Abstract

Absorption and luminescence spectra of Ho³⁺ in Lu₃Al₅O₁₂ (LuAG) have been measured in the 0.3–2.2-μm wavelength region at various temperatures between 8 K and room temperature. The energy levels of the ground state ⁵I₈ and the first excited state ⁵I₇ have been determined by using these data. Luminescence spectra have been obtained by exciting Ho³⁺ into several upper manifolds, such as ⁵S₂ and ⁵F₅. In determining the energy levels of ⁵I₇, emission transitions that terminate in the ⁵I₇ manifold and absorption transitions that terminate in the ⁵I₇ manifold were matched. These experimental energy levels of Ho³⁺ in LuAG were compared with results obtained by theoretical calculations.¹ A comparison of experimental results between LuAG and YAG has also been made for these manifolds.²

© 1994 Optical Society of America