235 results about "Gaussian beam" patented technology

The invention is suitable for the technical field of laser processing, and provides laser processing equipment. The laser processing equipment comprises a laser device used for emitting a laser beam; the light path switching system is used for deflecting the laser beam to a flat-topped light path or a Gaussian light path, the laser beam is output in a flat-topped light beam mode through the flat-topped light path, and the laser beam is output in a Gaussian light beam mode through the Gaussian light path; the processing head is used for deflecting the emergent direction of the flat-topped light beam output by the flat-topped light path or the Gaussian light beam output by the Gaussian light path and guiding the flat-topped light beam or the Gaussian light beam to a preset processing position; and the controller is coupled to the light path switching system through communication and is used for controlling the light path switching system to switch the laser beam between the flat-topped light path and the Gaussian light path according to processing requirements. In the embodiment of the invention, the laser processing equipment can be quickly switched among the laser beams in different modes, so that the processing efficiency can be improved.

The invention belongs to the technical field of radiation effect and radiation hardening of semiconductor devices and integrated circuits, and particularly relates to a single event effect laser simulation system based on Bessel beam shaping. A Bessel beam shaping and focusing module based on an axon lens is introduced and composed of the axon lens and two lenses, namely a single lens and a focusing lens, a Gaussian beam of an incident beam is shaped into a quasi-Bessel beam, and the quasi-Bessel beam is utilized to irradiate a semiconductor device to be detected. The axial distribution of the light beam is kept unchanged in a range of hundreds of microns, and the focusing breaking through the diffraction limit is realized in the radial distribution, so that the effect closer to the heavy ion charge deposition track is generated. The technology can solve the problem that a multilayer structure device, a thick sensitive region device and a wide forbidden band device are difficult to test through traditional laser simulation, and has important practical value for promoting laser simulation of the single event effect.

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

The invention relates to the technical field of optical control, in particular to a micro-nano particle optical control method and device based on circularly polarized light. The invention aims to solve the problem of insufficient flexibility of optical control. The optical control method comprises the following steps: pre-processing micro-nano particles to be controlled; the initial Gaussian beam is processed into a circular polarization tube type beam through a beam shaping module, a light guiding module and a polarization regulation and control module, and the micro-nano particles are irradiated from the position above the gas-liquid interface according to a preset mode; by adjusting the polarization regulation and control module and the light guide module, the motion direction, the motion speed and the stop position of the micro-nano particles are optically controlled. The optical control device comprises a control platform module, a laser emitting module, a light beam shaping module, a light guiding module, a polarization regulation and control module and an imaging monitoring module.

The invention discloses a light spot adjustable optical system, a diffraction optical module and laser processing equipment, and relates to the technical field of precision processing. The optical system comprises a laser, a beam expander, a diffractive optical module and a focusing module which are sequentially arranged in the light path direction, the diffractive optical module comprises at least one diffractive optical element, and the diffractive optical element is manufactured based on a geometric phase liquid crystal polymer birefringent material. The diffractive optical module is used for regulating and controlling light spot characteristic parameters corresponding to a Gaussian beam, the Gaussian beam is emitted by the laser and enters the diffractive optical module after being expanded and collimated by the beam expander, and the light spot characteristic parameters comprise a light spot distribution position and light spot energy intensity. By the adoption of the optical system, laser energy distribution can be optimized, splashing is effectively restrained, and the welding quality and the processing efficiency are improved.

This invention presents a frequency-domain fluorescence lifetime imaging system, enhancing capabilities with a spatial beam attenuator and pinhole beam splitter. The spatial beam attenuator reshapes any beam into a circular Gaussian beam profile, being compact, cost-effective, with low loss and back reflection. Using digital printing technology, a thin optical film is deposited onto an optical substrate for precise local attenuation of the beam in either transmission or reflection mode. The pinhole beam splitter consists of an optical beam splitter with an active region the size of a pinhole, positioned near the beam's focus, which directs focused light into two paths based on acceptance or rejection by the pinhole. This configuration allows for two detectors to collect photons from both paths concurrently, facilitating dual-mode imaging. Consequently, the system can generate both confocal and conventional non-confocal laser scanning fluorescence lifetime images of the sample at the same time.

The invention provides an unmanned aerial vehicle wireless energy supply method and system based on multiband laser and intelligent tracking and pointing, and relates to the technical field of unmanned aerial vehicle wireless energy transmission. The method comprises the following steps: dynamically selecting a 1064nm or 1550nm laser band according to a real-time distance between the unmanned aerial vehicle and a transmitting end, and shaping a Gaussian beam into a flat-topped beam through a variable-focus collimating lens group; a tracking and aiming mode combining coarse tracking and fine tracking is adopted, in fine tracking, through an infrared beacon and a CCD image servo closed loop, observation noise covariance is dynamically estimated in combination with a Transform-AKF fusion algorithm, and process noise covariance is adjusted in a self-adaptive mode; the offset of the reflection light spots is detected through the reverse reflector to realize jitter compensation; fusing the fine tracking angle and the jitter compensation amount to generate a final aiming instruction; meanwhile, according to energy feedback data and tracking errors of a receiving end, laser output power is adjusted in a self-adaptive mode through a PID algorithm. According to the invention, long-distance, high-precision and self-adaptive unmanned aerial vehicle wireless energy transmission is realized.

The invention discloses a laser cladding method for a wind power sliding bearing, and particularly relates to the technical field of laser cladding. The method comprises the following steps that a wind power gear box pin shaft is fixed to a positioner and adjusted to be axially horizontal, and a laser cladding head is positioned to the position above the central axis of the pin shaft through an industrial robot; laser cladding is conducted in a synchronous powder feeding mode, a cladding head is controlled to horizontally move in the axial direction, meanwhile, a positioner drives a pin shaft to rotate, and a spiral coating is formed on the surface of the pin shaft in a cladding mode; and after single-layer full covering is completed every time, the cladding head is moved reversely to conduct next-layer cladding, coating thickness accumulation is achieved through direction alternation and interlayer superposition, and the technology is terminated till the preset value is reached. By the adoption of the technical scheme, the problem that in the prior art, a sliding bearing is insufficient in friction and wear performance is solved, a flat-topped beam is adopted to replace a traditional Gaussian beam for cladding, the particle size of powder is refined, and the prepared coating has the advantages of being few in crack defect and good in friction and wear performance.

The invention belongs to the technical field of laser, and particularly discloses a beam shaping system and method based on prism pair orthogonality and cascade, and the system comprises a single-mode fiber, an aspherical lens, a first prism pair, a first parallel plate, a second prism pair and a second parallel plate which are sequentially arranged along the direction of an optical axis. A Gaussian beam emitted by a single-mode optical fiber is collimated by an aspherical lens to form a parallel beam, the beam is expanded or compressed in the X direction by a first prism pair, the beam is expanded in the Y direction by a second prism pair, and two inclined parallel plates are respectively used for compensating the beam offset in the X / Y direction; according to the invention, the circular Gaussian beam emitted by the single-mode fiber can be shaped, a large strip-shaped collimation light spot with an adjustable length-width ratio from 4: 1 to 20: 1 and a long axis size of 30mm can be realized, and the central positions of the input and output beams in the cross section are ensured to be unchanged.

The invention relates to a laser beam imaging method and system based on a bifocal optical system, and the method comprises the steps: enabling a first group of Laguerre-Gaussian beams with specified wavelength values to pass through the bifocal optical system, and recording a plurality of wavelength values and focus positions corresponding to the wavelength values; a focus prediction model is constructed and trained, and parameters of the focus prediction model are adjusted to meet preset requirements; predicting focus positions of the second group of light beams with specified wavelength values passing through the bifocal optical system through a focus prediction model, and constructing a mapping table of wavelength values and corresponding intersection point positions; obtaining a target imaging position, calculating a focus position based on the target imaging position, calling a mapping table based on the wavelength value and the corresponding intersection point position, and extracting the wavelength of the Laguerre-Gaussian beam corresponding to the focus position; and the Laguerre-Gaussian beam with the wavelength obtained through calculation is emitted, and an image of a target position is obtained through a bifocal optical system. According to the process, the adjusting efficiency is improved while the imaging quality of the bifocal optical system is improved.

According to the vector vortex beam generation method applied to the SERF magnetic field measurement device, a vector vortex beam is generated according to a light field distribution formula of the vortex beam in combination with a computer-generated holography method and a polarization mode decomposition method, then iterative optimization is carried out on parameters such as the phase, the amplitude and the polarization direction in the beam in a global NSGA-II algorithm and local SPGD algorithm combination mode, and finally the vector vortex beam is generated. And then judging whether the electron steady-state polarizability uniformity meets the expectation or not, if so, ending the optimization, taking the optimized light beam as a pumping light beam to pump alkali metal atoms, and carrying out subsequent magnetic field measurement, and if not, changing parameters and continuing optimization until the electron steady-state polarizability uniformity meets the expectation. Compared with a traditional Gaussian beam, the atomic polarizability in the air chamber is stabilized at a required value, the atomic spin gradient field of the device is effectively inhibited, the differential performance of the device is enhanced, and the sensitivity of the SERF magnetic field measurement device is improved.

This application provides a multi-parameter Gaussian beam inversion imaging method, apparatus, and device for acoustic VTI media, belonging to the field of seismic data processing technology. Based on normal time-difference correction velocity parameters, non-elliptic parameters, and Thomsen parameters, the pressure wave field control equation in the acoustic VTI medium is parameterized to obtain a migration operator. Based on the migration operator, the acquired actual seismic data is migrated to obtain actual migration imaging results. Based on the migration operator, the difference between the forward-modeled seismic data containing and without point scatterers is migrated to obtain a point spread function. The point spread function is spatially convolved with the initial perturbation parameter model to obtain simulated migration imaging results. Based on the actual and simulated migration imaging results, a first model loss is determined. The initial perturbation parameter model is iterated with the goal of minimizing the first model loss, improving the stability of imaging and parameter estimation in weakly illuminated areas.

The application discloses a three-piece Bessel beam shaping system with a diffraction ring, and belongs to the technical field of laser processing, comprising: a beam shaping mirror, a first collimating mirror and a focusing mirror; the incident surface and the exit surface of the beam shaping mirror are annular planes and annular aspheric surfaces respectively, and are used for shaping a collimated Gaussian beam into a point annular beam with energy gradually decreasing from inside to outside; the incident surface and the exit surface of the first collimating mirror are annular aspheric surfaces and annular planes respectively, and are used for collimating the point annular beam; the incident surface of the focusing mirror is a combination of an axicon surface and a spherical surface, and the exit surface is a plane; the focusing mirror is used for focusing the collimated point annular beam into a Bessel beam with a diffraction ring. The application can significantly improve the focal depth of the Bessel beam in laser processing, and can also effectively remove processing materials such as ink. In addition, the focal depth of the Bessel beam in the application is adjustable, and the adjustment mode is more, the flexibility is higher, and is suitable for different laser processing scenes.

The application provides a free space optical transmission system and simulation method based on a space-time non-diffracting light beam, and relates to the technical field of free space optical transmission.The system comprises a transmitting end configured to generate a laser light beam, modulate the laser light beam, perform collimation processing to form a Gaussian light beam, and convert the Gaussian light beam into a non-diffracting space-time light beam; and a receiving end configured to receive the non-diffracting space-time light beam, perform photoelectric conversion and signal restoration on the non-diffracting space-time light beam, and obtain original digital information; wherein the non-diffracting space-time light beam is a non-diffracting light beam with mutual correlation in time and space dimensions.The non-diffracting space-time light beam can reduce the influence of atmospheric turbulence, transceiver misalignment and limited aperture on a communication link, and effectively improve the transmission performance of the free space optical transmission system in a complex environment.

The invention discloses a free space optical communication system based on a structured optical frequency comb, and belongs to the field of optical communication. Comprising an optical frequency comb generation system, a signal coding system, a spatial light modulation and demodulation system and a signal receiving system. The optical frequency comb generation system is used for modulating input continuous laser into an adjustable optical frequency comb with high repetition frequency, short pulse width and high power; the signal coding system is used for separating the light with different wavelengths in the optical frequency comb, independently coding the light with each wavelength, and finally combining the light with different wavelengths again; the spatial light modulation and demodulation system is used for coupling the Gaussian beam in the optical fiber into a free space and converting the Gaussian beam into structured light, demodulating the structured light after the structured light is transmitted to a receiving end and re-coupling the structured light back to the optical fiber; the signal receiving system is used for receiving and analyzing the optical signals. According to the invention, the optical frequency comb and the structured light are combined, and the problem that optical signals are easily influenced by atmospheric turbulence in free space optical communication can be effectively solved on the premise of ensuring large communication capacity.

The invention relates to the technical field of image recognition and search, and discloses a surveying and mapping device capable of automatically searching a target, which comprises a base, surveying and mapping equipment is arranged at the top of the base, a searching mechanism is arranged at the top of the surveying and mapping equipment, the searching mechanism comprises a supporting block, and the supporting block is fixedly connected to the front side of the top of the surveying and mapping equipment. A semiconductor laser is installed on the left side of the supporting block, an emission lens is fixedly connected to the right side of the supporting block, and a fixing plate is fixedly connected to the right side of the top of the surveying and mapping device. According to the invention, the transmitting lens is matched with the transmitting cylindrical mirror, an elliptical Gaussian beam emitted by the semiconductor laser is converted into a fan-shaped line light source with uniform energy distribution by adopting a means of combining slow axis collimation and fast axis beam expansion, and a specified search angle is covered; the problems of non-uniform divergence of the infrared light source in the vertical direction and low light energy utilization rate in the prior art are avoided.

The invention provides a laser fuze emission beam-expanding optical lens in an extremely simple form, and the optical lens comprises an emission lens which is located at the rear end of the lens and is used for carrying out the small-angle compression shaping of a beam divergence angle of a meridian-direction Gaussian beam emitted by a laser; and the wave mirror is positioned at the front end of the lens and is used for carrying out large-angle beam expansion on the beam divergence angle of the Gaussian beam emitted by the laser in the sagittal direction and realizing uniform shaping of light spots. Strip-shaped distribution shaping is carried out on Gaussian beams of the laser through the extremely simple form of the two lenses, so that the light beam emergent view field in one direction, namely the meridian direction, is compressed to 1 degree, and the light beam emergent view field in the other vertical direction, namely the sagittal direction, is expanded to 90 degrees. By adopting the special element design of the cylindrical surface array, the uniform energy distribution of the whole strip-shaped light spot is realized, the target detection precision of the surface-air laser fuze in a large-range space region is greatly improved, and meanwhile, the extremely simple design is more beneficial to meeting the requirements of miniaturization and low cost.

Methods and devices relating to volumetric meta-optic structures. A method involves computationally designing a three-dimensional refractive index profile using an adjoint-based optimization process. The process optimizes for sorting light based on wavelength or polarization at specific oblique incidence angles and accounts for source divergence using Gaussian beam simulations. A mode overlap figure of merit is employed, optionally including terms to minimize crosstalk. Fabrication constraints like material binarization and minimum feature size are handled via differentiable filters. Physical crosstalk barriers may optionally be modeled during optimization. The resulting optimized profile defines a manufacturable multi-layer structure comprising patterned dielectric materials configured to perform the target sorting function efficiently under the specified oblique angle conditions. An array of such devices, potentially comprising structurally distinct elements optimized for different angles, can be integrated with an image sensor.

The embodiment of the invention provides a beam decomposition method for electromagnetic acceleration calculation of an electrically large-sized target, and the method comprises the steps: 1, obtaining a sampling data file, and converting the related parameter information when a read antenna pattern is represented by a uniform sampling grid into a data organization form capable of carrying out query processing; 2, performing uniform sampling on a spherical surface through a gold spiral method, and determining a sub-beam center; 3, limiting a Gaussian beam edge amplitude attenuation threshold value, calculating a beam variance as a limiting condition, and controlling the shape width of the Gaussian beam to be used; and 4, completing high-fidelity beam decomposition of the directional diagram by adopting local convolution, amplitude alignment and phase cloning operation, and ensuring that each sub-beam strictly inherits original field characteristics. According to the method, distributed parallel computing of a complex scattering problem is realized through a conical beam decomposition and region mapping mechanism, and the computing efficiency is remarkably improved while the computing precision is ensured.

The present invention provides a filamentation cutting head, a laser cutting system and a design method for a filamentation cutting head, which relate to the field of laser control technology. The filamentation cutting head includes a shaping element, a collimating element and a focusing element arranged in sequence along the propagation direction of light. The laser beam emitted by the laser is converted into a flat-top beam by a shaping element having a first surface shape, and its divergence angle is controlled by the collimation of the collimating element. Finally, it is converged into a target filamentation beam with high energy utilization and high uniformity by a focusing element having a second surface shape. This filamentation beam can realize laser cutting of hard and brittle materials and improve the processing effect. At the same time, the filamentation cutting head adopts a full-refractive element, which not only has the advantages of a simple design method, low lens processing difficulty, and the ability to cope with a variety of materials, but can also convert all Gaussian beams into flat-top beams, so that all input energy is utilized in the filamentation beam.

The invention relates to a three-wavelength light emitter based on a binary optical lens. The three-wavelength light emitter comprises a first laser chip used for generating a first Gaussian beam; the second laser chip is used for generating a second Gaussian beam; the third laser chip is used for generating a third Gaussian beam; the first binary optical lens is used for diffracting the first Gaussian beam and then obliquely irradiating the diffracted first Gaussian beam to a first position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the second binary optical lens is used for diffracting a second Gaussian beam and then directly irradiating the diffracted second Gaussian beam to a second position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the third binary optical lens is used for diffracting a third Gaussian beam and then obliquely irradiating the diffracted third Gaussian beam to a third position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the first position point, the second position point and the third position point are respectively located at different positions of the end face of the receiving end of the planar waveguide bridging single-mode fiber; according to the invention, the optical path structure of the 50G PON optical device is simplified, and the production cost and working hours of the 50G PON optical device are saved.

The invention relates to the technical field of lasers, in particular to a multi-wavelength coaxial line polarization homogenization laser system which comprises a laser light source, a collimation module, a coaxial beam combination module and a homogenization module. The laser light source is used for outputting a plurality of linearly polarized lasers; the collimation module is used for matching the laser spot to collimated laser with a target size; the coaxial beam combining module is used for integrating the multi-wavelength laser to the same light path and enabling the coaxiality to be smaller than or equal to 0.01 mrad; the homogenizing module comprises an aspheric lens, an aspheric mirror, a concave-convex lens and a biconvex lens, the aspheric lens is used for expanding the light beams, and the aspheric mirror, the concave-convex lens and the biconvex lens are used for converting the Gaussian light beams into uniform flat-topped light beams, so that the homogenizing module eliminates multi-wavelength dispersion and outputs coaxial laser beams with the light intensity uniformity larger than or equal to 90%. According to the multi-wavelength coaxial line polarization homogenization laser system, the multi-wavelength coaxiality and the light intensity uniformity can be improved, and meanwhile, the complexity of the laser system is reduced.

The invention discloses a laser double-beam interference micropore machining phase modulation method which comprises the following steps: respectively emitting two Gaussian beams, and respectively modulating and compounding phases to obtain vortex Bessel beams; respectively adjusting the pulse sequences of the two Gaussian beams into a pre-pulse and a main pulse which are connected into a whole and have different energy; respectively carrying out polarization treatment on the two Gaussian beams to obtain two energy brushes which reversely rotate around the outer surface of the circumference of the vortex Bessel beam to clean chips; s2, monitoring the difference between the micropore depth and the target hole depth in real time, and continuously adding additional phase offset to the composite phase in S1; the long focal depth characteristic of the Bessel beam and the annular energy distribution of the vortex beam are combined, the focal depth range is expanded, meanwhile, laser energy is dispersed to the circumferential area from the center point, the peak power density is reduced, the heat dissipation condition is improved, the problem of insufficient focal depth is effectively solved, and feature offset caused by heat accumulation is synchronously restrained.

The invention discloses a waist-adjustable structure-integrated square elbow of a DNP-NMR (Dynamic Nuclear Polarization Nuclear Magnetic Resonance) system transmission line. The waist-adjustable structure-integrated square elbow structurally comprises two corrugated waveguide structures, a right triangle cavity, a metal ellipsoid mirror surface and two external flange structures. The square elbow is installed in a transmission line, and the corrugated waveguide receives an HE11 mode coupled by a Gaussian fundamental mode from a gyrotron, so that long-distance transmission with small loss and low cross polarization is realized in a transmission line system; the right triangle cavity is connected with the two ends of the corrugated waveguide, an HE11 mode transmitted in the corrugated waveguide is recoupled into a Gaussian base mode at the position, the transmission direction of a wave beam is changed through the metal ellipsoid mirror surface, and the space flexibility of the transmission device is improved. Meanwhile, the metal ellipsoid mirror surface also adjusts the waist radius of the Gaussian fundamental mode so as to match the input requirement of the nuclear magnetic resonance system and keep the phase consistency of the original wave beam at the same time; the external flange structure is used for being tightly connected with other straight waveguide sections, and continuity and collimation of the cavity structure are guaranteed. Compared with a split type part, the integrated square elbow has the advantages that the assembly error of a construction system is obviously reduced, the machining difficulty is low, and the standardization degree is high. And meanwhile, the device can meet the requirements of a dynamic nuclear polarization nuclear magnetic resonance system on high-efficiency, stable, flexible-direction and long-distance transmission of Gaussian beams.

The invention discloses a laser illumination and imaging lens group for a shadow imaging system, the laser illumination and imaging lens group comprises an illumination lens and an imaging lens, the illumination lens shapes a Gaussian beam into a flat-topped beam, and the flat-topped beam uniformly irradiates an object to be observed; the imaging lens images the target area to obtain a shadow contour image of the observed object. The illumination lens comprises a first lens with negative focal power and a second lens with positive focal power, and the first lens and the second lens are both aspheric lenses. The imaging lens comprises a front lens group, an aperture diaphragm and a rear lens group, the front lens group comprises a third lens, a fourth lens, a seventh lens and an eighth lens with positive focal power, and a fifth lens and a sixth lens with negative focal power, and the rear lens group comprises a ninth lens with negative focal power and a tenth lens with positive focal power. And all the lenses are spherical lenses. While the collimation and dodging effects of the laser beams are ensured, the system also has the advantages of long working distance, high resolution and the like, can meet the observation requirements of a non-luminous high-speed small-size moving object, and expands the application field of a shadow imaging system.

An apodization grating coupler based on a thin film lithium niobate platform comprises a silicon substrate, a buried silicon oxide layer, a thin film lithium niobate layer and a silicon oxide cladding which are sequentially arranged from bottom to top, and an end face coupler, a thin film lithium niobate waveguide, a light beam expander and an apodization grating are sequentially arranged in the thin film lithium niobate layer. The end face coupler couples light of the conical optical fiber into the thin film lithium niobate waveguide, and after the light is input into the apodization grating through the light beam expander, large-beam-waist Gaussian light beams are coupled through diffraction of the apodization grating. On the basis of the large-size apodization grating, through a compact plane photon structure, the 700 nm * 300 nm lithium niobate high-refractive-index single-mode waveguide can be coupled to a near-surface normal Gaussian beam with a beam waist of about 110 m and good collimation, the diffraction angle is 10 degrees, centimeter-level propagation is achieved in a free space, and the loss is 5.6 dB.

The present application belongs to the field of terahertz imaging and image processing, and particularly relates to a terahertz image data expansion method based on a space-frequency degradation model. The method mainly comprises the following steps: pre-screening and pre-processing a high-resolution image database to establish a high-resolution image library; simulating a terahertz Gaussian beam to perform fuzzy degradation processing on the high-resolution image using a Gaussian fuzzy kernel; simulating terahertz wave source fluctuation and sensor noise to add Gaussian noise; simulating low resolution of terahertz imaging, and reducing the image resolution using a bicubic downsampling method; simulating mutual interference of multiple terahertz waves during imaging, and using a scheme of adding a frequency domain mask to change the frequency domain features; simulating the case that low image contrast is caused by low terahertz wave source power, and using a gray scale compression method to compress the gray scale histogram of the image to obtain a final low-resolution image data set. The present application can effectively expand the super-resolution training set of terahertz images, thereby improving the training effect of the terahertz image super-resolution reconstruction task based on the deep learning method.

The invention relates to the technical field of forward wave oscillators, in particular to a K-band TE11 mode microwave oscillator. Comprising a cylindrical waveguide, and sequentially comprises a cut-off transition section, an interaction section and an output transition section, the cathode structure is mounted in the cut-off transition section; the anode waveguide structure comprises a plurality of slotted circular ring metamaterial units which are arranged in the interaction section at intervals in the axial direction, are linked through a metal cylinder to form a serial structure and are connected to the wall of the cylindrical waveguide to form a double-spiral anode slow wave structure; electron beams generated by the cathode structure rotate in the axial direction under the action of an external electromagnetic field, interact with each other in the anode slow wave structure to excite forward waves in a TE11 mode, and radiate outwards along an output transition section; the collector is arranged in the output transition section. On the basis of realizing a Gaussian beam TE11 mode, a traditional mode conversion structure is omitted, the structure is more compact, and light weight and miniaturization are easy to realize.

The application discloses a multi-mode vortex laser with adjustable order, comprising: a cavity lens coated with a laser wavelength anti-reflection film system, a first laser output mirror and a second laser output mirror, both of which are plane mirrors, and both of which are coated with a film system partially transmitting laser wavelength on one side and an anti-reflection film system for laser wavelength on the other side; a high-order Laguerre-Gaussian beam is focused by the cavity lens, and the focused beam waist positions of each-order Laguerre-Gaussian mode vortex light are separated under the action of spherical aberration of the cavity lens, and the higher the mode order and the larger the spot size, the closer the focused beam waist of the mode to the cavity lens; the positions of the first laser output mirror and the second laser output mirror are adjusted so as to be located at the waist positions of a certain mode, and the first laser output mirror and the second laser output mirror located at different positions provide feedback for two different-order Laguerre-Gaussian mode vortex lights, so that multi-mode vortex laser oscillation and output are formed.

The application discloses a well control seismic fast migration imaging method, which comprises beam synthesis, beam propagation and beam imaging, and specifically comprises the following steps: (1) in the synthesis of the beam, first, the position of the local event is identified at the center position of the super-gather, then, the beam synthesis is completed by stacking along the slope direction of the event, and the seismic record is reversely calculated through the synthesized beam, and compared with the actual seismic record to perform quality control; (2) in the beam propagation, first, the ray tracing is performed along the corresponding slope direction from the shot point and the geophone position, then, the position of the imaging point is determined through the space and time criteria; (3) after the position of the imaging point of the beam is determined, the beam is unfolded around the imaging point according to the real part and the imaginary part of the Gaussian beam, and the beam imaging is performed. The application combines the imaging ability of the Gaussian beam migration and the imaging effect and the calculation efficiency of the fast migration while drilling based on the Gaussian beam are improved under the premise of well control.