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7633982 |
Optically pumped surface emitting semiconductor laser device
A surface emitting semiconductor laser device, having at least one monolithically integrated pump radiation source ( 20 ), in which the pump radiation source ( 20 ) has at least one edge emitting...
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7623559 |
Optical device, laser beam source, laser apparatus and method of producing optical device
After forming domain inverted layers 3 in an LiTaO 3 substrate 1 , an optical waveguide is formed. By performing low-temperature annealing for the optical wavelength conversion element thus...
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7608806 |
Multiple parameter laser power control with automatic compensation
A method and apparatus is disclosed for optic signal power control to maintain a desired or optimum optic signal power level. During start-up, a default or target value from memory may be utilized...
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7602822 |
Fiber laser based production of laser drilled microvias for multi-layer drilling, dicing, trimming of milling applications
Fiber lasers and methods for constructing and using fiber lasers for micro-/nano-machining with output beams including stacked pulses and combinations of continuous wave, pseudo-continuous wave and...
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7593438 |
Driving method for laser light source device, laser light source device, image display device, monitor device, and illumination device
A driving method for laser light source device includes: providing a laser light source device including a laser light source, a wavelength conversion element converting the wavelength of the light...
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7586961 |
Laser systems
A laser system 1 comprises six solid state diode laser modules 37.1 to 37.6 whose output beams are directly coupled into beam steering devices 38.1 to 38.6 and thereby routed to laser...
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7567600 |
Laser diode driver and N-wavelength optical pickup including the same
A laser diode driver for driving laser light sources of a N-wavelength optical pickup capable of recording on and playing N types of optical discs by using N laser beams having different...
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7564881 |
Optical transmission module with digital adjustment and the adjusting method
The invention discloses an optical transmission module with digital adjustment and method thereof. The module includes a laser ( 21 ), a laser driver ( 22 ), an automatic power adjustment circuit (...
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7548570 |
Laser power control apparatus
In a laser power control apparatus for controlling a laser power of a combination drive, first laser light Lc applied onto a first optical disk and second laser light Ld applied onto a second...
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7542492 |
Controlled misalignment in wavelength-converted laser sources
Methods of controlling semiconductor lasers are provided where the semiconductor laser generates an output beam that is directed towards the input face of a wavelength conversion device. Particular...
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7508856 |
Laser light output control apparatus and image forming apparatus
One aspect of the present invention can include a laser light output control apparatus having a plurality of laser light output control systems including a laser light source capable of receiving...
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7502394 |
System and method for modulating a semiconductor laser
Both a system and method are provided for modulating the intensity of an output beam generated by semiconductor laser. The exemplary system includes a source of pulsating current connected to the...
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7483455 |
Control method and control circuit for laser diode, and optical transmitter using the same
A control method for a laser diode is conducted such that optical output and OMA (optical modulation amplitude) or extinction ratio of the laser diode are controlled while modulating the optical...
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7474679 |
Laser apparatus and manufacturing method of thin film transistor using the same
A laser apparatus comprises a laser generating unit, and an intensity pattern regulating unit including a pair of blocking parts and a pair of semi-through parts, wherein the pair of semi-through...
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7468996 |
External cavity laser tuning element dither servo control
According to embodiments of the present invention, an external cavity laser includes one or more tuning elements. At least one modulated voltage signal or dither is used to lock the transmission...
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7457332 |
Laser power control unit and method for performing auto power control
A laser power control unit used for controlling the laser power of an optical pick-up unit (OPU) is provided. The laser power control unit includes: at least one analog-to-digital converter (ADC)...
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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...
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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...
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7418016 |
Method and apparatus for modifying the spread of a laser beam
An apparatus and method for modifying the spread of a laser beam. The apparatus comprises a laser source operable to generate a laser beam having a flux that exceeds a predetermined value and an...
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7400659 |
Method and device for performing DBR laser wavelength modulation free of thermal effect
The present invention is directed to a method and system for providing a three-level current scheme to a semiconductor laser to control beam wavelength and laser temperature. A first current is...
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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...
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7362784 |
Laser irradiation method, laser irradiation apparatus, and semiconductor device
An object of the present invention is obtaining a semiconductor film with uniform characteristics by improving irradiation variations of the semiconductor film. The irradiation variations are...
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7359649 |
Infrared transmitter circuit and electronic device
An infrared transmitter circuit causes an output current to flow to a light emission diode via a current mirror circuit constituted of three transistors by using a current supplied from a power...
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7345513 |
Driver circuit with automatic offset compensation of an amplifier and method for offset compensation of an amplifier of a driver circuit
A driver circuit is provided, which includes a differential amplifier whose output signal controls the driving input signal, a reference signal generator that supplies a reference input of the...
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7298977 |
Optical transmitter
The present invention is intended to prevent a light-emitting diode from emitting light continuously in the case when the level at an input terminal is fixed high because of software or the like...
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7294816 |
LED illumination system having an intensity monitoring system
A light source and method for controlling the same. The light source includes a first component light source that includes N LEDs, a photo-detector, and a collector, where N>1. Each LED has a...
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7282706 |
Advanced optics for rapidly patterned laser profiles in analytical spectrometry
The present invention is directed to a novel arrangement of optical devices for the rapid patterning of laser profiles used for desorption and/or ionization sources in analytical mass spectrometry....
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7184614 |
Method and apparatus for improving safety during exposure to a monochromatic light source
A method and apparatus are disclosed for improving bodily safety during exposure to an eye hazardous monochromatic treatment light source by diverging the light, such as with a diffusing unit...
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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...
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7123844 |
Optical computational system
In optical filter systems and optical transmission systems, an optical filter compresses data into and/or derives data from a light signal. The filter way weight an incident light signal by...
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7095763 |
Semiconductor wafer carrier mapping sensor
An improved laser-based wafer carrier mapping sensor is provided. The sensor includes a number of improvements including laser source improvements; optical improvements; and detector improvements....
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7095762 |
Laser irradiation method, laser irradiation apparatus, and semiconductor device
An object of the present invention is obtaining a semiconductor film with uniform characteristics by improving irradiation variations of the semiconductor film. The irradiation variations are...
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7075956 |
Optical semiconductor device
An optical semiconductor device comprises: an optical semiconductor element; and a circuit. The circuit is connected to the optical semiconductor element and has a series rectifying circuit...
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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...
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7024864 |
Bipolar current source based on a unipolar power supply
An adjustable bipolar current source for a load, such as a thermoelectric cooler, includes a voltage-controlled power supply having a unipolar output, and an H-bridge. At least one of the two...
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7002128 |
Laser diode driving circuit with safety feature
The invention relates to a feedback loop for a laser diode driving circuit for ensuring that the laser diode generates optical power at a constant safe level. The feedback loop includes a monitor...
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6989520 |
Emission control apparatus with settable target intensity and image forming apparatus using same
There is provided an emission control apparatus with which it is capable of variably controlling the intensity of a light beam to be set, in a stable manner and at a low cost without increasing the...
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6975813 |
Light output control device
Using a switching signal from a coarse/fine switching and operation mode switching circuit, the width of change of a counter control value during power up is increased, and the width of change is...
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6922420 |
Method of controlling hardening with laser beam and laser beam hardening device
A workpiece is irradiated by a laser beam scanned in an oscillating track as the workpiece is advanced along a feed path in a hardening process. Sinusoidal variations in scan velocity are offset by...
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6894314 |
Optical power monitoring for a semiconductor laser device
A power monitoring arrangement for semiconductor light emitting devices used in optoelectronic packages includes a mounting structure, a light emitting device, and a monitor photodetector. The...
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6885684 |
Laser control circuit and laser module
A laser control circuit comprises a temperature control circuit and a data processing circuit. The temperature control circuit adjusts the temperature of a laser diode by controlling a temperature...
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6872913 |
Marking of articles to be included in cans
A laser unit, which provides markings on a surface of a continuous strip of metal, includes a laser for generating a beam of laser radiation. The laser unit further includes a lens arrangement for...
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6870863 |
Methods of controlling a laser in a WDM application
A laser used in a DWDM optical-fiber application is controlled so that, before it is powered up or down, its output power is maximally attenuated, the result being minimal cross-channel...
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6839366 |
Laser frequency control using dithered control signal
A dithering signal is superimposed on a laser frequency control signal. In this way, laser frequency control may be achieved by employing measurements from a single photodetector. By sampling...
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6827502 |
Twin VCSEL array for separate monitoring and coupling of optical power into fiber in an optical subassembly
The present invention provides a two VCSEL array mounted in a single can with a monitoring diode. One VCSEL is directed toward the can window (for coupling with an attached fiber optic in a...
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6807202 |
Process for stabilizing the optical output power of light-emitting diodes and laser diodes
The invention relates to a method that can be used to compensate the influence of the temperature on the optical output power (light power) of light emitting diodes and laser diodes without the...
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6795656 |
Optical transmission circuit using a semiconductor laser
An optical transmission circuit includes: a semiconductor laser; a drive circuit for supplying drive current to the semiconductor laser; a duty changing circuit for changing a duty value of an...
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6778566 |
System and method for testing a laser module by measuring its side mode suppression ratio
A key requirement of a fiber optic communication system is its ability to transmit data from one location to another relatively free of errors in the data stream. The data stream error rate is a...
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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...
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6738398 |
SHG laser light source and method of modulation for use therewith
The invention provides an SHG laser light source whose optical output can be modulated using a simple mechanism without having to equip the light source with an external modulator, and a method of...
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