Entries |
Document | Title | Date |
20080205459 | LIGHT SOURCE DEVICE AND PROJECTOR - A light source device includes a plurality of light emission sections disposed in parallel with an interval, wherein the interval for the light emission sections near each end portion in an array of the light emission sections is narrower than the interval near a center portion in the array. | 08-28-2008 |
20080240179 | Two-dimensional photonic crystal surface-emitting laser - The two-dimensional photonic crystal surface emitting laser according to the present invention includes a number of main modified refractive index areas periodically provided in a two-dimensional photonic crystal and secondary structures each relatively located in a similar manner to each of the main modified refractive index areas. The location of the secondary structure is determined so that a main reflected light which is reflected by a main modified refractive index area and a secondary reflected light which is reflected by a secondary structure are weakened or intensified by interference. | 10-02-2008 |
20080240180 | OPTICAL FM SOURCE BASED ON INTRA-CAVITY PHASE AND AMPLITUDE MODULATION IN LASERS - A laser is disclosed including a gain section having a distributed feedback grating imposed thereon. An absorption section is embedded in the gain section such that the first and second portions of the distributed feedback grating extend on either side of the electro-absorption section. A controller imposes a substantially DC bias signal on the first and second gain electrodes and imposes a modulation signal encoding digital data on the modulation electrode to generate a frequency modulated signal. In some embodiments, the first and second portions are biased above the lasing threshold and the absorption section is modulated below the lasing threshold to modulate loss in the absorption section. | 10-02-2008 |
20080247429 | Coherence reduction of diode lasers - The invention provides a method of reducing a time-averaged coherence of laser radiation for current-tunable lasers, and a laser apparatus realizing the method, by modulating the laser drive current using a modulation function optimized for obtaining a pre-determined time-averaged spectral profile of the laser radiation. In a preferred embodiment, the pre-determined time-averaged spectral profile has a substantially Gaussian shape. The method is described in reference to laser diodes. | 10-09-2008 |
20080253411 | Optically Active Matrix with Void Structures - An optically active element, such as a photonic crystal, is formed by creating a matrix ( | 10-16-2008 |
20080253412 | Light source, and image display apparatus, monitoring apparatus, and illumination apparatus using the same - A light source that emits light includes light source units, each emitting a plurality of light beams parallel to one another, the plurality of light beams including first and second light beams, and a beam distance adjustment element that is an optical element made of a light-transmissive material. The beam distance adjustment element is configured to adjust the distance between the first and second light beams. The beam distance adjustment element includes a first incidence plane on which the first light beam is incident, a first exit plane that is parallel to the first incidence plane and from which the first light beam exits, a second incidence plane on which the second light beam is incident, and a second exit plane that is parallel to the second incidence plane and from which the second light beam exits. The first and second light beams intersect in the beam distance adjustment element. | 10-16-2008 |
20080267231 | DETUNED DUO-CAVITY LASER-MODULATOR DEVICE AND METHOD WITH DETUNING SELECTED TO MINIMIZE CHANGE IN REFLECTIVITY - A detuned duo-cavity laser-modulator device and method are provided which include lower, middle and upper reflectors, a gain region and an absorber region integrated into a semiconductor die. The middle reflector is disposed between the lower and upper reflectors. Together, the lower and middle reflectors define a first resonant cavity, while the upper and middle reflectors define a second resonant cavity. A gain region is disposed within a laser cavity of the resonant cavities to generate an optical carrier wave, while an absorber region is disposed within a modulator cavity of the resonant cavities to modulate a signal on the optical carrier wave. The laser and modulator cavities are detuned resonant cavities, with the detuning of the laser and modulator cavities being selected to minimized change in reflection from the modulator cavity to the laser cavity when the absorber region modulates the signal on the optical carrier wave. | 10-30-2008 |
20080273560 | Method and Apparatus for Optical Mode Multiplexing of Multimode Lasers and Arrays - According to methods and apparatus described herein, multimode laser source capable of emitting a diffraction-limited beam of various shapes (including single-lobe shape) can be realized. An optical apparatus for generating a such diffraction-limited beam comprises a spatial phase modulator for spatially modulating a spectrally dispersed optical signal emitted from a semiconductor laser into a combined-mode optical signal, wherein the lateral modes of the optical signal from the laser are combined into a diffraction-limited beam. Also, a coupling optical system is provided for wavelength-demultiplexing the multimode optical signal before the multimode optical signal is spatially modulated by the spatial phase modulator, and also for wavelength-multiplexing the combined-mode optical signal. | 11-06-2008 |
20080279233 | STRONG DISTRIBUTED FEEDBACK SEMICONDUCTOR LASER - The present invention relates to a strong distributed feedback semiconductor laser. More specifically, the invention implements a top optical waveguide ( | 11-13-2008 |
20080291952 | OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device with a semiconductor laser formed over a semiconductor substrate, and a modulator formed over the semiconductor substrate and continuously arranged with the semiconductor laser, wherein the semiconductor laser includes a first region having a diffraction grating with a phase shift, a second region arranged between the first region and the modulator, and in which the diffraction grating is not formed, and a common active layer formed over the first region and the second region, a first electrode injecting a current into the common active layer. | 11-27-2008 |
20090003396 | INTEGRATED PHOTONIC SEMICONDUCTOR DEVICES HAVING RIDGE STRUCTURES THAT ARE GROWN RATHER THAN ETCHED, AND METHODS FOR MAKING SAME - A SAG technique is used to grow the ridge structure in a photonic semiconductor device, such as an electroabsorption modulator integrated with a distributed feedback laser (EML) assembly. The adoption of this SAG technique to grow the ridge structure results in the formation of a self-assembled and self-aligned ridge structure that has a very precise configuration. The use of this process enables straight, bent and tilted ridge structures to be formed with high precision. In addition, because the ridge structure is self-assembled and self-aligned, a lesser number of processing steps are required to create the photonic device in comparison to the known approach that uses wet chemical etching techniques to form the ridge structure. The high precision of the ridge structure and the lesser number of processing steps needed to create the device increase manufacturing yield and allow overall cost of the device to be reduced. | 01-01-2009 |
20090016389 | LASER DRIVE CIRCUIT AND METHOD PROVIDING HIGH LIMIT CLIPPING CORRESPONDING TO LOW LIMIT CLIPPING IN A LASER - A laser drive circuit may be used to induce high limit clipping corresponding to natural low limit clipping in a laser, such as a laser diode, to reduce even order distortion such as composite second order (CSO) distortion. A drive current input may be provided to the active region of the laser to produce a modulated optical output in response to the drive current input. The laser drive circuit may include a current clamp at the drive current input, which clamps the drive current to provide the high limit clipping. The current clamp may receive an input current including current from a RF signal provided by a RF source together with a bias current provided by a bias current source. | 01-15-2009 |
20090052481 | Laser light source device and image generating device using same - Disclosed herein is a laser light source device including a pumping light source; a pair of resonator mirrors; a laser medium and a wavelength converting element within a resonator formed by the resonator mirrors; the laser medium being pumped by light in a transverse multi-mode pattern, the wavelength converting element being irradiated with a linear fundamental wave obtained by oscillation of the laser medium, and a linear converted wave being output; a reflecting part for folding back a resonant light path, the reflecting part being disposed on the light path between the laser medium and the wavelength converting element; an end surface of one of the laser medium and the wavelength converting element being formed as an inclined surface at other than a Brewster angle; and a polarizing film disposed on the inclined surface. | 02-26-2009 |
20090074019 | OPTICAL INJECTION LOCKING OF VCSELS FOR WAVELENGTH DIVISION MULTIPLEXED PASSIVE OPTICAL NETWORKS (WDM-PONS) - Low cost implementation of broadband upstream transmission for local and access network applications is made possible through the use of modulated downstream signals in a wavelength division multiplexed (WDM) passive optical network (PON) to injection-lock vertical-cavity surface-emitting lasers (VCSELs) for operation as stable, uncooled, and directly-modulated upstream transmitters. By way of example and not limitation, an optical network unit comprises: downstream input, photoreceiver, tunable laser, upstream output, and means for directionally coupling the downstream input into the tunable laser for modulating the output wavelength which is coupled to the upstream output. | 03-19-2009 |
20090097516 | RF and microwave receivers based on electro-optic optical whispering gallery mode resonators - RF receivers based on whispering gallery mode resonators. | 04-16-2009 |
20090141753 | TWO-DIMENSIONAL IMAGE DISPLAY DEVICE - There has been a problem that interference noise called speckle noise occurs in a two-dimensional image display device using laser, and there is no applicable green light source although the speckle noise can be reduced by using a multi-wavelength light source. The present invention adopts a Yb-doped clad pump fiber ( | 06-04-2009 |
20090175302 | Method and apparatus for reducing optical signal speckle - An optical signal generator is configured with an associated control system and driver configured to reduce speckle. Speckle reduction occurs by pulsing the drive signal between a first current level and a second current level. These pulses force the optical signal generator to introduce oscillations into the optical signal. The coherence of the emitted light is reduced during the period of oscillations in the optical signal, which reduces speckle. In one embodiment, the pulsing of the drive signal brings the drive signal down to a level near or below threshold, which in turn intermittently turns off the optical signal output. Returning the optical signal to a desired optical output intensity introduces the speckle reducing oscillation. The pulse frequency, and duty cycle is controlled by a duty cycle control signal to modulate overall optical power and adjust amount of despeckle. | 07-09-2009 |
20090175303 | LIGHT SOURCE MODE ALIGNMENT DEVICE AND METHOD, PASSIVE OPTICAL NETWORK SYSTEM - A light source mode alignment device and method and a passive optical network system are provided. The device includes a laser and a temperature control unit connected to each other and further includes a signal processing unit. The laser converts an incident light into a current signal. The current signal is amplified and converted into a voltage signal via a transimpedance amplifier. Together with a modulation signal generated by the signal processing unit, the voltage signal adjusts a bias voltage of the temperature control unit. | 07-09-2009 |
20090213884 | INTEGRATED PHOTONIC SEMICONDUCTOR DEVICES AND METHODS FOR MAKING INTEGRATED PHOTONIC SEMICONDUCTOR DEVICES - A photonic semiconductor device and method are provided that ensure that the surface of the device upon completion of the SAG process is planar, or at least substantially planar, such that performance of the subsequent processes is facilitated, thereby enabling higher manufacturing yield to be achieved. A photonic semiconductor device and method are also provided that ensure that the isolation region of the device will have high resistance and low capacitance, without requiring the placement of a thick dielectric material beneath each of the contact pads. Eliminating the need to place thick dielectric materials underneath the contact pads eliminates the risk that the contact pads will peel away from the assembly. | 08-27-2009 |
20090252186 | COHERENT LIGHT DISPLAY SYSTEM - A display system includes a coherent light source that can emit a coherent light beam, an optical component that can direct the coherent light beam to a spatial light modulator, a transport mechanism that can move the optical component to produce a movement in the coherent light beam, and a spatial light modulator having a two-dimensional array of mirrors each configured to selectively reflect the coherent light beam either toward a screen surface or away from the screen surface to form a display pixel on the screen surface. A display image is formed on the display screen by display pixels produced by the mirrors that reflect the coherent light beam toward the screen surface. | 10-08-2009 |
20090262765 | SMALL DIMENSION HIGH-EFFICIENCY HIGH-SPEED VERTICAL-CAVITY SURFACE-EMITTING LASERS - A Vertical-Cavity Surface-Emitting Laser (VCSEL) is disclosed, comprising an optical cavity bounded by a top mirror and a bottom mirror, wherein the top mirror has multiple layers of alternating refractive index, of which the bottom three or more layers of the top mirror are deep oxidation layers having an increased oxidation length, a light emitting active region between the top mirror and the bottom mirror, and an aperture with tapered edges between the active region and the top mirror, wherein the aperture has a thickness, a taper length, an oxide aperture length, a taper angle, and an aperture opening diameter designed to reduce an optical mode's diameter without significantly increasing the optical mode's round trip scattering loss. | 10-22-2009 |
20090262766 | ACTIVE TERAHERTZ METAMATERIAL DEVICES - Metamaterial structures are taught which provide for the modulation of terahertz frequency signals. Each element within an array of metamaterial (MM) elements comprises multiple loops and at least one gap. The MM elements may comprise resonators with conductive loops and insulated gaps, or the inverse in which insulated loops are present with conductive gaps; each providing useful transmissive control properties. The metamaterial elements are fabricated on a semiconducting substrate configured with a means of enhancing or depleting electrons from near the gaps of the MM elements. An on to off transmissivity ratio of about 0.5 is achieved with this approach. Embodiments are described in which the MM elements incorporated within a Quantum Cascade Laser (QCL) to provide surface emitting (SE) properties. | 10-22-2009 |
20090268764 | Multisectional laser - Disclosed is a semiconductor laser in which the substrate comprises at least three independent functional sections in the direction of light wave propagation, said functional sections serving different functions and being individually triggered by means of electrodes via electrode leads. An intensification zone, a grid zone, and a phase adjustment zone are provided as functional sections. The light wave is optically intensified in the intensification zone while the phase of the advancing and returning wave is adjusted in the phase adjustment zone. The grid zone is used for selecting the wavelength and adjusting the intensity of coupling between the intensification zone and the phase adjustment zone. | 10-29-2009 |
20090279576 | DUAL OUTPUT LASER SOURCE - A dual output laser source provided on a substrate outputs light from a first and second output. A portion of the light generated by the laser is supplied to a first modulator via the first output. A second portion of the light generated by the laser is supplied to a second modulator via the second output. The first modulator is provided on the substrate and generates a first modulated signal. The second modulator is also provided on the substrate and generates a second modulated signal. Each output of the laser is used to provide continuous wave light sources to components on photonic integrated circuit. | 11-12-2009 |
20090310633 | PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, IMAGE DISPLAY APPARATUS INCLUDING PULSE WIDTH MODULATION SIGNAL GENERATING DEVICE, AND PULSE WIDTH MODULATION SIGNAL GENERATING METHOD - A pulse width modulation signal generating device which generates a pulse width modulation signal for modulating laser beam according to image data includes: a cycle signal output circuit which outputs a cycle signal having a cycle corresponding to a drawing rate for drawing the image data by the laser beam; and a pulse width modulation circuit which receives supply of the image data and the cycle signal and modulates a pulse wave having a cycle determined by the cycle signal by changing duty ratio of the pulse wave based on the image data to produce the pulse width modulation signal. | 12-17-2009 |
20100002736 | Wavelength normalization in phase section of semiconductor lasers - Particular embodiments of the present invention relate generally to semiconductor lasers and laser projections systems and, more particularly, to schemes for controlling semiconductor lasers. According to one embodiment of the present invention, a laser having a gain section, a phase section and a wavelength selective section is configured for optical emission of encoded data. The optical emission is shifted across a plurality of laser cavity modes by applying a quasi-periodic phase shifting signal I/V | 01-07-2010 |
20100054287 | Method and System for Laser-Based High-Speed Digital Marking of Objects - Laser marking system and method are provided. A laser source is configured to supply a laser beam having a first optical intensity level and a respective beam cross-section. A spatial light modulator (SLM) is optically coupled to the laser source to receive the laser beam. The SLM is controlled to generate an output laser beam with an optical pattern containing a data code matrix across the beam cross-section. An optical amplifier is coupled to the SLM to receive the laser beam from the SLM and generate an amplified laser beam containing the same data code matrix as generated by the SLM. The amplified laser beam has a second optical intensity level higher relative to the first intensity level and is selectable to either ablatively or non-ablatively mark a target object with the data code matrix. | 03-04-2010 |
20100080253 | Laser Display System with Optical Feedback Configured to Reduce Speckle Artifacts - An imaging system ( | 04-01-2010 |
20100091805 | OPTICAL SEMICONDUCTOR ELEMENT AND OPTICAL SEMICONDUCTOR DEVICE - An optical semiconductor device includes an optical semiconductor element, a metal pattern and at least one thermal conductive material. The optical semiconductor element has a first optical waveguide region and a second optical waveguide region. The second optical waveguide region is optically coupled to the first optical waveguide region and has a heater for changing a refractive index of the second optical waveguide region. The metal pattern is provided on an area to be thermally coupled to a temperature control device. The thermal conductive material couples the metal pattern with an upper face of the first optical waveguide region of the optical semiconductor element. The thermal conductive material is electrically separated from the first optical waveguide region. | 04-15-2010 |
20100142571 | MULTIPLE DISTRIBUTED FEEDBACK LASER DEVICES - Provided is a multiple distributed feedback laser device. The laser device includes an active layer, a first diffraction grating, and a second diffraction grating. The substrate includes a first distributed feedback region, a modulation region, and a second distributed feedback region. The first diffraction grating is coupled to the active layer in the first distributed feedback region. The second diffraction grating is coupled to the active layer in the second distributed feedback region. In addition, the laser device includes a first micro heater and a second micro heater. The first micro heater supplies heat to the first diffraction grating. The second micro heater supplies heat to the second diffraction grating. The first micro heater and the second micro heater are controlled independently from each other. | 06-10-2010 |
20100150188 | SEED LIGHT MODULE FOR PASSIVE OPTICAL NETWORK - A spectrum-sliced seed light module for a wavelength division multiplexing passive optical network (WDM PON) is provided. The seed light module includes an optical amplifier to amplify seed light, an optical wavelength filter to transmit broadband light, which is output in opposite direction to an output direction of the seed light, at periodic frequency intervals, and a reflective mirror to reflect light which is spectrum-sliced through the optical wavelength filter to the optical wavelength filter. | 06-17-2010 |
20100232461 | BIAS SIGNAL GENERATION FOR A LASER TRANSMITTER IN A PASSIVE OPTICAL NETWORK - The teachings presented herein disclose a method and apparatus for controlling the optical power of a laser in a passive optical network transmitter that outputs a modulated optical signal responsive to a modulated input signal. In one or more embodiments, such a control method comprises detecting the voltage of the modulated input signal, and setting the DC bias level of the laser as a function of the detected voltage. These teachings may be implemented, for example, by a laser control circuit in the transceiver module of an optical network unit (“ONU”). Such an ONU may be advantageously used in a hybrid coaxial cable-optical fiber network, such as used in DPONs which interface cable system subscriber equipment to cable system head-end equipment. | 09-16-2010 |
20100246617 | NARROW SURFACE CORRUGATED GRATING - Narrow surface corrugated gratings for integrated optical components and their method of manufacture. An embodiment includes a grating having a width narrower than a width of the waveguide on which the grating is formed. In accordance with certain embodiments of the present invention, masked photolithography is employed to form narrowed gratings having a desired grating strength. In an embodiment, an optical cavity of a laser is formed with a reflector grating having a width narrower than a width of the waveguide. In another embodiment an integrated optical communication system includes one or more narrow surface corrugated gratings. | 09-30-2010 |
20100254417 | Method Of Controlling A Frequency-Converted Laser Source Comprising An External Optical Feedback Component - A method of controlling a frequency-converted laser source is provided where the laser source comprises a laser cavity, an external optical feedback component, a wavelength selective component, and a wavelength conversion device and the method comprises driving a gain section of the laser cavity with a gain signal that comprises a data component and a modulation component. The modulation component of the gain signal comprises a gain modulation amplitude I | 10-07-2010 |
20100254418 | LASER BEAM IRRADIATION APPARATUS - [Problems] A laser beam irradiation apparatus which can accurately perform a linear welding with a uniform width on an irradiation portion even if the overlap ratio is lowered is provided. | 10-07-2010 |
20100290489 | ELECTRO-ABSORPTION MODULATED LASER (EML) ASSEMBLY HAVING A 1/4 WAVELENGTH PHASE SHIFT LOCATED IN THE FORWARD PORTION OF THE DISTRIBUTED FEEDBACK (DFB) OF THE EML ASSEMBLY, AND A METHOD - An EML assembly is provided that has and EAM and a DFB, with the DFB having an asymmetric ¼ wavelength phase shift positioned at a location that is in front of the center of the periodic structure of the DFB. In addition, the EML assembly has a tilted or bent waveguide that reduces reflections occurring at the front end facet, thereby enabling the EAM to produce a relatively high P | 11-18-2010 |
20100322271 | METHOD FOR DRIVING OPTICAL TRANSMITTER - A method to control an LD (laser diode) is disclosed. The method compares the operating temperature of the LD with a transition temperature. When the former temperature exceeds the latter, the modulation current is set based on the bias current, which is independently determined by the APC loop. On the other hand, the operating temperature is less than the transition temperature; the modulation current is determined by the operating temperature. | 12-23-2010 |
20110032959 | COUNTING DEVICE, PHYSICAL QUANTITY SENSOR, COUNTING METHOD AND PHYSICAL QUANTITY MEASURING METHOD - The counting device includes: a signal counter that counts the number of half cycles of input signals during given counting periods; a signal half cycle measurement unit that measures the half cycles; a frequency distribution generator that generates a frequency distribution of the half cycles; a representative value calculator configured to calculate a representative value of a distribution of the half cycles; a correction value calculator configured to calculate a total number Ns and a total number Nw | 02-10-2011 |
20110110388 | METHOD AND APPARATUS FOR REDUCING THE AMPLITUDE MODULATION OF OPTICAL SIGNALS IN EXTERNAL CAVITY LASERS - The present invention concerns a laser apparatus ( | 05-12-2011 |
20110176564 | Methods of Modulating a Quantum Dot Laser and a Multisection Quantum Dot Laser - A multisection quantum dot laser ( | 07-21-2011 |
20110310918 | LASER MODULE - Provided is a laser module. The laser module comprises: a substrate; an gain unit oscillating a laser light on the substrate; an external resonance reflecting unit total-reflecting the laser light at an external of the substrate adjacent to one side of the gain unit; and an inner resonance reflecting unit reflecting the laser light to the external resonance reflecting unit at the substrate between the modulating unit and gain unit and outputting the laser light to the modulating unit. | 12-22-2011 |
20120002688 | METHOD AND SYSTEM USING PHASE MODULATION TO REDUCE SPECTRAL BROADENING - A laser system includes a seed laser operable to output a seed laser signal along an optical path and a phase modulator disposed along the optical path and operable to receive the seed laser signal. The laser system also includes a phase modulator driver coupled to the phase modulator. A drive signal from the phase modulator driver is operable to produce, as an output from the phase modulator, an unmodulated seed laser signal when the drive signal is associated with a first state and a modulated seed laser signal when the drive signal is associated with a second state. The laser system further includes a fiber amplifier disposed along the optical path and operable to receive the output of the phase modulator. A spectral bandwidth of an output of the fiber amplifier associated with the second state is less than a spectral bandwidth of the output of the fiber amplifier associated with the first state. | 01-05-2012 |
20120099612 | BANDWIDTH NARROWING MODULE FOR SETTING A SPECTRAL BANDWIDTH OF A LASER BEAM - The disclosure provides a bandwidth narrowing module for setting a spectral bandwidth of a laser beam of a laser light source. The bandwidth narrowing module includes a beam expanding module for expanding a laser beam transversely with respect to a propagation direction of the laser beam and comprising a reflection grating. A first optical component of the bandwidth narrowing module is configured so that a disturbance with a cylindrical portion about a first axis transversely with respect to an optical axis of the bandwidth narrowing module can be impressed on a wavefront of a laser beam. The first optical component is embodied such that it is pivotable about a pivoting axis parallel to the first axis. | 04-26-2012 |
20120195334 | LASER MATERIAL PROCESSING TOOL - An apparatus for laser drilling including a laser beam emitter disposed within a housing having at least one laser beam outlet and at least one purge fluid outlet. At least one actuated nozzle is disposed within the housing for providing a purge fluid through the purge fluid outlet and having functional control for synchronized programmable activation patterns. Laser beam control is provided for directing a laser beam over a target surface. | 08-02-2012 |
20120236884 | LASER APPARATUS - This disclosure is directed to widen an adjustable range of the spectral linewidth of laser light output from a laser apparatus. This laser apparatus may include: (1) an excitation source configured to excite a laser medium in a laser gain space, (2) an optical resonator including an output coupler arranged on one side of an optical path through the laser gain space and a wavelength dispersion element arranged on the other side of the optical path through the laser gain space, and (3) a switching mechanism configured to switch a beam-width magnification or reduction factor by placing or removing at least one beam-width change optical system for expanding or reducing a beam width in or from an optical path between the laser gain space and the wavelength dispersion element or by inverting orientation of the at least one beam-width change optical system in the optical path. | 09-20-2012 |
20120250711 | Optical Module - An optical module providing higher reliability during high-speed light modulation and a lower bit error rate when built into a transmitter (transceiver). An optical module contains a taper mirror for surface emission of output light, an optical modulator device, and an optical modulation drive circuit, and the optical modulator device and the optical modulation drive circuit are mounted at positions so as to enclose the taper mirror. | 10-04-2012 |
20120257645 | BEAT SIGNAL GENERATING DEVICE FOR USE IN A TERAHERTZ SYSTEM, TERAHERTZ SYSTEM AND USE OF A BEAT SIGNAL GENERATING DEVICE - The invention relates to a beat signal generating device for use in a Terahertz system, comprising
| 10-11-2012 |
20120327961 | AMPLITUDE AND PHASE MODULATION OF A LASER BY MODULATION OF AN OUTPUT COUPLER - There is provided an output coupler modulated laser. The laser includes an optical resonator for light to circulate within, a gain medium housed within the optical resonator and a pump. An output coupler included in the optical resonator is responsive to a control signal to generate a modulated optical signal at a laser output port, and a complementary signal at a through port to retain circulating light within the optical resonator. The output coupler and the pump are jointly controllable to maintain the power level of the circulating light substantially at a selected, steady state level, and to decouple the modulation response of the laser from the intrinsic response of the circulating light due to interaction with the gain medium. The output coupler is configurable for simple amplitude modulation, Phase-Shift Keying (PSK), Quadrature Amplitude Modulation (QAM), and is suitable for use with high-finesse, micron or millimeter scale resonators. | 12-27-2012 |
20130142207 | PULSE COMPRESSION SYSTEMS AND METHODS - A non-linear FM pulse compression system includes a non-linear FM transmitter adapted to receive an input signal and transmit an output signal. The non-linear FM transmitter is adapted to modulate the frequency of the output signal by at least one of the following: increasing the frequency of the output signal as a logarithmic function of the frequency of samples in the input signal; modulating the frequency of the output signal in inversely proportional relationship to the frequency of samples in the input signal; and modulating the frequency of the output signal according to a random permutation of the frequency of the input signal. At least one antenna interfaces with the non-linear FM transmitter. A non-linear FM receiver interfacing with the at least one antenna. The non-linear FM receiver is adapted to auto-correlate the output signal with a return signal. | 06-06-2013 |
20130148674 | LASER APPARATUS, EXTREME ULTRAVIOLET LIGHT GENERATION SYSTEM, METHOD FOR CONTROLLING THE LASER APPARATUS, AND METHOD FOR GENERATING THE EXTREME ULTRAVIOLET LIGHT - A laser apparatus may include: a master oscillator configured to output a pulsed laser beam at a repetition rate, the master oscillator including at least one semiconductor laser apparatus; at least one amplifier configured to amplify the pulsed laser beam from the master oscillator, the at least one amplifier being configured to include at least one gain bandwidth; and a controller for controlling a parameter affecting an output wavelength of the pulsed laser beam from the master oscillator such that a wavelength chirping range of the pulsed laser beam from the master oscillator overlaps at least a part of the at least one gain bandwidth. | 06-13-2013 |
20130163624 | LASER DEVICE - A laser device including a plurality of oscillating means for oscillating a plurality of laser lights being continuous lights and having frequencies different from each other, respectively, multiplexing means for multiplexing, after amplifying or without amplifying, the respective laser lights oscillated from the respective oscillating means at a predetermined position to generate a multiplexed light, and phase control means for controlling the phase of each of the laser lights so that a peak in output of the multiplexed light repeatedly appears at predetermined time intervals at the predetermined position (so that the same pulse temporal waveform repeatedly appears at predetermined time intervals). | 06-27-2013 |
20130266033 | MODAL FILTERS FOR MODULATABLE SOURCES - A system includes a modulatable source and matched modal filter. The modulatable source is associated with a plurality of source modes to provide a generated signal. The matched modal filter is coupled to the modulatable source to receive the generated signal. Filter modes are to match the source modes. The matched modal filter is coupleable to a link fiber to provide a signal to the link fiber. The filter modes are to match a subset of link fiber modes to couple the plurality of filter modes to the link fiber. | 10-10-2013 |
20130272326 | MODULATOR INTEGRATED LASER DEVICE - An integrated optical modulator and laser device includes a laser section, a modulator section for modulating the intensity of a laser beam produced by the laser section, and a separation section located between the laser section and the modulator section. The laser section includes a first anode electrode and a first cathode electrode. The modulator section includes a second anode electrode and a second cathode electrode. A lower cladding layer is integral to the laser section, the modulator section, and the separation section and the width of the lower cladding layer is narrowest in the separation section. | 10-17-2013 |
20130272327 | Device for Amplifying a Laser Beam - A device for amplifying a laser beam is provided. The device includes at least one amplifier chamber in which a laser-active material is provided, at least one transmitting optical member delimiting the amplifier chamber and being arranged at a tilt angle, α, with respect to a plane oriented perpendicularly with respect to an optical axis of the laser beam, and at least one detection unit. The laser beam is reflected by the transmitting optical member into a back reflected laser beam, and the detection unit is arranged such that it detects the back reflected laser beam. | 10-17-2013 |
20130322474 | MULTI-COLOR HARMONIC SYNTHESIZED LASER SYSTEM FOR LASER PROCESSING AND LASER PROCESSING METHOD USING MULTI-COLOR HARMONIC SYNTHESIZED LASER - A multi-color harmonic synthesized laser system for laser processing and a laser processing method using multi-color harmonic synthesized laser are disclosed. The multi-color harmonic synthesized laser system includes a laser source for providing a single laser wave, a converter for converting the single laser wave into a plurality of harmonic waves with different frequencies, and a modulating unit for modulating amplitudes and relative phases of the harmonic waves to form a plurality of modulated harmonic waves, so as to synthesize the modulated harmonic waves as a single synthesized laser wave, wherein the single synthesized laser wave is focused on an object to perform a laser processing. The converter includes a plurality of non-linear crystals for converting the single laser wave into a fundamental harmonic wave and a plurality of multi-frequency harmonic waves. The harmonic waves are coherent and collinear, and the phases of the harmonic waves are related to one another. | 12-05-2013 |
20130329758 | Spatially Combined Laser Assembly And Method Of Combining Laser Beams - A diode laser assembly including a plurality of diode bars disposed on a generally flat base plate and being oriented to emit a plurality of laser beams in a first direction. A reflector is spaced in the first direction from each of the diode bars in the first. Each reflector has at least two reflecting surfaces, one for reflecting the laser beams into a second direction different from the first direction and the other for reflecting the laser beams into a third direction different from the first and second directions to produce a spatially combined laser beam. Each reflector is moveable relative to one another and to the diode bars for adjusting the individual laser beams within the spatially-combined laser beam for optimizing the quality of the spatially combined laser beam. | 12-12-2013 |
20130336346 | OPTICAL COUPLING TECHNIQUES AND CONFIGURATIONS BETWEEN DIES - Embodiments of the present disclosure provide optical connection techniques and configurations. In one embodiment, an opto-electronic assembly includes a first semiconductor die including a light source to generate light, and a first mode expander structure comprising a first optical material disposed on a surface of the first semiconductor die, the first optical material being optically transparent at a wavelength of the light, and a second semiconductor die including a second mode expander structure comprising a second optical material disposed on a surface of the second semiconductor die, the second material being optically transparent at the wavelength of the light, wherein the second optical material is evanescently coupled with the first optical material to receive the light from the first optical material. Other embodiments may be described and/or claimed. | 12-19-2013 |
20140072002 | Method and System for Operating Semiconductor Optical Amplifiers - Disclosed are systems and methods for using a semiconductor optical amplifier (SOA) as an optical modulator for pulsed signals. In accordance with the principles of the invention, the SOA can be biased with a negative voltage to suppress transmission and improve modulator extinction and biased with a positive pulsed signal with sufficient amplitude to forward bias the amplifier (SOA), both transmitting the carrier and increasing its amplitude by means of a gain provided by the SOA under forward biased conditions. In addition, the forward bias voltage may be selected to compensate for losses within the SOA. | 03-13-2014 |
20140072003 | LASER PROCESSING MACHINE - A laser processing machine includes a plurality of collimating lenses to convert a laser beam from a laser oscillator, which have been emerged from a point of emergence of a transmission optical fiber, into parallel rays of light, a condensing lens to condense the laser beam and then radiate it onto a work, and a nozzle positioned on one side of the work remote from the condensing lens. The distance from the point of emergence to the tip of the nozzle remains unchangeable. The collimating lenses are spaced from each other in a direction parallel to an optical axis. A switching device switches the position of each of the collimating lenses in the orthogonal direction so that the center of one of the collimating lenses may be aligned with a center of the laser beam. The collimating lenses have respective focal lengths that are different from each other. | 03-13-2014 |
20140185636 | Modulation of Vertical Cavity Laser (VCSEL) For Enhanced Range of Multi-Modal Fiber Communication - Technologies are described for enabling VCSELs to transmit phase or frequency modulated signals, which may have a substantially smaller transmission bandwidth and are more robust to transmission in a highly dispersive media such as multi-mode fibers. By applying an electric, magnetic, or electromagnetic field across one or more reflector layers of the VCSEL, a refractive index of the reflector layer(s) may be modified. The VCSEL may then be excited and the laser beam generated by the VCSEL phase-modulated by modifying a magnitude of the applied field. | 07-03-2014 |
20140314109 | DIRECT MODULATED LASER - A laser system can include an electrode to transmit electrical carriers into an active region in response to first electrical stimulation. The laser system can also include another electrode to transmit electrical carriers into the active region in response to second electrical stimulation. The electrical carriers can be combined in the active region to emit photons to generate an optical signal. The system can further include yet another electrode responsive to electrical stimulation to affect a concentration of electrical carriers in a device layer to change a capacitance of an internal capacitance region associated with at least one of first and second waveguide regions and the device layer. The third electrical stimulation can be modulated to modulate the optical signal based on the change to the capacitance of the internal capacitance region. | 10-23-2014 |
20140376577 | VARIABLE BANDGAP MODULATOR FOR A MODULATED LASER SYSTEM - A modulated laser system generally includes a light emission region, a modulation region having a plurality of semiconductive layers, at least one of which includes a quantum well layer having a variable energy bandgap, and an isolation region separating the light emission region and the modulation region. The laser may be an electro-absorption modulated laser, the light emission region may include a distributed feedback laser, and the modulation region may include an electro-absorption modulator. The laser may be manufactured by forming a lower semiconductive buffer layer on a substrate, an active layer including one or more quantum well layers having the variable energy bandgap on or above the lower semiconductive buffer layer, an upper semiconductive buffer layer on or above the active layer, a contact layer on or above the upper semiconductive buffer layer, and an isolation region separating the light emission region and the modulation region. | 12-25-2014 |
20150131684 | SURFACE-EMITTING LASER APPARATUS, OPTICAL MODULE, AND METHOD OF DRIVING SURFACE-EMITTING LASER ELEMENT - A surface-emitting laser apparatus includes: a surface-emitting laser element; and a driving apparatus supplying a modulation-driving current to the surface-emitting laser element. The modulation-driving current is intensity-modulated to vary across a value of a bias current. The number of lateral modes of laser oscillation of the surface-emitting laser element changes from one to three at maximum in accordance with a value of the modulation-driving current. Among changing currents at which number of the lateral modes of the laser oscillation of the surface-emitting laser element changes, if a first changing current is defined at which the number of the lateral mode of the laser oscillation changes from one to two, the driving apparatus supplies the modulation-driving current to the surface-emitting laser element. The modulation-driving current is set so that a value of the first changing current is not between the bias current and a maximum value of the modulation-driving current. | 05-14-2015 |
20150318667 | BEAM STEERING MODULATED VCSEL - A VCSEL can include: an electro-optic modulator between a lasing active region and a light emitting surface. The electro-optic modulator can include: an electro-optically active region; a modulator mirror region over the electro-optically active region; and at least one electrical insulator region separating the modulator mirror region into at least two separate modulator mirror cavities electrically isolated from each other, wherein each separate modulator mirror cavity and a longitudinally aligned portion of the electro-optically active region form an electro-optic modulator cavity. A method of emitting light from a VCSEL can include: emitting a laser beam from the lasing active region along a longitudinal axis; and changing a refractive index of one electro-optic modulator cavity so as to steer the laser beam from the longitudinal axis. | 11-05-2015 |
20150380890 | LIGHT SOURCE DEVICE AND IMAGING APPARATUS USING THE SAME - A light source device includes an optical resonator that includes an optical gain medium amplifying light and an optical waveguide having wavelength dispersion of a refractive index, and an optical modulator that modulates an intensity of the light in the optical resonator. An oscillation wavelength of an optical pulse is varied according to a modulation frequency of the optical modulator. The optical modulator can adjust transmittance of the light passing through the optical modulator, and a duty ratio of a transmission time of the light passing through the optical modulator is less than 50%. | 12-31-2015 |
20160064894 | SEMICONDUCTOR LASER DEVICE - This semiconductor laser device includes a semiconductor laser chip and a spatial light modulator SLM which is optically connected to the semiconductor laser chip. The semiconductor laser chip LDC includes an active layer | 03-03-2016 |
20160190766 | OPTICAL RESONATOR SYSTEM - It has been very difficult to accumulate strong laser in the conventional optical resonator, because firstly it has been very difficult to control a resonator length less than 1 Å in resonation position which is required for the laser amplification more than 1,000 times and secondly, the conventional method has utilized laser strength of amplified laser in the optical resonator as the resonance control signal. | 06-30-2016 |
20160380405 | SEMICONDUCTOR LASER DEVICE - This semiconductor laser device includes a semiconductor laser chip and a spatial light modulator SLM which is optically connected to the semiconductor laser chip. The semiconductor laser chip LDC includes an active layer | 12-29-2016 |
20170237228 | MICROFABRICATED OPTICAL APPARATUS | 08-17-2017 |
20180026418 | Coherent Combining Pulse Bursts In Time Domain | 01-25-2018 |