Abstract
Optical-grating experiments have been shown to be a powerful probe of carrier diffusion.1 In these experiments two beams interfere in a material, forming a grating that is probed by a third beam. The. decay of the optically created population grating occurs through many channels, such as recombination γrec and spatial diffusion. For diffusion independent of position and concentration, the decay due to spatial diffusion is governed by Pick's Law and the diffusion coefficient D is extracted by measuring the grating decay Γ versus the grating spacing Λ, with Γ = γrec + (4π2D/Λ2).
© 1995 Optical Society of America
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