Abstract
SrF2 transparent ceramics are frequently utilized as gain materials for solid-state lasers because of their excellent optical properties. In this paper, 5 at.% Er3+: SrF2 nanoparticles were synthesized by chemical coprecipination method, and 5 at.% Er3+: SrF2 transparent ceramics were prepared in one step by cold sintering process, and their microstructure and optical properties were studied. The results indicate that Er3+:SrF2 transparent ceramics prepared at 300 °C and 468 MPa exhibit a dense structure, uniform particle size, and excellent transmittance. The average visible range transmittance of the sample is 48.59%, while the transmittance at 1100 nm reaches up to 76.94%. Moreover, this sintering process requires a temperature that is lower by as much as 500 °C compared to traditional methods. In addition, green emission (about 540 nm) and red emission (about 660 nm) of 2H11/2、4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions were observed in the visible range of the 375 nm laser excitation. It provides a novel and green idea for the preparation of Er: SrF2 transparent ceramics at ultra-low temperature.
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