The application of spatially resolved measurements of fluorescence intensity to the determination of diffusion profiles, in this case of neodymium ions into lithium niobate, and to the concentration dependence of the fluorescence lifetime is discussed. The technique permits a precise determination of diffusion depth, but extraction of detailed point-by-point concentration measurements is not possible. A detailed analysis of the effect on the accuracy of the method of systematic uncertainties, including quantum electrodynamical corrections and concentration-dependent lifetimes, is given. The overall systematic error in measurement of diffusion coefficient is shown to be approximately 10%. The diffusion coefficients measured are consistent with previous values, but the fluorescence lifetimes obtained are probably shorter than for bulk-doped Nd:LiNbO3.
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M. Hempstead (1993) studied this question.
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