Abstract
The high quality of different holmium doping concentration calcium fluoride (Ho: CaF2) transparent ceramics were fabricated by hot-pressing method, which average transmittance reached to 83% at 1200 nm. The effect of Ho3+ concentrations on structural and spectroscopic properties of Ho: CaF2 transparent ceramics were investigated. With the increase of the Ho3+ ions doping concentration, the grain size of nanopowders decreased and the grain size of ceramics decreased first and then increased. The absorption coefficient of the Ho: CaF2 increased with the increase of doping concentrations. Emission and absorption cross sections of the 5I7 energy level of Ho3+ in CaF2 transparent ceramics were investigated. A strong intensity of emission peak at 2030 nm was observed, the fluorescence lifetime at 2030 nm was also investigated which indicating that Ho:CaF2 transparent ceramic is a potential candidate for 2.0 μm laser emission materials.
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