Abstract
Abstract Optical spectroscopy of the green emission of erbium in KGd(WO4)2 (KGW) single crystals codoped with ytterbium ions is investigated. To do this, we firstly grew good-optical-quality KGW single crystals doped with Er3+ and Yb3+ at several dopant concentrations by the Top-seeded-solution-growth slow-cooling method (TSSG). Green photoluminescence of Er3+ in KGW host was studied at room temperature (RT) and low temperature (10 K) by means of Yb3+ sensitization after infrared excitation at 981 nm (10194 cm−1). We calculated the emission and gain cross-sections and compared these with those of other known Er3+-doped laser materials like LiYF4 :Er (YLF:Er) and Y3Al5O12:Er (YAG:Er) at RT. Our study also focused on determining the optimal concentration of ions for generating the most intense green emission. We measured the lifetime of the green emission after infrared pump at several Yb3+ concentrations. From the low-temperature emission experiments, we determined the energy position of the sublevels of the ground state of erbium.
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