17 results about "Laser beam quality" patented technology

The application discloses a high-brightness and high-power Raman photonic crystal fiber laser, which comprises a pump source and a Raman gain medium connected with the pump source; the Raman gain medium is a full-solid photonic crystal fiber in a long cone shape; the full-solid long cone photonic crystal fiber is continuously and proportionally reduced in the whole cone area, and constantly satisfies the double-mode operation condition in the working wavelength range; the thick end is the input end, and the thin end is the output end; the full-solid photonic crystal fiber comprises a core and a cladding from inside to outside; the cladding microstructure comprises a high-refractive-index matrix material and a low-refractive-index filling material; the filling material is filled in the matrix material and is arranged in a two-dimensional closest equilateral triangle lattice periodically; the microstructure of the filling material is arranged in a concentric circle along the radial direction of the center of the core, and the number of the microstructure is 3-5 circles. The laser can effectively improve the laser beam quality of the output end and realize single-mode laser output.

This invention provides a dynamic beam quality measurement device based on a fast deflecting mirror and a microlens group, comprising a first fast deflecting mirror, a second fast deflecting mirror, a microlens group, a focusing lens, and a charge-coupled device (CCD) camera arranged sequentially along the optical path. The first fast deflecting mirror reflects the laser beam to be measured onto the second fast deflecting mirror, and the second fast deflecting mirror reflects the laser beam modulated by the first fast deflecting mirror to the centers of different microlenses within the microlens group. The microlens group consists of multiple microlenses. The focusing lens is arranged in the transmission optical path of the microlens group, and the CCD camera is arranged at the focal point of the focusing lens in the transmission optical path of the focusing lens. In this invention, a single image acquired by the CCD camera can capture the distribution of four laser beam spots focused by lenses with different focal lengths. Combined with the high-speed deflection of the two fast reflecting mirrors, dynamic measurement of laser beam quality can be achieved while ensuring measurement accuracy.

The invention relates to the technical field of high-brightness laser testing, and discloses a high-speed light beam quality analyzer which is characterized in that a laser power attenuation device, an aberration-free focusing lens, a polarization-independent reflex mirror group, a light shutter, a two-dimensional virtual image phase array etalon group, a large-area-array camera and a residual light receiving barrel are sequentially arranged in the direction of a light path. After a to-be-measured light beam passes through the two-dimensional virtual image phase array device, distances from virtual images on a formed two-dimensional virtual image array to the large-area-array camera are different and meet an approximate arithmetic progression, so that the large-area-array camera can simultaneously measure a plurality of light spots at different transmission distances behind the aberration-free focusing lens; and finally, fitting a hyperbolic curve representing the beam quality through a partition image algorithm so as to obtain the quality of the laser beam to be measured at the current moment. According to the method, a displacement platform does not need to be moved in real time, the measurement speed mainly depends on the optical shutter switching rate, the camera sampling rate and the host calculation speed, and the method has the high-timeliness characteristic of data acquisition and analysis.

The invention discloses a carbon dioxide laser tube, which relates to the technical field of laser tubes and comprises a discharge tube, a discharge tube attachment bracket, a water cooling tube, a gas return tube, a gas storage tube, a total reflection mirror, a total reflection mirror tube orifice, an anode, an anode tungsten rod, an output mirror, an output mirror tube orifice, a cathode and a cathode tungsten rod, the discharge tube is arranged in the discharge tube attachment bracket in a penetrating manner; the discharge tube attachment bracket is arranged in the water cooling tube in a penetrating manner; the outer wall of the discharge tube attachment support makes contact with and fixes the water cooling tube, and the inner wall of the discharge tube attachment support makes contact with and fixes the discharge tube. According to the invention, spikes in the background technology are replaced by the discharge tube attachment bracket, so that the straightness of the discharge tube can be ensured, and the laser beam quality, the output power and the cutting performance are improved.

The invention discloses a light beam focusing control method and device for laser cutting equipment, and relates to the technical field of laser processing, and the method comprises the following steps: monitoring a laser beam of the laser cutting equipment in real time, and carrying out light beam quality analysis to obtain a light beam quality parameter; carrying out material thickness detection on the to-be-cut workpiece to obtain actual thickness data, and calculating a target focal depth numerical interval based on the actual thickness data in combination with the cutting process parameters; performing focusing dynamic adjustment according to the light beam quality parameter and the target focal depth numerical interval, and determining focusing lens group control data; and performing continuous cutting monitoring on the laser cutting equipment according to the focus lens group control data, and performing closed-loop correction on the focus lens group control data according to a monitoring result. The technical problem that traditional laser cutting focusing control cannot accurately adapt to workpiece thickness difference and laser beam quality fluctuation is solved, and the technical effects that laser cutting beam focusing is accurately adapted, and the cutting quality and stability are effectively improved are achieved.

The invention discloses a Raman selectable pulse fiber laser for acne treatment, and relates to the technical field of biomedical engineering treatment. Comprising a hemorrhoid treatment curative effect monitoring data acquisition module, a hemorrhoid treatment curative effect monitoring data optimization module, a wavelength accuracy prediction module, a pulse uniformity prediction module, a laser beam quality evaluation module, an optical fiber transmission detection module and a hemorrhoid treatment curative effect evaluation module. The hemorrhoid treatment effect correction module and the Raman selectable pulse fiber laser optimization module are combined with a random forest algorithm, a neural network algorithm, a multiple linear regression algorithm and a convolutional neural network algorithm to evaluate and calibrate the hemorrhoid treatment effect. The data entry technology, the random forest algorithm, the neural network algorithm, the multiple linear regression algorithm, the convolutional neural network algorithm and the acne treatment effect evaluation and calibration technology are closely combined with the modern information technology, and the precision of the acne treatment effect based on the Raman selectable pulse fiber laser is improved.

The utility model discloses a high-degree-of-freedom hard light path transmission device for laser shock peening, and the device comprises a transmission path adjustment assembly which is used for adjusting a transmission position in a three-dimensional space; the reflecting mirror group is arranged on the transmission path adjusting assembly and is used for reflecting the laser pulse emitted by the laser; the focusing lens and the galvanometer are installed at the end of the transmission path adjusting assembly, and the focusing lens is located above the galvanometer; one end of the angle adjusting assembly is connected with the reflector group, and the other end is connected with the transmission path adjusting assembly, and the angle adjusting assembly is used for adjusting the operation angle of the reflector group; and the controller is electrically connected with the transmission path adjusting assembly and the angle adjusting assembly. According to the high-degree-of-freedom hard light path transmission device, a more efficient, accurate and flexible solution is provided for the laser shock peening technology by improving the machining flexibility, optimizing the laser beam quality, accurately controlling the machining process, enhancing the adaptability and improving the system integration degree and reliability.

This invention proposes a gallium nitride-based semiconductor laser, comprising, from bottom to top, a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer. This invention incorporates a multi-layered, multi-vacancy electron-phonon modulation layer within the semiconductor laser element, defining the electron affinity distribution and polarization optical phonon energy distribution characteristics of each multi-vacancy electron-phonon modulation layer. This forms single-vacancy, vacancy cluster, and multi-vacancy modulated electron-phonon structures, localizing electron-phonons between the lower confinement layer and the lower waveguide layer. This reduces the Stokes shift caused by the photon energy difference between the pump light and the oscillating light, reduces heat loss from phonon vibration and phonon transport, improves the heat dissipation of the laser element, mitigates interlayer thermal mismatch, suppresses the thermal lensing effect and stress birefringence effect of the laser, improves laser beam distortion and depolarization, and enhances the laser beam quality factor.

The invention relates to the technical field of laser regulation and control, in particular to a light beam regulation and control and monitoring device which comprises a beam expander assembly and a monitoring assembly. The beam expanding lens assembly comprises a prism structure and a driving part, the prism structure is connected with the driving part, and the relative position of the prism structure and the incident laser beam is adjusted through the driving part; the monitoring assembly comprises a monitoring camera, and the monitoring camera is used for receiving the laser beam emitted by the beam expander assembly and obtaining the beam quality information of the laser beam. The laser beam enters the to-be-detected product through the beam expander assembly, the monitoring assembly is used for monitoring the beam quality of the laser beam in real time, the current laser beam quality is judged based on the obtained beam quality information, and the laser beam quality can be adjusted by changing the position of the prism structure. The process can form a closed-loop system for monitoring and regulation. According to the technical scheme, the laser beams can be accurately and stably controlled, so that the detection precision and accuracy of the to-be-detected product are ensured.

Disclosed is a self-optimizing beam combining apparatus and method for semiconductor laser beam quality in the technical field of dense spectral beam combining. The apparatus includes a semiconductor laser array, a fast axis collimator array, a slow axis collimator array, a mirror array, a volume Bragg grating array, and an external cavity mirror. A resonant external cavity is formed between a rear facet of each semiconductor laser and the external cavity mirror; after being diffracted by a volume Bragg grating, a portion of laser light transmitted to the external cavity mirror is reflected back onto the volume Bragg grating by the external cavity mirror; the volume Bragg grating utilizes its spectral selection characteristics to diffract a laser mode satisfying a Bragg diffraction condition into a chip of the semiconductor laser, and mode competition characteristics of the semiconductor laser enhance the laser mode to become a dominant lasing mode.

The invention belongs to the technical field of solid lasers, and discloses a multi-thin-rod solid laser system based on pump light pipe wall reflection, a pump structure is arranged in a multilayer concentric circle structure, laser crystal thin rods are arranged on the central axis of an inner layer, and 90-degree rotating sheets are used between the laser crystal rods to eliminate thermally induced birefringence; placing a cylindrical cooling glass tube outside the laser crystal thin rod; the laser crystal thin rod is in direct contact with flowing cooling liquid; the outermost layer is a cylindrical tube plated with a high-reflection film; the pumping source is a pumping system composed of a plurality of semiconductor lasers and is incident from the end face of the cylindrical cavity in a divergent mode, and pumping light is reflected by the cylindrical pipe wall with the outer layer plated with a high-reflection film for multiple times, so that energy of the pumping light is absorbed by the laser medium thin rod for multiple times. Heat generated in the laser medium is taken away by the flowing cooling liquid, the high-power-density pump light can be borne, the laser beam quality is guaranteed, and high-power laser output can be obtained through multi-rod serial connection arrangement.

The invention relates to a scanning scattering type light beam analyzer, which comprises an imaging scanning mechanism for realizing full-view-field acquisition of light beam scattered light through multiple positions of a light beam propagation path, and the imaging scanning mechanism adopts a movable imaging assembly or a fixed array type imaging assembly. The imaging unit comprises an imaging darkroom, a field diaphragm, an imaging lens and a camera; the upper computer is electrically connected with the scanning mechanism and the camera, controls the scanning mechanism to collect scattered light images at different positions, carries out splicing processing on the images, calculates a light beam center position and a light beam width based on the spliced images, fits propagation parameters of a laser beam according to the light beam center position and the light beam width, and carries out detection on the laser beam according to the propagation parameters. And finally obtaining a laser beam quality index. The laser beam is scanned and imaged to realize multi-position high-resolution imaging and Rayleigh length coverage, the beam acquisition stability is high, and the measurement accuracy is improved; and the device is adaptive to high-power, short-wave and other high-beam-quality lasers.

The application discloses a high-power laser shutter based on wedge-shaped mirror tuning laser beam quality, which comprises an input end, a collimating mirror, a reflecting mirror and a light receiver arranged in sequence along a laser input light path, at least two switches and a light receiver arranged in sequence along a light path reflected by a front surface of the reflecting mirror, and a focusing mirror and an output end arranged in sequence along a light path reflected by a front surface of each switch, wherein each switch comprises a plurality of wedge-shaped mirrors capable of cutting into the light path, and a plurality of output ends output laser beams alternatively or at least two output ends output laser beams simultaneously.

The utility model relates to a laser beam quality detection and analysis platform, in particular to the technical field of laser detection equipment. Comprising a supporting frame, a wire slot, a first movable mounting plate, a second movable mounting plate, a vertical plate, a moving mechanism, a laser beam emitter, a mounting block and a probe. The defects that the center of a detection area of a probe is mainly adjusted manually at present, and the working efficiency is greatly reduced are overcome; in addition, other light beam quality detection probes cannot be rapidly installed on an existing analysis platform.

The utility model discloses a laser beam quality detection and analysis platform, and relates to the field of laser quality detection equipment. The device comprises a main body, an adjusting mechanism and a connecting mechanism, the adjusting mechanism comprises a fixing plate and a fixing column, and through the arrangement of the adjusting mechanism, a first motor and a second motor respectively pass through a rotating rod and a lead screw through a first knob and a second knob; precise fine adjustment of the external laser spot image analyzer and the laser base is achieved, the situation that an operator needs to repeatedly observe a computer and adjust equipment back and forth is effectively avoided, the adjusting precision is improved, meanwhile, the operation process is simplified, the operation efficiency is improved, knotting and scattering caused by too long connecting wires can be effectively avoided through the winding column, and the working efficiency is improved. Meanwhile, the USB interface and the connecting line on the two sides of the main body are connected with an external laser spot image analyzer and an external computer respectively, so that the situation that the position of the analyzer deviates or equipment is damaged due to the fact that the connecting line is pulled when an operator moves the computer or desktop articles is effectively avoided.

The application discloses a Raman selectable pulse fiber laser for acne treatment and relates to the technical field of biomedical engineering treatment, and comprises a hemorrhoid treatment effect monitoring data acquisition module, a hemorrhoid treatment effect monitoring data optimization module, a wavelength precision prediction module, a pulse uniformity prediction module, a laser beam quality evaluation module, a fiber transmission detection module, a hemorrhoid treatment effect evaluation module, a hemorrhoid treatment effect correction module and a Raman selectable pulse fiber laser optimization module. The Raman selectable pulse fiber laser is combined with a random forest algorithm, a neural network algorithm, a multiple linear regression algorithm and a convolutional neural network algorithm to evaluate and calibrate the hemorrhoid treatment effect. The data entry technology, the random forest algorithm, the neural network algorithm, the multiple linear regression algorithm, the convolutional neural network algorithm and the hemorrhoid treatment effect evaluation and calibration technology in the application are closely combined with modern information technology, and the precision of the hemorrhoid treatment effect based on the Raman selectable pulse fiber laser is improved.

The invention relates to the technical field of laser beam quality detection, and particularly discloses an off-axis beam quality detection method based on a metasurface, and the method is realized based on the following system: the system comprises a light source, and a to-be-detected beam emitted by the light source is red light with unknown wavefront phase distribution; the light beam processing system is composed of a polarizer and a 1 / 4 wave plate; the light beam separation system is used for separating light beams in a working area of the light beam separation system at a certain angle; the off-axis light beam quality analysis system consists of a CCD (Charge Coupled Device) camera and an analysis computer; and the off-axis detection light path is used for receiving the off-axis light beam deflected by the metasurface and guiding the off-axis light beam to a light beam quality analyzer (such as a CCD camera, a wavefront sensor and the like). According to the off-axis light beam quality detection method based on the metasurface, original optical elements do not need to be dismantled or moved, the troubleshooting process is greatly simplified, a large amount of debugging time and labor cost are saved, and the off-axis light beam quality detection method based on the metasurface is particularly suitable for an integrated or sealed light path system or a light path system with the high stability requirement.