Class / Patent application number | Description | Number of patent applications / Date published |
372290010 | Having particular beam control circuit component | 86 |
20080291953 | Light-Emitting System Provided with an Integrated Control Photosensor and a Method for Producing Said System - Light-emitting system comprising an integrated control photodetector and method for fabricating said system. | 11-27-2008 |
20080317077 | Device and Method for Laser Safe Operation - A laser system ( | 12-25-2008 |
20090016390 | LIGHT SOURCE DEVICE, IMAGE DISPLAY APPARATUS, AND MONITOR APPARATUS - A light source device includes plural light-emitting elements that emit lights, a wavelength selection element that has plural light selection areas in which wavelength selection is performed for the lights emitted from the plural light-emitting elements, respectively, and selectively reflects a part of the lights emitted from the plural light-emitting elements, a state detecting unit that detects states of the plural light selection areas of the wavelength selection element, and a state changing unit that changes, according to the states of the plural light selection areas detected by the state detecting unit, the states of the light selection areas of the wavelength selection element to make wavelengths of the lights selected in the plural light selection areas different from one another. | 01-15-2009 |
20090059976 | LASER MODULE AND METHOD FOR ADJUSTING OPTICAL AXIS OF THE SAME - A laser module capable of easy optical axis adjustment between the very small waveguide in a short period of time, and a method for adjusting an optical axis thereof. The laser module includes a laser device LD; an optical waveguide device SHG equipped with a waveguide; lenses L | 03-05-2009 |
20090092161 | LASER POINTER WITH CONTROLLABLE PATTERN AND SIZE OF PROJECTED IMAGE - A laser pointer includes a human-machine interface disposed above the housing for users to control components inside the housing to decide patterns and size of the projecting image. The components consist of a frequency/phase control module, a driving energy control module, a laser beam generating module and a light scanning device. The frequency/phase control module controls the driving energy control module while the driving energy control module controls driving energy of the light scanning device. The size of the image is controlled by change of the amplitude of the light scanning device while the amplitude is changed along with the driving energy. The amplitude may also change along with the driving frequency. When the driving energy is fixed and the driving frequency is close to the resonant frequency, the amplitude increases. On the contrary, the amplitude decreases. | 04-09-2009 |
20090219961 | Laser Systems and Methods Having Auto-Ranging and Control Capability - Laser systems and methods having an ability to automatically adjust a laser output based on one or more of a state of an object detected within a field of view and a motion of the laser system are disclosed. | 09-03-2009 |
20090290607 | SIGNAL PROCESSING DEVICE FOR CONTROLLING LASER OUTPUT AND DEVICE FOR OBSERVING LASER ACTION PROCESS - The present invention relates to a signal processing device for controlling laser output and a device for observing laser action process. The device for observation includes a video camera for image acquisition and a monitor connected with the video camera, and it further includes a signal processing device for controlling laser output. A pulse signal of an electronic shutter of the video camera, after being processed by the signal processing device, is outputted to a controlling input port of a laser device. The signal processing device includes a control signal generating unit for generating a control signal according to the pulse signal of the electronic shutter by the image acquisition; a compression signal generating unit for compressing the pulse width of the generated envelope signal which is a signal for controlling the laser output according to the influence time on the image acquisition from the optical noise due to interaction between the laser and the material. The devices provided by the present invention can eliminate the high-brightness optical noise generated from the action between the laser and the material, and consequently the laser action process can be observed clearly. | 11-26-2009 |
20090304035 | LASER TRANSMITTER AND METHOD - A laser transmitter projects a beam of laser light outward while raising and lowering the beam. The beam may define a conical surface of varying inclination. The transmitter includes a laser source that directs a beam generally vertically, and a beam diverting element. The beam diverting element is positioned in the path of the beam, intercepting the beam and redirecting it. The beam emerges from the transmitter as a non-vertical beam that is raised and lowered. The diverting element may include a pair of mirrors configured as a pentaprism, with one of the mirrors pivotable. Alternatively, the diverting element may include a plurality of micro mirrors. Also, the diverting element may include a conical reflector and an annular lens which is cyclically raised and lowered. The beam may be raised and lowered cyclically according to a predetermined schedule, or it may be raised and lowered non-cyclically. | 12-10-2009 |
20100111121 | LASER GAIN MEDIUM AND LASER OSCILLATOR USING THE SAME - A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium. | 05-06-2010 |
20110211602 | Semiconductor Laser Using External Resonator - A semiconductor laser using an external resonator. A laser diode chip emits a laser beam in a horizontal direction parallel to the bottom plane of a package, and the travel path of the laser beam is changed into a vertical direction by a reflective mirror next to a laser beam-emitting surface of the laser diode chip. As a result, the beam arrangement of the external cavity is available on a plane parallel to the bottom plane of the package through a lens installed on the vertical travel path of the laser beam. Consequently, the beam is easily arranged. Further pore, an additional reflective mirror is installed above the lens which changes the vertical travel path into a horizontal travel path, which allows the beam traveling parallel to the bottom plane to be easily arranged through the lens. The production of the package can also be enabled in the configuration where various optical tools are arranged on the bottom of the package. Therefore, the semiconductor laser using an external cavity and having various characteristics can be easily manufactured. | 09-01-2011 |
20110305252 | METHOD AND APPARATUS FOR THE ADJUSTMENT OF A LASER HEAD - The invention relates to a method for the adjustment of the beam axis of a laser head and an apparatus for this purpose. The method includes the steps of introducing the laser head ( | 12-15-2011 |
20120033691 | Device for Determining the Position of at Least One Structure on an Object, Use of an Illumination Apparatus with the Device and Use of Protective Gas with the Device - A device for determining the position of a structure ( | 02-09-2012 |
20140169392 | LASER EMITTER MODULE AND LASER DETECTING SYSTEM TO WHICH THE LASER EMITTER MODULE IS APPLIED - A laser emitter module may include a first laser emitter configured to output first laser beam having a first radiation angle by receiving first input laser beam and a second laser emitter configured to output second laser beam having a radiation angle different from the first radiation angle by receiving second input laser beam having a width different from that of the first input laser beam. The first and second laser emitters output the first and second laser beam together. | 06-19-2014 |
20140286365 | Solid State Lighting Device - According to one embodiment, a solid state lighting device includes an irradiating section, a scattering section, a wavelength conversion layer, a supporting plate, a returned light guiding section, a light receiving section, and a control circuit. The irradiating section emits laser light. The scattering section includes a light scattering material that reflects the laser light and emits the laser light as scattered light. The wavelength conversion layer absorbs the scattered light made incident thereon and emits wavelength-converted light. The scattered light and the wavelength-converted light change to returned light and propagate through the inside of the supporting plate. The returned light is introduced into the returned light guiding section. The light receiving section detects the returned light. When a detected light amount of the returned light is outside a predetermined range, the control circuit outputs an emission stop signal for the laser light to the irradiating section. | 09-25-2014 |
20180024371 | OPTICAL ELEMENT AND LIGHTING APPARATUS | 01-25-2018 |
372290011 | Feedback circuitry | 32 |
20080225910 | LASER DRIVER BIAS CURRENT CALIBRATION - A method for a calibration module to calibrate laser bias current in an optical transceiver. The method comprises causing the calibration module to configure a control module of the optical transceiver for a calibration operation, causing the calibration module to determine a laser bias current monitored by the control module, and determining one or more calibration factor values that cause the laser bias current monitored by the control module to substantially match a laser bias current as measured by an external test meter. | 09-18-2008 |
20080279234 | 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 feedback control signal. The wavelength control signal is adjusted based on the results of a comparison of a detected intensity signal with a feedback signal to align the lasing wavelength with the conversion efficiency peak of the wavelength conversion device. Laser controllers and projections systems operating according to the control concepts of the present invention are also provided. | 11-13-2008 |
20080304524 | 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 of more compact, low-voltage batteries. | 12-11-2008 |
20090103578 | Method of Protecting a Laser Against Damage Caused by Undesired Incident Light in a Resonator - A method of protecting a laser against damage caused by undesired incident light in a resonator includes measuring a parameter, which is a measure for the optical power of the incident light. In more concrete terms, the optical power occurring at a resonator mirror is measured. In response to a result of the measurement, a pumping power for the laser is reduced to reduce the optical power in the resonator to a value that is uncritical for the laser. | 04-23-2009 |
20090147809 | 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. | 06-11-2009 |
20090154511 | OPTICAL OUTPUT CONTROL CIRCUIT AND OPTICAL OUTPUT MONITORING METHOD FOR MONITORING OPTICAL OUTPUT FROM LASER LIGHT SOURCE - A Light receiver generates a monitoring voltage according to an optical output of an LD element. The control circuit obtains a set value according to the ambient temperature around the LD element, and controls the optical output of the LD element on the basis of the comparing the result between the set value and the monitoring voltage. An adjustment section corrects the monitoring voltage on the basis of the set value and outputs the corrected monitoring voltage. | 06-18-2009 |
20090161707 | 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 also includes photodiodes to provide a measured luminance. The commanded luminance and measured luminance are compared, and drive currents for the laser diodes are adjusted to compensate for changes in laser diode characteristics. | 06-25-2009 |
20090201955 | ILLUMINATION APPARATUS AND METHOD FOR CONTROLLING ENERGY OF A LASER SOURCE - The disclosure relates to an illuminating apparatus for illuminating a sample on a work stage, optionally with a relatively narrow illuminating line of relatively controlled energy, as well as methods for controlling energy of a laser source when illuminating a sample on a work stage with a relatively narrow illuminating line. | 08-13-2009 |
20090245305 | Laser System With Segmented Diode Laser - Disclosed is a laser system comprising: A laser assembly ( | 10-01-2009 |
20090245306 | 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 the ability for broadband electronic tunability of optical signals and the cascading of multiple lasers for enhanced tunability and coherent combining for increased output power. | 10-01-2009 |
20090252187 | Minimizing Power Variations In Laser Sources - The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a projected laser image is generated utilizing an output beam of the semiconductor laser. A gain current control signal is generated by a laser feedback loop to control the gain section of the semiconductor laser. Wavelength fluctuations of the semiconductor laser are narrowed by incorporating a wavelength recovery operation in a drive current of the semiconductor laser and by initiating the wavelength recovery operations as a function of the gain current control signal or an optical intensity error signal. Additional embodiments are disclosed and claimed. | 10-08-2009 |
20100054288 | Method and Device for Reducing Laser Phase Noise - The present invention relates to a method and device for reducing the phase noise of a laser signal from a laser source. This device comprises a first current generator for supplying a driving current to the laser source in view of producing the laser signal. A phase noise detector is responsive to the laser wavelength for generating a phase error signal and a second current generator is responsive to the phase error signal for generating a compensation current added to the driving current supplied to the laser source for generating a phase-adjusted laser signal. The device therefore defines a phase stabilization loop formed by the phase noise detector and the second current generator, for reducing the phase noise of the laser signal. | 03-04-2010 |
20100091806 | Semiconductor Lasers with Improved Temporal, Spectral, and Spatial Stability and Beam Profile Uniformity - A method for improving spectral, spatial, and temporal stability of semiconductor lasers and their beam profile uniformity based on statistical average of plural transient or unsteady state longitudinal and lateral modes that are continuously perturbed. A laser module implementing the method comprises a semiconductor laser, a drive circuit generating RF-modulated drive current, and an automatic power control loop for producing stable, low noise and uniform or nearly uniform illumination field along one or two dimensions. | 04-15-2010 |
20100135346 | INTEGRATED OPTICAL COMB SOURCE SYSTEM AND METHOD - The present invention provides a system and method for creating a coherent optical comb comprising a plurality of lasers, each laser providing an optical output channel; means for combining each optical channel output; a modulator for modulating the combined optical channel outputs, to provide a modulated signal; means for feeding back said modulated signal to said plurality of lasers, such that each laser output channel is phase and/or frequency locked with respect to at least one other of said plurality of lasers. A discrete optical comb is obtained without the need for excessively high power laser outputs and only employs a single (optional) wavelength locker for all channels. | 06-03-2010 |
20100150189 | 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 preceding the constant current circuit, and using detection means for calibration for detecting an applied laser output; calculating, on the basis of a detection signal output from the detection means, a reference bias value and a reference gain value for obtaining a specified laser output with respect to a specified input to the multiplier; inputting the reference bias value and the reference gain value to the adder and the multiplier, respectively; and controlling the applied laser output from the semiconductor laser element by performing calibration. | 06-17-2010 |
20100158055 | METHOD AND APPARATUS FOR CONTROLLING AND MONITORING LASER POWER IN BARCODE READERS - A method of monitoring the output power of a laser diode in a barcode reader. The method includes sampling a threshold monitoring-current that is related the driving-current passing through the laser diode during a first time period when this current is at the lasing threshold of the laser diode. The method includes generating a threshold-compensated monitoring-current by subtracting the threshold monitoring-current from the above-threshold monitoring-current. The method includes monitoring the output power of the laser diode in the barcode reader at least partially based on the threshold-compensated monitoring-current. | 06-24-2010 |
20100265974 | 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 reflective element in a lossless manner under total internal reflection and into one of a plurality of photodiodes that sense an optical characteristic such as output beam intensity, where this sensed signal is then used as part of a feedback control to control operation of the laser sources in the array. | 10-21-2010 |
20110103415 | OPTICAL DEVICE FOR WAVELENGTH LOCKING - An optical device comprising a 1×2 optical coupler on a planar substrate and a waveguide on the planar substrate, the waveguide having a first arm and a second arm coupled to the 1×2 optical coupler. The device also comprises an optical resonator on the planar substrate, wherein the optical resonator is optically coupled to the first arm and the optical resonator is substantially athermalized. | 05-05-2011 |
20110228801 | System and Method to Regulate High Current Radiation Sources - Disclosed is a high current radiation system. The system includes a high current radiation source to generate radiation and an analog circuit to generate, based, at least in part, on an input signal representative of the present current level delivered to the high current radiation source and a user-controlled input representative of a desired current level, an output signal to control a current level to be delivered to the high current radiation source. The system further includes a current driver to control the current delivered to the high current radiation source based, at least in part, on the output signal of the analog circuit. | 09-22-2011 |
20110249692 | BEAM DIAGNOSTICS AND FEEDBACK SYSTEM AND METHOD FOR SPECTRALLY BEAM-COMBINED LASERS - Apparatus and method for control of lasers (which use an array of optical gain fibers) in order to improve spectrally beam-combined (SBC) laser beam quality along the plane of the SBC fiber array via spectral-to-spatial mapping of a portion of the spectrally beam-combined laser beams, detection of optical power in each of the spatially dispersed beams and feedback control of the lasers for wavelength-drift correction. The apparatus includes a diffractive element; a source of a plurality of substantially monochromatic light beams directed from different angles to a single location on the diffractive element, wherein the diffractive element spectrally combines the plurality of light beams into a single beam. A controller adjusts characteristics of the light beams if one of the light beams has become misadjusted. In some embodiments, the controller adjusts the wavelength tuning of the respective fiber laser. | 10-13-2011 |
20110255564 | IMAGE DISPLAY DEVICE AND LASER LIGHT SOURCE DEVICE - An image display device including a laser light source device that includes: laser elements of different output wavelengths; a pulse signal generating unit that generates pulse signals based on a video signal; a laser driving unit that drives the laser elements in synchronization with the pulse signals; an optical combining system that combines laser beams, outputs a combined laser beam, and retrieves part of the combined laser beam; a light amount measuring unit that measures a light amount of a retrieved laser beam; and a light amount adjusting unit that causes the laser driving unit to individually adjust a light amount for the each laser element based on a measurement value, wherein the pulse signal generating unit operates in a light amount measuring mode so that emission timings would not coincide one another, and the light amount measuring unit individually measures a light amount of the each laser element. | 10-20-2011 |
20120183004 | Ultra-Low Frequency-Noise Semiconductor Laser With Electronic Frequency Feedback Control and Homodyne Optical Phase Demodulation - The present invention provides a semiconductor laser that operates with a frequency feedback control loop for frequency-noise reduction. The frequency-reduction architecture utilizes a homodyne optical phase demodulation approach. Such phase demodulation can be implemented with help of an unbalanced Michelson interferometer with fiber optics delay and symmetrical ‘n×n’ optical coupler. The entire demodulator is packaged in a small form-factor package which doesn't have any mechanical resonance in the sensing bandwidth, and has very low sensitivity to the external acoustic or vibration induced noise sources. | 07-19-2012 |
20120243567 | LASER IRRADIATION DEVICE AND MICROPARTICLE MEASURING DEVICE - A laser irradiation device includes: a laser light source; a mirror that reflects a part of light output from the laser light source and allows the remainder to pass; an optical detector that detects reflection light reflected by the mirror; and a feedback control circuit that receives a signal output from the optical detector and controls the output of the laser light source to keep a signal intensity constant, wherein a thickness of the mirror is set such that a distance between a beam spot of the reflection light reflected by a front surface of the mirror on the detector and a beam spot of reflection light reflected by a back surface of the mirror on the detector is equal to or more than a predetermined value. | 09-27-2012 |
20130016745 | DRIVER FOR LASER DIODE INTEGRATED WITH EXTERNAL MODULATORAANM MOTO; AkihiroAACI Yokohama-shiAACO JPAAGP MOTO; Akihiro Yokohama-shi JP - A driver for EA-DFB device is disclosed. The EA-DFB device is put between the positive power supply and the negative power supply as connected in series to the bias current source and the switching device. The EA device is modulated by the switching device in the differential mode. The switching device includes paired transistors each having a load, one of which is a resistor connected in parallel to the EA device, while, the other is constituted by a resistive element. | 01-17-2013 |
20130182732 | LASER SYSTEM - To improve a laser system comprising at least one externally stabilizable semiconductor laser, from the laser active zone of which a laser radiation field can be coupled oute, and a feedback element, disposed externally in the laser radiation field, which couples out, from the laser radiation field, a feedback radiation field having a defined wavelength and bandwidth, and couples back same into the active laser zone for determining the wavelength and bandwidth of the laser radiation field, in such a way that the wavelength stabilization may be achieved more cost-effectively, it is proposed that the feedback element is a resonant waveguide grating which reflects back a portion of the laser radiation field lying within an angular acceptance range. | 07-18-2013 |
20140029634 | SEMICONDUCTOR MICROTUBE LASERS - Disclosed are semiconductor microtube lasers including a semiconductor multilayer heterostructure. The multilayer heterostructure includes a substantially cylindrical optically active structure capable of light emission when under the influence of an applied electromagnetic field and a substantially cylindrical distributed feedback grating structure configured to provide optical feedback for a selected wavelength of light from the optically active region and to produce lasing action from the microtube when under the influence of an applied electromagnetic field. | 01-30-2014 |
20140328359 | LASER APPARATUS - A laser light generator emits laser light, a frequency of which can be adjusted. A laser light detector bombards an iodine cell with the laser light and photoelectrically converts the laser light that has passed through the iodine cell, then outputs a light output signal. A third order differential lock-in amplifier generates a third order differential signal of the light output signal. A frequency locker causes the laser light generator to change the frequency of the laser light within a predetermined range, detects an amplitude corresponding to a saturated absorption line occurring in the third order differential signal, and causes the frequency of the laser light to stabilize to a predetermined value. An error detector outputs an error signal in a case where the amplitude corresponding to the saturated absorption line occurring in the third order differential signal is greater than a predetermined value. | 11-06-2014 |
20140355632 | SOLID-STATE LASER DEVICE - A control circuit measures fluctuations in the energy of a pulse laser with respect to the power of an RF signal by varying the power of the RF signal, determines the minimum power of the RF signal which yields a permissible level of fluctuation, and sets the power of the RF signal based on the minimum power of the RF signal. Heat generation in the RF signal generation circuit can be suppressed, and the overall power consumption can also be reduced. It is also possible to reduce the time from when the RF signal is turned on until the RF signal is turned off. As a result, it is possible to generate a stable pulse laser. | 12-04-2014 |
20150036705 | METHOD FOR CONTROLLING WAVELENGTH-TUNABLE LASER - The method for controlling a wavelength-tunable laser comprises a first step of acquiring a driving condition of the wavelength-tunable laser for laser oscillation at a first wavelength, and a second step of calculating according to the driving condition of the first wavelength and a wavelength difference between the first wavelength and a second wavelength different from the first wavelength a control value or target value of a wavelength characteristic of the second wavelength in the wavelength detection unit, so as to calculate a driving condition for driving the wavelength-tunable laser, the second step including a step of selecting according to the wavelength difference one of etalon slopes having respective gradients identical and opposite to a gradient of an etalon slope used for controlling the first wavelength. | 02-05-2015 |
20150318663 | SENSING MODULE AND LASER DEVICE - Disclosure is related to a sensing module and a Laser device using the sensing module. The sensing module is adapted to a Laser module. The sensing module essentially includes a beam splitter and a photo sensor. This beam splitter is disposed at an optical-axis path of laser beam. The splitter is used to split the laser beam into a transmissive beam and a reflective beam. The photo sensor however is disposed apart from the optical-axis path of the original laser beam. The photo sensor converts the sensed photo signals into electrical signals which are as feedback signals to the laser module. | 11-05-2015 |
20160380406 | COMPACT WDM OPTICAL MODULES - Methods, systems, and apparatus, for optical communication. One apparatus includes a Fabry-Perot (FP) laser diode assembly coupled to a first port of a circulator; an optical amplifier coupled to a second port of the circulator; a wavelength division multiplexer (WDM) filter coupled to a third port of the circulator; and a Faraday rotator mirror coupled to the WDM filter. | 12-29-2016 |
20170237224 | GAS OPTIMIZATION IN A GAS DISCHARGE LIGHT SOURCE | 08-17-2017 |
372290012 | Power supply | 4 |
20080253414 | VCSEL DRIVER - The invention provides a driver for a semiconductor light emitting device, in particular a vertical cavity surface emitting laser (VCSEL) which includes a delay buffer for generating an output signal as a delayed version of an input signal; a pulse generation stage coupled in parallel with the delay buffer and adapted to produce selectively positive and negative output pulses starting concurrently with respective positive and negative edges of the output signal of the buffer; and a summer for summing the output signal and the pulses. | 10-16-2008 |
20130170512 | MULTIPLE PHASE-LOCKED LOOPS FOR HIGH-POWER RF-POWER COMBINERS - An RF power-supply for driving a carbon dioxide CO | 07-04-2013 |
20140233594 | DC-COUPLED LASER DRIVE CIRCUIT AND METHOD FOR DRIVING LASER DIODE DEVICE - A DC-coupled laser drive circuit ( | 08-21-2014 |
20140362882 | ELECTRONIC FAIL-SAFE LASER SHUTTER - An improved laser safety shutter is provided for the main supply power to the laser diode to be routed through an electronic shutter that prevents the passing of the supply power to the laser diodes to achieve laser shutdown or in the event of a control power failure. The main power is routed through a rectifier to convert the incoming alternating current (AC) feed to direct current (DC) power. A switching array operates in an alternating cycle so as to provide AC power to be transformed and passed along to the laser diode pump on the load side of the transformer. When shut down of the laser is desired or when power to the controller fails, the switches stop operating and the resultant DC power cannot be passed by the transformer effectively cutting the supply power to the laser diodes. | 12-11-2014 |
372290013 | Having particular electrode structure | 1 |
20130022064 | Laser Package Having Multiple Emitters Configured on a Substrate Member - A method and device for emitting electromagnetic radiation at high power using nonpolar or semipolar gallium containing substrates such as GaN, AN, InN, InGaN, AlGaN, and AlInGaN, is provided. In various embodiments, the laser device includes plural laser emitters emitting green or blue laser light, integrated a substrate. | 01-24-2013 |
372290014 | Controlling light intensity | 14 |
20080240181 | Laser apparatus and output control method of laser apparatus - A laser apparatus includes: a laser light source; an output member for receiving and transmitting a laser light flux generated by the laser light flux, and outputting a laser light flux; an optical aligning member for positioning the laser light flux generated by the laser light source to the output member; a drive for driving the optical aligning member; a drive controller; an output detector for outputting a detected output representing an intensity of a laser light flux outputted from the output member; and an output controller. The drive controller controls the drive to drive the optical aligning member and the output controller changes a power of the laser light flux generated by the light source, based on the detected output. | 10-02-2008 |
20090116519 | SCALABLE, RECONFIGURABLE, LASER COMBINER - Modular electrical, mechanical and optical components allow for the building of a laser combiner system that can be used, for example, for biological research that allows different lasers to be easily added to or removed from a laser system. Each individual laser can be packaged into a module which can be added to or taken away from the laser system with relative ease. Each of the modules can be controlled via a control module that allows one or more of varying of power levels, switching on/off, shutter control and diagnostic/status information monitoring. | 05-07-2009 |
20090135865 | Method for controlling power of an optical disk drive - A method for controlling laser power of an optical disk drive is provided. Firstly, a power-controlling curve of a first loop circuit is formed according to a real test. Next, two test points are selected from the power-controlling curve. Then, the voltage outputted from a second loop circuit is adjusted. After that, whether the generated internal power signal is equal to the internal power signal of the two test points is checked. Afterwards, the voltage outputted from the second loop circuit is recorded. Then, the gain of the two loop circuits under the same change of the internal power signal is calculated. Lastly, a gained power-controlling curve of the first loop circuit is used as a power-controlling curve of the second loop circuit, such that the power-controlling curve is quickly obtained. | 05-28-2009 |
20090219962 | Control Modules for Laser Systems Having Auto-Ranging and Control Capability - Control modules for automatically adjusting a laser output based on a range to an object detected within a field of view are disclosed. | 09-03-2009 |
20090245307 | LASER FORMING APPARATUS AND METHOD FOR MANUFACTURING HEAD SUSPENSION WITH THE APPARATUS - In a laser forming apparatus, a first optical system and a second optical system are provided symmetrically with respect to a vertical plane to a center line of a head suspension targeted for spring pressure adjustment. A half mirror branches laser light emitted from one laser oscillator into two to guide the branched light beams to the two optical systems. The head suspension is structured such that optical spots formed by the first and second optical systems condensing laser light are positioned at the same distance from the center line of the head suspension. Condenser lenses of the first and second optical systems are arranged on right and left sides in a plane-symmetrical form to scan the optical sports to thereby adjust a spring pressure of a head suspension. | 10-01-2009 |
20100260217 | SCALABLE, RECONFIGURABLE, LASER COMBINER - Modular electrical, mechanical and optical components allow for the building of a laser combiner system that can be used, for example, for biological research that allows different lasers to be easily added to or removed from a laser system. Each individual laser can be packaged into a module which can be added to or taken away from the laser system with relative ease. Each of the modules can be controlled via a control module that allows one or more of varying of power levels, switching on/off, shutter control and diagnostic/status information monitoring. | 10-14-2010 |
20100265975 | EXTENDED CAVITY SEMICONDUCTOR LASER DEVICE WITH INCREASED INTENSITY - The present invention relates to an extended cavity semiconductor laser device comprising an array of at least two semiconductor gain elements ( | 10-21-2010 |
20120327963 | QUASI-REMOTE LASER PULSE COMPRESSION AND GENERATION OF RADIATION AND PARTICLE BEAMS - A system and methods for the quasi-remote compression and focusing of a moderate-intensity laser pulse to form a much higher intensity beam that can be directed at a target and used as a probe beam or used in a probe beam converter to generate other forms of electromagnetic radiation or energetic particles. A system for the quasi-remote propagation of high-intensity laser beams in accordance with the present invention comprises a main platform on which a first, “seed” laser pulse is generated, stretched, and amplified, and a remote platform, located at a distance from the main platform, which is configured to receive the amplified and stretched pulse and convert it into the high-intensity laser beam. The high-intensity laser beam in turn can then be converted into one or more probe beams directed at a target object. | 12-27-2012 |
20130044774 | CONTROLLING LASER POWER - An intensity of radiation emitted from at least two laser diodes of a projecting apparatus is optimized by providing an offset distance between at least two focal points of the at least two laser diodes and providing a maximum value for radiation intensity emitted by each of the laser diodes, irrespective of simultaneous transmission by one of the laser diodes with another of the laser diodes. The intensity of the radiation emitted from each of the at least two laser diodes is adjusted such that an aggregated value of the radiation intensity emitted by all of the laser diodes within a predefined period of time may exceed a threshold value allowed for the maximum permissible exposure to radiation. | 02-21-2013 |
20130148677 | EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE, LASER LIGHT SOURCE DEVICE FOR EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE, AND METHOD OF ADJUSTING LASER LIGHT SOURCE DEVICE FOR EXTREME ULTRAVIOLET LIGHT SOURCE DEVICE - An EUV light source device properly compensates the wave front of laser beam which is changed by heat. A wave front compensator and a sensor are provided in an amplification system which amplifies laser beam. The sensor detects and outputs changes in the angle (direction) of laser beam and the curvature of the wave front thereof. A wave front compensation controller outputs a signal to the wave front compensator based on the measurement results from the sensor. The wave front compensator corrects the wave front of the laser beam to a predetermined wave front according to an instruction from the wave front compensation controller. | 06-13-2013 |
20130230066 | LIGHT SOURCE DEVICE, ANALYSIS DEVICE, AND LIGHT GENERATION METHOD - In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG. | 09-05-2013 |
20140003456 | Device For Converting The Profile of a Laser Beam Into a Laser Beam With a Rotationally Symmetrical Intensity Distribution | 01-02-2014 |
20140348190 | METHOD FOR DESIGNING LASER-LIGHT-SHAPING OPTICAL COMPONENT, METHOD FOR PRODUCING LASER-LIGHT-SHAPING OPTICAL COMPONENT, AND LASER-LIGHT-SHAPING OPTICAL SYSTEM - A method for designing an optical component for shaping laser light according to one embodiment of this invention measures the intensity distribution of an incident laser light, obtains the shapes in the short and long axial directions of a pair of aspheric lenses for each of the short and long axial directions of the incident laser light from the measured intensity distribution of the incident laser light and a desired intensity distribution, performs approximation of a high-order polynomial of the shapes in the short and long axial directions of the pair of aspheric lenses, corrects the high-order polynomials for the short or long axial directions using a correction factor, and obtains the shapes of the pair of aspheric lenses on the basis of the corrected high-order polynomials. | 11-27-2014 |
20150110139 | ACTUATION DEVICE FOR A LASER DIODE, LASER PROJECTION SYSTEM AND METHOD FOR SPECKLE REDUCTION IN A LASER DIODE - An actuation device for a laser diode includes: a first driver device which is set up to generate a high-frequency modulated actuation signal and to feed the signal into the laser diode for speckle suppression, and an evaluation circuit, which is coupled with the first driver device, and which is set up to output to the first driver device an intensity signal indicating the intensity of the light emitted by the laser diode and a control signal as a function of the intensity signal in order to regulate the high-frequency modulated actuation signal. | 04-23-2015 |
372290015 | Controlling current or voltage | 16 |
20080205460 | OPTICAL AMPLIFYING APPARATUS - The present invention provides an optical amplifying apparatus having: a CPU | 08-28-2008 |
20080279235 | Method and Apparatus For Driving Semiconductor Lasers, and Method and Apparatus For Deriving Drive Current Patterns For Semiconductor Lasers - Semiconductor lasers are driven such that high output laser beams are stably obtained without a long start up time. A method for driving semiconductor lasers by automatic current control or automatic power control with a constant current source involves the steps of: generating a pattern of drive current values for the semiconductor lasers, which is defined according to the amount of time which has elapsed since initiating driving thereof, that enables obtainment of substantially the same light output as a target light output by the automatic current control or the automatic power control; and varying the drive current of the semiconductor lasers in stepwise increments according to the pattern for a predetermined period of time from initiation of drive thereof A single pattern is used in common to drive the plurality of semiconductor lasers. | 11-13-2008 |
20090041071 | CONTROL CIRCUIT FOR A LASER DIODE AND A METHOD TO CONTROL A LASER DIODE - A control circuit for a laser diode is disclosed, in which the driving current may be suppressed even when the monitor PD breaks down to make the APC feedback control inoperable. The control circuit comprises an LD driver to supply the driving current to the LD, a monitor PD to detect a portion of output light from the LD, and the APC controller to adjust the driving current. The current limiter, when the driving current reaches or exceeds the threshold, controls the driving current Id so as to keep the current in a preset value or a value just before the extraordinary increase of the driving current occurs. | 02-12-2009 |
20090141754 | METHOD AND APPARATUS FOR DRIVING SEMICONDUCTOR LASERS, AND METHOD AND APPARATUS FOR DERIVING DRIVE CURRENT PATTERNS FOR SEMICONDUCTOR LASERS - Semiconductor lasers are driven such that high output laser beams are stably obtained without a long start up time. The light outputs of a plurality of semiconductor lasers are detected by photodetectors. The semiconductor lasers are driven by automatic power control based on comparison results between the output of the photodetectors and a set value corresponding to a target light output for the semiconductor lasers. A correction pattern that corrects the set value and/or the output of the photodetectors such that the actual light output becomes uniform is generated in advance. The set value and/or the output are varied according to the correction pattern for a predetermined period of time from initiation of drive. A single correction pattern is employed in common with respect to the plurality of semiconductor lasers. | 06-04-2009 |
20090274182 | LIGHT SOURCE, LIGHT SOURCE DEVICE, LASER IMAGE FORMING DEVICE AND INTEGRATED CIRCUIT - The light sources ( | 11-05-2009 |
20100309939 | Multi-chamber gas discharge laser bandwidth control through discharge timing - A method and apparatus are disclosed for controlling bandwidth in a multi-portion laser system comprising a first line narrowed oscillator laser system portion providing a line narrowed seed pulse to an amplifier laser system portion, may comprise utilizing a timing difference curve defining a relationship between a first laser system operating parameter other than bandwidth and the timing difference and also a desired point on the curve defining a desired timing difference, wherein each unique operating point on the curve corresponds to a respective bandwidth value; determining an actual offset from the timing difference at the desired point on the curve to an actual operating point on the curve; determining an error between the actual offset and a desired offset corresponding to a desired bandwidth; modifying the firing differential timing to remove the error between the actual offset and the desired offset. | 12-09-2010 |
20110064098 | SEMICONDUCTOR LASER CONTROL DEVICE AND IMAGE FORMING DEVICE - There provided is a semiconductor laser control device which including plural light sources that are configured with eight or more semiconductor laser elements, a one detecting section that detects a light power of the light sources, a light power control unit that compares a signal according to a light power detected by the detecting section with a control signal corresponding to a predetermined light power to control a current supplied to the light sources, and a voltage clamp circuit that functions as an overvoltage preventing means for the detecting section when turning on each of the light sources to perform light power control. | 03-17-2011 |
20110134947 | LASER ASSEMBLY AND METHOD AND SYSTEM FOR ITS OPERATION - A laser assembly and a method for controlling light output thereof are presented. The laser assembly comprises a semiconductor laser diode having an active region and its associated electric current driver. The electric current driver is controllably operated to excite said active region to induce a certain electric current profile therethrough. The electric current profile corresponds to a desired emission profile from the laser assembly and a desired over heating profile of the active region of the laser diode, while maintaining predetermined temperature range of said active region of the semiconductor laser diode. | 06-09-2011 |
20110164632 | METHOD OF DRIVING A LASER DIODE - An ultrashort pulse/ultra-high power laser diode with a simple structure and configuration. The laser diode can be driven by a pulse current which is 10 or more times higher than a threshold current value. The width of the pulse current is preferably 10 nanoseconds or less, and the value of the pulse current is specifically 0.4 amperes or over. | 07-07-2011 |
20110317728 | LASER SAFETY VIEWING WINDOW - An apparatus includes a window to absorb and/or reflect a radiation of a laser light. The apparatus may include a continuous material affixed to the window to transfer energy through the continuous material in a continuous pattern such that an alteration of the continuous material from the laser light of a laser adjusts a power of the laser light of the laser. The window may be a transparent shield to allow a user to view the laser process and to protect the user from the radiation of the laser light. The continuous material may be a wire. The wire may be a string of a conductive material. Examples of the conductive material may include platinum, silver, iron, copper, aluminum, gold, brass, bronze, conductive plastic, and/or semiconductor. The alteration may be damage to the wire to interrupt the current of the electricity through the wire. | 12-29-2011 |
20120140784 | SPECKLE REDUCTION FOR LASER PROJECTION DISPLAYS - Various embodiments of the present invention relate to a laser driver, and more particularly, to systems, devices and methods of applying low current pulses to a laser modulation current to reduce the speckling noise on the projected images. | 06-07-2012 |
20120327964 | ALGORITHM TO DRIVE SEMICONDUCTOR LASER DIODE - An algorithm to drive a semiconductor laser diode (LD) is disclosed. The algorithm assumes that the modulation current to keep the extinction ratio in constant has temperature dependence represented by an exponential function under the average output power of the LD is kept constant by an auto-power-control (APC). When a tracking error exists and the approximation by an exponential function is turned out in failure, the algorithm adds a correction to the exponential function determined by a difference between a practically measured modulation current and another modulation current calculated from a value determined for a bared LD. | 12-27-2012 |
20130016746 | Vertical Surface Emitting Semiconductor Device - A semiconductor light emitting device includes a pump light source, a gain structure, and an out-coupling mirror. The gain structure is comprised of InGaN layers that have resonant excitation absorption at the pump wavelength. Light from the pump light source causes the gain structure to emit light, which is reflected by the out-coupling mirror back to the gain structure. A distributed Bragg reflector causes internal reflection within the gain structure. The out-coupling mirror permits light having sufficient energy to pass therethrough for use external to the device. A frequency doubling structure may be disposed between the gain structure and the out-coupling mirror. Output wavelengths in the deep-UV spectrum may be achieved. | 01-17-2013 |
20130208743 | BROADBAND QUANTUM CASCADE LASER SOURCE - A broadband quantum cascade laser (QCL) source includes one or more QCLs having an active region designed based on a diagonal laser transition. The QCL source may include multiple QCLs formed in an array or the QCL source may comprise a single QCL device. Although each QCL provides an emission spectrum comprising a small range of wavelengths at a given applied voltage, changes in the applied operating voltage result in changes in the emission spectrum of the QCL due to the Stark shift. When the QCL source comprises a plurality of QCLs formed in an array, at least some of the elements in the array may receive different applied operating voltages such that the combined output spectrum of the array is broader than that achievable by a single QCL. When the QCL source comprises a single QCL device, an applied operating voltage may be swept through a range of applied voltages such that that combined output spectrum over one sweep cycle is broader than the output spectrum of the QCL device when a static operating voltage is applied. Alternatively, the single QCL device may comprise multiple independent gain sections, wherein each of the independent gain sections is configured to operate at a different voltages to provide a broadband output spectrum. | 08-15-2013 |
20140036944 | METHOD FOR ADJUSTING ELECTRO-OPTIC MODULATOR IN LASER DEVICE, AND LASER DEVICE - A laser device includes: a signal light source that outputs seed light; an electro-optic modulator that chops a portion of the seed light outputted from the signal light source and outputs signal light; an optical amplifier that amplifies the signal light outputted from the electro-optic modulator; a wavelength conversion optical element that wavelength converts the signal light amplified by the optical amplifier; a converted light detector that detects the signal light that has been wavelength converted by the wavelength conversion optical element; and an EU control unit that controls the operation of the electro-optic modulator, wherein the EU control unit is adapted, in the state in which the seed light is being outputted, to adjust bias voltage of the electro-optic modulator on the basis of the applied voltage when the intensity of the signal light after wavelength conversion detected by the converted light detector becomes substantially maximum. | 02-06-2014 |
20150092800 | MOPA LASER SOURCE WITH WAVELENGTH CONTROL - The invention provides a wavelength-controlled pump MOPA laser and a method of operation thereof. A monolithic semiconductor MOPA laser chip has a DFB-laser based MO (master oscillator) and PA (power amplifier) sections formed in a same monolithic waveguide, and separate MO and PA electrodes for individual control of current injection into the MO and PA sections. The laser wavelength is defined by the DFB grating and is kept fixed by suitably controlling the MO current to compensate for a thermal crosstalk from the PA section, or tuned by suitably changing the MO current or direct heating of the DFB region. | 04-02-2015 |
372290016 | Controlling beam phase | 4 |
20100142573 | 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 generated from the continuous wave laser signal upon being driven by the pulse signal. A pulse intensity level to be applied to the phase of the shaped optical pulse is received. A phase correcting signal is generated based on the pulse intensity level. Application of the phase correcting signal to the shaped optical pulse is time-synchronized and the phase correcting signal is applied to the shaped optical pulse to generate a pre-corrected shaped optical pulse. | 06-10-2010 |
20100158056 | SEMICONDUCTOR LASER DEVICE - Provided is a semiconductor laser device including: a gain area where multi-wavelength lights are generated and gain are provided; a first reflection area where among the multi-wavelength lights, a first-wavelength light is reflected to the gain area in response to a first selection signal; a second reflection area where among the multi-wavelength lights, a second-wavelength light is reflected to the gain area; and a phase control area where a phase of the second-wavelength light is shifted in response to a phase control signal, the phase control area being disposed between the first reflection layer and the second reflection layer. | 06-24-2010 |
20110216791 | PHASE CONTROL DEVICE FOR LASER LIGHT PULSE - According to the present inventions, a phase control device for laser light pulse includes a laser, a reference comparator, a measurement comparator, a phase difference detector and a loop filter. The laser outputs a laser light pulse. The reference comparator compares a voltage of a reference electric signal having a predetermined frequency and a predetermined voltage with each other, thereby outputting a result thereof. The measurement comparator compares a voltage based on a light intensity of the laser light pulse and a voltage of a measurement electric signal having the predetermined frequency, with a voltage of a phase control signal, thereby outputting a result thereof. The phase difference detector detects a phase difference between the output from the reference comparator and the output from the measurement comparator. The loop filter removes a high frequency component of an output from the phase difference detector. Further, the voltage of the phase control signal is different from the predetermined voltage. Furthermore, the laser changes the phase of the laser light pulse according to the output from the loop filter. | 09-08-2011 |
20140023099 | METHOD AND DEVICE FOR THE FAST PHASE EVALUATION, IN PARTICULAR OF MULTI-CYCLE PULSES OF LASER RADIATION - The aim of the present disclosure is to enable a fast CE phase evaluation of the laser pulses, in particular in real time, including for multi-cycle pulses. Said aim is achieved by providing a polarization gating stage ( | 01-23-2014 |