Frequency bandwidth of light focused through turbid media

We study the effect of frequency detuning on light focused through turbid media. By shaping the wavefront of the incident beam light is focused through an opaque scattering layer. When detuning the laser we observe a gradual decrease of the focus intensity, while the position, size,and shape of the...

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Bibliographic Details
Published in:Optics letters 2011-02, Vol.36 (3), p.373-375
Main Authors: VAN BEIJNUM, Frerik, VAN PUTTEN, Elbert G, LAGENDIJK, Ad, MOSK, Allard P
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
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Summary:We study the effect of frequency detuning on light focused through turbid media. By shaping the wavefront of the incident beam light is focused through an opaque scattering layer. When detuning the laser we observe a gradual decrease of the focus intensity, while the position, size,and shape of the focus remain the same within experimental accuracy. The frequency dependence of the focus intensity follows a measured speckle correlation function. We support our experimental findings with calculations based on transport theory. Our results imply wavefront shaping methods can be generalized to allow focusing of optical pulses in turbid media.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.36.000373