Polarization-dependent nonlinear absorption in the Co2+:MgAl2O4 crystal was investigated by the pump-probe technique. The nonlinear transmission curves of the [100]-cut Co2+:MgAl2O4 crystal for the linear polarized probe light were measured experimentally, when the crystal was excited by a linear polarized pump light. The measurement results showed that the transition into the near-infrared (NIR) absorption band was not only polarized along the C3 local symmetry axis, but also along the direction perpendicular to the C3 axis. And the absorption intensity of the latter transition was much weaker than the former. The structural model of Co2+ centers in the MgAl2O4 crystal, in which the Co2+ ion and surrounding O2- ions formed a tetrahedron deformed along the C3 local symmetry axis, was proposed. This structural model allowed us to explain the anisotropy of nonlinear absorption in the Co2+:MgAl2O4 crystal.
Polarization-dependent nonlinear absorption in the Co2+:MgAl2O4 crystal was investigated by the pump-probe technique. The nonlinear transmittance curves of the [100]-cut Co2+:MgAl2O4 crystal for the linear polarized probe light were measured experimentally, when the crystal was excited by a linear polarized pump light. The measurement results showed that the transition into the near-infrared (NIR) absorption band was not only polarized along the C3 local symmetry axis, but also along the direction perpendicular to the C3 axis. And the absorption intensity of the latter transition was much weaker than the former. The structural model of Co2+ centers in the MgAl2O4 crystal was proposed, in which the Co2+ ion and surrounding O2- ions formed a tetrahedron deformed along the C3 local symmetry axis. This structural model allowed us to explain the anisotropy of nonlinear absorption in the Co2+:MgAl2O4 crystal.
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