Experiments with a photodichroic recording and storage material with applications in ODP are described. Promising features of the material are: diffraction limited resolution; high dynamic range; room temperature oper...
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Experiments with a photodichroic recording and storage material with applications in ODP are described. Promising features of the material are: diffraction limited resolution; high dynamic range; room temperature operation; ease of fabrication; in situ recording with no delay, heat or chemical assistance; long term storage; reuseability; and recording and nondestructive reading at the same wavelength. Two new writing techniques are discussed in NaF at room temperature that use the same visible wavelength for recording and reading. Stored imagery, half-tone imagery, and gray scale reconstructions are presented and the first use of the material as an adaptive matched spatial filter is described.
The increasing popularity of optical communication has also brought a demand for broader bandwidth. The natural trend was to implement methods from traditional communication on optical fibers. One of the most effectiv...
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ISBN:
(纸本)0819447188
The increasing popularity of optical communication has also brought a demand for broader bandwidth. The natural trend was to implement methods from traditional communication on optical fibers. One of the most effective "traditional" methods is code division multiple access (CDMA). In this paper, we suggest the use of this approach for spatial coding applied to images, and for superresolution. In spatial coding, the approach is to multiplex several filters into one plane while keeping their mutual orthogonality. It is shown that within specific restrictions the output of all the filters can be sampled in the original image resolution and fully recovered through an all-optical setup. A theoretical analysis of such a setup is brought as well as experimental demonstrations are presented. Implementation for invariant pattern recognition is suggested. In superresolution, we propose using code division multiplexing in order to transfer a wider range of frequencies. Traditional methods for super resolution have sacrificed field of view for resolution. These methods multiplexed the signal on different carriers. Code division multiplexing for such a usage, has been shown to have superior capabilities, nearing almost Shannon's channel capacity limit. To enable such multiplexing we propose a unique setup that creates an incoherent cosine transform of the image. A theoretical analysis of the setup is brought and later compared with the empirical results.
The determination of the specific information in a message has proved of interest in coding (for instance in a hologram) as well as in dataprocessing itself. Also, simple considerations about the definition of optica...
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A laboratory bench has been developed and a laboratory manual has been prepared for the practical course in optical data processing including the following laboratory exercises: "Spatial Filtering of Images"...
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ISBN:
(纸本)0819448370
A laboratory bench has been developed and a laboratory manual has been prepared for the practical course in optical data processing including the following laboratory exercises: "Spatial Filtering of Images", "optical Bistability", "Intensity Self-Oscillations and optical Chaos", "Logic optical Elements". These laboratory exercises enable the students to study the analog and digital information conversion methods and the effects underlying them. The laboratory bench was created on the basis of the electrically controlled liquid-crystal elements and involved a computerized recording system for temporal and spatial characteristics of light beams.
This paper is an introduction to ideas and concepts that underlie coherent optical systems. It is pointed out that these systems are limited to spectral analysis and linear, space-invariant processing. However, progre...
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This paper is an introduction to ideas and concepts that underlie coherent optical systems. It is pointed out that these systems are limited to spectral analysis and linear, space-invariant processing. However, progress is now being made towards the realization of more flexible operations, including systems capable of nonlinear operations and space-variant linear operations. It appears likely that a number of coordinate-transformation-processing systems will be realizable in all-optical form in the future.
This paper provides a survey of recent developments in analog-to-digital optical data processing. It presents the results of theoretical and experimental work carried out over the past few years by the Moscow Engineer...
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This paper provides a survey of recent developments in analog-to-digital optical data processing. It presents the results of theoretical and experimental work carried out over the past few years by the Moscow Engineering Physics Institute. Methods of fast holographic (medical) diagnostics involving a large number (50) of parameters are described. optical data processing methods that are realizable with simple optical arrangements are described. Using the physical parameters of coherent radiation and transformation of the coherence of light as it passes through an optical processor, it becomes possible to introduce information into the system with the aid of phase-amplitude light modulators, even at a high level of phase noise. This approach have led to holographic spatial frequency filters, partial-coherent holographic correlators, correlator of simultaneous transformation, a spectrum analyzer images directly from electron-beam tube and signals of NMR tomography.
The term planar projection refers to the integral of a threedimensional (3-D) function over a plane, as opposed to the line integrals that form the basic data set of computed tomography. Planar projections arise natur...
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Persistent spectral hole-burning (PSHB) and its applications in data storage and processing are described. Purely electronic zero-phonon lines having very high peak values in the low temperature impurity spectra of so...
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ISBN:
(纸本)0819410799
Persistent spectral hole-burning (PSHB) and its applications in data storage and processing are described. Purely electronic zero-phonon lines having very high peak values in the low temperature impurity spectra of solids are considered. Limitations for very large capacity PSHB memories put by the number of impurity molecules to store one bit are discussed. Doped with impurities optical fiber memory is proposed as a means to have low impurity concentration simultaneously with a large number of the impurities to store one bit. Bit-by-bit (digital) storage is compared to the distributed one and the advantages of the two versions of the latter - PSHB holography and PSHB modeling of neural networks - are considered. An experiment of simultaneous read-out over coordinates and frequency in neural network modeling is described. Requirements to PSHB materials and possibilities of the existence of materials effective at high temperatures are discussed.
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