Judd–Ofelt analysis of spectroscopic properties of Eu3+:KLu(WO4)2 crystal

We report on a comprehensive spectroscopic study of monoclinic Eu:KLu(WO4)2 crystal concerning its potential applications in red lasers. Optical absorption and stimulated-emission cross-section spectra are determined for this crystal for the principal light polarizations, E || Np, Nm and Ng. The maximum σSE corresponding to the 5D0→7F4 transition is 1.78×10−20 cm2 at 703.5 nm (for E || Nm). Spectroscopic properties of Eu:KLu(WO4)2 are modeled within the conventional Judd–Ofelt theory, as well as its modification for systems with an anomalously strong configuration interaction (ASCI), yielding absorption oscillator strengths, luminescence branching ratios for 5DJ→7FJ' transitions and radiative lifetimes of the 5DJ states. Photoluminescent properties of Eu:KLu(WO4)2 are studied under UV/visible excitation. Polarized Raman spectra are measured for Eu:KLu(WO4)2.