单次曝光彩色数字全息术的发展

Development of One-Shot Color Digital Holography

本论文提出一种新型单次曝光数字全息术,可用于三维彩色图像复振幅全息图的瞬时记录。通过空间抽取离轴全息图和插值抽取全息数据可获得参考光位相不同的3幅全息图,从这3幅全息图中提取得到复振幅全息图。单次曝光全息术可推广应用于记录采用常规位相分布参考光的全息图。本文还讨论了单次曝光全息术中波段宽度的极值。通过数值模拟和光学实验验证了复振幅全息图的单次曝光记录。结果表明,由于完全消除了直射光、零级干扰噪声和共轭光的干扰,高分辨率的精细彩色图像可从复振幅全息图中得到再现。单次曝光数字全息术能够通过采用RGB脉冲激光来记录移动物体的彩色图像,并在实时全息显示中再现移动的彩色图像。

A new technology of one-shot digital holography is developed for instantaneous recording of the complex-amplitude hologram for color three-dimensiona/images. Three holograms for different phases of the reference light are obtained both by spatially sampling an off-axis hologram and by interpolating sampled hologram data, and the complex-amplitude hologram is extracted from these three holograms. The one-shot holography is generalized for recording the hologram with the reference light having general phase distribution, and the limitation of bandwidth in one-shot holography is also discussed. Numerical simulation and optical experiment are carried out to demonstrate one-shot recording of the complex-amplitude hologram. Results show that fine color images with high resolution are reconstructed from the complex-amplitude hologram as a result of perfect elimination of the direct beam, the zero-order noise and the conjugate beam. The one-shot digital holography can make possible to record color images of the moving object by adopting RGB pulse lasers, and to reconstruct moving color images in real-time with the holographic display.