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Effect of erbium concentration on spectroscopic properties and 279 μm laser performance of Er:CaF_2 crystals

2016; Optica Publishing Group; Volume: 6; Issue: 2 Linguagem: Inglês

10.1364/ome.6.000409

2159-3930

Weiwei Ma, Liangbi Su, Xiaodong Xu, Jingya Wang, Dapeng Jiang, Lihe Zheng, Xiuwei Fan, Chun Li, Jie Liu, Jun Xu,

Photorefractive and Nonlinear Optics

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%.