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本文主要叙述了在全息存贮中改善付里叶变换全息图像质的方法,包括离焦法和随机相移器法。分析了全息图尺寸及其记录的空间频带宽度与离焦量的关系;给出和比较了不同离焦量情况下的以及离焦法与随机相移器法的实验结果。实验和分析表明,选择适当的光束衡量比和曝光量,并将离焦法与随机相移器方法结合用于全息存贮,可以得到较高的再现像衍射效率和信噪比(SNR)。最后还给出了用稀释显影加漂白的方法可进一步提高衍射效率的实验结果。
This paper mainly describes the methods of improving Fourier transform holographic image quality in holographic storage, including defocus method and random phase shifter method. The relationship between the size of the hologram and its spatial frequency bandwidth and the amount of defocus was analyzed. The experimental results of the defocus method and the random phase shifter method were given and compared under different defocus conditions. Experiments and analyzes show that diffraction efficiency and signal-to-noise ratio (SNR) can be improved by selecting appropriate beam ratio and exposure, and combining defocus method and random phase shifter method for holographic storage. Finally, the experimental results of further improving the diffraction efficiency with the method of dilution development and bleaching are given.