Abstract
Y3Al5O12 (YAG) single crystals doped with a fixed Ho3+ content of 0.5 at.% and various Yb3+ contents (Yb = 5, 10 and 15 at.%) have been successfully grown by the micro-pulling-down (μ-PD) method. The absorption spectra, fluorescence spectra and fluorescence decay curves were recorded at room temperature. The intense emission of Yb,Ho:YAG crystal centered at 2 μm corresponds to the 5I7 → 5I8 transition. Three intense emissions centered at 524–569 nm, 623–691 nm and 744–746 nm, correspond to the 5F4 + 5S2 → 5I8, 5F5 → 5I8 and 5F4 + 5S2 → 5I7 transitions, respectively. The possible energy transfer mechanisms were discussed intensively.
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