Open AccessHigh-speed scattering medium characterization with application to focusing light through turbid media
Author(s) -
Donald B. Conkey,
Antonio M. Caravaca-Aguirre,
Rafael Piestun
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.001733
Subject(s) - optics , holography , wavefront , speckle pattern , scattering , transmission (telecommunications) , focus (optics) , light scattering , decorrelation , phase conjugation , phase (matter) , physics , computer science , laser , telecommunications , quantum mechanics , algorithm
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.