98 results about "Liquid crystal spatial light modulator" patented technology

The invention discloses a femtosecond laser etching method and system for a perovskite thin film, and relates to the technical field of semiconductor processing, and the system comprises a laser light source module which is used for generating a femtosecond laser pulse which is high in repetition rate and adjustable in laser power, frequency and beam spread angle; the optical path control module is provided with an optical element group, an optical element alignment system, a beam shaper and a self-adaptive optical element, and is used for adjusting the path, focusing and energy distribution of the laser beam; wherein the adaptive optical element comprises an adjustable deformable mirror and a liquid crystal spatial light modulator. According to the femtosecond laser etching method and system for the perovskite thin film, by combining real-time wavefront monitoring, distortion correction and an optical element driving system, the stability and consistency of an optical path are ensured, and the problem that etching consistency and uniformity are difficult to maintain on a large-area thin film through a traditional etching method is solved; and the performance of the device is unstable and reduced.

The invention relates to laser communication, in particular to a non-rotating type space laser communication system and method based on a liquid crystal phase regulation and control device, and aims to overcome the defects that in the prior art, a liquid crystal spatial light modulator is small in deflection angle and small in transmitting and receiving aperture, and the requirements for the capturing and tracking range and aperture of space laser communication are difficult to meet. The non-rotation type space laser communication system based on the liquid crystal phase regulation and control device comprises an adjustable phase delayer, a liquid crystal polarization grating module, a beam shrinking module, a liquid crystal space light modulator, a fine tracking galvanometer, a light splitting module, a coarse tracking module, a fine tracking module, a communication module and a data processing module, according to the communication method based on the system, light beam deflection is carried out through the adjustable phase delayer, the liquid crystal polarization grating module, the liquid crystal spatial light modulator and the fine tracking galvanometer, a traditional mechanical rotary table is replaced, and high-precision adjustment is achieved.

The invention discloses a light spot shaping device based on wave plate polarization conversion and a use method, and relates to the technical field of laser processing, the device divides random polarized light into S / P light through a first polarization beam splitter (PBS), converts the S light into P light through a first 1 / 2 wave plate, modulates the S light through a conventional silicon-based liquid crystal spatial light modulator (LCoS SLM), and converts the P light into the S light through a second 1 / 2 wave plate. And the beams are combined by the second PBS. The method comprises the steps of light splitting, polarization conversion, phase modulation, beam combining, beam expanding and focusing and the like. The double 1 / 2 wave plates are combined with the conventional PBS, the laser energy utilization rate is higher than 85%, commercial SLM equipment is adapted, the machining efficiency of the shaped annular light spots is remarkably improved compared with that of Gaussian beams, the method is suitable for laser welding and metal 3D printing, and the problems of energy waste and high cost are solved.

The invention provides a scanning-type single-photon laser radar system based on phase regulation, and the system employs a reflection-type liquid crystal spatial light modulator to carry out the phase regulation of a laser beam, and achieves the long-distance fixed-point focusing through the modulation of laser wavefront. And echo signal detection is carried out by using a single-photon detector. Before the reflection type liquid crystal spatial light modulator is used for carrying out phase regulation and control on a laser beam, the laser beam is divided into reference light and detection light through the light splitting module, and then the divergence angle of the laser beam is reduced through the beam expanding module; after phase regulation and control, scanning of a laser beam in a target area is controlled through a reflector and a two-dimensional scanning galvanometer.

The invention provides an optical cross system based on silicon-based liquid crystal and a control method, and relates to the field of optical elements, and the optical cross system comprises an optical fiber array, a micro lens array, a collimating lens, a polarization conversion module, a dispersion element, a focus lens group and a liquid crystal spatial light modulator. Optical signals are coupled through the micro-lens array, a divergence angle is compressed, and parallel light beams are formed through the double-agglutination collimating lens; the polarization conversion module separates the light beam into P / S polarized light and unifies the polarization state; the dispersion element separates light beams according to wavelength space, and the focus lens group forms an elliptical Gaussian light spot on the liquid crystal spatial light modulator; the liquid crystal spatial light modulator divides a light spot into a plurality of independent control areas in the long-axis direction, and single-wavelength multi-port output, power proportion regulation and control and monitoring signal extraction are achieved by dynamically modulating the reflection phase of each area. The control method comprises the steps of optical path processing, regionalized phase modulation and real-time monitoring feedback. According to the invention, flexible routing, power balance and lossless monitoring of wavelength channels can be realized.

The invention discloses a super-resolution microscopic interference measurement method based on broadband annular radial polarized light, which comprises the following steps of: selecting a broadband spectrum extended surface light source, providing uniform illumination covering a field of view to be measured and having a certain aperture angle by adopting a Kohler illumination system, and designing a two-stage relay system, amplitude and polarization modulation of the full-view-field light beam is realized through the liquid crystal spatial light modulator and the vortex wave plate; the expanded surface light source and the large-numerical-aperture microscope objective are combined to focus broadband annular radial polarized light, so that super-resolution microscopic interference imaging of the sample is realized; the super-resolution morphology measurement of the microstructure surface is realized in combination with a phase shift coherent method, the problem of low efficiency caused by traditional laser spot scanning is solved, the transverse resolution limitation of traditional microscopic interference morphology measurement is broken through, and the morphology resolution of traditional microscopic interference measurement is improved.

The utility model relates to the field of laser processing, in particular to a novel silicon-based liquid crystal spatial light modulator, which is characterized by sequentially comprising a complementary metal oxide semiconductor (CMOS) silicon-based back plate (100), a central symmetry aluminum pixel electrode layer (101), a medium reflecting layer (102), a lower orientation layer (103), a liquid crystal molecular layer (104), an upper orientation layer (105), an indium tin oxide (ITO) electrode layer (106), a glass substrate (107) and an anti-reflecting layer (108) from bottom to top. According to the utility model, the reflectivity, the diffraction efficiency and the phase flatness of the silicon-based liquid crystal spatial light modulation device are improved, the electric field is uniformly distributed, the fringe field effect is reduced, the switching speed of phase modulation is effectively improved, the laser processing efficiency and quality are greatly improved, and more laser processing modes are realized. The technical scheme provided by the utility model can be applied to multiple fields of invisible cutting, laser marking, laser welding and the like.

The invention provides a liquid crystal optical phased array imaging system and a design method thereof, and belongs to the technical field of liquid crystal optical phased arrays. The system comprises a camera, a lens, a beam splitter prism, a liquid crystal spatial light modulator, a super lens and a computer, and is suitable for a visible light band. Non-mechanical light beam deflection is achieved through the liquid crystal spatial light modulator, angle amplification and dispersion compensation functions are achieved in combination with the super lens, and the problems that a traditional mechanical light beam deflection technology is large in size and short in service life are solved, and the problems that an existing liquid crystal optical phased array is small in angle range and imaging aliasing is caused by dispersion are solved; the superlens adopts a three-layer nanostructure unit stacking design, the upper layer is a dispersion compensation structure, the lower layer is an angle amplification structure, and large-angle imaging and efficient spectrum utilization are realized through phase modulation; the invention has the advantages of compact structure, small volume, low cost, high stability and the like, and is suitable for the fields of laser radar, space optical communication, infrared tracking and the like.

A super-resolution microscopic imaging method and apparatus based on common-path parallel fluorescence emission difference microscopy. In the method, a liquid crystal spatial light modulator is used to modulate excitation light in fluorescence emission difference microscopy super-resolution microscopic imaging, and two parts of the spatial light modulator are respectively loaded into 0-2π vortex phase modulation and blazed grating, so that the common-path excitation light forms solid spot and doughnut-shaped spot with a certain distance on a sample surface at the same time, and parallel scanning is carried out, thereby ensuring that the imaging speed is doubled compared with that of ordinary fluorescence emission difference super-resolution microscopic imaging, and at the same time, the two excitation lights are not easily affected by noise, drift and other interferences due to the common path.

The application relates to the technical field of photographic light source control, and discloses a soft light control method and a mobile terminal, wherein the soft light control method comprises the following steps: constructing a four-dimensional light field harmonic model, decomposing a target light effect into a time-space harmonic combination; decomposing the target light effect into a time-space mapping sequence to form light field microstructure control parameters; combining a micro-electro-mechanical system programmable reflection array and a liquid crystal spatial light modulator, cooperating with a multi-channel LED array to realize sub-millimeter light distribution control and microsecond light field dynamic reconstruction; establishing an accurate synchronization mechanism of a shooting device shutter and light effect change; providing a light effect animation programming interface based on key frames, supporting the definition of a dynamic change sequence of light trajectory, intensity and form; and through the fusion of microstructure light field control and time-space harmonic analysis, four-dimensional dynamic light sculpture is realized, and the technical problem that a traditional soft light control method can only adjust overall brightness and color temperature is solved.

The present invention relates to the field of spintronic technologies, and discloses an optical method for dynamically regulating the propagation direction of spin waves. Based on the excitation of spin waves by an ultrashort laser pulse, a liquid crystal spatial light modulator is used to dynamically shape the excitation light field, modulate the amplitude and phase of the excitation light field, obtain an arbitrarily controllable pulsed excitation light field distribution on the surface of a magnetic medium, and further generate a desired instantaneous spin wave source field, thereby realizing the dynamic regulation of the propagation direction of spin waves. This method can be controlled by a computer and has the advantages of flexibility, real-time performance, programmability, etc.

The present invention relates to a laser three-dimensional imaging simulator, which belongs to the field of three-dimensional imaging simulators and is used to solve the defect that the existing technology cannot flexibly adjust the simulation distance. The laser three-dimensional imaging simulator includes a laser, a fiber array coupler, a fiber array composed of fiber bundles with increasing lengths, a liquid crystal spatial light modulator, a spatial filtering optical system, a pinhole diaphragm arranged on the focal plane of the spatial filtering optical system, and a test system, wherein the light beam emitted by the laser is collimated and projected to the fiber array coupler, and then decomposed and enters the fiber array; the output light of the fiber array is collimated and projected to the liquid crystal spatial light modulator; among the light beams output by the liquid crystal spatial light modulator, the light beam passing through the pinhole diaphragm is collimated and projected to the test system. One application of the present invention is the design and manufacture of a laser three-dimensional imaging simulator.

The invention provides an integratable wide spectrum dense channel WSS based on a liquid crystal spatial light modulator, and the method comprises the steps: taking an axial symmetry AWG array as an input port / output port of the WSS, carrying out the dispersion of an input WDM signal, and carrying out the wave combination of an output optical signal; the polarization control module is used for converting the WDM signal into two beams of linearly polarized light in a single polarization state; the grating is used for dispersing linearly polarized light in the WDM signal along the x direction; the lens group is used for realizing polarization multiplexing in an x-z plane, converting offset of different angles into off-axis displacement to realize angle-space displacement conversion, and controlling the spot size through a 1: 1 4f system in a y-z plane; the spatial light modulator is used for carrying out pure phase wavefront modulation on optical signals, so that light with different wavelengths deflects at different angles in the x direction and returns along the same path in the y direction, and the problem that it is difficult for a WSS of a liquid crystal spatial light modulator to simultaneously achieve a wide working frequency spectrum covering a communication waveband and ultra-dense channel intervals lower than 50 GHz is solved.

The invention discloses a method and device for modulating random polarized light through a liquid crystal spatial light modulator, and relates to the technical field of light field regulation and control. The device comprises a laser, a two-in-one optical fiber, a beam expander, a polarization beam splitter (PBS), a 1 / 2 wave plate, an optical fiber coupler, a polarization maintaining optical fiber, a liquid crystal spatial light modulator and other core components, wherein the liquid crystal spatial light modulator is reflective or transmissive. According to the method, random polarized light is divided into parallel and vertical polarized light components through a PBS, the vertical polarized light is converted by a 45-degree 1 / 2 wave plate and then is transmitted by a polarization maintaining optical fiber and is converged with the original parallel polarized light component, or the vertical polarized light is directly used for preheating a sample to be processed, and the converged single beam of parallel polarized light is modulated by a liquid crystal spatial light modulator. Single-beam modulation is achieved, high-power large light spot application is adapted, the hologram manufacturing difficulty is lowered, the light path structure is simplified, light energy loss is reduced, and the device is suitable for 3D metal printing, laser welding and other scenes.

The utility model discloses a picosecond square wave amplification system based on a photonic crystal fiber, which is characterized by comprising an oscillator used for outputting a laser pulse; the isolator is used for preventing the seed light from being fed back into the oscillator; the stretcher is coupled to the oscillator and is used for expanding the pulse width of the laser pulse output by the oscillator; the pulse shaping device is used for processing the laser pulse, the pre-amplifier is used for amplifying the average power of the laser pulse processed by the stretcher, the pulse shaping device comprises a 4f amplitude modulation system based on a liquid crystal spatial light modulator (SLM), and the 4f amplitude modulation system comprises a grating G1, a grating G2, a concave mirror M1, a concave mirror M2 and the liquid crystal spatial light modulator. The utility model relates to the technical field of laser amplification systems, and the system can realize real-time and controllable pulse amplitude shaping of ultrashort laser pulses through a liquid crystal spatial light modulator so as to obtain pulses with specific shapes, such as square wave pulses.

The invention discloses a complex amplitude light field regulation and control device and a use method thereof, and relates to the technical field of spatial light modulation.The complex amplitude light field regulation and control device comprises a first transmission-type modulation device which is provided with a sandwich multilayer structure composed of an upper glass substrate, a liquid crystal layer and a pixel electrode, and the upper surface and the lower surface of the first transmission-type modulation device are provided with an upper surface polaroid and a lower surface polaroid respectively; the polarization direction of the upper surface polaroid is consistent with the polarization direction of incident light, and the polarization direction of the lower surface polaroid is perpendicular to the polarization direction of the incident light. According to the invention, through effective combination of a transmission-type modulation device and a reflection-type modulation device, the liquid crystal spatial light modulator is used for fine regulation and control of light beams, and multi-degree-of-freedom and high-precision modulation of amplitude, phase, polarization and the like is carried out on an incident light field, so that the light field regulation and control mode is greatly improved, and the hologram calculation iteration time is reduced; the method can be applied to multiple fields of holographic display, all-optical communication, laser processing and the like.

The invention discloses an optical phased array transmitting system based on end face emergence. The optical phased array transmitting system comprises an antenna array composed of tip Si waveguides and a concave reflector based on a liquid crystal spatial light modulator. An SOI substrate in the antenna array comprises a substrate silicon layer and a buried oxide layer, a Si waveguide layer is located above the buried oxide layer and used for transmitting a light field, and the upper layer is covered with SiO2; similar cylindrical Fresnel lens phase distribution is applied to the LCOS-SLM liquid crystal spatial light modulator, so that the condensation performance similar to that of a cylindrical concave reflector is formed, and the longitudinal divergence angle of an emergent beam is reduced. Tip processing is carried out on the tail end of the Si waveguide, the emission efficiency is improved by introducing gradual change of the effective refractive index, meanwhile, an end face emission optical phased array antenna array is formed, the transverse light beam scanning capacity is achieved, deflection of different degrees is generated based on the main optical axis of the concave reflector, the longitudinal angle of reflected light is changed, and the reflection efficiency is improved. Therefore, the longitudinal scanning of the light beam is realized.

The present invention provides a pixel-level full-vector, full-range polarization control device, comprising: an aperture, a radial polarization converter, a first phase-type liquid crystal spatial light modulator, a second phase-type liquid crystal spatial light modulator, a PC control terminal, a converging lens, and a polarization camera. Specifically, the aperture, the radial polarization converter, the first phase-type liquid crystal spatial light modulator, the second phase-type liquid crystal spatial light modulator, the converging lens, and the polarization camera are arranged in sequence along the horizontal direction and share a common rotational symmetry axis. The present invention relates to the technical field of vector light beam polarization control. The pixel-level full-vector, full-range polarization control device of the present invention can achieve full-range polarization control of the ellipticity angle [‑π / 4, π / 4] and the azimuth angle [‑π / 2, π / 2] for light incident in any polarization state.

There is disclosed herein a liquid crystal on silicon spatial light modulator, “LCoS SLM”, device arranged for in-plane switching. The LCoS SLM device comprises: a silicon backplane (1501); a transparent substrate (1581); a liquid crystal layer (1571); an electrode structure (1505, 1507) and a reflective component (1561, 1551). The liquid crystal layer (1571) is interposed between the silicon backplane (1501) and the transparent substrate (1581). The electrode structure (1505, 1507) is formed on the silicon backplane (1501) for generating an electric field in the liquid crystal layer (1571). The electric field is substantially parallel to the silicon backplane (1501). The reflective component (1551, 1561) is opposing the transparent substrate (1581).

The invention discloses a topological texture adjustable optical skyrmion generation method and system. The method and the system comprise two core components, namely a liquid crystal spatial light modulator and a variable phase delayer, and a linear polarization fundamental mode Gaussian beam can be regulated and controlled into a topological texture customizable Gaussian beam by adjusting the holographic phase of the liquid crystal spatial light modulator and the control voltage of the variable phase delayer. The topological texture adjustable generation of the optical skyrmion is realized. The system is high in energy utilization rate, high in response speed, rich in topological texture, simple and stable in structure and easy to adjust, and can be widely applied to frontier application scenes such as free space laser communication.

A measuring device and method for perfect vortex light with a large topological charge value. The device includes a laser, and successively along the laser output direction of the laser are a beam expander, a linear polarizer, a first reflector, a second reflector, a reflective pure-phase liquid crystal spatial light modulator, a plano-convex cylindrical lens, a Fourier lens, a diaphragm, and a CCD camera. The control end of the reflective pure-phase liquid crystal spatial light modulator is connected to a first PC control end, the control end of the CCD camera is connected to a second PC control end, the CCD camera is placed at the focal plane of the Fourier lens, and the plano-convex cylindrical lens is located at any position between the reflective pure-phase liquid crystal spatial light modulator and the Fourier lens. The present invention can measure the topological charge value range of perfect vortex light to be relatively large, and can measure perfect vortex light with different base angle parameters. The optical path of the present invention is simple and has strong flexibility. The position and angle of the plano-convex cylindrical lens are both adjustable, and the operation is extremely convenient, and it can be applied to the detection of perfect vortex light with a large topological charge number.

The present invention discloses a method for analyzing polarized image information, a system, an electronic device, and a computer-readable storage medium. These methods, which fall within the field of optics, primarily target materials exhibiting birefringence. By comprehensively considering all factors, including the light source, material absorption / emission, birefringence, and the provision of additional optical path difference devices in the optical path, the method reproduces the sample's color and texture, revealing the material's optical properties and molecular arrangement characteristics. These methods, including optical index, birefringence, color, and molecular director distribution, provide quantitative analysis tools for polymer crystallization / orientation, liquid crystal texture analysis, and biofilm analysis. These methods can be applied to material microstructure and performance studies, including analysis of color distortion caused by design flaws in liquid crystal displays, liquid crystal spatial light modulators, and active-matrix organic light-emitting diode displays. Furthermore, in the production of polymer materials using stretching processes, this method can also monitor and analyze properties such as the order parameter and birefringence of oriented polymers in real time.

The application provides a laser communication scanning precision improving method, which comprises the following steps: before using a liquid crystal spatial light modulator, calibrating and adjusting the liquid crystal spatial light modulator in a simulated use environment to obtain a mapping relationship between a deflection angle error of the liquid crystal spatial light modulator in the use environment and a compensation parameter; reflecting a laser beam by using the liquid crystal spatial light modulator to form a first light beam; splitting the first light beam by using a beam splitting block to form a second light beam reflected in the beam splitting block and a third light beam transmitted through the beam splitting block; reflecting the third light beam to the beam splitting block by using a corner cube and reflecting the third light beam by the beam splitting block to form a fourth light beam; processing the fourth light beam by using a coupling mirror group and collecting the fourth light beam by using a camera to determine the deflection angle of the fourth light beam in real time and control the deflection angle of the second light beam. The application can control the deflection direction of the liquid crystal spatial light modulator in real time and improve the scanning precision of the laser communication.

The invention discloses a multi-focus array light intensity regulation and control method for a liquid crystal spatial light modulator, and relates to the technical field of light field regulation and control. Comprising the following steps: dividing an entrance pupil area into a plurality of fan-shaped areas by taking an entrance pupil center of an objective lens as a vertex, and endowing specific phase values for the fan-shaped areas to obtain a multi-focus phase diagram; the multi-focus phase diagram is loaded on a spatial light modulator for phase modulation, and after entrance pupil phase coding is carried out on an objective lens, a multi-focus array is obtained on a focal plane; calibrating the relationship between the central angle of the phase segmentation region and the light intensity distribution for the multi-focus array by using an image processing method; adjusting the central angle parameter of the phase segmentation region according to the relationship between the central angle of the phase segmentation region and the light intensity distribution, and controlling the light intensity distribution of the multi-focus array; and setting corresponding phase distribution to obtain a multi-focus array with light intensity distribution, focus position and morphology control. According to the method, the light intensity distribution control calculation of the multi-focus array is efficient, and the multi-focus array with controllable intensity, position and morphology can be obtained.

Disclosed in this disclosure is a method for super-resolution microscopic interferometric measurement based on broadband annular radially polarized light, where a broad-spectrum light source with an extended surface is selected; uniform illumination covering a to-be-tested FOV and having a certain aperture angle is provided using a Kohler illumination system; a two-stage relay system is designed, and amplitude and polarization of a full-FOV beam is modulated by a liquid crystal spatial light modulator and a vortex waveplate; broadband annular radially polarized light is focused based on the extended surface light source and a microscopic objective lens with a high numerical aperture to implement super-resolution microscopic interference imaging of a sample; and super-resolution topography measurement directed at a surface of a microstructure is implemented combined with phase-shifting interferometry.

The application provides a high-speed three-dimensional reconstruction system and method based on two-stage cooperative coding, which comprises a parallel light source module, a liquid crystal spatial light modulator, a 4f relay system, a digital micromirror device, a projection lens, a sparse light field sampling module and an edge computing device; parallel light beams output by the parallel light source module are transmitted to the digital micromirror device for high-speed binary processing through the 4f relay system after phase modulation, so that a structured light field modulated in phase and amplitude is formed; the projection lens projects the modulated light field to a measured surface of a workpiece, and the reflected light field of the workpiece is captured by the sparse sampling module and then compressed; the edge computing device dynamically adjusts parameters of the liquid crystal spatial light modulator, the digital micromirror device and the sparse light field sampling module according to real-time feedback, so as to optimize the adaptability of the structured light field to the surface characteristics; finally, the surface topography is accurately reconstructed through a three-dimensional reconstruction network, and the core problem that speed, precision and data volume cannot be simultaneously achieved is solved.

The application discloses a vortex spectrum dark field microscopic measurement device and method based on vortex quantum correlation, which comprises an entangled light source generation module, a sample illumination detection module and a vortex spectrum extraction module; the entangled light source generation module sequentially comprises a laser, a half-wave plate, a BBO crystal, a low-pass filter and a non-polarization beam splitter one in the light propagation direction; the sample illumination detection module sequentially comprises a single-mode optical fiber one, a tube lens one, an objective lens one, a sample to be measured, an objective lens two, a tube lens two, a lens one, a lens two, a single-mode optical fiber two and a SPAD detector one in the light propagation direction; and the vortex spectrum extraction module sequentially comprises a mirror one, a mirror two, a liquid crystal spatial light modulator one, a lens three, a lens four, a single-mode optical fiber three and a SPAD detector two in the light propagation direction.

The invention discloses a terahertz liquid crystal spatial light modulator with large modulation depth and ultra wide band, which belongs to the field of novel artificial electromagnetic materials and terahertz science and comprises an upper-layer quartz substrate, an upper-layer metal grating, an upper-layer pre-oriented film, a liquid crystal layer, a lower-layer pre-oriented film, a lower-layer metal grating and a lower-layer quartz substrate which are sequentially stacked and arranged, the upper-layer metal grating and the lower-layer metal grating are orthogonally arranged in space to form a Fabry-Perot cavity; the liquid crystal layer is filled between the upper pre-oriented film and the lower pre-oriented film, and the liquid crystal director has in-plane pre-orientation; the upper-layer metal grating and the lower-layer metal grating serve as a first electrode and a second electrode respectively and are used for receiving external voltage and controlling the liquid crystal director to be dynamically switched between an in-plane state and an out-of-plane state; according to the invention, the spatial modulation of the incident terahertz wave intensity can be realized, and the problems of photoelectric function conflict and pixel crosstalk of a metal structure are effectively solved.

The invention discloses a light spot shaping device and method based on partition modulation and a customized polarization element, and relates to the technical field of laser processing, random polarized light is divided into S / P light through a 42.5-degree customized polarization beam splitter (PBS), the S / P light is emitted to a partition silicon-based liquid crystal spatial light modulator (LCoS SLM) in parallel through a total reflection surface, the liquid crystal orientation difference of A / B regions is 90 degrees, independent modulation is achieved, and the light spot shaping device and method based on the partition modulation and the customized polarization element are obtained. And combining the light beams by using a P reflection type polarization beam splitter (R-PBS) and ensuring that the optical path is consistent. The method comprises the steps of beam expansion, light splitting, partition modulation, light beam combination, secondary beam expansion focusing and the like. According to the scheme, the energy utilization rate is close to 100%, the method is suitable for lasers of 50 W or above, the machining efficiency of the shaped annular light spots is improved by two times or above compared with Gaussian beams, the temperature gradient is reduced, the method can be used for laser welding and metal 3D printing, and the problems of energy waste, heat effect and insufficient precision are solved.

The application discloses an imaging optical system and an imaging method, the system comprising a controller and sequentially arranged front mirror group, spatially tunable component, rear mirror group and imaging detector; the spatially tunable component is located on a primary image plane and comprises sequentially arranged first polarizer, liquid crystal spatial light modulator and second polarizer; the first polarizer is used for polarizing natural light emitted by a target object to obtain polarized light; the liquid crystal spatial light modulator is used for phase modulating the polarized light of a target coordinate region to obtain phase modulated light; the second polarizer is used for detecting the phase modulated light to obtain amplitude modulated light; and the imaging detector is used for receiving a target image corresponding to the amplitude modulated light. The system firstly performs phase modulation on incident light through the spatial light modulator, and then realizes amplitude modulation through the second polarizer, so that the dynamic range of the system is greatly improved; and the system can also realize one-time modulation of light intensity at different spatial positions of a light field, so that the modulation efficiency is improved.