Sui Xiaomeng, He Zehao, Jin Guofan, Chu Daping, Cao Liangcai
Opt Express. 2021 Jan 18;29(2):2597-2612. doi: 10.1364/OE.414299.
Herein, we propose a band-limited double-phase method to improve the quality of reconstructed images encoded by double-phase holograms (DPHs) derived from complex-amplitude light waves. Although the quality of images produced by DPHs was improved compared to that of conventional holographic images, it still suffered from degradation because of the spatial shifting noise generated during the conversion from complex-amplitude holograms to phase-only holograms. The proposed method overcomes this shortcoming by defining a band-limiting function according to the spatial distribution of DPHs in the frequency domain to remove the specific spatial frequency components severely affected by the spatial shifting of DPHs. The sharpness of images reconstructed from band-limited DPHs with appropriate optical filtering showed an improvement of 36.84% in simulations and 51.67% in experiments evaluated by 10-90% intensity variation.
在此，我们提出一种带限双相位方法，以提高由复振幅光波产生的双相位全息图（DPH）编码的重建图像质量。尽管与传统全息图像相比，DPH产生的图像质量有所提高，但由于在从复振幅全息图转换为纯相位全息图的过程中产生的空间移位噪声，其仍然存在退化问题。所提出的方法通过根据DPH在频域中的空间分布定义一个带限函数来克服这一缺点，以去除受DPH空间移位严重影响的特定空间频率分量。通过10 - 90%强度变化评估，在模拟中，从具有适当光学滤波的带限DPH重建的图像清晰度提高了36.84%，在实验中提高了51.67%。
