基于自协方差分析和正交矩形多项式的数字光相位共轭系统的高速对准优化。

California Institute of Technology, Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Depa, United States.

California Institute of Technology, Caltech Optical Imaging Laboratory, Department of Electrical Eng, United States.

J Biomed Opt. 2018 Aug;24(3):1-11. doi: 10.1117/1.JBO.24.3.031004.

Digital optical phase conjugation (DOPC) enables many optical applications by permitting focusing of light through scattering media. However, DOPC systems require precise alignment of all optical components, particularly of the spatial light modulator (SLM) and camera, in order to accurately record the wavefront and perform playback through the use of time-reversal symmetry. We present a digital compensation technique to optimize the alignment of the SLM in five degrees of freedom, permitting focusing through thick scattering media with a thickness of 5 mm and transport scattering coefficient of 2.5 mm - 1 while simultaneously improving focal quality, as quantified by the peak-to-background ratio, by several orders of magnitude over an unoptimized alignment.

数字光相位共轭（DOPC）通过允许光通过散射介质聚焦，从而实现了许多光学应用。然而，DOPC 系统需要所有光学组件，特别是空间光调制器（SLM）和相机的精确对准，以便通过使用时间反转对称性准确地记录波前并进行回放。我们提出了一种数字补偿技术，可优化 SLM 的五个自由度的对准，从而可以在厚度为 5mm、传输散射系数为 2.5mm-1 的厚散射介质中进行聚焦，同时通过几个数量级提高焦点质量，如通过峰值与背景比来量化的，与未优化的对准相比。