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The luminescent quantum efficiency of Yb(3+) ions in lithium niobate (LiNbO(3)) is obtained by use of a method based on the simultaneous and multiwavelength measurement of photoacoustic and luminescent signals after modulated continuous laser excitation. The experimental results give a high value for the luminescence quantum efficiency (? = 0.90 ? 0.05), coincident with the predictions by the comparison between experimental and estimated radiative lifetimes.
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Muñoz et al. (1998) studied this question.
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