Abstract

Nonlinear refraction spectroscopy has been performed in ${\mathrm{Yb}}^{3+}$-doped phosphate glass to determinate the line shape of real and imaginary parts of $n_2$ $(n_2^{\prime }$ and $n_2^{″}$). The $n_2^{\prime }$ spectrum presented an asymmetric feature due to the interference of resonant and nonresonant contributions, where the nonresonant term arises from the polarizability difference between excited and ground states $\left(\mathrm{\Delta }\alpha \right)$. The measurements were performed in the transient regime to determine population dynamics and the pump saturation intensity at $975\mathrm{nm}$ (peak of the absorption spectrum). Because of the small quantum defect of ${\mathrm{Yb}}^{3+}$, we estimated that the magnitude of the thermal lens effect is $\sim 20$ times smaller than the population lens effect, caused by $n_2$.

© 2007 Optical Society of America

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