Determination of upper limits for spatial energy diffusion in ruby

Abstract
Direct measurements of the diffusion distance of E¯(E2) state excitation by time-resolved degenerate four-wave mixing in ruby are reported. Measurements are made on crystals with Cr3+ concentrations varying between 0.05 and 1.55 at.% at 10°K. In all cases an upper limit of 30 nm is determined for the diffusion distance within the fluorescence lifetime.

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