that controls the emission of laser light from a laser emitter emitting laser light on receipt of an instruction for control given f... | 04/05/2011 |
| 7920608 | Quantum cascade laser suitable for portable applications A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use ... | 04/05/2011 |
| 7899095 | Laser lithography system with improved bandwidth control A method and apparatus may comprise a seed laser, along with an amplifier laser amplifying the output of the seed laser. A bandwidth metrology module may provide a bandwidth measurement and a bandwidth error signal may be provided using a bandwidth set point. A diff... | 03/01/2011 |
| 7899096 | Methods and circuits for controlling drive mechanisms A method for aligning an optical package includes applying a dither waveform and an advancement waveform to a drive mechanism. The optical package includes a semiconductor laser operable to emit an output beam with a first wavelength, a wavelength conversion device ... | 03/01/2011 |
| 7894494 | Method and apparatus to control output spectrum bandwidth of MOPO or MOPA laser An apparatus and method which may comprise a seed laser defining an optical cavity producing an output. An amplifier may amplify the seed laser output. A bandwidth error signal generator may provide a bandwidth error signal from measured bandwidth and a target. A ba... | 02/22/2011 |
| 7848370 | Electronically phase-locked laser systems Semiconductor diode lasers are phase-locked by direct current injection and combined to form a single coherent output beam. The optical power is amplified by use of fiber amplifiers. Electronically control of the optical phases of each emitter enables power efficien... | 12/07/2010 |
| 7839906 | Laser power control in an optical disc drive Exemplary embodiments provide a method and system for controlling laser power in an optical disc drive. The exemplary embodiment of a control system includes at least one control component for generating a control signal; a plant for generating a control output resp... | 11/23/2010 |
| 7733928 | Quantum cascade laser suitable for portable applications A highly portable, high-powered infrared laser source is produced by intermittent operation of a quantum cascade laser power regulated to a predetermined operating range that permits passive cooling. The regulation process may boost battery voltage allowing the use ... | 06/08/2010 |
| 7711018 | Method and apparatus for laser diode compensation The luminance of a laser diode is a function of laser diode drive current. The luminance is also a function of other factors, such as age and temperature. A laser projection device includes laser diodes to generate light in response to a commanded luminance, and als... | 05/04/2010 |
| 7649919 | Automatic power control circuits and methods An automatic power control (APC) circuit applicable to controlling a laser generation module including a laser generator for generating laser and a photosensor for outputting a detection result corresponding to the power of the laser, includes: a comparator, coupled... | 01/19/2010 |
| 7620083 | Semiconductor laser drive system and semiconductor laser driving method A semiconductor laser drive system and a semiconductor laser driving method where both internal noise and optical feedback noise can be simultaneously reduced are provided at low cost and low power consumption. The semiconductor laser drive system in an optical pick... | 11/17/2009 |
| 7620082 | Method and apparatus for seeding and stabilizing an optical device A method for seeding and stabilizing an optical device, wherein the optical device includes one of a continuous wave laser, a pulsed laser, and a parametric system, the method including seeding the optical device with a seed signal, generating a feedback signal from... | 11/17/2009 |
| 7620081 | Semiconductor laser utilizing real-time linewidth reduction method A system for real-time linewidth reduction in an optical source includes a laser device comprising a back facet, wherein the laser device receives a modulated input current and generates an optical output signal; an etalon device disposed adjacent to the back facet ... | 11/17/2009 |
| 7583711 | Apparatus and method for stabilizing the frequency of lasers Method and apparatus are disclosed that enable lasers to be stabilized in absolute frequency to high precision. The principle of operation is to: 1) lock the laser frequency to an etalon transmission resonance, 2) phase modulate the laser beam at a frequency corresp... | 09/01/2009 |
| 7505492 | Alignment of lasing wavelength with wavelength conversion peak using modulated wavelength control signal According to one embodiment of the present invention, a programmable light source comprises one or more semiconductor lasers, a wavelength conversion device, and a laser controller. The controller is programmed to operate the semiconductor laser using a modulated fe... | 03/17/2009 |
| 7492795 | Ultralow noise mode-locked laser and RF sinewave source Systems, devices and methods of generating both a precision electrical timing signal as well as a precision optical timing signal. A novel, modified opto-electronic loop oscillator is used to drive a harmonic mode-locked laser. A novel opto-electronic loop has a lar... | 02/17/2009 |
| 7433375 | Laser trim and compensation methodology for passively aligning optical transmitter A method embodiment of the invention includes a scheme for trimming and compensation of a laser emitter in a fiber optic link. A laser emitter is provided. Also a reference optical power value is determined using data models of laser emitter performance generated by... | 10/07/2008 |
| 7423247 | Automatic control of laser diode current and optical power output An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensat... | 09/09/2008 |
| 7403215 | Current driver and power control for electrophotographic devices Laser driver systems and methods are provided for controlling a laser driver coupled to a suitable laser source. The laser driver comprises a plurality of current sources, including at least one bias current source and at least two switched current sources. To contr... | 07/22/2008 |
| 7400661 | Automatic setting of laser diode bias current Threshold current may be determined and one or more bias sources may be programmed in a laser drive circuit. For example, a laser diode emits light along first and second optical paths. A polarizer is positioned in the first optical path between the laser diode and ... | 07/15/2008 |
| 7379486 | Technique for optically pumping alkali-metal atoms using CPT resonances Systems and methods for optically pumping alkali-metal atoms using Coherence Population Trapping (CPT) resonances are disclosed. An illustrative push-pull optical pumping system for inducing CPT resonances in a resonance cell containing an admixture of alkali-metal ... | 05/27/2008 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 7369585 | Semiconductor based broad area optical amplifier An optical amplifier including: a photonic gain clement; and, a transistor electromagnetically coupled to the gain element to inject current into the gain element responsively to the internal optical intensity of the gain element. The coupling of the transistor and ... | 05/06/2008 |
| 7359414 | Excessive current input suppressing semiconductor laser light emitting circuit A semiconductor laser light emitting circuit includes a semiconductor laser diode emitting a laser light by modulating a current supplied thereto, a light intensity detection circuit that detects the laser light and generates a voltage, and a voltage-current convers... | 04/15/2008 |
| 7352786 | Apparatus for driving light emitting element and system for driving light emitting element In case of driving each of light emitting parts of a surface emitting laser, each of light emitting parts is made to be in forward-bias state and switches appropriately change bias voltage, which is lower than laser oscillation threshold voltage, and drive voltages,... | 04/01/2008 |
| 7352783 | Tunable fiber laser light source A loop is formed with an optical fiber by providing a gain medium having a gain with respect to an oscillation wavelength. Light retrieved by the optical circulator 13 from the optical fiber loop is enlarged and projected to a mirror 23. A diffraction ... | 04/01/2008 |
| 7352784 | Laser burst boosting method and apparatus Methods and apparatus for managing thermal loads on a laser gain medium and for boosting the output power of a diode pumped laser are disclosed. The short-term average pumping power to the gain medium is increased, to provide a burst of pumping energy to the laser g... | 04/01/2008 |
| 7346088 | Voltage dividing apparatus for preventing sudden increases in power to a laser diode A voltage dividing apparatus for preventing sudden increases in power to a laser diode includes a laser diode module, a laser-driving unit and a Zener diode. The laser diode module includes a laser diode for receiving a driving current to emit light, and a photo dio... | 03/18/2008 |
| 7342949 | Laser scanning device A laser scanning device includes a semiconductor laser that emits a laser beam, a laser power detector that detects laser beam power of the semiconductor laser, a reference voltage generator that generates reference voltage for controlling the laser beam power of th... | 03/11/2008 |
| 7321606 | Laser trim and compensation methodology for passively aligning optical transmitter A method includes a scheme for trimming and compensation for a laser emitter in a fiber optic link. Data models of laser performance are provided and used to determine a base power level. It is then confirmed that the base power level is satisfactory. If necessary, ... | 01/22/2008 |
| 7313156 | 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... | 12/25/2007 |
| 7304936 | Method and apparatus for controlling power of laser diode in optical disc drive A method of and an apparatus for controlling a power of a light emitter in an optical disc drive to stabilize a servo control operation by efficiently compensating a slow tail effect occurring in a photodiode monitoring outputs of the light emitter are provided. The... | 12/04/2007 |
| 7301520 | Image display device and driver circuit therefor There is provided an image display device operating in response to the input of digital picture signals, in which the occupied area of a signal line driver circuit thereof is reduced, and the parasitic capacitance and resistance of input transmission lines of the di... | 11/27/2007 |
| 7301976 | Method and apparatus for semiconductor laser driving capable of stably generating consistent optical pulse widths of laser diodes A semiconductor laser driving circuit includes a light amount detector, a frequency determiner, and an initialization circuit. The light amount detector detects an amount of light emitted by a laser diode, and outputs a first voltage corresponding to the amount of l... | 11/27/2007 |
