基于 Ma t l a b牛顿环实验的仿真研究

根据光的干涉理论, 改变牛顿环实验参数, 分析干涉条纹的疏密程度, 采用 Ma t l a b编程, 有效地观测光 强分布情况. 可将抽象的光学规律直观化, 弥补实验条件的局限性, 与真实牛顿环实验相结合, 加深学生对等厚干涉 现象的理解     

Four-level phase pair encoding and decoding with single interferometric phase retrieval for holographic data storage

We propose four-level phase pair encoding and decoding with single interferometric phase retrieval for holographic data storage. Inherent with phase pair encoding, phase shifting is generated by assigning a certain phase difference between two pixels of the phase pair. Multiple phase shifting operations are not required. In addition, a phase-readout reference beam can be a plane beam with an arbitrary phase in our method because phase shifting can be encoded on the phase-only spatial light modulator easily and accurately. Therefore, our method can not only increase the data transfer rate, but also improve the robustness of the holographic data storage system.Although the code rate of our method needs to be sacrificed by half, the code rate is still twice that of amplitude code when four-level phase encoding is used. We demonstrated experimentally that there is only a 1 × 10~(-2) order of bit error rate before error correcting, which is acceptable. We believe our method will further advance the phase-modulated holographic data storage technique.