Polarization-dependent nonlinear absorption of Co2+ centers in MgAl2O4 spinel

Yu Wang; Weichong Wu; Zhanda Zhu; Yongling Hui; Hong Lei; Qiang Li

doi:10.1117/12.2634378

12 May 2022 Polarization-dependent nonlinear absorption of Co²⁺ centers in MgAl₂O₄ spinel

Yu Wang, Weichong Wu, Zhanda Zhu, Yongling Hui, Hong Lei, Qiang Li

Proceedings Volume 12173, International Conference on Optics and Machine Vision (ICOMV 2022); 121730E (2022) https://doi.org/10.1117/12.2634378
Event: International Conference on Optics and Machine Vision (ICOMV 2022), 2022, Guangzhou, China

Abstract

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 O^2- 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.

Citation Download Citation

Yu Wang, Weichong Wu, Zhanda Zhu, Yongling Hui, Hong Lei, and Qiang Li "Polarization-dependent nonlinear absorption of Co²⁺ centers in MgAl₂O₄ spinel", Proc. SPIE 12173, International Conference on Optics and Machine Vision (ICOMV 2022), 121730E (12 May 2022); https://doi.org/10.1117/12.2634378

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