SCATTERING AND WAVELENGTH TRANSDUCTION OF DIFFUSE PHOTON DENSITY WAVES

Experiments are performed that illustrate the scattering and reradiati on of damped traveling waves of light energy density from objects with in otherwise homogeneous turbid media. We demonstrate that simple diff ractive and refractive models can be used to understand the scattering of these waves by absorptive and dispersive spheres. Furthermore, usi ng a fluorescent dye we can reestablish the origin of the diffuse phot on density waves, by converting from one optical and diffusive wavelen gth to another while maintaining phase coherence. The possibilities fo r precise medical imaging are presented.