Abstract
The effect of erbium concentration on spectroscopic properties of Er:CaF2 crystals was investigated. Two highest absorption cross-sections (σabs) at 967 nm were achieved in the 4at.% and 8at.% Er:CaF2 samples with the value of 0.22 × 10−20 cm2 and 0.23 × 10−20 cm2, respectively. And the 4at.% and 8at.% Er:CaF2 samples also had the highest emission cross-section (σem) at 2727 nm with the value about 0.67 × 10−20 cm2. Lifetime of 4I13/2 decreased faster than that of 4I11/2 with the increase of erbium concentration. Under laser diode (LD) pumping, the continuous-wave (CW) laser operations around 2.79 μm were demonstrated in the 4at.%, 8at.% and 11at.% Er:CaF2 samples. And the 4at.% Er:CaF2 sample had the best laser performance with a maximum output power of 0.282 W and a slop efficiency of 13.9%.
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