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报道了利用各种不同的光折变晶体作为位相滤波器，实现位相型物体的可见和振幅型物体的对比度周期性反转等结果，井给出广统一的理论分析．
Reported the use of a variety of photorefractive crystal as a phase filter to achieve the phase-type object visible and amplitude-type objects periodically reversal of contrast and other results, and give a broad theoretical analysis.