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Opt Express. 2012 Jan 16;20(2):1733-40. doi: 10.1364/OE.20.001733.

High-speed scattering medium characterization with application to focusing light through turbid media.

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Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, USA.


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.

[Indexed for MEDLINE]

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