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.
© 2011 Optical Society of America
Original Manuscript: October 6, 2010
Revised Manuscript: December 23, 2010
Manuscript Accepted: December 29, 2010
Published: January 27, 2011
Vol. 6, Iss. 3 Virtual Journal for Biomedical Optics
Frerik van Beijnum, Elbert G. van Putten, Ad Lagendijk, and Allard P. Mosk, "Frequency bandwidth of light focused through turbid media," Opt. Lett. 36, 373-375 (2011)