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The spectroscopic properties of SrLaGaO 4 (SLO) crystal doped with Ho 3+ ions were studied in this work. Absorption, emission spectra and decay dynamics of excited states have been measured and discussed using the Judd-Ofelt model. Photoluminescence emissions were attributed to transitions from the excited 3 D 3 , 5 S 2 , 5 F 5 , 5 I 6 and 5 I 7 multiplet manifolds. The experimental lifetimes for five excited states have been compared to the theoretical values, calculated using Judd-Ofelt theory, allowing for the determination of the multiphonon relaxation rates (W nR ) of the respective states. The experimental data were approximately on a line expressed by W nR = W 0 exp(-αΔE) with W 0 = 0.5 × 10 7 s -1 and α = 2.6 × 10 -3 cm. To discuss the excited state absorption (ESA) pathways, that originated from several excited levels, we used the Judd-Ofelt formalism allowing determination of the integrated cross section for ESA transitions.

Optical Transitions and Excited State Absorption Cross Sections of SrLaGaO4 Doped with Ho3+ Ions