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Increasing the enhancement factor for DMD-based wavefront shaping

机译:增加基于DMD的波前塑造的增强因子

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Focusing through scattering media is a subject of great interest due to its direct impact in the field of biomedical optics. However, the greatest barrier currently limiting direct applications is the fact that most scattering media that we wish to deliver light through are dynamic. To focus or deliver light through dynamic scattering media, using a digital micromirror device (DMD) has been demonstrated to be a potential solution, as it enables fast modulation speeds. However, since a DMD is a binary amplitude modulator, the large number of controlled modes needed to acquire adequate focus enhancement has limited optimal usage. Here we demonstrate a novel (to the best of our knowledge) scheme to use the "thrown-away" components of light to effectively use a binary amplitude DMD as a binary phase modulator, thereby increasing the correction efficiency by a factor of two. Our concept can be applied to any iterative optimization algorithm and can speed up the iterative optimization process by increasing the enhancement factor, rather than the measurement or modulation speeds. (C) 2020 Optical Society of America
机译:由于其在生物医学光学领域的直接影响,聚焦通过散射介质是一种极其兴趣的主题。然而,目前限制直接申请的最大障碍是我们希望通过透光的大多数散射媒体是动态的。通过动态散射介质对焦或传递光,已经证明使用数字微镜装置(DMD)是潜在的解决方案,因为它可以实现快速调制速度。然而,由于DMD是二进制幅度调制器,所以获得足够焦点增强所需的大量受控模式具有有限的最佳用途。在这里,我们展示了一种新颖的(据我们所知)方案来使用光的“抛出”分量以有效地使用二进制幅度DMD作为二进制相位调制器,从而将校正效率提高了两倍。我们的概念可以应用于任何迭代优化算法,并且可以通过增加增强因子而不是测量或调制速度来加速迭代优化过程。 (c)2020美国光学学会

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