The nonlinear transmission curves of the : crystal at 1.5 µm are experimentally measured by the pump-probe technique. The measurement results demonstrate that the transition into the near-infrared absorption band is polarized not only along the local symmetry axis, but also along the direction perpendicular to the axis, arising from the distortion of oxygen tetrahedrons about the ions along the four local symmetry axes. The obtained saturation curves are analyzed using a theoretical model taking into account the transition of ions along two orthogonal directions. The ground-state absorption cross sections for polarization parallel and perpendicular to the axis are calculated to be 3.4×10 and 2.6×10, respectively. The excited-state absorption cross section for polarization parallel to the axis is estimated to be4.2×10.
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