Recent advances in computational wavefront shaping have made optical focusing through scattering media a reality. However, most current techniques are too slow to focus, much less image through dynamically changing living biological tissue, such as blood-perfused neural networks, which can decorrelate in milliseconds. We introduce a phase control technique using programmable acoustic optic deflectors (AODs) that is orders of magnitude faster than existing wavefront shaping methods. It is based on sending an array of RF-encoded beams through the medium and measuring the phases of all scattered beams simultaneously with a fast single-pixel detector in just 10 μs. Using the AODs, we then phase conjugate the beams to form a spatio-temporal focus. We also demonstrate two-dimensional scanning of the focus on a sub-millisecond time scale.

中文翻译：

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在微秒内聚焦并扫描散射介质

计算波前整形的最新进展已使通过散射介质进行光学聚焦成为现实。但是，大多数当前技术太慢而无法聚焦，通过动态变化的生物组织（例如血液灌注的神经网络）可减少图像，而这些神经网络可在几毫秒内完成去相关。我们介绍一种使用可编程声光偏转器（AOD）的相位控制技术，该技术比现有的波阵面整形方法快几个数量级。它基于通过介质发送一系列RF编码光束并使用快速单像素检测器在10 µs内同时测量所有散射光束的相位。然后，使用AOD，对光束进行相位共轭以形成时空聚焦。我们还演示了在亚毫秒级时标上的二维扫描。