نتایج جستجو برای: holographic optical element
تعداد نتایج: 478315 فیلتر نتایج به سال:
The issue of interfacing holographic memory with an electronic processor is discussed. The high speed and parallel access of two dimensional, page formatted optical data from holographic memory can be utilized to reconfigure an electronic processor at a rate much faster than traditionally available. This new technique could be the stepping stone to a new class of high performance device for a v...
A method for copying holographic optical elements with partially coherent light by using a holographic system is presented. The system includes two holographic lenses that are made as thick-phase holograms on silver halide-sensitized gelatin. The geometric conditions during reconstruction of the holographic system with white light are studied and the performance of the system is analyzed by a r...
A method has been developed for retrieving the complete angular selectivity profile of transmission holographic gratings in one step. The method is applied to study in real time the shrinkage and changes in the effective optical thickness of a slanted holographic grating recorded in an acrylamide-based photopolymer. It can form the basis of a holographic sensor of analytes that cause a thicknes...
In a holographic optical learning network, the decay of multiply exposed holographic interconnections can adversely affect the training of the network. A new dynamic photorefractive holographic memory is described that allows an arbitrarily long sequence of adaptations by rejuvenating decayed holograms with a simple all-optical feedback loop.
Recent optical and computer graphic methods have produced the "alcove" holographic stereogram that is capable of reconstructing in laser light an undistorted 3-D projected image from a series of 2-D views on a concave surface. This technique requires only one holographic step to obtain an undistorted real image stereogram, formerly accomplished by two separate holographic procedures. The hologr...
چکیده ندارد.
A holographic projection system with optical zoom is demonstrated. By using a combination of a LC lens and an encoded Fresnel lens on the LCoS panel, we can control zoom in a holographic projector. The magnification can be electrically adjusted by tuning the focal length of the combination of the two lenses. The zoom ratio of the holographic projection system can reach 3.7:1 with continuous zoo...
The requirements on and the performance of holographic Fourier transform lenses for a matched-filter optical processor are discussed. The holographic aberrations were analyzed using a ray-tracing computer program, and holographic lenses were fabricated and assembled into an optical processor. Analysis and experimental results show that holographic optics are capable of processing images of larg...
The confocal detection principle is extended to a highly parallel optical system that continuously analyzes thousands of concurrent sample locations. This is achieved through the use of a holographic laser illumination multiplexer combined with a confocal pinhole array before a prism dispersive element used to provide spectroscopic information from each confocal volume. The system is demonstrat...
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