Opaque media is like teeth or human tissue. Coherent light can be focused through them and the principle is applied in therapy. The two different optimization algorithms are programed. To approach the actual situation, a noise is added to the algorithms. And the algorithms are applied in our optical path.

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To perform Augmented reality perfectly by computer generated hologram(CGH), we optimize Iterative Fourier Transformation Algorithm, and connect the sensor to the control center to enable the CGH interacting with people. Finally, we proposed a data compression method that can enhance generation speed such that real-time CGH can be achieved.

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In this study we present a numerical simulation of free-space propagating broadband terahertz vortex beams generated by a spiral phase plate (SPP). The algorithm based on scalar diffraction theory was used to obtain the spatial amplitude and phase distributions of the vortex beam in the frequency range from 0.1 to 3 THz.

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We presented a diffractive volumetric 3D projection system to display 3D layered images. This system contained a phase-only spatial light modulator, a modified mirascope, and a diffusing cube. The images were produced by phase-only diffractive optical elements designed by using an iterative angular spectrum algorithm.

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A scanning method using fringe projection to perform the 3D shape measurements is proposed. A reliable image processing method is provided to enhance the accuracy of the scanning fringe projection technique. Noises and errors for surfaces on the edge area can be efficiently detected and reduced.

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Light-sheet based microscopic techniques offer the ability to acquire optically sectioned fluorescence images with good background rejection for tissue imaging in wide-field fashion; however, none of these techniques have the capability to image multiple fluorescent planes at the same time. In this paper, we present an imaging scheme, incorporating side illumination with multiple light-sheets and multiplexed volume holographic gratings, to simultaneously obtain multi-plane images with optical sectioning capability, and no need for any axial scanning. The proposed imaging geometry is configured such that different depths inside an object are illuminated from side by multiple light sheets, and also serve as the input focal planes for subsequent multiplexed volume holographic imaging gratings. We present the design, implementation, and experimental image data demonstrating the proposed system’s ability to obtain optically sectioned and multi-plane images of fluorescently labeled biological tissue samples in one shot.

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The simulation implementation of quantized diffractive phase element (DPE) which generates gradient axial beam (GAB) along the optical axis is described. In order to evaluate the influence of numbers of quantization levels of DPE on the axial intensityce, the illuminance distribution of GAB along the optical axis is calculated and analyzed. The analyses reveal that the quantization effect of DPE obviously casuses the fluctuation in the axial distribution of GAB.

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Combining laser speckle imaging with diffusion theory, we acquire decorrelation time constant as function of radial distance from illuminated center. We use 150 micrometer cover glass and 1050 micrometer glass slide for testing. The radial distance of inflection point can be used to qualitatively distinguish the thickness of glass layer.

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A fabrication approach using poly(methyl methacrylate) (PMMA) and methacrylic acid (MA) for holographic materials is presented. To increase the diffraction efficiency, the high refractive index species is filled into the materials. Performance of the diffraction efficiency is evaluated.

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Highly coherent property of laser often yields laser speckles which influence the image quality in many optical systems. In this paper, we designed an optical system to modulate the degree of coherence of incoming field by applying random phase screens to the light source with phase SLM, trying to reduce the effect of laser speckles.

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Three azobenzene-based composites are fabricated for optical storage. Performances of their diffraction efficiencies are evaluated.

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The image quality of the full-color computer generated holography is investigated in this study. Modified Gerchberg-Saxton Algorithm and a color-full CGH projection system are used for reconstructing the color-full holographic image. Then a series methods to analyze the full-color holography image is discussed.

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A holographic material based on photopolymerizable silica was prepared by sol-gel process Diffracrion efficiency and selectivity of this holographic material is described as well.

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Using a surface plasmon resonance apparatus and the common-path heterodyne interferometry, a modified method is presented to measure the small displacements. The validity of this method was demonstrated experimentally, and the displacement measurement resolution is about 61.08 nm.

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Holography has a long researching history. There are many types of holography and applications since the development of the technology. Computer generated hologram (CGH) is a popular research topic in recently years. CGH has many applications in bio-medicine, entertainment, and education. In this paper, we investigate and modify IFTA algorithm for CGH. We perform computer simulation with MATLAB.

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We developed an algorithm which combined the angular spectrum and the iterative optimization algorithm, called iterative angular spectrum algorithm (IASA). The IASA overcome several problems in simulation of propagation of optical waves. The spatial light modulator displayed the diffractive optical elements designed using the IASA, and successfully generated 3D images.

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The main idea of this research is to improve the quantization effects, in order to produce much better CPI value by using simulated annealing (SA) method. A color image was transformed into CIELab color space components to yield proper reference function for image recognition.

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In this paper,we demonstrated the theoretical calculation of the equivalent grating pitch of the combination of the triple holographic diffraction gratings which applied to use for in- plan displacement measurement arranged in four optical configurations. Both wave-vector analysis method and diffracted order analysis method are considered. The experiment results indicated that the diffracted order analysis method showed good agreement to the measurement results in four optical configurations. Besides, the best resolution of the in-plan displacement can be reached to 0.55 nm which measured by the equivalent grating pitch of 2.08 m.

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We presented the spatial distribution of the maximum of terahertz field in time domain when generated by a femtosecond filament. It is shown that as a result of the propagation of the terahertz field forms a spherical wave front, on the edge of which the maximum of amplitude has a temporary delay in contrary to its central part.

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A polymer-dispersed-liquid-crystal device is applied to holographic storage system. Because the polarization of one beam is changed by the device, information can be recorded by interference of two beams with orthogonal polarization states.

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