77 results about "Phase plate" patented technology

A programmable 3D light beam shaping device based on the beamlet printing technology comprises a laser source, the laser source emits initial laser, the polarization state of the initial laser is adjusted through a rotatable half-wave plate, and then the initial laser is separated into an s component light beam and a p component light beam through a first polarization splitting prism, the p-component light beam enters a Dammann grating after being expanded, and a diffracted light beam containing a plurality of diffraction orders is generated; the diffracted light beam sequentially passes through a second polarization splitting prism, a quarter-wave plate and a first focusing element and is introduced into focal shift by a multi-stage phase plate array, and the spatial light modulator is used for adjusting the angle and position offset of subgroups of the light beam of the sub-beam array to generate a working light beam; the working light beam returns to the second polarization splitting prism through the original light path and enters the working area through the second focusing element, and a three-dimensional light field is generated; according to the device, the three-dimensional irradiance distribution in a machining area can be accurately controlled, so that multi-layer and depth-adjustable energy deposition is realized, and the machining quality, efficiency and consistency are remarkably improved.

According to the living cell observation device, the observation system and the observation method, a light beam generated by an illumination element arranged below a living cell is incident to a pyramid lens array module located above the living cell, the pyramid lens array module reflects the incident light beam at the same direction angle, and the reflected light beam is diffracted into direct light and diffracted light when passing through the living cell; the phase plate causes the direct light and the diffracted light to generate a phase difference, and the direct light and the diffracted light having the phase difference interfere with each other on the imaging element to generate a phase difference image of the living cells. The volume of the observation device is greatly reduced, especially the reduction in the height direction enables the observation device to be easily placed in an existing culture box, real-time and full-life-cycle observation of cells is realized, meanwhile, the pollution of the cells and the change of a culture environment are avoided, and the observation efficiency is improved. The advantages of a current phase difference type microscopic observation system in the aspect of image effects are reserved, and the requirements for precision and stability of a movement mechanism are lowered.

The application discloses an extreme ultraviolet coherent diffraction stack imaging method based on random phase modulation, which is realized through an extreme ultraviolet phase modulation stack imaging light path of a random phase plate. The imaging light path comprises a high harmonic light source, a pinhole, a phase plate and a photoelectric coupling detector. The high harmonic light source emits light to irradiate a probe. A sample to be measured is arranged between the pinhole and the phase plate. The phase plate is used for phase modulation. The light irradiated by the probe is irradiated onto the sample to be measured through the pinhole, propagates a preset distance, and then reaches the plane of the photoelectric coupling detector through the phase plate. The diffraction pattern of the sample to be measured is obtained. Iterative processing is performed on the first amplitude information of the emergent light, the second amplitude information of the reverse propagation, the first diffraction pattern light field and the first diffraction pattern light spot. The best sample to be measured pattern is obtained, and the best sample to be measured information and the best light irradiation probe information are separated. The method can realize lensless imaging, avoids aberration and aperture limitation caused by the use of a lens, and has a simpler system and lower cost.

The application discloses a vortex light interference device and method for measuring three-dimensional vibration and sound field rotation characteristics, wherein a helium-neon laser emits laser light, the laser light passes through a half-wave plate and a first polarization beam splitter prism, and is divided into object light and reference light; the object light passes through a first spiral phase plate and becomes vortex object light, the vortex object light passes through a second polarization beam splitter prism, a quarter-wave plate, and a beam expander lens, and is irradiated on a test sample surface, reflected light of the sample surface passes through the beam expander lens, the quarter-wave plate, the second polarization beam splitter prism, a beam splitter prism and a focusing lens, and is irradiated on a photodetector; the reference light passes through an acousto-optic modulator to generate frequency modulation, passes through a mirror and a second spiral phase plate to become frequency-modulated vortex light, and the vortex light passes through a beam splitter prism and a focusing lens and is irradiated on the photodetector; a computer calculates and demodulates frequency-modulated signals of the photodetector and modulation signals of the acousto-optic modulator, and finally obtains three-dimensional vibration information and sound field rotation characteristics of the sample.

The invention provides a high-precision multi-plane optical converter installation and adjustment method and an optical converter, and belongs to the field of optical path installation and adjustment testing. The problems that an existing method is tedious in debugging step and long in time consumption and lacks an effective compensation mechanism for the multi-degree-of-freedom coupling error are solved. The method comprises the following steps: adjusting relative positions and postures of a reflector and a phase plate according to optical feedback, so that the reflector is parallel to the phase plate; adjusting the position of the collimation single-mode optical fiber array relative to the phase plate according to the auxiliary positioning optical fiber and the phase modulation; and adjusting the position of the collimation multimode optical fiber according to the output power maximization. The method is mainly used in the free space optical communication field.

The invention relates to a manufacturing method of a phase plate and the phase plate. The manufacturing method comprises the following steps: providing a substrate; forming grooves and lug bosses, which are alternately distributed, on the substrate; arranging a shielding frame on the substrate, wherein the shielding frame forms a phase modulation region in a surrounding manner; wherein the edge of the groove is covered by the shielding frame. According to the manufacturing method of the phase plate provided by the invention, the shielding frame covers the edge of the groove, so that the influence of process deviation in the processing process is reduced, and the manufacturing yield of the phase plate is improved.

This invention provides a method for charged particle beam (CPB) phase contrast imaging. [Solution] In a CPB system, the phase contrast image is obtained by directing a sample-modulated CPB to the phase plate so that it has a diffraction plane displaced from the phase plate. Based on the interference fringes of the image, the lateral displacement of the CPB relative to the phase plate can be estimated and adjusted.

A programmable 3D beam shaping device based on beamlet printing technology, comprising a laser source, the laser source emits initial laser, the initial laser adjusts the polarization state through a rotatable half-wave plate, and then is separated into orthogonal s component beam and p component beam through a first polarization beam splitter prism; the p component beam is expanded and then enters a Dammann grating to generate a diffraction beam containing several diffraction orders; the diffraction beam passes through a second polarization beam splitter prism, a quarter-wave plate and a first focusing element in turn, introduces focal shift by a multi-stage phase plate array, adjusts the angle and position offset of the sub-group of the sub-beam array beam by a spatial light modulator to generate a working beam, the working beam returns to the second polarization beam splitter prism from the original light path and is emitted into a working area by a second focusing element, generating a three-dimensional light field; the device can accurately control the three-dimensional irradiance distribution in the processing area, thereby realizing multi-level and depth-adjustable energy deposition, and significantly improving the quality, efficiency and consistency of processing.

The utility model discloses a nanometer displacement measuring device which comprises a measuring casing and a test piece, one end of the measuring casing is provided with a grating, the inner wall of the measuring casing beside the grating is provided with a reflector, one side of the reflector is sequentially provided with an interference field, an optical amplification imaging system and a phase plate, one end of the reflector is provided with an image sensor, and the image sensor is connected with the measuring casing. The grating is arranged on the inner wall of the measuring casing, the image sensor is arranged on the inner wall of the measuring casing, a reflecting mirror is arranged on the inner wall, beside the grating, of the measuring casing, and an interference field, an optical amplification imaging system and a phase plate are further sequentially arranged on one side of the reflecting mirror, and the reflecting mirror, the interference field, the optical amplification imaging system, the phase plate and the image sensor are sequentially arranged on the inner wall, beside the grating, of the measuring casing. The phase difference of a transparent object is converted into the intensity difference, so that the contrast difference is highlighted, meanwhile, high-precision measurement is performed by utilizing the interference principle, the tiny difference of the surface height of a sample can be accurately measured, the displacement resolution below 1 nanometer can be realized, the debugging is simple, and the stability is good.

A laser apparatus includes an oscillator configured to output a pulse laser beam, a random phase plate disposed in an optical path of the pulse laser beam, and an optical pulse stretcher disposed in the optical path of the pulse laser beam that has passed through the random phase plate and configured to stretch a pulse time width of the pulse laser beam by transmitting part of the pulse laser beam, making the other part circulate at least once through a delay optical path, and outputting transmitted light and circulating light.

Manufacturing process of a spiral phase plate for influencing optical signals, characterized in that by ablation with homogenized laser radiation (8) of at least one laser (1) by means of - two disk-shaped and circular masks (2, 3) arranged one after the other in the laser radiation (8) in the beam direction, rotatable in the axis of the laser radiation (8) in connection with a drive (4, 5) connected to a control device (7), each with at least one cutout with at least one curved edge and / or at least one opening (10) with at least one curved edge, - a third mask arranged in the laser radiation (8) in the beam direction of the laser (1) after the two masks (2, 3) as first mask (2) and second mask (3) and - an imaging optical device located in the beam direction of the laser (1) after the masks (2, 3) provides at least one depression in a body (6) such that the bottom of the depression has at least one groove, at least one step, at least one flat surface, at least one spherical surface, at least one free-formed surface or a combination thereof and the diameter of the depression is limited or the edge geometry of the depression is influenced by means of the third mask.

A working-range-extending phase plate includes a central region, an inner annular region surrounding the central region, and an outer annular region surrounding the central region and the inner annular region. The central region has a central phase-transmission function. The inner annular region has an inner phase-transmission function. The outer annular region has an outer phase-transmission function. Respective magnitudes of the central, the inner, and the outer phase-transmission functions are, as a function of radial distance from an optical axis of the phase plate, one of: (i) constant, increasing, and increasing, (ii) decreasing, constant, and increasing, or (iii) decreasing, decreasing, and constant.

This invention provides a miniaturized high-pulse-energy Raman laser under vortex optical pumping conditions, relating to the field of Raman laser technology, and employing n 2 A square array of vortex phase plates serves as the optical element for generating vortex-pumped lasers. By adjusting parameters such as the topological charge of the array of vortex phase plates and the focal length of the array of short-focal-length lenses, the laser power density in the focal region is reduced. The focal region has n 2 A square array is arranged with ring-shaped light intensity distribution units, ensuring that the laser power density of each unit in the focal region is greater than the Raman laser generation threshold and less than the laser-induced breakdown threshold. Therefore, the total Raman laser energy is n times the Raman laser energy generated by each unit. 2 This technology ultimately enabled the output of high-energy, high-beam-quality Raman lasers, with Raman laser pulse energies reaching hundreds of millijoules or even joules.

The present application relates to the technical field of optical engineering and digital twin cross, and specifically provides a practical optical system and simulation model parameter consistency control method, comprising: establishing a simulation model of a practical optical system, defining parameters of each element in the simulation model as variables, measuring parameter values of each element of the practical optical system and assigning values to the simulation model, obtaining simulation performance values of the simulation model and performance values of the practical optical system under the same conditions, and comparing to generate a performance consistency error report, determining potential error elements according to the performance consistency error report, and correcting errors through a virtual compensator and a phase plate to obtain a digital twin of the practical optical system. The present application systematically realizes correction of the simulation model and solves the problem of disconnection between the practical optical system and the simulation model.

The invention relates to a light converter based on angle multiplexing and application thereof, and the light converter comprises a multi-angle light input device which is used for emitting a plurality of input light beams with different incident angles, and all the input light beams are focused in the same area of a regulation and control assembly; the regulation and control assembly is arranged on the light emitting side of the multi-angle light input device and comprises a plurality of phase plates which are arranged in parallel at intervals, and the phase plates are perpendicular to the light propagation direction; and the light receiving device is arranged on the light emitting side of the regulation and control assembly and used for receiving the output light modulated by the regulation and control assembly. A new regulation degree of freedom is added under the condition that the inherent state of incident light is not changed, and the distance between the cascade phase plates can be as low as millimeter level. The working area of the required phase plate is remarkably reduced, the system structure is light and miniaturized, parallel processing of more input and output channels can be supported under the same physical size, and a new way is provided for large-scale input and output.

The application provides a spiral phase contrast filter microscopic imaging system for improving AI recognition rate of biological cells, which comprises a light source, a pinhole diaphragm, a microscopic imaging system, a spiral phase plate and a charge coupled device (CCD), wherein the microscopic imaging system comprises a first condenser, a second condenser, a sample stage, an objective lens, a first mirror, a second mirror and a third condenser; the light beam of the light source is gathered after passing through the first condenser and passes through the pinhole diaphragm; the pinhole diaphragm converts the light beam of the light source into a point light source; the light beam of the point light source is parallelly irradiated onto the sample stage after passing through the second condenser; the spiral phase plate is located on the conjugate plane of the point light source emitted by the pinhole diaphragm and is used for performing radial Hilbert transform processing on the image in the frequency domain; the application can obtain an edge-enhanced image in the final imaging, and the application of the image to an AI recognition algorithm can significantly improve the recognition rate; compared with a bright field image, the AI recognition success rate of the application is greatly improved.

The present application relates to the cross field of optical computing and artificial intelligence and discloses a rotatable modulation layer optimization method and system based on a diffraction neural network, comprising: S1, loading a target image as an input layer through a spatial light modulator, S2, using a coherent light source to irradiate the input layer; S3, for different tasks, jointly optimizing and training the phase of a multi-layer general diffraction modulation layer and a rotating diffraction modulation layer to obtain the corresponding phase parameters I and phase parameters II of each general diffraction modulation layer and rotating diffraction modulation layer after training; S4, printing the general solidified phase plate of each general diffraction modulation layer and the rotating solidified phase plate of the rotating diffraction modulation layer based on the phase parameters I and phase parameters II obtained in S3, for constructing a physically rotatable diffraction optical network when different tasks are formed. Through the rotating diffraction modulation layer, the present application can realize optical computing tasks in different complex scenes, without the need to retrain the diffraction network, and has the characteristics of multi-task reuse.

The invention relates to the technical field of optical engineering and digital twinborn crossing, and particularly provides a parameter consistency control method for an actual optical system and a simulation model, which comprises the following steps of: establishing the simulation model of the actual optical system, and defining parameters of each element in the simulation model as variables, parameter values of all elements of the actual optical system are measured, assignment is conducted on the simulation model, simulation performance values of the simulation model and performance values of the actual optical system are obtained under the same condition, a performance consistency error report is generated through comparison, elements with potential errors are determined according to the performance consistency error report, and the simulation performance values of the simulation model and the performance values of the actual optical system are obtained. Error correction is carried out through the virtual compensator and the phase plate, and digital twinning of an actual optical system is obtained. According to the invention, the correction of the simulation model is systematically realized, and the problem that actual optics and the simulation model are disjointed is solved.

A working-range-extending phase plate includes a central region, an inner annular region surrounding the central region, and an outer annular region surrounding the central region and the inner annular region. The central region has a central phase-transmission function. The inner annular region has an inner phase-transmission function. The outer annular region has an outer phase-transmission function. Respective magnitudes of the central, the inner, and the outer phase-transmission functions are, as a function of radial distance from an optical axis of the phase plate, one of: (i) constant, increasing, and increasing, (ii) decreasing, constant, and increasing, or (iii) decreasing, decreasing, and constant.

The invention relates to a microscope with a light source for emitting excitation light, an illumination beam path for directing the excitation light into a sample area, wherein the illumination beam path comprises a polarization manipulator for changing a polarization state of the excitation light, a phase plate for generating an illumination pattern, a cylindrical optic for generating an elongated distribution of the excitation light, a scanning unit for scanning the elongated distribution of the excitation light through the sample area, and an illumination objective for directing the excitation light into the sample area, a camera for capturing images of a sample, a detection beam path with a microscope objective for directing emission light onto the camera, and a control unit for controlling the scanning unit and / or the camera and for reading out measurement data from the camera.The microscope is characterized in that the camera is arranged in a non-scanned part of the detection beam path and that the control unit is configured to synchronize a location of a readout slit-shaped area in a sensor plane of the camera with a location of the elongated distribution of the excitation light in a plane of the sample. The invention also relates to a slide reader and a method for microscopy.

The application provides a differential imaging microscope based on a virtual point spread function, which comprises a laser, a shaping lens, a polarizer, a 1 / 2 glass, a 1 / 4 glass, a phase plate, a light splitting module, an X-Y scanning mechanism, a scanning lens, a tube lens, an objective lens, a nanometer displacement table, an objective lens, a tube lens, a scanning lens, a detection lens and a surface array detector; the X-Y scanning mechanism and the nanometer displacement table can drive the sample so that an illumination point can traverse an imaging area in a light spot; for each scanning point, the surface detector receives complete point spread function and sample convolution data; for one scanning imaging process, the surface detector can record scanning imaging data; and a computer processes the scanning imaging data to obtain differential imaging based on a virtual point spread function; the differential imaging can obtain a system effective point spread function with a smaller half-height width; and finally obtained images are a convolution of a sample and the system effective point spread function; the point spread function determines the imaging resolution of the system; and the imaging image resolution is higher.

The invention relates to an optical parameter detection device and method, in particular to an optical system wavefront detection device and method based on phase modulation. In order to solve the problems in the prior art that a multi-frame acquisition strategy adopted by a phase recovery method based on a point spread function is difficult to adapt to a dynamic test scene, a single-frame acquisition strategy is difficult to stably invert wavefront with conjugate symmetry, and iterative inversion operation time is relatively long and may fall into a local optimal solution, the invention provides a phase recovery method based on a point spread function. The invention discloses an optical system wavefront detection device based on phase modulation. The optical system wavefront detection device comprises a module, a first imaging lens, a first plane mirror, a beam splitter, a microscope objective, a second plane mirror, a partition phase plate, a second imaging lens and a photoelectric detector, and asymmetric phase coding is achieved through the partition phase plate. Based on the device, according to the method, the unsupervised deep neural network is combined with the physical driving layer, so that accurate inversion of different optical systems to be detected is realized.

The application discloses a high-security double-encryption information communication method based on reconfigurable acoustic holography. The correct information image and the pseudo information image are mixed and then input into a dynamic acoustic holographic neural network to output ciphertext information and an electronic key; a reconfigurable acoustic holographic phase plate carrying the ciphertext information is prepared; based on distance position information, partitioned electrically encoded ultrasonic transducers and the reconfigurable acoustic holographic phase plate are placed; an electrically encoded sequence is input into the transducer; the correct information image is decoded and reconstructed and then visualized on a sound field reconstruction visualization plane; and the reconfigurable acoustic holographic phase plate can be restored for the next encryption information communication. The method can mix the correct information into multiple groups of pseudo information to improve information security, and can encode the electronic key in multiple dimensions to further improve information decoding difficulty, and has a read-once-burn-after feature, so that secondary information leakage can be fundamentally prevented; the method is simple in equipment and difficult in information decryption, and is suitable for high-throughput transmission of text information.

The invention discloses a vector photoetching method and system based on a liquid crystal vector holographic phase plate and a storage medium. The method comprises the following steps: S1, determining a target polarization state and light intensity distribution of a vector light field for photoetching on a target plane of a substrate according to a target three-dimensional microstructure or an orientation pattern; s2, calculating a liquid crystal molecule orientation distribution pattern of the liquid crystal vector holographic phase plate based on a vector holographic principle according to the distribution of the target polarization state and the light intensity; s3, writing the liquid crystal molecule orientation distribution pattern into a light orientation layer of the empty liquid crystal box, and injecting a liquid crystal material into the empty liquid crystal box to obtain a liquid crystal vector holographic phase plate; s4, placing the to-be-photoetched substrate coated with the photo-alignment material in a far-field focal plane of a vector light field emitted by the liquid crystal vector holographic phase plate, and applying the light field to the liquid crystal vector holographic phase plate to complete photoetching of the to-be-photoetched substrate; according to the invention, liquid crystal device photoetching can be realized through single exposure of a replicable and low-cost single device.

The invention relates to a switchable light filter (6) comprising a first and a second linear polarizing filter (LP1, LP2) which have a transmaximum for light polarized parallel to a selectable first direction, wherein, from the viewing direction, the second linear polarizing filter (LP2) is closer to an observer, a first and a second phase plate (A, B) which are arranged between the first and the second linear polarizing filter (LP1, LP2), a switchable polarizing filter (3) which in a first operating mode B1 is mostly transparent to light having any polarization properties, and which in a second operating mode B2 is mostly transparent only to light polarized perpendicular or parallel to the first direction, such that in the first operating mode B1 light which passes through the first polarizing filter (LP1) into the switchable light filter (6),After passing through the switchable light filter (6), the angular spectrum is mostly unrestricted, and so that in the second operating mode B2, light which enters the switchable light filter (6) through the first polarizing filter (LP1) is at least partially restricted in its angular spectrum after passing through the switchable light filter (6). Furthermore, a lighting device and screen with such a switchable light filter (6) and a corresponding method are disclosed.

Phase contrast images in a charged-particle beam system are obtained by directing a CPB as modulated by a sample to a phase plate to have a diffraction plane that is displaced from the phase plate. Based on interference fringes in the images, a transverse displacement of the CPB with respect to the phase plate can be estimated and adjusted.

The application provides a multi-channel chaotic laser generating device and a laser generating method. The laser generating device provided by the application comprises a chaotic laser generating module, which is used for generating chaotic laser; a vortex multiplexing module, which is used for enabling the chaotic laser to carry multi-order OAM information; and an information collecting module, which is used for collecting the chaotic laser carrying multi-order OAM information emitted by the vortex multiplexing module. The device has a simple structure, can achieve double security of an optical communication system, can improve the communication capacity of the system, can realize high-speed, secure and free-space laser secure communication, can provide a possibility for utilization of the spatial dimension of chaotic light beams, can improve the capacity of optical communication while realizing information secure transmission, and can achieve technical effects by only simulating new multi-order multiplexing phase plate images and loading the images on the vortex multiplexing module when parameters and actual demands change, without the need of increasing or decreasing components, and the operation is simple and flexible.

The invention discloses a device and method for optimizing the output performance of a photoconductive switch based on vortex light. The device comprises a laser, and a filter, a focusing lens, a spiral phase plate and the photoconductive switch are sequentially arranged in the light beam propagation direction of the laser. The output end of the laser is coaxially aligned with the light-in surface of the spiral phase plate, and the light-out surface of the spiral phase plate is coaxially aligned with the gap area of the photoconductive switch. The method comprises the following steps: adjusting the height and horizontal position of each component to ensure that a light source is coaxial and a light beam sequentially passes through a laser window, a focusing lens and a photoconductive switch gap center at the center of a spiral phase plate; the laser is started to output Gaussian laser, the Gaussian laser is converted into vortex light through the spiral phase plate, the vortex light enters a semiconductor substrate area corresponding to an electrode gap of the photoconductive switch, photon-generated carriers are excited to be generated in the substrate, the photoconductive switch is converted into a conduction state from a dark state and a high-resistance state, and voltage is output. The problem that the output amplitude of the photoconductive switch is slightly improved by Gaussian light in the prior art is solved.

The invention provides an intelligent temperature control photo-thermal treatment device, and belongs to the technical field of medical laser application. According to the device, the laser and the infrared temperature measurement camera are integrated, and the laser beam emitted by the laser passes through the optical homogenization module and then reaches the working irradiation surface, so that the problems that in the prior art, the light spot center energy of a traditional Chinese medicine laser light source is concentrated, the edge energy is weak, a hot spot and a cold area are easily formed in a treatment area, and the treatment effect is poor are solved. Therefore, the treatment effect is inconsistent, and even normal tissues are damaged; meanwhile, an existing photo-thermal treatment device lacks a real-time temperature monitoring and feedback mechanism, so that the temperature of a treatment area cannot be accurately controlled. The optical homogenization module comprises a collimator lens assembly for collimating a laser beam input by a laser, a homogenization shaping lens assembly for redistributing energy of the laser beam passing through the collimator lens assembly, and a decoherence phase plate for destroying space-time coherence of laser and inhibiting speckle interference hot spots.

To provide a detection mechanism with high reliability for detecting rotational position. [Solution] The detection mechanism comprises a rotating operating member that rotates around a rotation axis, a phase plate that rotates together with the rotating operating member and is arranged on a plurality of concentric circles around the rotation axis and has a plurality of reflective parts that reflect light and a non-reflective part that reflects less light than each of the plurality of reflective parts, a plurality of detection elements that are arranged on a plurality of concentric circles facing either of the plurality of reflective parts and non-reflective parts and output a signal corresponding to the intensity of light reflected by either of the plurality of reflective parts and non-reflective parts, and determination means for determining the rotation position of the rotating operating member according to the output of each of the plurality of detection elements, wherein each of the plurality of detection elements is arranged on a different straight line from a plurality of straight lines that pass through the rotation axis and extend radially perpendicular to the rotation axis.