447 results about "Divergence angle" patented technology

The invention discloses a low-divergence-angle narrow-linewidth high-power semiconductor laser. Relates to the technical field of semiconductor lasers, in particular to a low-divergence-angle narrow-linewidth high-power semiconductor laser. According to the invention, the parabolic waveguide structure is etched in the light field expansion area, and the metal reflector is introduced to realize a novel light field expansion and metal reflector integrated structure, and the transverse divergence angle of a laser mode is reduced through the expansion structure at the tail end of the waveguide. The laser comprises a laser gain area, a light field expansion area and a spectrum purification area at the tail of the light field expansion area. The laser gain region, the light field expansion region and the spectrum purification region at the tail part of the light field expansion region are made of the same laser epitaxial material in the longitudinal direction, the laser gain region is adjacent to the light field expansion region along the horizontal light emitting direction, and the light field expansion region is adjacent to the spectrum purification region at the tail part of the light field expansion region along the horizontal light emitting direction; the longitudinal direction is the direction from the substrate to the contact layer.

The invention relates to the technical field of optical communication equipment testing, in particular to an integrated optical module multi-parameter testing system and method.The method comprises the steps that a multi-channel parallel testing unit synchronously collects light spot morphology, divergence angles, insertion loss and return loss space and transmission characteristic parameters through a transmission light path and a reflection light path; the parameter collaborative analysis module performs nonlinear correlation analysis and dynamic performance threshold evaluation based on a cross-dimension correlation model; the intelligent calibration engine dynamically adjusts the test benchmark and compensation parameters according to the environment temperature and the equipment aging attenuation model; the fault diagnosis and prediction unit identifies potential defect types of the collimator, constructs a performance degradation prediction model in combination with a working state and environmental stress, and predicts a performance evolution trend according to test data; and the test report generation module automatically generates a standardized and customized dual-mode test report, a quality grade label and a performance optimization suggestion according to the prediction result and the diagnosis conclusion. Therefore, the problems of poor test precision, low test efficiency and the like in the prior art are solved.

The invention relates to the technical field of axial focusing enhancement of a cyclotron, and provides an axial focusing enhancement method and system for a medical cyclotron, and the method comprises the steps: collecting vibration data, a beam intensity value, temperature data, the positions of all particles in a particle beam, the average magnetic field intensity, the magnetic field intensity difference, and the current; the divergence angle and energy of the particle beam are measured; determining an axial focusing effect evaluation value at the current sampling moment; determining the particle beam stability at the current sampling moment, and determining the magnetic field uniformity at the current sampling moment by combining the average magnetic field intensity and the magnetic field intensity difference at the current sampling moment; and the axial focusing effect evaluation value, the average magnetic field intensity and the current at the current sampling moment are combined to realize the axial focusing enhancement of the medical cyclotron. According to the invention, the focusing precision of axial focusing enhancement of the medical cyclotron and the stability of the focusing effect can be improved.

The invention discloses a non-contact measurement system and method for the longitudinal distance between objects, and the method comprises the steps: measuring the position distance between an object and an adjacent object in a size-limited space: placing a light source on the surface of a workpiece, projecting an electromagnetic beam with a set divergence angle to a reference object, and forming an amplified light spot; image information, especially light intensity information, of the light spot and a part of reference object where the light spot is located at the projection position is received through a light receiver; and then the processor processes the image information to obtain geometric data of the light spots, including the positions of the light spots on the reference object, the lengths of the obtained light spots or the distances between different light spots, namely the projection lengths, the projection height from the light source to the reference object is calculated in combination with the divergence angle, and the longitudinal distance between the workpiece and the reference object is obtained in combination with the height of the light source. As long as the size of the light source is small enough and the light source can be placed into the chamber for processing the wafer, the longitudinal distance between the wafer and the top of the chamber can be accurately measured at any time, and the measurement accuracy related to wafer manufacturing is greatly guaranteed.

The invention relates to the technical field of projection modules, and particularly discloses an LCOS laser projection module, which comprises a laser light source module, a laser speckle eliminator, a reflector, a diffuser, a collimating lens, a fly-eye lens, a relay lens, a first linear polarizer, a polarizing beam splitter, an LCOS chip, a second linear polarizer and a projection lens which are sequentially arranged along a light transmission path, the laser light source module is provided with a light source optical axis and is used for emitting light, and the light is projected by the projection lens after being modulated along a light transmission path to form a projection image. The light emitted by the laser light source has the advantages of narrow divergence angle, small light-emitting area and good light concentration and collimation, the resolution of a projected image can be improved, the projected image is bright in color and high in definition, and the requirements of simple structure and small size are met. Meanwhile, the laser speckle can be eliminated through the matching of the laser speckle eliminator and the diffusion sheet, and the projection image can meet the high contrast through the existence of the first linear polarizer and the second linear polarizer.

The utility model belongs to the field of laser application, and relates to beam shaping of a laser, in particular to a small-divergence-angle laser based on a beam shaping technology. The problems that in the prior art for laser diode collimation, astigmatism of the diode cannot be calibrated through single-lens collimation, and cost is increased due to the fact that fast axis collimation and slow axis collimation need to customize a fast axis collimating lens with a proper focal length are solved. The utility model discloses a small-divergence-angle laser based on a beam shaping technology. A first collimating lens, a fast-axis beam shrinking device and a beam expander are sequentially arranged on an emergent light path of a first laser diode; the light emitting point of the first laser diode is located at the focal point of the first collimating lens, the fast axis beam shrinking device comprises a first cylindrical lens and a second cylindrical lens, and the focal points of the first cylindrical lens and the second cylindrical lens coincide. According to the utility model, the divergence angle of the laser diode is reduced to 0.1 mrad, so that the diameter of a light spot at 500m is less than 100mm, and the actual light spot observed in an experiment is 80mm.

A handheld drone denial device, characterized in that the device comprises a laser emission unit comprising a high peak power pulsed laser and an adjustable beam expander, a sighting unit comprising a range finder and a sighting scope, a control unit comprising a denial device start and laser emission unit trigger switch, a power supply and a housing, the configuration of the laser emission unit, sighting unit, control unit, power supply, the structure of the housing and the arrangement of the units including the power supply on the carrier satisfy that the device discovers, locks and measures the range of a drone target through the sighting unit, manually or automatically adjusts the output laser beam divergence angle of the beam expander according to the range measurement result, and then or simultaneously triggers the laser emission unit trigger switch to emit laser to the drone target, wherein the adjustment of the beam expander includes that the adjustment of the beam divergence angle from a range of 500 meters to a range of 100 meters is incremental adjustment, or the adjustment of the beam divergence angle from a range of 100 meters to a range of 500 meters is decremental adjustment.

The invention provides a coupling system for an on-chip light source and a photon chip. The coupling system comprises an input light source, a collimating lens, a focusing lens, a reflecting prism and an on-chip grating which are sequentially arranged in the direction of a light path, and an optical waveguide located on the side face of the on-chip grating. The collimating lens is used for primarily shaping emergent light of an input light source into a collimated light beam, the focusing lens is used for focusing the collimated light beam to the on-chip grating, and the collimating lens and the focusing lens are both aspheric plano-convex lenses. According to the system, non-uniformity caused by a large divergence angle of the semiconductor laser is effectively corrected through the aspheric micro lens, output of approximately parallel light beams is achieved, the light beams are accurately focused to the photon chip grating through the aspheric focusing lens subsequently, the coupling efficiency of light energy is greatly improved, and compared with two cylindrical lenses in the prior art, the coupling efficiency of light energy is greatly improved. The design of the focusing lens and the reflector is added, so that the number of optical elements is reduced, and error accumulation is reduced.

The invention discloses a light spot beam divergence angle calculation method and device based on adaptive threshold correction and a medium, and relates to the technical field of laser communication. The method comprises the following steps: continuously acquiring a debugging light spot picture output by image acquisition equipment, and calculating the maximum gray value of the debugging light spot picture; based on the maximum gray value, the exposure of the image acquisition equipment is adjusted until an initial light spot picture with the maximum gray value and the number of pixels reaching a preset threshold value is output; based on a preset initial pixel threshold value, calculating a pixel value variance of the initial light spot picture, and updating the initial pixel threshold value until a target pixel threshold value enabling the pixel value variance to reach a maximum value is obtained; setting a pixel value lower than a target pixel threshold value in the initial light spot picture to zero to obtain a target light spot picture; and calculating a first moment and a second moment of the target light spot picture to obtain a light spot beam divergence angle of the target light spot picture. According to the method, the calculation precision of the beam divergence angle of the light spot is improved by adjusting a threshold selection mechanism for maximizing the exposure degree and the variance.

The invention discloses an underwater optical communication routing method based on a three-dimensional dynamic conical sector, belongs to the technical field of underwater wireless communication, and is used for solving the problems of poor routing stability, low communication success rate, high energy consumption, non-adaptive path and the like in the existing underwater optical communication network. The method comprises the following steps: constructing an underwater optical communication network model in a three-dimensional space, and defining a dynamic cone communication sector based on a divergence angle and a direction angle between nodes; discovering neighbor nodes through a conical scanning mechanism, and performing multi-index optimization on candidate forwarding nodes based on distance progress, expected progress, energy efficiency indexes and time delay indexes; selecting an optimal path according to an evaluation result; performing competition coordination among candidate nodes by using a fast time slot response mechanism, and selecting a next hop node; and completing path construction through hop-by-hop transmission, dynamically adjusting a divergence angle, and executing path maintenance and updating. The method does not need global topological information, and is suitable for an underwater communication scene with uncertain node distribution in a dynamic environment.

The invention relates to the technical field of lasers, and discloses a parameter design method of an optical system, the optical system, a device and electronic equipment, the optical system comprises a laser, an optical fiber and a collimating lens, the optical fiber is a rectangular optical fiber with a rectangular core layer or a barrel-shaped optical fiber with a barrel-shaped core layer, and the method comprises the following steps: according to the size and imaging distance of a first light spot, determining the size of the first light spot; determining the residual divergence angle of the laser after passing through the collimating lens; determining the focal length of the collimating lens according to the residual divergence angle and the side length of the core layer; according to the ratio of the focal length to the side length of a core layer, whether the optical fiber is determined to be a barrel-shaped optical fiber is determined, and the core layer of the barrel-shaped optical fiber is composed of a plurality of arcs; and under the condition that the optical fiber is a barrel-shaped optical fiber, determining the curvature radius corresponding to each arc in the plurality of arcs according to the focal length and the side length of the core layer. According to the invention, distortionless rectangular homogenized light spots can be obtained under a large divergence angle.

The invention discloses a safe and hidden quasi-omnidirectional full-duplex laser communication device, system and method, and solves the technical problems that the position and orientation of an existing laser communication system have a leakage risk, and the existing laser communication system is difficult to adapt to a wide-angle communication application scene due to a small receiving and transmitting view field. The laser communication system comprises at least one active communication device and at least one passive communication device which are paired with each other, and the active communication device comprises a rotary table unit and a body arranged on the rotary table unit; the body is provided with a first main control unit, an optical signal generation unit, a divergence angle adjustment unit, an optical field regulation and control unit, a first optical receiving unit and a first acquisition processing unit; the passive communication device comprises a second optical receiving unit, a second collecting and processing unit and a second main control unit. According to the invention, the position, orientation and data leakage risks of two communication parties are reduced, and double-end full-duplex communication is realized at the same time.

A Light Detection and Ranging (LIDAR) system includes a light source configured to emit a plurality of light beams having respective divergence angles over respective fields of illumination, and a detector array comprising plurality of detector pixels having respective fields of detection and configured to output respective detection signals responsive to light incident thereon. The respective fields of detection of the detector pixels are greater than or equal to the respective divergence angles of the light beams. Related devices and methods are also discussed.

According to the capturing and tracking integrated space laser communication terminal and the inter-satellite laser communication method, a capturing mechanism and a tracking mechanism of the laser communication terminal adopt the same mechanism assembly, when capturing and link building are carried out in orbit, a large-stroke fast reflecting mirror is used for carrying out directional scanning, and after an opposite satellite laser communication terminal receives a light beam of the satellite laser communication terminal of the opposite party, the capturing and tracking are carried out; the laser communication terminals of the two parties immediately switch to fine tracking link establishment; and if the satellite position of the opposite side exceeds the scanning range of the satellite laser communication terminal of the local side, pre-pointing and angle unloading correction are carried out by using a satellite platform of the local side. The design that receiving communication light and transmitting communication light of receiving and transmitting optics of the laser communication terminal share one optical assembly is simple and reliable, a large divergence angle is adopted, a large scanning area is achieved, the capturing time is shortened, and the capturing probability is improved. According to the invention, a capturing and tracking integrated design scheme is adopted, so that the system complexity, weight, size and power consumption of the laser communication terminal are reduced.

The invention discloses a three-dimensional asymmetric photonic crystal laser and a preparation method thereof. An epitaxial structure of the three-dimensional asymmetric photonic crystal laser comprises an N-type electrode, an N-type InP substrate, an N-type Al < x > < 1 > In < 1-x > < 1 > As upper limiting layer, a quantum well active region, a P-type Al < y > < 1 > In < 1-y > < 1 > As electron barrier layer, a P-type Ga < z > < 1 > In < 1-z > < 1 > Asz < 2 > P < 1-z > 2 functional layer, a P-type Al < x > < 2 > In < 1-x > < 2 > As lower limiting layer, a P-type InP connecting layer, a bottom insulating layer and a P-type electrode, wherein a three-dimensional asymmetric photonic crystal is etched on the P-type GaInAsP functional layer, and a chiral characteristic is introduced by destroying the symmetry of the photonic crystal, so that the P-type GaInAsP functional layer vertically emits a single-mode light beam with left-handed or right-handed circular polarization. By designing an asymmetric photonic crystal structure, efficient output of circularly polarized light beams is achieved, polarization selectivity and light beam quality are remarkably improved, and the advantages of low divergence angle and high light beam stability are achieved.

The invention discloses a laser beam divergence angle measuring method based on image fusion, and belongs to the field of photoelectric testing. A supersaturated light spot image and an unsaturated light spot image are fused to obtain an ideal fused image, the beam width of a light beam is obtained in a mode of calculating the second moment of the light spot, and then the divergence angle of the laser beam is obtained; according to the method, background noise of CCD camera imaging is removed by imaging the imaging plane in the shielding state for multiple times, and salt and pepper noise is removed by means of median filtering, so that the measurement precision is improved.

The invention discloses a real-time positioning method for a weld track, and belongs to the technical field of laser positioning, and the method comprises the steps: obtaining an environment state coefficient based on the environment light intensity and the temperature of a structured light emitter; a welding state coefficient is obtained based on the welding smoke particle concentration and the arc light intensity; acquiring an environment stability coefficient based on the welding state coefficient and the environment state coefficient under the vibration amplitude of the current structured light emitter; obtaining a structured light stability coefficient based on the laser wavelength, the line width and the power of the structured light emitter; obtaining a distance-reflection matching degree based on the laser working distance and the workpiece surface reflectance under the environment stability coefficient and the structured light stability coefficient; constructing a divergence angle optimization model based on the distance-reflection matching degree and the current laser divergence angle to output a target laser divergence angle; according to the method, high-precision real-time positioning of the welding seam track under the strong interference environment is achieved through multi-model cooperation, and the robustness and adaptability of a welding automation system are remarkably improved.

The invention discloses a method for detecting a focal plane of a focusing lens of a high-energy laser, which aims to solve the problems of low precision, easy device damage, complex operation and the like of the existing detection system in a high-power laser scene, and comprises the following steps of: constructing an optical path system comprising a 1 / 2 wave plate, a polarization beam splitter prism, a 1 / 4 wave plate, an aperture diaphragm and a reflector, and utilizing a polarization state modulation principle to detect the focal plane of the focusing lens of the high-energy laser. And the reflected light is converted into S polarized light which is detected by a power meter detector. A power-position curve is drawn by moving the reflector and recording power and position data, and a critical point of power rapid attenuation is used as a focal plane measurement value. And a theoretical error introduced by the laser divergence angle is compensated by further combining a pre-generated error curve (obtained through simulation fitting), so that high-precision positioning of the focal plane is realized.

The light transmission structure comprises a light transmission piece and a plurality of light source sets, the wavelengths of light emitted by the light source sets are different, the light transmission piece is provided with a plurality of independent light inlet channels, each light inlet channel is provided with a light inlet and a light outlet, the light inlets correspond to the light source sets in a one-to-one mode, and the light source sets are arranged on the light inlet channels in a one-to-one mode. The light outlets correspond to the light inlet side of a prism of the refractometer, and the light inlet channels are arranged at intervals and are crossed with one another, so that divergence angles of light beams emitted by the light outlets are adjusted, the light beams are ensured not to be overlapped after being imaged, namely a bright-dark interface is relatively clear during imaging, the measurement accuracy of the refractive index of liquid is ensured, and the measurement accuracy of the refractive index of the liquid is improved. And the calculation deviation of the liquid concentration is ensured to be within a reasonable range.

The invention provides a laser communication device for rapid link establishment and networking and a satellite internet constellation. The device utilizes the wavelength division multiplexing unit and the pre-aiming unit to realize beam combination of receiving and transmitting optical path signals so as to improve the coaxiality of receiving and transmitting branches; an optical fiber displacement device arranged on the transmitting-receiving lens is used for adjusting the relative position of the beam combining optical fiber and the focal point of the transmitting-receiving lens, and continuous beam changing of a transmitted light path signal within the divergence angle range of 55-1000 microrad is achieved; and a position sensing unit is matched to focus a receiving light path signal, so that a 0.2-1-degree receiving light path continuous field of view is realized. Through 10000 times of offset error estimation simulation, the coverage rate of an uncertain area to a target light spot reaches 99.32%, and about 1mrad beam change can be realized, so that minute-level capture efficiency is realized under the condition of the continuous field of view.

The utility model provides a small-divergence-angle anti-reflection laser. The small-divergence-angle anti-reflection laser comprises a substrate; the active region is formed on the substrate; the etching region is positioned on the light emitting end surface of the active region and comprises a divergence angle improving layer; the cladding extends along the light emitting direction of the active region; the metal contact layer covers the cladding layer above the active region; the isolation layer covers the cladding layer above the etching region; and an N-metal layer and a P-metal layer, the N-metal layer covers the back surface of the substrate, and the P-metal layer covers the metal contact layer and the isolation layer. Through the arrangement of the isolation layer, current injection into the end face can be limited, the light emitting power density of the end face can be reduced, the non-radiative recombination process can be inhibited, the temperature of the end face is reduced in the area, optical catastrophe damage can be reduced, and the service life of the laser can be prolonged.

The invention discloses a device and method for tracking the angle of a long-distance target object, and the device comprises a laser transmitting and receiving end and a target object, and the laser transmitting and receiving end is disposed on a precise adjustment mechanism. The precise adjusting mechanism is used for bearing the laser transmitting and receiving end and adjusting a laser incident angle to realize continuous tracking of a target; the laser transmitting and receiving end comprises a transmitting module and a receiving module; the transmitting module is used for transmitting a beam of wide-spectrum detection laser with a small divergence angle to a long-distance target object; the transmitting module comprises a wide-spectrum laser and a light beam expanding system, the wide-spectrum laser is electrically connected with the high-stability temperature control and current driving system, and the receiving module comprises an optical receiving module and a data processing and control module. The initial wavelength lambda is taken as the reference in each measurement, no accumulative error exists, and the method is very suitable for long-term and continuous monitoring tasks.

The utility model provides a beam expanding magnification detection device of a beam expander. The beam expanding magnification detection device comprises a laser, a collimating lens group, a detection assembly and the beam expander, the laser is used for emitting laser beams; the collimating lens group is used for collimating laser beams emitted by the laser; the detection assembly is used for detecting the collimation degree of the laser beam passing through the collimating lens group and detecting the size of a first light spot of the laser beam passing through the collimating lens group; the beam expander is used for expanding the laser beam collimated by the collimator group; the detection assembly is further used for detecting the collimation degree of the laser beam passing through the beam expander and detecting the size of a second light spot of the laser beam passing through the beam expander. When the beam expanding multiplying power detection device of the beam expanding lens is used, the divergence angle of the laser is adjusted through the collimating lens set, so that the laser beam before entering the beam expanding lens is collimated light, after the collimation degree of the laser beam is measured, the incident light spot and the emergent light spot of the beam expanding lens are measured, and the beam expanding multiplying power of the beam expanding lens is obtained.

A projection apparatus, comprising: a light modulation assembly (10), a dimming film (40), a transflective mirror (20), and a reflective mirror (30). The dimming film (40) is arranged on the light exit side of the light modulation assembly (10), and the transflective mirror (20) is arranged on the side of the dimming film (40) distant from the light modulation assembly (10); when a plurality of first light rays (L1) emitted from the light modulation assembly (10) pass through the dimming film (40), a plurality of corresponding second light rays (L2) are formed and emitted to the transflective mirror (20), and at least some of the second light rays (L2) are reflected by the transflective mirror (20) to the reflective mirror (30) and are then reflected by the reflective mirror (30) to the transflective mirror (20) to be emitted; among the plurality of first light rays (L1), the first light rays (L1) of which the divergence angles are greater than a first preset value are target light rays, and the divergence angles of second light rays (L2) corresponding to at least some of the target light rays are less than the divergence angles of the target light rays.

The application provides a gallium nitride-based semiconductor laser with a divergence angle modulation layer, which comprises, from bottom to top, a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer, an electron blocking layer, an upper limiting layer and a contact layer, wherein the lower limiting layer comprises, from bottom to top, a first lower limiting layer, a second lower limiting layer and a third lower limiting layer, a first divergence angle modulation layer is arranged between the substrate and the first lower limiting layer, and a second divergence angle modulation layer is arranged between the second lower limiting layer and the third lower limiting layer. The normalized Al atomic concentration curves of the SIMS tests of the first divergence angle modulation layer and the second divergence angle modulation layer both satisfy Lorentz function distribution, so that a carrier transverse expansion region is formed in the first divergence angle modulation layer and the second divergence angle modulation layer, the transverse expansion and mobility of carriers are enhanced, the active layer recombination width in the horizontal divergence angle direction of the laser is increased, and the horizontal divergence angle is enlarged.

The invention provides a quantum dot DFB laser based on a substrate buried grating. The quantum dot DFB laser comprises a substrate; the buffer layer is formed on the substrate; the N-type doped lower coating layer is formed on the buffer layer; the quantum dot active region is formed on the N-type doped lower coating layer; the P-type doped upper coating layer is formed in the quantum dot active region; and the N-type doped lower coating layer comprises a buried grating structure layer. The invention further provides a preparation method of the quantum dot DFB laser based on the substrate buried grating, and the flow ratio and the growth rate of the five-family elements and the three-family elements are optimized when the grating layer grows and the grating layer is buried. Through the design that the grating is buried on the lower substrate, the problem of damage of high temperature to a quantum dot active region in a traditional process is reduced, meanwhile, the limiting layer epitaxial design is optimized, the vertical divergence angle of a light field is reduced, the optical fiber coupling loss is reduced, and multi-mode oscillation is reduced.

The invention relates to a rapid scanning type laser active detection system based on laser angle on-line control, and the system comprises an adjustable beam expanding optical unit which can continuously adjust the beam expanding multiplying power on line through position closed-loop control; the scanning detection execution unit can perform large-range search and can compensate image motion caused by carrier motion and continuous scanning, and a variable-speed spiral scanning mode with high probability of finding a target is adopted as a scanning mode; the off-axis beam expanding unit is used for further compressing a laser divergence angle; the photoelectric imaging system can splice scanned images on line, so that the scanning process is clearer and more visual; and the time sequence control unit assists in image motion compensation control. The scanning process can be rapidly completed, imaging is clear in the scanning process, and the scanning result can be directly presented.

The invention relates to a semiconductor laser with a light field expansion layer and a preparation method thereof, and the semiconductor laser sequentially comprises a substrate, a buffer layer, an N-type limiting layer, an N-type waveguide layer, an active layer, a P-type waveguide layer, a P-type limiting layer, and an ohmic contact layer along the epitaxial growth direction. Wherein an N-type light field expansion layer with gradually-changed components is inserted between an N-type limiting layer and an N-type waveguide layer, and a P-type light field expansion layer with gradually-changed components is inserted between a P-type waveguide layer and a P-type limiting layer, so that the distribution of a light field in a device is regulated and controlled, and the light field distribution range in the laser is enlarged; therefore, the semiconductor laser can obtain a lower fast-axis far-field divergence angle on the basis of using a thinner waveguide layer.

The invention provides a distributed photonic crystal semiconductor laser and a design method thereof, and is applied to the field of semiconductor lasers. The semiconductor laser comprises a substrate, an N-type limiting layer, a distributed photonic crystal layer, an N-type waveguide layer, an active layer, a P-type waveguide layer and a P-type limiting layer which are sequentially stacked from bottom to top, wherein the distributed photonic crystal layer comprises high-refractive-index layers and low-refractive-index layers which are alternately stacked, the thickness distribution of the photonic crystal layer is completely non-periodic, and the thickness of each refractive-index layer can be any value and does not follow a fixed period or uniform thickness constraint any more. Through the structure and the design method thereof, the far-field energy divergence angle of the semiconductor laser can be effectively reduced.

The application provides a system for adjusting a light beam, which can be applied to an optical system with high requirements for a reflected wave front. The system comprises a mirror, a surface shape detection device, a calculation and analysis device, and a compensation light generating device. The mirror is used to receive incident light from a first light source and emit reflected light. The surface shape detection device is used to obtain information about an initial surface shape of the mirror after the incident light is incident. The calculation and analysis device is used to generate first indication information according to the information about the initial surface shape, the first indication information indicating that the compensation light generating device emits first compensation light to the mirror. The compensation light generating device is used to emit the first compensation light to the mirror according to the first indication information, the first compensation light being used to change the initial surface shape of the mirror into a first surface shape. The system of the application not only can maintain the wave front of the reflected light, but also can improve the accuracy of regulating and controlling the direction and divergence angle of the reflected light.