Two-frequency radiative transfer and asymptotic solution
JOSA A, Vol. 24, Issue 8, pp. 2248-2256 (2007)
http://dx.doi.org/10.1364/JOSAA.24.002248
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Abstract
Two-frequency radiative transfer (2f-RT) theory is developed for classical waves in random media. Depending on the ratio of the wavelength to the scale of medium fluctuation, the 2f-RT equation is either a Boltzmann-like integral equation with a complex-valued kernel or a Fokker–Planck-like differential equation with complex-valued coefficients in the phase space. The 2f-RT equation is used to estimate three physical parameters: the spatial spread, the coherence length, and the coherence bandwidth (Thouless frequency). A closed-form solution is given for the boundary layer behavior of geometrical radiative transfer and shows highly nontrivial dependence of mutual coherence on the spatial displacement and frequency difference. It is shown that the paraxial form of 2f-RT arises naturally in anisotropic media that fluctuate slowly in the longitudinal direction.
© 2007 Optical Society of America
OCIS Codes
(030.5620) Coherence and statistical optics : Radiative transfer
(290.4210) Scattering : Multiple scattering
ToC Category:
Coherence and Statistical Optics
History
Original Manuscript: October 20, 2006
Revised Manuscript: February 8, 2007
Manuscript Accepted: February 16, 2007
Published: July 11, 2007
Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics
Citation
Albert C. Fannjiang, "Two-frequency radiative transfer and asymptotic solution," J. Opt. Soc. Am. A 24, 2248-2256 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-24-8-2248
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