16 results about "Disk laser" patented technology

The invention discloses a suspended polygonal GaN micro-disk laser and a preparation method thereof, and belongs to the field of semiconductor lasers. The laser comprises a polygonal resonant cavity and output waveguides which are manufactured on a substrate, wherein each vertex angle or two non-adjacent vertex angles of the polygonal resonant cavity are respectively connected with the output waveguides; the polygonal resonant cavity can be a regular quadrilateral, regular hexagonal or regular octagonal resonant cavity; the preparation method comprises the following steps: growing a SiO2 mask layer on an epitaxial layer of a substrate; defining a required micro-disk graph; transferring the pattern to the SiO2 mask layer; etching the epitaxial layer until the substrate is exposed; corroding the substrate until the substrate at the bottom of the polygonal resonant cavity is completely corroded; the micro-disk laser provided by the invention is simple in structure, mature and reliable in preparation process and suitable for the field of optical communication and photoelectric integration.

The application discloses a multi-pass disk laser amplifier, which comprises a near end and a far end, a pump laser beam, a seed laser beam, a first parabolic mirror, a second parabolic mirror, a laser gain medium, a first deflection optical prism group and a second deflection optical prism group, wherein the laser gain medium comprises a medium reflection surface; the pump laser beam located at the near end is aligned to the first parabolic mirror located at the far end for incidence through a first beam collimator; and the seed laser beam located at the near end is aligned to the second parabolic mirror located at the far end for incidence after passing through a second beam collimator. Compared with a conventional multi-pass disk laser amplifier, the application has a simpler structure, a shorter amplification optical path, a more compact volume and higher system stability. Furthermore, by changing the structure of the design prism of the pump light path, 12-pass, 24-pass, 36-pass, 48-pass and other multi-pass amplifications can be realized.

1. The name of the design product: continuous disc laser. 2. The use of the design product: a mechanical structure as part of a laser emitter to deflect and shape the laser to produce a specific specification of light spot. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: assembly 8 perspective view. 5. Other components that need to be explained: component 1 laser steering module: used to deflect the transmission direction of the laser; component 2 optical shutter: through the mirror set in it, the transmission direction of the laser can be controlled; component 3 wedge angle mirror beam deflection module: deflects the incident laser to the ring core optical fiber, and outputs a ring light spot; component 4 optical fiber coupling module: couples the spatial light into the optical fiber; component 5 absorber: by expanding the laser beam, the laser is uniformly distributed on the mechanical black body surface; component 6 diaphragm 1: a mechanical part with a through hole, used to absorb stray light and non-Gaussian part of the laser, and shape the laser; component 7 diaphragm 2: a mechanical part with a through hole, used to absorb stray light and non-Gaussian part of the laser, and shape the laser; component 8 resonant cavity light source: disc laser resonant cavity main body, mainly used for emitting laser.

The invention discloses a novel micro-channel type cooling structure device for a disc laser. The novel micro-channel type cooling structure device comprises a sealing cover, a heat sink, a crystal, a supporting ring and a vortex-shaped channel. The sealing cover and the shell are made of copper-tungsten alloy vortex-shaped flow channels, the main body material of the vortex-shaped flow channels is diamond, and the vortex-shaped flow channels are realized through an etching process, and the vortex-shaped flow channels have the structural advantages that water inlets are formed in the periphery and water outlets are formed in the center, so that the influence on the crystal surface shape caused by overlarge stress generated on the back surface of a heat sink during collision of a traditional jet flow structure is avoided; the light beam quality is reduced; meanwhile, the four vortex flow channels are combined with local impact, so that the fluid generates strong secondary flow and boundary layer disturbance, the convective heat transfer coefficient is increased, a circular heat source of a light spot with the diameter of 17 mm is well adapted, and compared with a traditional micro-flow-channel structure, the temperature uniformity is greatly improved. The invention has the advantage that the problems of stress deformation and non-uniform heat dissipation existing in large-area sheet crystal heat exchange are solved through a unique bionic flow channel structure.

The invention discloses a GaN bridging micro-disk laser capable of directionally emitting laser and a preparation method thereof, and belongs to the technical field of semiconductor photoelectric devices. A bridging polygonal microcavity structure is provided, extending bridge structures are introduced at vertex angles of a quadrilateral microcavity and a circular microcavity, mirror symmetry of polygons is broken through geometric coupling of bridges and a main cavity, and an echo wall mode is directionally coupled to an output waveguide. The bridging structure can be achieved through conventional photoetching and dry etching, complex deformation etching is not needed, and the technology is compatible with an existing CMOS production line. The side wall damage is repaired through wet etching, the light field scattering loss is reduced, the mode stability is improved, and a robust solution is provided for high-density integration.

This application belongs to the field of laser amplification technology and provides a beam-actively controlled disk laser amplifier, comprising: a disk crystal for laser amplification; a seed light source for providing a polarized seed laser to be amplified, the seed laser having a first diameter spot at the disk crystal, and the size of the first diameter spot being dynamically adjustable; a pumping device for pumping the disk crystal, the pump light emitted by the pumping device having a second diameter spot at the disk crystal; and a spot adjustment component for dynamically adjusting the size of the first diameter spot, so that the ratio of the first diameter spot to the second diameter spot is within a preset range. This application uses a spot analysis device to monitor the diameter of the output seed amplified laser spot and uses a surface shape adjustment mirror to calibrate the spot diameter of the seed light in real time, thereby achieving a stable output spot diameter from low to high pump power and under power fluctuations, thus ensuring the stability of the output laser power and beam quality.

The challenge lies in how to distinguish and detect each group of microparticles when multiple groups of microparticles are present. [Solution] The microparticle swarm detection device 10 irradiates a predetermined area including the workpiece 60 with green sheet laser light and red sheet laser light, switching the emission timing of these lights in a time series, and uses the imaging unit 15 to capture a video of the predetermined area including the workpiece 60. Then, frames captured with green sheet laser light and frames captured with red sheet laser light are extracted from the captured video to generate a video of green frames and a video of red frames. Subsequently, the microparticle swarm detection device 10 detects microparticle swarms based on the extracted video of green frames. The microparticle swarm detection device 10 also detects microparticle swarms based on the extracted video of red frames.

This invention discloses a glass bubble detection system and method based on orthogonal laser scattering, which relates to the field of industrial machine vision technology. It includes: a conveying device for carrying the glass to be tested and moving it along... Z Uniformly moving along the axial direction; a line laser emitting unit, used to generate a laser perpendicular to the upper surface of the glass under test and perpendicular to the axis. Z shaft and X The invention comprises a planar sheet-like laser light curtain formed by an axis; a side-viewing imaging unit for acquiring images of the laser scattering spot as the glass under test passes through the sheet-like laser light curtain; and a central processing unit for controlling the synchronous triggering of the transmission device and the side-viewing imaging unit, and processing the laser scattering spot images to identify bubble defects inside the glass under test. This invention solves the problem of traditional transmission methods being unable to obtain depth information, significantly improving the positioning accuracy of microbubbles and the accuracy of defect classification.

This invention relates to a multi-pass optical path system and its adjustment method for an off-axis dual-reflector disk laser, overcoming a series of problems associated with existing multi-pump schemes for disk lasers, such as high processing requirements, difficult system assembly and adjustment, and complex structure and difficult optical adjustment of the signal light amplification system. This invention employs a combination of a series of small-aperture spherical or aspherical mirrors and total reflection mirrors, utilizing a discrete adjustment method to uniformly distribute the pump spot across different mirror surfaces, achieving multi-pass pumping of the pump light and improving the beam quality of the output laser. Simultaneously, a focusless system structure is used to achieve multi-pass amplification of the signal light, improving the operability of optical adjustment. Furthermore, the system can achieve a common optical path for pumping and amplification, facilitating high-efficiency absorption of the pump light and optimal signal light gain amplification; it also allows for adjustment of the number of multi-passes, resulting in high system flexibility, low processing and debugging difficulty, convenient equipment maintenance, and ease of industrial application.

The invention discloses a high limiting factor GaN micro-disk laser suitable for electric driving, which is prepared based on an epitaxial wafer used by a silicon substrate GaN, and the epitaxial wafer structurally comprises a substrate layer, an AlGaN buffer layer, a u-GaN layer, an n-GaN layer, an n + GaN layer, a u-GaN layer, a quantum well and a p-GaN layer. And the n + GaN layer is of a uniform and sparse nanopore layer structure. By adopting the nanopore layer structure, the refractive index difference between the active region and the surrounding medium is improved, and the optical restriction in the microdisk is greatly enhanced. In the invention, the traditional Ti / Al / Ni / Au is not used as the p electrode, but the Cr / Au two-layer metal is used as the p electrode, and the deposition thicknesses are respectively 50 nm and 30 nm. The metal Cr can form ohmic contact on the surface of the p-GaN during current injection, so that the contact resistance is reduced, and the current injection efficiency of the micro-disk is improved.

This invention discloses a flow field measurement device and method for an annular combustion chamber, comprising: an intake system including an intake structure for connecting to the head of the annular combustion chamber, the intake structure having intake channels matching the number and circumferential position of the head of the annular combustion chamber; a tracer particle generator for injecting tracer particles into one or more intake channels to obtain a target tracer particle concentration in a target measurement area; an exhaust system including an exhaust structure for connecting to the tail end of the outer casing of the annular combustion chamber, the exhaust structure guiding the exhaust gas from the annular combustion chamber out; and a PIV measurement system for emitting sheet-like lasers into the interior of the annular combustion chamber at one or more preset circumferential positions and measuring the flow field within the annular combustion chamber.

The invention belongs to the technical field of laser amplification, and provides a light beam active control disc laser amplifier, which comprises a disc crystal used for realizing laser amplification; the seed light source is used for providing a polarization state to-be-amplified seed laser, the to-be-amplified seed laser is provided with a first diameter light spot at the disc crystal, and the size of the first diameter light spot is dynamically adjustable; the pumping device is used for pumping the disc crystal, and pumping light emitted by the pumping device has a second diameter light spot at the disc crystal; and the light spot adjusting assembly is used for dynamically adjusting the size of the first-diameter light spot, so that the ratio of the first-diameter light spot to the second-diameter light spot is within a preset range. According to the application, the spot diameter of the output seed amplification laser is monitored by using the spot analysis device, and the spot diameter of the seed light is calibrated in real time by using the surface shape adjusting mirror, so that the spot diameter is stably output from low to high pumping power and under power fluctuation, and the power of the output laser and the stability of light beam quality are ensured.

The invention provides a plant phenotype detection system and method based on a multi-wavelength Shanghai laser radar. The system comprises a laser emitting assembly and a receiving imaging assembly, the laser emitting assembly is used for emitting multi-wavelength coaxial sheet laser to irradiate a plant target, and different wavelengths correspond to reflection characteristic differences of plant tissues in different spectral bands; the receiving imaging assembly comprises a receiving lens and an image sensor, and the included angle between the optical axis of the receiving lens and the imaging plane of the image sensor is configured to meet the Saborne imaging condition, so that object points in the irradiation range of the sheet-shaped laser can be clearly imaged on the image sensor. The method comprises the steps of performing imaging acquisition on multi-wavelength laser reflection signals, performing response correction and decoupling on imaging signals based on multi-channel spectral response characteristics of an image sensor to obtain multi-wavelength reflection intensity information, and realizing plant structure identification and phenotype parameter extraction by combining three-dimensional point cloud data and multi-band spectral characteristics.

The invention discloses a device and method for measuring a flow field in a full-ring combustion chamber, and the device comprises an air inlet system which comprises an air inlet structure connected with the head part of the full-ring combustion chamber, and the air inlet structure is provided with air inlet channels which are matched with the number and circumferential position of the head part of the full-ring combustion chamber; the tracer particle generator is used for injecting tracer particles into any one or more gas inlet channels so as to obtain target tracer particle concentration in the target measurement area; the exhaust system comprises an exhaust structure used for being connected with the tail end of an outer casing of the full-ring combustion chamber, and the exhaust structure is used for guiding tail gas of the full-ring combustion chamber to be exhausted; and the PIV measuring system is used for emitting sheet laser to the interior of the full-ring combustion chamber at any one or more preset circumferential positions and measuring a flow field in the full-ring combustion chamber.

The invention discloses an electric pumping suspended polygonal micro-disk laser and a preparation method thereof, and belongs to the technical field of semiconductor photoelectronics. The laser takes a silicon-based LED epitaxial wafer as a carrier, and comprises a silicon substrate layer, an AlGaN buffer layer, an n-type gallium nitride layer, a quantum well layer, a p-type gallium nitride layer, a p-type electrode arranged on the p-type gallium nitride layer and an n-type electrode arranged on the upper surface of the n-type gallium nitride layer which are sequentially arranged from bottom to top, the micro-disk laser has a polygonal resonant cavity structure, and each vertex angle of the polygonal resonant cavity is connected with an output waveguide; the p-type electrode comprises a polygonal p-type electrode located on the polygonal resonant cavity and an annular p-type electrode located on the outer side of the output waveguide, and a plurality of Ag nanowires are arranged between the polygonal p-type electrode and the annular p-type electrode; the structure is simple, the preparation technology is mature, and the photoelectric characteristic is good.

The application discloses a high-energy femtosecond disc laser amplifier and a method for inhibiting spectral gain narrowing, accurate pre-shaping of seed light spectrum, pre-amplification of seed energy by a large-mode-area photonic crystal fiber, optimization of a disc regenerative cavity into a three-way structure to compensate gain, effective spectral broadening and high-quality compression of pulses, and stable output of high-energy and narrow-pulse-width femtosecond laser. A single-mode fiber seed source generates nanosecond single-mode pulse laser at a 1030 nm band and a megahertz repetition frequency; a photonic crystal fiber laser amplifier pre-amplifies pulse energy to a microjoule level and maintains single-mode output and high beam quality of laser; a spectral shaper performs hole-digging type pre-shaping on the spectrum of the pre-amplified pulse laser to inhibit severe spectral gain narrowing in the subsequent amplification process; a high-gain disc regenerative amplifier amplifies pulse energy from nanojoules to hundreds of millijoules and outputs pulses at a kilohertz repetition frequency; and a pulse compressor compresses the amplified pulses to a hundred femtosecond level.