Abstract
Er3+/Yb3+:Ca9Y(VO4)7 crystal with dimensions of Ø 20×25mm2 was grown successfully by the Czochralski method. Its thermal and spectral properties were investigated in detail. The thermal expansion coefficients are 1.39×10−5K−1 and 1.63×10−5K−1 along a-axis and c-axis, respectively. The thermal conductivity is about 1W/(mK) at room temperature. The absorption bands near 980nm have a full-width at half-maximum of 37nm and 26nm for σ- and π-polarization, respectively. The fluorescence lifetime of the 4I13/2 level of Er3+ is 4.12ms. The emission cross sections calculated by the Füchtbauer–Ladenburg method at 1533nm are 1.58×10−20cm2 and 1.57×10−20cm2 for σ- and π-polarization, respectively. The results indicate that Er3+/Yb3+:Ca9Y(VO4)7 crystal is a potential 1.5–1.6μm laser material.
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