Benefit of Pr^3+ ions to the spectral properties of Pr^3+/Er^3+:CaGdAlO_4crystal for a 27 μm laser
2012; Optica Publishing Group; Volume: 37; Issue: 23 Linguagem: Inglês
10.1364/ol.37.004838
ISSN1539-4794
AutoresZhaojie Zhu, Jianfu Li, Zhenyu You, Yan Wang, Shaozhen Lv, En Ma, Jinlong Xu, Hongyan Wang, Chaoyang Tu,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoThe spectra of Er3+:CaGdAlO4 and Pr3+/Er3+:CaGdAlO4 crystals were measured under the same conditions. With the presence of Pr3+ ions, the intensities of the green, red upconversion and near-infrared emissions are dramatically reduced to 1/20, 1/150, and 1/8.5 of those for Er3+:CaGdAlO4. Furthermore, the lifetimes of I11/24 upper and I13/24 lower laser levels fall from 450 and 982 μs to 84.8 and 74.3 μs. It is obvious that the self-saturation for Er3+ 2.7 μm laser is effectively suppressed. The energy transfer efficiencies and coefficients of Er3+→Pr3+ are also calculated. These results indicate that Pr3+ codoping is beneficial in achieving 2.7 μm laser in Pr3+/Er3+:CaGdAlO4 crystal.
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