Abstract
The spectroscopic properties of SrLaGaO4 (SLO) crystal doped with Ho3+ 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 3D3, 5S2, 5F5, 5I6 and 5I7 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 (WnR) of the respective states. The experimental data were approximately on a line expressed by WnR = W0 exp(−αΔE) with W0 = 0.5 × 107 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.
Highlights
The strontium lanthanum gallate SrLaGaO4 (SLO) and its solid solutions have been extensively investigated since they were considered as a promising substrate for high temperature superconducting (HTSc) films [1]
The structure makes SrLaGaO4 uniaxially anisotropic where the strength of the abThe structure makes SrLaGaO4 uniaxially anisotropic where the strength of the absorption lines is dependent on the direction of the incident light
The spectroscopy and the fluorescence dynamics of SrLaGaO4 crystal doped with Ho3+
Summary
The strontium lanthanum gallate SrLaGaO4 (SLO) and its solid solutions have been extensively investigated since they were considered as a promising substrate for high temperature superconducting (HTSc) films [1]. The interest in studying RE3+ doped SLO strongly results both from its structural disorder, and the resulting inhomogeneous broadening of the optical transitions [6], as well as from the ability of this matrix to accept high concentrations of activator [1,2]. Such a broadening helps the generation of ultrashort pulses by mode locking. The Ho ion is very suitable levels, fromprocesses which ESA can take place resulting in a strong, green anti-Stokes formetastable use in up-conversion because it has many long-lived intermediate metasta.
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