Properties of a diffused photon-pair density wave in a multiple-scattering medium

摘要

A novel diffused photon-pair density wave (DPPDW) composed of correlated polarized photon pairs at different temporal frequencies and orthogonal linearly polarized states is proposed. A theory of DPPDWs is developed. A DPPDW selected by coherence gating and polarization gating that satisfies the diffusion equation has been verified experimentally. The sensitivity of amplitude and phase detection of the heterodyne signal has been improved by the properties of synchronized detection and common-path propagation of polarized pair photons in a multiple-scattering medium. Both reduced scattering coefficient μ_(2s)~(′) and absorption coefficient μ_(2a)of the scattering medium in terms of the measured phase and amplitude of the heterodyne signal have been obtained. The detection sensitivity of μ_(2s)~(′) and μ_(2a) and the properties of a DPPDW in a multiple-scattering medium are discussed and analyzed.