Abstract
A method is introduced that measures the spatial-migration rate of electronic excitation in condensed media over distances of the order of 0.1 μm. Two volume holographic gratings of widely differing modulation periods are simultaneously produced, using a phase-conjugate wave geometry of degenerate four-wave mixing. Spatial migration results in a reduced scattering efficiency of one grating and is observed as a polarization rotation of the backward-going output wave. Upper limits are placed on the diffusion constants in pink ruby and Nd3+-doped silicate glass.
© 1979 Optical Society of America
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