Abstract
The spectral parameters of Er3+ in Yb3+/Er3+: KY(WO4)2 crystal with space group C2/c have been investigated based on Judd-Ofelt theory. The spectral parameters were obtained: the intensity parameters Ωλ are: Ω2 = 6.33 × 10−20 cm2, Ω4 = 1.35 × 10−20 cm2, Ω6 = 1.90 × 10−20 cm2. The radiative lifetime and the fluorescence branch ratios were calculated. The emission cross section σe (at 1536 nm) is 2.0 × 10−21 cm2.
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