基于高速相位调制的菲涅耳场相位恢复

多强度相位恢复方法通过改变光学成像系统中的物理参数获得不同的编码衍射图案，实现相位的最佳收敛和高精度重建，无需额外的先验知识等优点；但现有多强度相位恢复方法在获取不同测量的过程中，往往需要不断改变成像系统的物理结构，从而导致成像结构较为复杂，需要精确移动或调整部分光学元件的空间位置，反复地对齐与校准，显著增加了相应的工作量。针对上述问题，本文提出基于高速相位调制的菲涅耳场相位恢复方法，该方法主要使用两种纯相位空间光调制器(电可调透镜/纯相位型硅基液晶)来进行相位的快速动态调制，然后通过自由空间传播到记录平面，被探测器所获取强度信息，不需要透镜装置或者改变成像系统的物理结构，使得成像结构更为紧凑和简单，避免了反复对齐与校准的过程；在重建阶段使用WF算法从获取的多幅编码衍射图案中同时重建光场的振幅和相位。仿真实验验证了本文方法的有效性和鲁棒性。本文方法的成像结构更为紧凑和简单，避免了反复对齐与校准的工作量，具有重要的应用潜力，尤其是电可调透镜调制方案，可适用于高分辨率场景的高速记录。

Fresnel Field Phase Retrieval via High-speed Phase Modulation

The multi-intensity phase retrieval method can obtain different coded diffraction patterns by changing the physical parameters in the optical imaging system, which can achieve the best convergence of phase and high-precision reconstruction without additional prior knowledge. However, in the process of obtaining different measurements, the existing multi-intensity phase recovery methods often need to constantly change the physical structure of the imaging system, resulting in a more complex imaging structure, which requires accurate movement or adjustment of the spatial position of part of the optical elements, repeated alignment and calibration, significantly increasing the corresponding workload. According to the above problem, this paper proposes a Fresnel field phase recovery method based on high-speed phase modulation. This method mainly uses two pure phase spatial light modulators (electrically adjustable lens / pure phase silicon-based liquid crystal) to quickly and dynamically modulate the phase, and then propagates to the recording plane through free space. The intensity information is obtained by the detector without lens device or changing the physical structure of the imaging system, The imaging structure is more compact and simple, and the process of repeated alignment and calibration is avoided; In the reconstruction stage, WF algorithm is used to reconstruct the amplitude and phase of the optical field from the obtained multiple coded diffraction patterns simultaneously. Simulation results demonstrate the effectiveness and robustness of the proposed method. The imaging structure of the proposed method is more compact and simple, and the workload of repeated alignment and calibration is avoided. Therefore, it has important application potential, especially the electrically adjustable lens modulation scheme, which can be applied to high-speed recording of high-resolution scenes.