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Parallel wavefront optimization method for focusing light through random scattering media

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Abstract

A parallel wavefront optimization method is demonstrated experimentally to focus light through random scattering media. The simultaneous modulation of multiple phase elements, each at a unique frequency, enables a parallel determination of the optimal wavefront. Compared to a pixel-by-pixel measurement, the reported parallel method uses the target signal in a highly efficient way. With 441 phase elements, a high-quality focus was formed through a glass diffuser with a peak-to-background ratio of 270. The accuracy and repeatability of the system were tested through experiments.

© 2011 Optical Society of America

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