Conkey Donald B, Caravaca-Aguirre Antonio M, Piestun Rafael
Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, USA.
Opt Express. 2012 Jan 16;20(2):1733-40. doi: 10.1364/OE.20.001733.
We introduce a phase-control holographic technique to characterize scattering media with the purpose of focusing light through it. The system generates computer-generated holograms implemented via a deformable mirror device (DMD) based on micro-electro-mechanical technology. The DMD can be updated at high data rates, enabling high speed wavefront measurements using the transmission matrix method. The transmission matrix of a scattering material determines the hologram required for focusing through the scatterer. We demonstrate this technique measuring a transmission matrix with 256 input modes and a single output mode in 33.8 ms and creating a focus with a signal to background ratio of 160. We also demonstrate focusing through a temporally dynamic, strongly scattering sample with short speckle decorrelation times.
我们引入一种相位控制全息技术来表征散射介质，目的是使光聚焦通过该介质。该系统生成基于微机电技术的可变形镜装置（DMD）实现的计算机生成全息图。DMD可以以高数据速率更新，从而能够使用传输矩阵法进行高速波前测量。散射材料的传输矩阵决定了聚焦通过散射体所需的全息图。我们展示了这种技术，在33.8毫秒内测量了具有256个输入模式和单个输出模式的传输矩阵，并创建了一个信号与背景比为160的焦点。我们还展示了通过具有短散斑去相关时间的时间动态、强散射样本进行聚焦。
