Lin Xiao, Hao Jianying, Wang Kun, Zhang Yuanying, Li Hui, Tan Xiaodi
Opt Express. 2020 Jan 6;28(1):511-518. doi: 10.1364/OE.380365.
A novel frequency expanded non-interferometric phase retrieval method for holographic data storage is proposed. The limitation of twice Nyquist frequency for phase retrieval with high fidelity is broken through. Only 1 times Nyquist size frequency of the hologram is recorded, reconstructed and detected in our method which is the smallest range for complex multi-level phase retrieval in the current holographic data storage report. Required high-order frequencies for quick phase retrieval are generated artificially by expanding 1 times Nyquist frequency to high-order frequencies with utilizations of frequency periodicity. Therefore, our proposed method can increase storage density due to reducing the recording consumption of media and decreasing the recording area by 4 times compared with twice Nyquist frequency recording.
提出了一种用于全息数据存储的新型频率扩展非干涉相位检索方法。突破了高保真相位检索两倍奈奎斯特频率的限制。在我们的方法中，仅记录、重建和检测全息图的1倍奈奎斯特尺寸频率，这是当前全息数据存储报告中复杂多级相位检索的最小范围。利用频率周期性将1倍奈奎斯特频率扩展到高阶频率，人为生成快速相位检索所需的高阶频率。因此，与两倍奈奎斯特频率记录相比，我们提出的方法可以通过减少介质的记录消耗并将记录面积减小4倍来提高存储密度。
