CMI（相干调制成像）

张福才等人提出了一种基于波前调制的CDI 方案[1-2]，亦称相干调制成像(Coherent Modulation Imaging，CMI)[3]。通过在传统CDI成像结构中引入已知的调制器信息（如下图所示），使得相位恢复算法可以快速收敛，迅速消除模糊解问题。CMI方法显示了很好的收敛性和鲁棒性，并且适用于扩展性样品，可用于高功率激光器的波前在线诊断[4]、脉冲光束测量[5]和光学元件检测[6]，在针对动态过程的研究中也具有巨大的潜力[7]。

CMI系统结构原理示意图

[1] Zhang F, Pedrini G, Osten W. Phase retrieval of arbitrary complex-valued fields through aperture-plane modulation[J]. Physical Review A, 2007, 75(4): 043805.

[2] Zhang F, Rodenburg J M. Phase retrieval based on wave-front relay and modulation[J]. Physical Review B, 2010, 82(12): 121104.

[3] Zhang F, Chen B, Morrison G R, et al. Phase retrieval by coherent modulation imaging[J]. Nature Communications, 2016, 7(1): 1-8.

[4] He X, Tao H, Pan X, et al. High-quality laser beam diagnostics using modified coherent phase modulation imaging[J]. Optics Express, 2018, 26(5): 6239-6248.

[5] Pan X, Veetil S P, Liu C, et al. On-shot laser beam diagnostics for high-power laser facility with phase modulation imaging[J]. Laser Physics Letters, 2016, 13(5): 055001.

[6] Tao H, Veetil S P, Cheng J, et al. Measurement of the complex transmittance of large optical elements with modulation coherent imaging[J]. Applied Optics, 2015, 54(7): 1776-1781.

[7] Zhang J, Yang D, Tao Y, et al. Spatiotemporal coherent modulation imaging for dynamic quantitative phase and amplitude microscopy[J]. Optics Express, 2021, 29(23): 38451-38464.