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We report on the nonlinear (NL) optical absorption of glass ceramics containing sodium niobate (NaNbO₃) nanocrystals measured with nanosecond lasers. The NL absorption behavior, associated with samples with different volume fractions occupied by the NaNbO₃ nanocrystals, was studied using lasers operating at 532, 580, and 6100.3em0exnm. The intensity response of the samples was understood taking into account the contributions of two-photon absorption (TPA) and excited state absorption (ESA) due to free carriers and electron trapping states. Values for the TPA coefficients and the ESA cross sections were obtained for different samples and excitation wavelengths.
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Oliveira et al. (2007) studied this question.
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