100 results about "Disk laser" patented technology

For increasing the power emitted by surface emitting lasers and for improving the spatial coherence of the laser beam, emitted in particular by disk lasers, microchip lasers and VCSELs having a relatively wide emitting area, the invention proposes to select a low order transverse cavity mode by means of a mirror structure (12) of high reflectivity, and of high angular selectivity. The mirror structure comprises a multilayer (14) receiving the optical beam (24) and a resonant grating mirror (16) following the multilayer and arranged for highly reflecting the optical beam in a narrow angular range at each side of a determined incidence angle.

A solid state laser module for amplification of laser radiation. The module includes a laser gain medium having a pair of generally parallel surfaces that form a disc-like shape, that receive and transmit laser radiation. At least one perimetral optical medium is disposed adjacent a peripheral edge of the laser gain medium and in optical communication therewith. A source of optical pump radiation directs optical pump radiation into the perimetral optical medium generally normal to the parallel surfaces and the perimetral optical medium transports the optical pump radiation into the laser gain medium to pump the laser gain medium to a laser transition level. Alternative embodiments include arrangements for directing cooling fluids between adjacently disposed laser gain media.

An optical system includes a diode pump source and a thin disk gain media. The thin disk gain media has first and second surfaces and is made of a material with an anisotropic thermal expansion. At least one of the first and second surfaces is a cooling surface. The thin disk gain media is cut at an angle to provide substantially the same thermal expansion coefficient in all directions lying in a plane that is parallel to the cooling surface. An optical coupler is positioned between the diode pump source and the thin disk gain media to direct an output from the diode pump source to the thin disk gain media.

For increasing the power emitted by surface emitting lasers and for improving the spatial coherence of the laser beam, emitted in particular by disk lasers, microchip lasers and VCSELs having a relatively wide emitting area, the invention proposes to select a low order transverse cavity mode by means of a mirror structure (12) of high reflectivity, and of high angular selectivity. The mirror structure comprises a multilayer (14) receiving the optical beam (24) and a resonant grating mirror (16) following the multilayer and arranged for highly reflecting the optical beam in a narrow angular range at each side of a determined incidence angle.

The invention discloses a video disc fixing laser. A video disc laser crystal and a laser cavity resonator output lens form a laser cavity resonator; the focus of one of two paraboloid reflectors positioned in a conjugating way is positioned in the video disc laser crystal; a pump light sent by a semiconductor laser stack array is firstly collimated by a pump light collimator, then is imaged on the video disc laser crystal through the two paraboloid reflectors and is output as laser formed through the laser cavity resonator at last. The invention adopts the method of semiconductor stack array and has high efficiency, long service life and convenient equipment maintenance. A double-paraboloid pump system positioned in the conjugating way reduces the requirement for the collimation degree of the pump light and realizes high-efficiency imaging of the pump light. Each secondary pump luminous spot has regular and symmetrical shape, reasonable power density distribution and small position excursion of the light luminous spots for each imaging, and high-efficiency and even pumping is realized. The equipment has smaller volume, simple mechanical structure and adjustment and lighter weight, and is convenient for industrial application.

A rotary disk module, having a rotary disk is interposed between a pair of heat sinks each spaced from the rotary disk by a gap. A motor is installed for driving the rotary disk to rotate. The gaps are filled with cooling medium such as helium, water or liquid nitrogen to remove the heat generated in the rotary disk by conduction, convection or evaporation. The rotary disk may be fabricated from various materials depending on the intended applications of the module, and the heat sink surfaces are preferably fabricated from materials with higher thermal conductivity. The rotation of the rotary disk allows the regions on which an optical pump radiation is delivered to be separated from the regions from which an optical radiation is extracted. In addition to improved heat dissipation effect, the rotation of the optical disk allows multiple directions of pump energy or multiple sources of pump energies and / or multiple beams of optical radiation to be applied and extracted simultaneously.

A solid state laser module for amplification of laser radiation. The module includes a laser gain medium having a pair of generally parallel surfaces that form a disc-like shape, that receive and transmit laser radiation. At least one perimetral optical medium is disposed adjacent a peripheral edge of the laser gain medium and in optical communication therewith. A source of optical pump radiation directs optical pump radiation into the perimetral optical medium generally normal to the parallel surfaces and the perimetral optical medium transports the optical pump radiation into the laser gain medium to pump the laser gain medium to a laser transition level. Alternative embodiments include arrangements for directing cooling fluids between adjacently disposed laser gain media.

The invention discloses a system and a method for processing dynamic focusing scanning spot track of optical fiber laser or disk laser. Aiming at the defects in scanning technology of the current laser scanning welding system, an optical fiber laser or a disk laser, a PSD displacement sensor, and a dynamic focusing fast scanning head driven by a high-accuracy hollow-shaft linear motor are adopted for implementing loop closing and real-time control of a dynamic focusing module, in order to perform spot scanning processing of fast spot track on workpiece. The system and the method have the advantages of large processing scope, high quality, fast welding or spotting speed and high efficiency, in addition, accuracy and welding quality of the system are enhanced effectively, 3D welding can be realized, and extensive application value in the field of advanced manufacture is achieved.

The invention discloses a planar laser induced fluorescence imaging measurement method for simultaneously measuring various constituent messages, relating to the fields of energy source power and optoelectronics and solving the defects that the conventional method only can measure one constituent, but can not completely reflect flow field and combustion process. The method comprises the steps of: carrying out beam combination on the lasers generated by n laser devices to form a beam of laser, then carrying out beam shaping through a sheet beam shaping system, exciting a constituent message in an appointed target area in a target flame by a shaped sheet laser, and generating n different wavelengths of fluorescent lights; orderly separating n different wavelengths of fluorescent lights from a space through a focusing lens and a grating, respectively imaging in n different areas of an area array ICCD (intensified charge coupled device) receiving surface, transmitting n received images to a computer to process and analyze and simultaneously obtaining space distribution messages of n constituents. The method disclosed by the invention can be widely applied to diagnosis of various flow fields and combustion processes so as to provide basic data for researches of combustion science, fluid mechanics and combustion technology.

The invention relates to a method for inhibiting the amplified spontaneous emission of large-size sheet laser neodymium glass, which comprises the following steps of: (1) selecting absorbing glass matched with the sheet laser neodymium glass and an organic adhesive; (2) processing and adhering the sheet laser neodymium glass and an absorbing glass strip; (3) precisely polishing a light pass surface of the sheet laser neodymium glass, and the like. The method can effectively inhibit the amplified spontaneous emission and parasitic oscillation of the large-size sheet laser neodymium glass; gain performance approximates the theoretical calculation level; and the glass has high stability and meets the using requirement of a high-power laser device.

Methods, systems and apparatus are provided for amplifying a source light in a solid state laser. An amplifier module for the solid state laser suitably includes a disk having two substantially parallel surfaces and an optical gain material. A number of diode bars are arranged about the perimeter of the disk and configured to provide optical pump radiation to the laser gain material in the disk. Each of the plurality of diode bars is spatially aligned with the disk in such a manner as to produce substantially uniform gain across the optical gain material. The fast axes of the diode bars maybe aligned to be parallel or orthogonal to the parallel surfaces of the disk, for example.

The invention relates to a temperature control method of laser medium of a disk laser and a device thereof. The method comprises the steps that temperature control is performed on laser medium in different regions through a semiconductor refrigerating chip array; firstly reference temperature is set, laser medium subregions, the temperature of which is higher than the reference temperature, are refrigerated, and laser medium subregions, the temperature of which is lower than the reference temperature, are heated; the device comprises the laser medium, a heat sink connected with the laser medium, heat-conducting glue, a temperature sensor on the heat-conducting glue, the semiconductor refrigerating chip array, a closed-loop circuit control system and a computer system; the temperature sensor detects the practical temperature of the laser medium subregions in real time, sends the practical temperature to the computer system, and sends temperature control signals after the practical temperature is compared to the reference temperature; and a closed-loop circuit feeds back the temperature control signals to semiconductor refrigerating chips in real time, so as to realize the real-time control to the laser medium subregions, and to realize the bulk temperature control to the laser medium. The method can dynamically control the temperature of the laser medium to be evenly distributed, and effectively restrain the problem of the thermal effect of the laser medium.

The invention discloses a laser multi-pass amplifier based on tandem connection of two discs. The laser multi-pass amplifier based on tandem connection of the two discs comprises a first parabolic reflector, a second parabolic reflector, a third parabolic reflector, a fourth parabolic reflector, a first disc laser crystal and a second disk laser crystal, wherein the first parabolic reflector, the second parabolic reflector, the third parabolic reflector and the fourth parabolic reflector are arranged coaxially in sequence, the first parabolic reflector and the second parabolic reflector are arranged in a conjugated mode, and the third parabolic reflector and the fourth parabolic reflector are arranged in a conjugated mode; the surface of the first parabolic reflector is provided with a pumping light incident hole and a seed laser incident hole, and the center of the first parabolic reflector is hollowed out for containing the first disc laser crystal; the center of the fourth parabolic reflector is hollowed out for containing the second disc laser crystal; the center of the second parabolic reflector and the center of the third parabolic reflector are hollowed out. Through the laser multi-pass amplifier based on tandem connection of the two discs, the optical length of the disc laser crystals can be extended, the spontaneous radiation effect of laser is restrained, the power of output laser is increased, and the equivalent thickness of the disc laser crystals is increased; consequently, the pumping frequency of the disc laser crystals is increased, the absorption efficiency of the pumping light is improved, and the power of the output laser is further improved.

A large number of passes of pump light through an active mirror in a solid state disk laser is realized using a pair of coupled imaging systems, where the optical axes of imaging systems are not coincident. Two imaging systems are optically coupled, so that an image of the first imaging system is an object of the second imaging system, and vice versa. An active mirror is disposed at the object or image plane, or at the focal plane of any one of the coupled imaging systems, where the position of the reflected pump beam during the multi-reflection between the first and second imaging systems is substantially unchanged.

The invention relates to a high-power intracavity frequency-doubled semiconductor disk laser, which belongs to the technical field of semiconductor lasers. According to the invention, the heating effect of the laser is improved by using a heat-dissipating window, the frequency of fundamental-frequency lasers is stabilized and the line width of fundamental-frequency lasers is narrowed by using a filtering device, thereby improving the intracavity frequency-doubled efficiency. A pumping light subjected to collimating and focusing acts on a semiconductor disk gain medium (4), and a high-heat-conductivity heat-dissipating window (5) which is transparent to the pumping light and laser is bonded on the semiconductor disk gain medium; a photon-generated carrier in the gain medium has stimulated radiation in a quantum well (14), a laser cavity consisting of a rear-end mirror (8), an output coupling mirror (7), and a Bragg mirror (16) at the bottom of the semiconductor disk gain medium generates fundamental-frequency lasers, and a nonlinear crystal (10) generates frequency-doubled lasers (11); and the semiconductor disk laser is characterized in that: a filtering device (9) is arranged in the laser cavity, so that the frequency of fundamental-frequency lasers is stabilized effectively, and the line width of the fundamental-frequency lasers is narrowed many times, thereby improving the frequency-doubled efficiency.

A solid-state gain element including a thin doped region in which an optical signal propagates through the thin doped region at a large angle with respect to the normal to the thin doped region, reflects at a boundary of the thin doped region, and passes through the thin doped region again. An optical pump beam propagates through the thin doped region also at a large angle with respect to the normal to the thin doped region. In one example, the gain element and source of the pump beam are configured such that there is total internal reflection of the pump beam at the boundary of the thin doped region for a second pumping pass through the thin doped region. In another example, an elliptically symmetric laser beam is used to create a circularly symmetric gain region in the thin doped region.

A fuel jet flow concentration field distribution testing device belonging to the technical field of concentration field testing and an implementing method thereof are disclosed. The device comprises a laser, a frequency doubler, total reflection prisms, a disk laser generating lens group, a constant volume bomb system, a plane mirror, a filter mirror and a fluorescence signal detector. The device generates collimating laser signals by adopting the laser, collimating laser signals of a corresponding wavelength are obtained through the frequency doubler, the light path is changed through the first and second total reflection prisms so as to allow entrance into the disk laser generating lens group, collimating light is converted into disk light through the disk laser generating lens group, the disk light is emitted into a constant volume bomb to induce tracer particles to generate fluorescence, the fluorescence is captured through the fluorescence signal detector to generate a two-dimension fluorescence image after the light path of the fluorescence is changed through the plane mirror and the fluorescence is then filtered through the filter mirror, the generated image is divided into n grids, and the quantitative fuel mist concentration distribution is obtained by numerical calculation through a correlation between calibrated concentrations and light intensity. Test conditions of the device and the method are close to those of practical internal combustion engines. The device and the method have guiding significance for future internal combustion engine development.

The invention relates to the technical field of part surface treatment devices, particularly to a disk type laser cleaning machine for small parts. The laser cleaning machine specifically comprises a disk rotating mechanism and a operating station. The disk rotating mechanism comprises a main transmission shaft, a driving motor and a disk fixing plate which are arranged on the top of the machine, and the disk fixing plate is provided with a disk, and connected to the main transmission shaft; and the operating station is arranged on the disk, and comprises a manual feeding and blanking station, a laser cleaning station, a cleaning and water-blowing station and a drying station which are evenly distributed on the disk fixing plate symmetrically. Different batches of workpieces arranged on the disk are rotated to each station in turn along with the disk fixing plate under the driving of the driving motor, so that the workpieces are cleaned. According to the laser cleaning machine provided by the invention, laser cleaning is fit to a manipulator, and chemical agents are not used; the laser cleaning machine has the advantages of high cleaning efficiency, and no damage to the surfaces of the workpieces or secondary pollution; and a plurality of batches of parts can be cleaned simultaneously in a disk type cleaning manner, and the cleaning efficiency is improved greatly.

A laser system for producing a laser beam, the laser system having top and bottom heat-sinking bars forming the structure of the laser system and plurality of disks comprising a laser material mounted on both the bottom heat-sinking bar and the top heat-sinking bar. Also mounted on both heat-sinking bars is a plurality of pump diode bars. Each pump diode bar is preferably mounted opposite a corresponding laser disk on the opposite heat-sinking bar. The pump diode bars and the disks are symmetrically mounted on the top and bottom heat-sinking bars, so that each heat-sinking bar has an alternating pattern of pump diode bars and laser disks. The laser system is configured such that the lasing beams impinge on the disks with an incidence angle far off normal.

A rotary disk module, having a rotary disk is interposed between a pair of heat sinks each spaced from the rotary disk by a gap. A motor is installed for driving the rotary disk to rotate. The gaps are filled with cooling medium such as helium, water or liquid nitrogen to remove the heat generated in the rotary disk by conduction, convection or evaporation. The rotary disk may be fabricated from various materials depending on the intended applications of the module, and the heat sink surfaces are preferably fabricated from materials with higher thermal conductivity. The rotation of the rotary disk allows the regions on which an optical pump radiation is delivered to be separated from the regions from which an optical radiation is extracted. In addition to improved heat dissipation effect, the rotation of the optical disk allows multiple directions of pump energy or multiple sources of pump energies and / or multiple beams of optical radiation to be applied and extracted simultaneously.

The invention discloses a neophane glass piece laser in heat capacity type. The invention is characterized in that the invention comprises a resonant cavity and an octagonal silvering reflector. The resonant cavity is a virtual confocal cavity which comprises a total reflective mirror and an output mirror; the octagonal silvering reflector is internally provided with a plurality of laser glass pieces which form 45 DEG with an optical axis; the optical axis of the laser glass piece is coincident with the optical axis of the resonant cavity; the upper side and the lower side of the laser glass pieces are respectively provided with pumping lights which are arranged in the reflector; the discharging direction of the pumping light is parallel to the direction of the laser; the pumping light is coaxially and hermetically sleeved with a cerium-doped quartz pipe; cooling water is arranged between the quartz pipe and the pumping light; the invention has the advantages of simple structure, obtaining the laser output with high energy and high power by operation under high repeated frequencies in short time, uniform and stable laser output, recovering the glass working medium to original state in the operation interval of the device and avoiding the thermal lens effect and the thermal stress effect to the laser device.

Helper resonators useful for the reliable, controlled startup of an associated high power multidisk unstable imaging thin disk laser (TDL) main resonator each includes one of the thin disk gain elements (TDGEs) of the associated main resonator and a pair of helper reflectors disposed on opposite sides thereof. The helper resonators act to prevent the buildup of undesirable amplified spontaneous emission (ASE) during startup of the main resonator, pre-condition the TDGEs so as to enable efficient power transfer from the helper resonators to the main resonator when the main resonator reaches a selected feedback ratio (FBR) and provide a rapidly acting shunt for disk power in the event of a cessation of lasing of the main resonator.

A laser system may include a first portion of laser host material adapted for amplification of laser radiation and a second portion of laser host material surrounding the first portion which may be adapted for suppression of ASE. The first portion of laser host material and the second portion of laser host material may be respectively doped at a different predetermined concentration of laser ions. A heat exchanger may be provided to dissipate heat from the first portion and the second portion.

Provided herein is an apparatus for optically isolating a light beam from a laser, comprising an optical isolator configured to isolate a light beam having a beam quality; a reference plane; an output connector disposed at the output of the optical isolator, wherein the output connector is configured with a common collimator interface to connect to a collimator which is capable of being mechanically referenced to the reference plane; a first lens arrangement disposed proximal to a distal end of the output connector, wherein the first lens arrangement is selected to provide an output light beam having a predetermined divergence. The laser can be selected from the group consisting of a fiber laser, a disk laser and a rod laser. Also provided herein are a system, a plurality of lasers, and a method of providing a light beam that has a consistent divergence and distance from a reference plane.

A chip-shaped laser medium (12) is side pumped to improve mode matching between the pumping energy (50) and lasing mode volume (36). The chip thickness (44) and laser medium doping level can be designed and controlled to ensure adequate pumping coupling efficiency. The chip shape can also be employed to provide greater chip surface areas (22) for cooling the laser medium (12). The laser pumping package (70), gain module (101), and chip-shaped design can be scalable to offer higher pumping power and high output power. Different orientations of the gain modules (101) with respect to each other can be used to provide better lasing mode quality.

An optical system has a high power diode pump source and a thin disk gain media. An optical coupler is positioned between the diode pump source and the thin disk gain media. The optical coupler produces a beam with a large numerical aperture incident on the thin disk gain media.

The invention discloses a quantitative measurement apparatus for the volume fraction of soot produced by combustion in an optical engine cylinder. According to the invention, a standard light source with known radiation intensity is used for calibrating radiation intensity of an ICCD camera equipped with a double-imaging device so as to obtain the sensitive coefficient of the ICCD camera to radiation intensity of an illuminant; a Nd: YAG laser generates high-energy laser which forms disk laser after being shaped by a battery of lenses, the disk laser enters a combustion chamber of an optical engine, and soot is heated by the disk laser and forms an incandescent light signal; and the incandescent light signal passes through a quartz window at the top of a piston, is reflected by a reflective mirror and is then collected by the ICCD camera, an image acquisition system acquires the image data of the incandescent light signal at two wavelengths, and image processing is carried out so as to obtain two-dimensional quantitative results of the volume fraction of the soot whose tangent plane is penetrated by the disk laser. The measurement apparatus provided by the invention employs the double-imaging device to realize multi-point on-line calibration and quantitative measurement of the volume fraction of soot, has a simple structure, and omits a sensor and a data acquisition device used in a traditional single-point calibration system, thereby reducing cost.

The amplifier has two disk laser crystals (2, 3) in a laser radiation field, where each of the crystals defines a plane that is penetrated by the field. A focusing optical component is disposed in the field between the two crystals. The component has a spherical concave mirror (17) disposed in the field approximately at a distance corresponding to half of curvature radius of the mirror from planes of the crystals. An independent claim is also included for a method of forming a laser amplifier.

The invention discloses a low-resistance lithium-ion battery cap, which includes a sealing ring. A top cover, an explosion-proof sheet and a hole plate are respectively packaged in the sealing ring from top to bottom. Laser welding point connection, the orifice plate is welded to the bottom of the explosion-proof plate, and an insulating sheath is arranged between the two, and the explosion-proof plate has a wrapping extending inwardly above the top cover, and the wrapping and the top cover The cover is tightly fitted, and there is a circle of dents on the inner side of the explosion-proof disc and the top cover, and a support step extends inward from the bottom of the sealing ring, and the orifice plate falls off the support step In addition, the above-mentioned low-resistance lithium-ion battery cap not only greatly reduces the internal resistance of the battery cap, but also has a simple structure, saves costs, and has high safety and reliability.

The invention discloses a holographic real-time measuring method for measuring the particle size of a moving particle. The method comprises the steps of: a disk laser beam expanding system generatingdisk laser to irradiate to the moving particle; the disk laser passing through the scattered light of the particle to form object light; taking the sheet laser which did not pass through the particleas reference light; the object light interfering with the reference light to form a one-dimensional holographic stripe, and recording the one-dimensional holographic stripe; reconstructing a hologramformed by the recorded one-dimensional holographic stripe to obtain a particle image; and calculating the particle size according to the number and the size of the pixels in the particle image. The invention further discloses a holographic real-time measuring device for measuring the particle size of the moving particle. The holographic real-time measuring device comprises disk laser beam expanding system, a linear array camera, and a holographic data processing unit, wherein the disk laser beam expanding system comprises a laser light source and a cylindrical lens. According to the holographic real-time measuring method and the device for measuring the particle size of the moving particle, real-time and rapid monitoring of the particle size of the particle can be realized by reducing collection and reconstruction data dimensions and reducing data volume.