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9 May 2014 Measurement of energy transfer upconversion in Nd:YAG via the z-scan technique
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We present the determination of the energy transfer upconversion (ETU) coefficient for Nd:YAG via the z-scan technique, achieved by studying the irradiance dependence of the transmission of a pump laser tuned to the absorption peak around 808 nm. A spatially dependent two-level rate equation model has been utilized to predict the transmission dependence as a function of the sample’s position in the z-scan experiment, with the ETU coefficient the only free parameter. Comparing experimental results with the model’s output, the ETU coefficient for 1 at.% Nd:YAG is determined to be 5.1 ± 0.4 x 10-17 cm3/s.
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R. P. Yan, S. J. Yoon, S. J. Beecher, and J. I. Mackenzie "Measurement of energy transfer upconversion in Nd:YAG via the z-scan technique", Proc. SPIE 9135, Laser Sources and Applications II, 913525 (9 May 2014);

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