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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 17299–17308

Focusing polychromatic light through strongly scattering media

Hari P. Paudel, Chris Stockbridge, Jerome Mertz, and Thomas Bifano  »View Author Affiliations

Optics Express, Vol. 21, Issue 14, pp. 17299-17308 (2013)

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We demonstrate feedback-optimized focusing of spatially coherent polychromatic light after transmission through strongly scattering media, and describe the relationship between optimized focus intensity and initial far-field speckle contrast. Optimization is performed using a MEMS spatial light modulator with camera-based or spectrometer-based feedback. We observe that the spectral bandwidth of the optimized focus depends on characteristics of the feedback signal. We interpret this dependence as a modification in the number of independent frequency components, or spectral correlations, transmitted by the sample, and introduce a simple model for polychromatic focus enhancement that is corroborated by experiment with calibrated samples.

© 2013 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(290.1990) Scattering : Diffusion
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media

ToC Category:

Original Manuscript: March 8, 2013
Revised Manuscript: May 7, 2013
Manuscript Accepted: May 7, 2013
Published: July 12, 2013

Virtual Issues
Vol. 8, Iss. 8 Virtual Journal for Biomedical Optics

Hari P. Paudel, Chris Stockbridge, Jerome Mertz, and Thomas Bifano, "Focusing polychromatic light through strongly scattering media," Opt. Express 21, 17299-17308 (2013)

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