13 results about "Kinoform" patented technology

The present invention discloses a method for recording and displaying photopolymers based on a computer-generated holographic bin algorithm. S1: After a beam of light emitted by a femtosecond pulse laser is expanded and collimated, the pulse laser is focused on a photopolymer material through an objective lens, causing the refractive index of the photopolymer to change. The position of the photopolymer is controlled by controlling a translation stage to achieve three-dimensional recording of two pieces of material. S2: The complex amplitude distribution of the object is calculated through the computer-generated holographic bin algorithm and the two pieces of material are encoded. The exposure time and other parameters are controlled by a computer, and the femtosecond laser is used to write the calculated and encoded phase information diagram on the photopolymer. S3: After recording, the second beam splitter and the objective lens in front of the recording position are removed, and a plane wave is used to simultaneously irradiate the two pieces of engraved photopolymer and combine the beams to obtain a reproduced image of the three-dimensional object. The recording and display of the three-dimensional object can be achieved.

The invention provides a non-centrosymmetric material interface state spatial distribution detection method and system, and the method comprises the steps: carrying out the light splitting of a preset laser pulse, and forming reference light and incident light; adjusting the focus action position of the incident light to enable the focus of the incident light to act on the interface area of the sample; constructing a kinoform, and modulating the incident light according to the kinoform; irradiating the interface of the sample by using the modulated incident light to obtain reflected light; judging whether the light intensity of the beam combining light meets a convergence condition; if not, carrying out iterative optimization on the kinoform; if yes, taking the current kinoform as a target kinoform; and determining interface state space distribution information of the sample according to the target kinoform. According to the invention, the distinguishing of the body signal and the interface signal of the non-centrosymmetric material is realized through Z-axis scanning and quantitative coherent detection, the dynamic compensation of the wavefront distortion of the incident light is realized based on the iteration of the kinoform, and the interface electronic state space distribution information of the sample can be obtained through the inversion of the wavefront distortion.

The invention provides a method and system for detecting interface state spatial distribution of a centrosymmetric material, and the method comprises the steps: carrying out the light splitting of a preset laser pulse, and forming reference light and incident light; constructing a kinoform, and modulating the incident light according to the kinoform; irradiating the interface of the sample by using the modulated incident light to obtain reflected light; collecting light intensity after the reflected light and the reference light are coherent, and judging whether the light intensity meets a convergence condition or not; under the condition that the light intensity does not meet the convergence condition, performing iterative optimization on the kinoform; under the condition that the light intensity meets a convergence condition, taking the current kinoform as a target kinoform; and determining interface state space distribution information of the sample according to the target kinoform. According to the invention, the dynamic compensation of the wavefront distortion of the incident light is realized based on the iteration of the kinoform, the method is not only used for improving the quality of coherent light signals, but also used as a quantitative basis for reflecting the wavefront modulation amount of the sample interface, and the interface electronic state space distribution information of the sample can be obtained through the inversion of the method.

A holographic projector includes a display device arranged to form a holographic wavefront by spatially modulating light in accordance with a hologram of a picture. The holographic projector includes a magnification system including a first and second lens. The first lens is arranged form a holographic reconstruction of the picture by focusing the holographic wavefront towards a front focal plane of the first lens. The holographic reconstruction of the picture includes a plurality of pixels. The holographic projector includes a kinoform disposed between the first and second lens and arranged to apply a phase-delay to each pixel of the holographic reconstruction. The holographic projector includes a movement assembly arranged to move the kinoform such that a plurality of different phase-delays are applied to each pixel. The kinoform includes an array of zones and is arranged such that the width of each zone is substantially equal to the distance between adjacent pixels.

The application discloses a large-aperture double-surface focusing Kinoform lens and a design method. n The application discloses a large-aperture double-surface focusing Kinoform lens and a design method. (n‑1)22 The application discloses a large-aperture double-surface focusing Kinoform lens and a design method. The application discloses a large-aperture double-surface focusing Kinoform lens and a design method. The application discloses a large-aperture double-surface focusing Kinoform lens and a design method. The application discloses a large-aperture double-surface focusing Kinoform lens and a design method.

A holographic projector comprises a display device arranged to form a holographic wavefront by spatially modulating light in accordance with a hologram of a picture displayed thereon. The projector co

A (phase-delay) kinoform (2200), arranged for rotation (centred at 2210), divided into a plurality of concentric zones (2220, 2230), each concentric zone sub-divided into a plurality of phase-delay ar

A (phase-delay) kinoform (2200), arranged for rotation (centred at 2210), divided into a plurality of concentric zones (2220, 2230), each concentric zone sub-divided into a plurality of phase-delay ar

The invention discloses a preparation method of a diamond two-dimensional X-ray Kinofm type refraction lens. The preparation method comprises the following steps: 1) designing an X-ray refraction lens CRL and converting the X-ray refraction lens CRL into a bidirectional Kinofm refraction lens BKL; the incident plane and the emergent plane of the BKL are both short Kinform type refraction lenses SKL; (2) respectively etching the two surfaces of the diamond sample original sheet to form SKL by adopting a layer-by-layer infinitesimal etching method and a high-repetition-frequency ultraviolet femtosecond laser three-dimensional etching technology; (3) optimizing the step error on the side wall of the SKL to obtain a diamond two-dimensional X-ray Kinoform type refraction lens; the optimization method comprises the following steps: calculating the height of each step as the step error removal depth corresponding to the step, and optimizing the step according to the step error removal depth corresponding to each step and the processing position. The diamond machining efficiency and accuracy can be effectively improved.

The present invention discloses a robust control method and system based on phase information pattern coding, which includes constructing a control system according to the incident light field and intensity distribution and the corresponding phase distribution; based on the control system, using a robust model predictive control algorithm and soft constraints to generate an attraction domain, and constructing a data set based on the attraction domain; based on the data set, expanding the data set based on a data density segmentation method; based on the expanded data set, training a symmetric neural network to determine a phase distribution prediction model; based on the current incident light field and intensity distribution, using the phase distribution prediction model to determine the current phase distribution; and generating a phase information pattern according to the current phase distribution. The present invention can obtain a high-precision phase hologram.

The application discloses a system and method for generating stable interference fringes by using a pure phase reflective liquid crystal spatial light modulator, and the system comprises a light source module, a laser collimation filtering and beam expanding module, a pure phase reflective liquid crystal spatial light modulator (SLM) control module and a CCD image acquisition module. The system can generate stable double-hole light spots by loading a gray-scale gradual phase grating on the SLM, replaces the method for generating double-hole light spots by using a photoetching mask in a traditional physical optical interference experiment, and can achieve the final result without the aid of other devices, and is simple and convenient to operate. In addition, compared with traditional interference systems such as a Talbot-Green system and a Mach-Zehnder system, the output interference fringes will not vibrate, and the calculation of the post-stripe movement amount is not affected, and the system has the characteristics of stable operation, flexible control and accurate calculation.

A kinoform arranged for rotation. The kinoform is divided into a plurality of concentric zones. Each concentric zone is sub-divided, in a circumferential direction, into a plurality of phase-delay areas. The number of phase-delay areas per concentric zone increases with the radius of the concentric zone. Adjoining phase-delay areas, in the radial and circumferential directions, have different phase-delays. The phase-delays may be pseudo-random to provide speckle reduction.

The invention belongs to the technical field of micro-nano, and particularly relates to a high-resolution Kinform combined zone plate lens and a design method thereof. The lens provided by the invention is formed by coaxially combining an inner-ring Kinoform flat plate zone plate area and an outer-ring rectangular multiple periodic zone plate area; wherein the inner ring area close to the center of the lens is composed of a Kinforming wave zone plate of a continuous parabola side wall, and the inner diameter and the outer diameter of each stage of wave zone meet the periodic relation of the Fresnel wave zone plate; the wave zone height is continuously changed in the radial direction to form refractive phase delay, so that the focusing efficiency close to the theoretical limit is realized in the + 1-level diffraction direction; a wave zone structure with a rectangular section is adopted in an outer ring area from two thirds of the radius to the outside, and on the premise that the radial period relation is kept, multiple period selection is conducted on wave zones, one or more effective wave zones are reserved every other effective wave zone, the other wave zones are emptied, and the outer ring wave zone equivalently works at a high diffraction order; the design can obtain an effective resolution equivalent to the original outermost ring width.