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.

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.

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 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 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.

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 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.

A solid-state laser resonator with at least two laser-active media in a common laser radiation field (4), wherein the laser-active media do not constitute a hard aperture of the laser radiation field (4), in the solid-state laser resonator, during the laser radiation In the field (4), at least one focusing optical element (17, 18) is arranged between two adjacent laser active media such that its focal length and its relation to the surfaces of the two adjacent laser active media (2, 3) ( 9, 10), so that the surfaces of the laser active medium (2, 3) are approximately optically conjugated to each other.

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.