Abstract: We perform experiments which confirm the existence of diffuse photon density waves in homogeneous diffusive media and show that these waves obey some simple principles of optics. In particular, experiments are done to show that Snell's law holds for waves moving across a boundary between media of different diffusional indices of refraction. Other experiments are performed which investigate the scattering of these waves from spherical objects, and simple models are presented to explain these results. Finally we demonstrate that it is possible to excite a fluorescent object with a diffuse photon density wave, creating a transduced diffuse photon density wave with a different wavelength. In summary we discuss the implications of these results for medical imaging. !9
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