|| List of recent Lasers-related patents
|Method for the adaptive configuration of the transmission spectrum in wdm-pons|
A method for adaptive configuration of a transmission signal in a coherent wavelength-division multiplexing-passive optical network (wdm-pon) having an optical line termination and a plurality of end nodes includes: (a) generating, by at least m lasers, the transmission signal; (b) monitoring the ka active end nodes; (c) if the number of active end nodes is reduced to ka≦(m−1)·p: reassigning active end nodes associated with a spectral range of a laser to be switched off to a respective free spectral range of another laser, announcing the new assignment of the spectral ranges by transmitting a message to one or more end nodes assigned to the laser to be switched off, and switching off the laser to be switched off; and (d) if the number of active end nodes increases to ka>(m−1)·p: switching on an additional laser.. .
Deutsche Telekom Ag
|Laser spike annealing using fiber lasers|
The disclosure is directed to laser spike annealing using fiber lasers. The method includes performing laser spike annealing of a surface of a wafer by: generating with a plurality of fiber laser systems respective cw output radiation beams that partially overlap at the wafer surface to form an elongate annealing image having a long axis and a length la along the long axis; heating at least a region of the wafer to a pre-anneal temperature tpa; and scanning the elongate annealing image over the wafer surface and within the pre-heat region so that the annealing image has a dwell time td in the range 30 ns≦td≦10 ms and raises the wafer surface temperature to an annealing temperature ta..
Projector methods, devices, software are described for a high decrease of the black level without decrease or a limited decrease of the luminance of the bright pixels for use with high contrast and high dynamic range projectors, e.g. Based on rgb lasers or phosphor converted lasers.
|Spectral alignment of a wdm device to a specified frequency grid|
A wdm device having a controller that individually controls the operating parameters of tunable lasers and the temperatures of an optical multiplexer and etalon. The device employs a spectral analyzer to measure the spectral composition of the optical output signal produced by the device.
Alcatel-lucent Usa Inc.
|Sub 200nm laser pumped homonuclear excimer lasers|
Disclosed are methods and apparatus for generating a sub-200 nm continuous wave (cw) laser. A laser apparatus includes a chamber for receiving at least a rare gas or rare gas mixtures and a pump laser source for generating at least one cw pump laser focused in the chamber for generating at least one laser-sustained plasma in the chamber.
|Diode laser fiber array for powder bed fabrication or repair|
A method of forming a build in a powder bed includes emitting a plurality of laser beams from selected fibers of a diode laser fiber array onto the powder bed, the selected fibers of the array corresponding to a pattern of a layer of the build; and simultaneously melting powder in the powder bed corresponding to the pattern of the layer of the build. An apparatus for forming a build in a powder bed includes a diode laser fiber array including a plurality of diode lasers and a plurality of optical fibers corresponding to the plurality of diode lasers, each optical fiber configured to receive a laser beam from a respective diode laser and configured to emitting the laser beam; a support configured to support a powder bed or a component configured to support the powder bed at a distance from ends of the optical fibers; and a controller configured to control the diode laser fiber array to emit a plurality of laser beams from selected fibers of the diode laser fiber array onto the powder bed, the selected fibers of the array corresponding to a pattern of a layer of the build and simultaneously melt the powder in the powder bed corresponding to the pattern of the layer of the build..
General Electric Company
|Analytical laser ablation of solid samples for icp, icp-ms, and fag-ms analysis|
This invention is improved laser ablation of solid samples analyzed by inductively coupled plasma (icp), icp mass spectrometry, or flowing afterglow mass spectrometry. A mirror-with-hole eliminates chromatic aberration in sample viewing and allows rad-hardening for radiation hot cell analysis of nuclear waste.
|Edge chamfering methods|
Processes of chamfering and/or beveling an edge of a glass or other substrate of arbitrary shape using lasers are described herein. Three general methods to produce chamfers on glass substrates are disclosed.
|Substrate-emitting transverse magnetic polarized laser employing a metal/semiconductor distributed feedback grating for symmetric-mode operation|
Semiconductor lasers comprise a substrate; an active layer configured to generate transverse magnetic (tm) polarized light under an electrical bias; an upper cladding layer; a lower cladding layer; and a distributed feedback (dfb) grating defined by the interface of a layer of metal and a layer of semiconductor under the layer of metal, the interface periodically corrugated in the longitudinal direction of the laser with a periodicity of Λdfb=mλ/(2neff), wherein m>1. The dfb grating is configured such that loss of one or more antisymmetric longitudinal modes of the laser structure via absorption to the dfb grating is sufficiently maximized so as to produce lasing of a symmetric longitudinal mode of the laser with laser emission characterized by a single-lobe beam along each direction defined by the grating diffraction orders corresponding to emission away from the plane of the grating..
Wisconsin Alumni Research Foundation
|Bunch length compression free electron lasers to avoid parasitic compressions|
A method of bunch length compression method for a free electron laser (fel) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the rf waveform, 2) compressing using a positive momentum compaction (r56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.. .
Jefferson Science Associates, Llc
Broadband generation of mid ir, coherent continua with optical fibers
Coherent and compact supercontinuum light sources for the mid ir spectral regime are disclosed and exemplary applications thereof. The supercontinuum generation is based on the use of highly nonlinear fibers or waveguides.
Imra America, Inc.
System and determining the position of objects in a radiation room for radiation therapy
A system and method for determining the position of objects in a radiation room for radiation therapy comprises several room lasers arranged in the radiation room, each of which is designed for patient positioning to project at least one laser line onto the surface of a patient located on a patient table in the radiation room. At least one camera detects at least one laser line projected onto the surface of the patient by at least one of the room lasers, and an evaluation and control apparatus determines the coordinate points along the laser line projected onto the surface of patient during a radiation procedure based on measurement values detected by the camera through a real-time triangulation process and compares them with target coordinate points.
Lap Gmbh Laser Applikationen
Operating vertical-cavity surface-emitting lasers
Methods, systems, and devices are provided for operating a vertical-cavity surface-emitting laser. Operating a vertical-cavity surface-emitting laser can include determining an output voltage of a vertical-cavity surface-emitting laser driver, determining a relationship between the output voltage and a reference voltage, and adjusting an output current of the vertical-cavity surface-emitting laser driver based, at least in part, on the determined relationship..
Laser module for homogeneous line-shaped intensity profiles
The present invention relates to a laser module comprising several sub-modules (1) arranged side by side along a first axis (10) on a common carrier. Each of said sub-modules (1) comprises a laser area (8) formed of one or several arrays of semiconductor lasers arranged on a surface of the sub-module (1).
Koninklijke Philips N.v.
Optical engine for flow cytometer, flow cytometer system and methods of use
An optical engine for use in a bench top flow cytometer, the optical engine comprising a set of lasers; a different set of beam shaping optics for each laser, wherein each set comprises two lenses to adjustably focus light horizontally along an x-axis to a same horizontal position and vertically along a y-axis to a different vertical position along a same plane; collection optics for collecting fluorescence from the flow cell; filtration optics that filter the collected fluorescence from the flow cell into different detection channels according to wavelength ranges; and a detector for each detection channel that converts the filtered fluorescence to electrical signals, wherein electrical signals are processed so that the fluorescence from each laser at the different vertical positions is distinguished at the same detector.. .
Acea Biosciences, Inc.
Soft-tissue laser surgery
In dentistry very often soft tissue has to be cut. It has become customary to cut soft tissue, in particular gum or gingiva, or to disinfect pockets in the gingiva that exist at the neck of teeth with the help of laser light.
Sirona Dental Systems Gmbh
Sagnac loop mirror based laser cavity on silicon photonics platform
We have demonstrated a novel sagnac loop and micro-ring based laser cavity which is simple and reliable, with accurately controlled reflectivity and negligible excess loss. The resonant wavelength of a 2 μm radius micro-ring is shown to be lithographically controlled to a standard deviation of 3.6 nm.
Coriant Advanced Technology, Llc
Reducing the spectral bandwidth of lasers
A laser system for semiconductor inspection includes a fiber-based fundamental light source for generating fundamental light that is then converted/mixed by a frequency conversion module to generate uv-duv laser light. The fundamental light source includes a nonlinear chirp element (e.g., a bragg grating or an electro-optic modulator) that adds a nonlinear chirp to the seed light laser system prior to amplification by the fiber amplifier(s) (e.g., doped fiber or raman amplifiers).
Phosphor ceramics and methods of making the same
Electric sintering of precursor materials to prepare phosphor ceramics is described herein. The phosphor ceramics prepared by electric sintering may be incorporated into devices such as light-emitting devices, lasers, or for other purposes..
Quantum cascade lasers with improved performance using interface roughness scattering
A quantum cascade laser and method of making are disclosed. The quantum cascade laser includes a plurality stages configured in a cascade structure, each stage having a quantum well emission layer and an injection layer, each stage having an upper laser level and a lower laser level.
Synthetic wave laser ranging sensors and methods
Systems and methods for measuring a distance to an object. An exemplary method includes directing light beams from three or more continuous-wave lasers onto a target to generate an interference beam, and also frequency shifting the light beams split off from the lasers to generate local oscillator beams.
Apparatus and profiling a depth of a surface of a target object
An apparatus (1) for profiling the depth of a surface of a target object (30), having a two-dimensional array of lasers (5), an optical device (15) for projecting a two-dimensional illumination pattern (31) onto an area of the surface of the target object, an image capture device (10) arranged to capture an image of the two-dimensional illumination pattern projected onto the area of the surface of the target object and a processor (25) configured to process the captured image in order to reconstruct a depth profile of the two-dimensional area of the surface of the target object from the image captured by the image capture device.. .
An optical magnetometer is disclosed. The device includes a cell filled with a substance that has a magnetic moment, such as an alkali metal.
Disruptor device simulation system
A disruptor device simulation system is described. Embodiments of the of the simulation system include a disruptor device, one or more training cartridges, and a simulator system.
Ti Training Corp.
Efficient optical communication device
In one embodiment, an apparatus for optical communication is disclosed. An optical sub-assembly and optical platform may form the apparatus.
Cisco Technology, Inc.
Lasers with beam shape and beam direction modification
A reflective surface is disclosed in conjunction with a semiconductor laser to shape a laser beam and modify a direction of the laser beam. The reflective surface may be formed on a structure disposed adjacent to a laser structure to allow high coupling of laser light to, for example, a silicon photonics chip or an optical fiber..
Multiple beam combiner for laser processing apparatus
Apparatus and methods for combining beams of amplified radiation are disclosed. A beam combiner has a collimating optic positioned to receive a plurality of coherent radiation beams at a constant angle of incidence with respect to an optical axis of the collimating optic.
Applied Materials, Inc.
Dual resonance pumped two-photon absorption optical filter
An apparatus is disclosed for filtering of probe light. The apparatus includes an optical filter comprised of a medium circular birefringence between crossed polarizers.
Edge-emitting etched-facet lasers
A laser chip having a substrate, an epitaxial structure on the substrate, the epitaxial structure including an active region and the active region generating light, a waveguide formed in the epitaxial structure extending in a first direction, the waveguide having a front etched facet and a back etched facet that define an edge-emitting laser, and a first recessed region formed in the epitaxial structure, the first recessed region being arranged at a distance from the waveguide and having an opening adjacent to the back etched facet, the first recessed region facilitating testing of an adjacent laser chip prior to singulation of the laser chip.. .
Laser processing system using broad band pulsed lasers
A laser material processing system which includes a pulsed fiber laser source having a continuous wavelength bandwidth of larger than 100 nm and pulse width of from 100 femtosecond to 1 microsecond, a broad band laser emitted from one core of an optical fiber, where the broad band laser is applied to a subject material to produce removal of the subject material and/or color change of the subject material.. .
High power femtosecond laser with variable repetition rate
Designs and techniques for constructing and operating femtosecond pulse lasers are provided. One example of a laser engine includes an oscillator that generates and outputs a beam of femtosecond seed pulses, a stretcher-compressor that stretches a duration of the seed pulses, and an amplifier that receives the stretched seed pulses, amplifies an amplitude of selected stretched seed pulses to create amplified stretched pulses, and outputs a laser beam of amplified stretched pulses back to the stretcher-compressor that compresses their duration and outputs a laser beam of femtosecond pulses.
Alcon Lensx, Inc.
Operating vertical-cavity surface-emitting lasers
Methods, systems, and computer-readable mediah are provided for operating a vertical-cavity surface-emitting laser. Operating a vertical-cavity surface-emitting laser can include sending a signal to a driver to decrease an optical power of a vertical cavity surface emitting laser transmitter, and sending a signal to the driver associated with increasing the optical power by a particular amount in response to determining that the optical power is insufficient for reception by a receiver..
Single-mode quantum cascade lasers with enhanced tuning range
In one aspect, semiconductor lasers are provided. A semiconductor laser described herein comprises substrate and a cavity formed on the substrate, the cavity comprising an asymmetric mach-zehnder (amz) interferometer structure positioned between two straight waveguide segments, the straight waveguide segments and first and second arms of the amz interferometer structure comprising epitaxial semiconductor layers, wherein the second arm of the amz interferometer structure has a temperature control architecture independent of the first arm..
The invention relates to the field of optoelectronics, and may be used in devices and of visualization, displaying, storage and processing of information, in particular in projection displays, etc. Video projector consists of a liquid crystal micro display based on structure flcos, and an optical unit of reading the information formed in the structure flcos, containing a light source and projection optics, optically coupled to the structure flcos, and a screen, onto which the information is projected.
Laser assisted machining system for ceramics and hard materials
An improved apparatus and method for laser assisted machining are provided, by utilizing a computer to develop interrelated heating and machining plans, from a variety of input data describing the material to be machined, the properties of lasers and pyrometers used for heating the material, and computer models of the machining arrangement, workpiece and final part to be produced. An iterative process continues until the machining and heating plans result in the cutting zone of the workpiece being maintained at a desired temperature with no obstruction in the line-of-sight of at least one laser and pyrometer throughout the machining process, while also maintaining the cutting tool at or below a desired maximum temperature..
Board Of Trustees Of Northern Illinois University
Tapered-waveguide high-power quantum cascade lasers
An improved quantum cascade laser, the improvement comprising a longitudinally non-uniform dielectric waveguide. The waveguide includes a longitudinally straight section and a longitudinally tapered section.
System and controlling collocated multiple wavelength tuned lasers
Systems and methods are disclosed herein for controlling laser beams for a plurality of collocated laser assemblies. The laser beams are optimized by controlling outputs of a primary power source (current for generating a laser beam) and a secondary power source (heating device) for each of the respective laser assemblies.
Automotive Coalition For Traffic Safety, Inc.
Dynamically-distributable multiple-output pump for fiber optic amplifier
A multiple-output laser component is described with a plurality of diode lasers in a common package, each of the diode lasers having distinct electrical control and optically coupled to a distinct output fiber, the component configured such that up to a maximum total output power can be selectively and dynamically partitioned among said diode lasers. The dynamic allocation can be based on demand for laser power in a fiber optic coupled to each diode laser.
Systems and methods for cooling disk lasers
A cooling device for cooling heat-generating devices such as disk laser according to a desired thermal profile to generate desired edge effects and optical properties. An example cooling device includes a back plate for supporting the heat-generating device.
Logos Technologies, Llc
Upstream scheduling in a passive optical network
In general, the 1g-epon standard specifies its upstream waveband broadly to allow for low cost lasers to be used to transmit upstream. Often, however, the lasers actually used by many 1g-onus to transmit upstream only occupy a narrow waveband that does not overlap with the upstream waveband specified by the 10g-epon standard.
Optically pumped vertical external-cavity surface-emitting laser device
The present invention relates to an optically pumped vertical external-cavity surface-emitting laser device comprising at least one vecsel (200) and several pump laser diodes (300). The pump laser diodes (300) are arranged to optically pump the active region (108) of the vecsel (200) by reflection of pump radiation (310) at a mirror element (400).
Koninklijke Philips N.v.
Interactive play center
An entertainment venue, amusement attraction, or interactive play center configured to provide a variety of activities for users. The attraction may include blaster cannons, sorting stations, fountain components, registration stations, video monitors, targets, and other interactive elements.
Medical system for treating deep surface targets
Disclosed herein are medical systems involving the novel use of lasers in a way to transfer a desired amount of energy to deeper tissues, such as deep dermis, fat, deep vessels, fascia, tumors and others, without burning the skin, in particular the skin surface. A medical system (10) comprises a laser beam delivery system (21) producing a plurality of laser beams (1a-1d) for simultaneously or alternately irradiating the deep tissue target structure (5) from multiple directions via the skin surface (2), wherein the laser beams (1a-1d) individually are individually adjusted to have an energy level insufficient to ablate and/or burn the skin (2).
Method and laser marking objects
Embodiments of the present invention comprise an apparatus for laser marking individual objects with indicia at a marking station wherein a predetermined window exists during which each object can be marked as the objects are conveyed along at least one path at a predetermined speed, the apparatus comprising, at least first and second lasers positioned adjacent one or more paths configured to direct a laser beam onto the objects to mark the same with indicia as the objects pass through the marking station, with each of the first and second lasers marking alternate following objects as they pass through the marking station.. .
Ten Media, Llc
Multi-wavelength distributed raman amplification set-up
Techniques are presented herein to set power levels for multiple raman pump wavelengths in a distributed raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of raman pump lasers at different wavelengths at the second node turned off.
Cisco Technology, Inc.
Laser projection system
A device for projecting images from a video generating device such as a computer, television receiver, or similar device onto a screen or other surface is described in this invention. The device uses a rotating disk containing numerous lenses to direct a light beam from a laser or other light source towards the screen.
Gastric reflux treatment with lasers
Method/devices for endoscopic laser treatment of gastrointestinal disorders such as, gastro-esophageal reflux disorder (gerd) are disclosed. Treatment involves irradiating tissue of the digestive tract to strengthen muscle tone and shrink anatomical areas reducing occurrence of reflux of food/liquids from the stomach to the esophagus.
Tunable laser, a making, and a operating such a laser
Semiconductor lasers, in particular quantum cascade lasers (qcls) are tuable especially in the mid-ir spectral range, e.g. In wavelengths of about 3-14 μm, by precisely controlling the laser's temperature in the vicinity of the active region.
Alpes Lasers Sa
Red, green, and blue lasing enabled by single-exciton gain in colloidal quantum dot films
The methods and materials described herein contemplate the use films of colloidal quantum dots as a gain medium in a vertical-cavity surface-emitting laser. The present disclosure demonstrates a laser with single-exciton gain in the red, green, and blue wavelengths.
Wavelength division multiplexing with multi-core fiber
Optical systems for wavelength division multiplexing and wavelength division demultiplexing with a multi-core fiber, and methods of their fabrication, are disclosed. The systems include a coupling mirror with a plurality of angled surfaces that are configured to direct light to or from different cores of a multi-core fiber.
International Business Machines Corporation
Obtaining narrow line-width, full c-band tunability mirror for monolithic or hybrid integrated lasers
An apparatus comprising an optical medium, a power splitter coupled to the optical medium, a first delay line coupled to the power splitter such that the power splitter is positioned between the first delay line and the optical medium, a first comb reflector coupled to the first delay line such that the first delay line is positioned between the first comb reflector and the power splitter, and a second comb reflector coupled to the power splitter but not the first comb reflector and not the first delay line. A method comprising receiving an optical signal, splitting the optical signal into a first split optical signal and a second split optical signal, delaying the first split optical signal, tuning the delayed first split optical signal, tuning the second split optical signal, and delaying the tuned second split optical signal..
Futurewei Technologies, Inc.
Phosphor ceramics and methods of making the same
Preparation of a porous ceramic composite with a fluoride phosphor is described herein. The phosphor ceramics prepared may be incorporated into devices such as light-emitting devices, lasers, or for other purposes..
Nitto Denko Corporation
Vertical cavity surface emitting laser
A vertical cavity surface emitting laser includes a base substrate formed by a semi-insulating semiconductor, a light-emitting region multilayer portion including an n-type semiconductor contact layer, an n-type semiconductor multilayer-film reflecting layer, an n-type semiconductor clad layer, an active layer provided with a quantum well, a p-type semiconductor clad layer, a p-type semiconductor multilayer-film reflecting layer, and a p-type semiconductor contact layer, which are formed on the surface of the base substrate sequentially, an anode electrode formed on the surface of the p-type semiconductor contact layer, and a cathode electrode that is connected to the n-type semiconductor clad layer. The cathode electrode is formed on the base substrate at the side of the light-emitting region multilayer portion.
Murata Manufacturing Co., Ltd.
Generation of vuv, euv, and x-ray light using vuv-uv-vis lasers
A method for extending and enhancing bright coherent high-order harmonic generation into the vuv-euv-x-ray regions of the spectrum involves a way of accomplishing phase matching or effective phase matching of extreme upconversion of laser light at high conversion efficiency, approaching 10−3 in some spectral regions, and at significantly higher photon energies in a waveguide geometry, in a self-guiding geometry, a gas cell, or a loosely focusing geometry, containing nonlinear medium. The extension and enhancement of the coherent vuv, euv, x-ray emission to high photon energies relies on using vuv-uv-vis lasers of shorter wavelength.
Pump absorption and efficiency for fiber lasers/amplifiers
Techniques are disclosed for improving pump absorption and efficiency for fiber lasers and amplifiers, for instance. In some embodiments, the techniques are implemented by applying a partially reflective coating on a fiber end-face to double-pass any unabsorbed or otherwise excess pump light in the cladding of a fiber.
Bae Systems Information And Electronic Systems Integration Inc.
Lidar sensor system
A lidar sensor system includes: a transmitting unit including one or more emitting units so as to transmit polarization lasers to an object; a receiving unit configured to receive reflection light reflected on the object; and a processing unit configured to sense the object from the reflection light, and the transmitting unit may include a first emitting unit emitting a first laser and a second emitting unit emitting a second laser having polarization light orthogonal to the first laser.. .
Hyundai Mobis Co., Ltd.
Backlight module and liquid crystal display device using same
A backlight module includes a number of laser units, a number of diffraction units, and a number of diverging units. Each laser unit includes three colored lasers arranged in a first straight line.
Hon Hai Precision Industry Co., Ltd.
Iii-v photonic integration on silicon
Photonic integrated circuits on silicon are disclosed. By bonding a wafer of hi-v material as an active region to silicon and removing the substrate, the lasers, amplifiers, modulators, and other devices can be processed using standard photolithographic techniques on the silicon substrate.
The Regents Of The University Of California
Method and high speed surface blackening and coloring with ultrafast fiber lasers
Methods and systems for high speed surface blackening and/or coloring are disclosed, including generating electromagnetic radiation from an ultrashort pulse laser (upl); coupling the electromagnetic radiation from the upl to a scanner comprising a scanning and focus range, wherein the scanner is configured to receive the electromagnetic radiation from the upl and to scan and focus the electromagnetic radiation onto a sample; using a computer to adjust the pulse repetition rate and the energy of the upl; using a five degree of freedom motorized stage to position the sample; using a dichroic filter positioned between the scanner and the sample; focusing an imager through the dichroic filter and onto the surface of the sample; using a processor to acquire and process images to monitor the surface blackening and/or coloring of the sample within the scanning and focus range of the electromagnetic radiation. Other embodiments are described and claimed..
Systems and methods extending the laserspray ionization mass spectrometry concept from atmospheric pressure to vacuum
Disclosed herein are systems and methods that allow analysis of macromolecular structures using laserspray ionization at intermediate pressure or high vacuum using commercially available mass spectrometers with or without modification and with the application of heat. The systems and methods produce multiply-charged ions for improved analysis in mass spectrometry..
Wayne State University
Cross line laser
A cross line laser (100) comprises a shell and a hanging system (101). The hanging system has two laser modules (110) arranged oppositely on a same plane.
Changzhou Huada Kejie Opto-electro Instrument Co., Ltd.
Operating vertical-cavity surface-emitting lasers
Methods, systems, and computer-readable media are provided for operating a vertical cavity surface-emitting laser. Operating a vertical-cavity surface-emitting laser can include receiving an optical signal from a transmitter, converting the optical signal to a waveform, generating a read capture window based on the waveform, sampling data at a first position in the read capture window, sampling data at a second position in the read capture window, and sending a signal to the transmitter to increase a power level of the optical signal in response to a difference between the sampled data at the first position and the sampled data at the second position exceeding a threshold..
High smsr unidirectional etched lasers and low back-reflection photonic device
Unidirectionality of lasers is enhanced by forming one or more etched gaps in the laser cavity. The gaps may be provided in any segment of a laser, such as any leg of a ring laser, or in one leg of a v-shaped laser.
Methods of producing optoelectronic semiconductor components, and optoelectronic semiconductor lasers
An optoelectronic semiconductor laser includes a growth substrate; a semiconductor layer sequence that generates laser radiation; a front facet at the growth substrate and at the semiconductor layer sequence, wherein the front facet constitutes a main light exit side for the laser radiation generated in the semiconductor laser and has a light exit region at the semiconductor layer sequence; a light blocking layer for the laser radiation, which partly covers at least the growth substrate at the front facet such that the light exit region is not covered by the light blocking layer; and a bonding pad at a side of the semiconductor layer sequence facing away from the growth substrate, wherein a distance between the bonding pad and the light blocking layer at least at the light exit region is 0.1 μm to 100 μm.. .
Osram Opto Semiconductors Gmbh
Alkali resistant optical coatings for alkali lasers and methods of production thereof
In one embodiment, a method for forming an alkali resistant coating includes forming a first oxide material above a substrate and forming a second oxide material above the first oxide material to form a multilayer dielectric coating, wherein the second oxide material is on a side of the multilayer dielectric coating for contacting an alkali. In another embodiment, a method for forming an alkali resistant coating includes forming two or more alternating layers of high and low refractive index oxide materials above a substrate, wherein an innermost layer of the two or more alternating layers is on an alkali-contacting side of the alkali resistant coating, and wherein the innermost layer of the two or more alternating layers comprises at least one of: alumina, zirconia, and hafnia..
Lawrence Livermore National Security, Llc
Submarine reconfigurable optical add/drop multiplexer with passive branching unit
Systems and methods for data transport, including submarine reconfigurable optical add/drop multiplexers, branching units configured to receive signals from trunk terminals (tts), and dummy light filters configured to pass useful signals through the filters, and to reflect dummy light. Optical interleavers are configured to separate useful signals into two or more groups of optical channels, and the optical channels are set to a frequency of either a left or a right portion of a total channel bandwidth.
Nec Laboratories America, Inc.
Photonic crystal surface-emitting lasers
A photonic-crystal surface-emitting laser (pcsel) includes a gain medium electromagnetically coupled to a photonic crystal whose energy band structure exhibits a dirac cone of linear dispersion at the center of the photonic crystal's brillouin zone. This dirac cone's vertex is called a dirac point; because it is at the brillouin zone center, it is called an accidental dirac point.
Dielectric-enhanced metal coatings for mems tunable filters
The present invention concerns the use of hybrid metal-dielectric optical coatings as the end reflectors of laser cavities and/or in the mirror structures used in other optical resonators, such as fabry-perot tunable filters, along with the use of such fabry-perot tunable filters in wavelength swept sources such as lasers. Hybrid metal-dielectric optical coatings have reflectivity spectra that can be broader than pure dielectric coatings, offer optical reflectivities higher than metal, as high as pure dielectric coatings, eliminate mirror transmission that can cause parasitic light reflections, and use fewer layers and thus have lower mass and higher mechanical resonant frequency for movable mirror applications an important characteristic of these coatings concerns the non-reflected light.
Axsun Technologies, Inc.