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64 results about "Photorefractive crystal" patented technology

Device and method for realizing holographic three-dimensional (3D) images

ActiveCN103064275ARealize holographic 3D dynamic display effectHolographic optical componentsHolographic object characteristicsBeam splittingReference beam
The invention discloses a device for realizing holographic three-dimensional (3D) images and a method for realizing the holographic 3D images. The device comprises a recording unit and a displaying unit, wherein the recording unit comprises a laser generating unit, a beam splitting unit, a photorefractive crystal and a rotating unit, wherein the laser generating unit is used for generating lasers; the beam splitting unit is used for receiving the lasers emitted by the laser generating unit and splitting the lasers into a reference beam and an object beam which is emitted to an object to be photographed; the photorefractive crystal is used for respectively receiving the reference beam form the beam splitting unit and the object beam from the object to be photographed and forming a holographic 3D image; and the rotating unit is connected with the photorefractive crystal and used for rotating the photorefractive crystal synchronously when every new holographic 3D image is recorded. When the holographic 3D images are displayed, the image reproduction of the different holographic 3D images can be realized by rotating the photorefractive crystal in a reproduction light path, the holographic 3D images can be recorded and displayed quickly and conveniently, and the dynamic display of the holographic 3D images can also be realized.
Owner:BOE TECH GRP CO LTD +1

Hologram recording and reproducing apparatus

A hologram recording and reproducing apparatus preforms to record data on a recording medium and reproduce data from the recording medium. The recording medium is made of a photorefractive crystal having a parallel plate shape. The apparatus includes: a support portion for detachably supporting and rotating the recording medium; a recording-reference-light-beam-supplying-portion for supplying a coherent recording reference light beam propagating along an optical axis to a major surface of the recording medium; a signal-light-beam-supplying-portion for supplying a coherent signal light beam which is modulated in accordance with image data, in an optical path into the recording medium such that the signal light beam intersects with the reference light beam to produce an optical interference pattern with the reference and signal light beams within the recording medium; a reproducing-reference-light-beam-supplying-portion for supplying into the recording medium a coherent reproducing reference light beam propagating in an opposite direction along the optical axis of the recording reference light beam to generate a phase conjugation wave from a refractive-index grating of the light interference pattern; a splitting portion for splitting the phase conjugation wave from the optical path of the signal light beam to image a dot pattern with the phase conjugation wave; a photo-detecting portion for detecting the dot pattern imaged with the phase conjugation wave to reproduce the image data.
Owner:PIONEER CORP

Beam splitting and reshaping device of frequency linear chirped pulses

The invention discloses a beam splitting and reshaping device of frequency linear chirped pulses. The beam splitting and reshaping device of the frequency linear chirped pulses comprises a photorefractive crystal flat plate, multiplexing body holographic gratings and reshaping body holographic gratings, the multiplexing body holographic gratings are different in grating vector direction and identical in other characteristic parameters, the reshaping body holographic gratings are different in grating separation distance and identical in other characteristic parameters, the multiplexing body holographic gratings and the reshaping body holographic gratings are respectively placed behind all the chirped pulse laser to reshape the pulses. According to the beam splitting and reshaping device of the frequency linear chirped pulses, the multiplexing body holographic gratings and the reshaping body holographic gratings are integrated into a single-block photorefractive crystal flat plate, the structure is compact, performance is stable and reliable, the wavelength division multiplexing technology and the reshaping technology of the holographic gratings are combined in an organic mode, frequency shift and reshaping can be achieved for general chirped pulses and laser pulses, the beam splitting and reshaping device of the frequency linear chirped pulses is particularly suitable for a macro-energy high-power chirped pulse system.
Owner:SHANGHAI NORMAL UNIVERSITY

Efficient multi-line narrow-band large format holographic filter

Narrow-line holographic filters that can include a plurality of lines and that can be structured to provide a large aperture device. Materials that can be used to construct filters include glasses, photorefractive crystals such as lithium niobate and photorefractive thick polymers. The filters are fabricated by assembling a plurality of elements having the same one or more narrow line holographic filter patterns written thereon, in mutual orientation such that each element has a surface defined by a length and a width adjacent a corresponding surface of a neighboring element, and has a surface defined by a thickness and one of a length and a width accessible to impinging illumination. Filters exhibiting a plurality of characteristic narrow lines, and having arbitrarily large apertures can be fabricated. Methods of fabricating and using the filters are described.
Owner:CALIFORNIA INST OF TECH

Dual acousto-optic modulation phase conjugate heterodyne detection device

The invention provides a dual acousto-optic modulation phase conjugate heterodyne detection device. The device is characterized in that light energy can be effectively utilized, the device is suitable for weak signal measurement, the vibration and spectrum of micro vibration can be obtained, a Soleil-Babnet phase compensator can be used to obtain the phase generated by the amplitude of micro vibration; by comparing a reference light path and a measurement light path, the common mode noise generated by an environmental factor change is greatly reduced, and the measurement precision is improved; the phase conjugate light with a phase compensation characteristic generated by a photorefractive crystal is used, the 'speckle noise' generated by the surface of a detected object is eliminated, and the surface of the detected object is expanded to a comparatively rough surface from an approximate mirror; a dual acousto-optic modulator is used to obtain two mutually vertical orthogonal polarized light, the influence of acousto-optic modulator light intensity modulation is eliminated, the high precision measurement of the amplitude is easy to realize; and the beat frequency of the dual acousto-optic modulator is an intermediate frequency difference, the processing of a low frequency signal in a radio frequency range is realized, and the interference of a low frequency noise is eliminated.
Owner:ZHONGBEI UNIV

Recording medium, manufacturing method thereof, holographic recording device, holographic reproducing device and holographic system

ActiveCN105425568ASolve the problem of slower, less efficient holographic implementationImprove the efficiency of reproductionNon-linear opticsQuantum dotTransparent conducting film
The invention relates to a recording medium, a manufacturing method thereof, a holographic recording device, a holographic reproducing device and a holographic system; wherein the recording medium, the manufacturing method thereof, the holographic recording device, the holographic reproducing device and the holographic system belong to the field of display technology. The recording medium comprises two transparent conductive film layers and a liquid crystal layer between the two transparent conductive film layers, wherein quantum dots are doped in the liquid crystal layer. According to the recording medium, the manufacturing method thereof, the holographic recording device, the holographic reproducing device and the holographic system, through utilizing the liquid crystal layer in which the quantum dots are doped, spatial charge fields which are generated by the quantum dots increase realignment of liquid crystal modules and increasing target object information recording speed of the recording medium. Problems of relatively low object information recording speed and relatively low holographic recording realization speed in a photorefractive crystal as the recording medium in related technology are settled. An effect of quick object target information recording by the recording medium is realized. Furthermore holographic reproduction efficiency is improved.
Owner:BOE TECH GRP CO LTD +1

System and method for increasing laser imaging resolution ratio under turbid water

The invention discloses a system and a method for increasing a laser imaging resolution ratio under turbid water. The system comprises a laser incidence module and a laser imaging module, wherein thelaser incidence module comprises a blue / green pulse laser and an emission optical unit; an output end of the blue / green pulse laser is connected with an input end of the emission optical unit; the output end of the emission optical unit faces a target; the laser imaging module is used for receiving an imaging signal reflected by the target and comprises a receiving optical unit, a range gate unit,a non-linear photorefractive crystal, an imaging lens, a photoelectric probe, a digital signal delayer and an additional voltage source; the receiving optical unit, the range gate unit, the non-linear photorefractive crystal, the imaging lens and the photoelectric probe are sequentially connected; the digital signal delayer is connected with the range gate unit and the additional voltage source is connected with the non-linear photorefractive crystal. Backscattering noise is filtered out and an image contrast ratio is increased; the strength of non-linear self-focusing effects of noise-containing image light beams is controlled, so that gathering of forward scattering noise to image signals can be realized, and thus, the laser imaging resolution ratio of the target under the turbid watercan be increased.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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