Appl Opt. 2020 Aug 1;59(22):G234-G238. doi: 10.1364/AO.391941.
Wavefront coding is a technique that combines optical phase elements and digital signal processing in order to increase the effective depth of focus of optical systems. The success of wavefront coding lies in the design of a suitable phase mask placed at the system's aperture. This element allows for image formation invariant under the effects of different second-order optical aberrations. In optical systems limited by temporally or spatially varying high-order aberrations, the use of wavefront coding has not been fully demonstrated. Here we propose the choice of Jacobi-Fourier shaped phase masks to produce sharp and clear retinal images of living eyes. To demonstrate the potential use of the technique, we analyze the performance of the Jacobi-Fourier phase masks through experimental simulations to alleviate aberrations for different eye aberrations. We will show that the best mask choice is robust to noise while keeping acceptable resolution and reducing image artefacts.
波前编码是一种将光学相位元件和数字信号处理相结合的技术，旨在增加光学系统的有效景深。波前编码的成功在于设计一个合适的相位掩模，放置在系统的孔径处。这个元件允许在不同的二阶像差的影响下对图像进行形成不变的操作。在受时间或空间变化的高阶像差限制的光学系统中，波前编码的使用尚未得到充分证明。在这里，我们选择了雅克比-傅里叶形状的相位掩模，以产生活体眼睛的清晰视网膜图像。为了展示该技术的潜在用途，我们通过实验模拟分析了雅克比-傅里叶相位掩模的性能，以减轻不同眼睛像差的像差。我们将表明，最佳掩模选择对噪声具有鲁棒性，同时保持可接受的分辨率并减少图像伪影。
