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用980 nm的近红外激光泵浦Bridgman方法生长的Tb~(3+)/Yb~(3+)共掺的α-NaYF_4单晶,研究了其上转换荧光以及荧光强度与泵浦功率的关系。结果表明:2个或者3个激发态的Yb~(3+)离子传递能量给1个Tb~(3+)离子并引发了双光子或三光子上转换。高效的三光子上转换的381、414、435和462 nm光和双光子上转换的481、541、587、651、659和668 nm光分别产生于Tb~(3+)离子的~5D_3→~7F_J(J=6,5,4,3)和~5D_4→~7F_J(J=6,5,4,3,2,1)辐射跃迁。现有实验下,当Tb~(3+)的掺杂量为0.52%(摩尔分数)时,Yb~(3+)的最佳掺杂量为7.98%,并可以进一步增加。以上结果表明了Tb~(3+)/Yb~(3+)共掺的α-NaYF_4单晶在上转换绿光固体激光材料方面的潜在应用。
The Tb ~ (3 +) / Yb ~ (3+) co-doped α-NaYF_4 single crystals grown by Bridgman method were pumped by 980 nm near-infrared laser and their up-conversion fluorescence and fluorescence intensity were compared with pump power . The results show that two or three excited Yb ~ (3+) ions transfer energy to one Tb ~ (3 +) ion and initiate two-photon or three-photon upconversion. The efficient three-photon upconversion of the 381,414,435 and 462 nm light and the two-photon up-conversion of 481,541,587,651,659 and 668 nm light were generated in the ~ 5D_3 → ~ 7F_J (J = 6,5,4,3) and ~ 5D_4 → ~ 7F_J (J = 6,5,4,3,2,1) radiation transitions. Under the existing experiments, the optimal doping amount of Yb ~ (3+) is 7.98% when the doping amount of Tb ~ (3+) is 0.52% (mole fraction), and can be further increased. The above results show the potential applications of Tb ~ (3 +) / Yb ~ (3+) co-doped α-NaYF_4 single crystal in the upconversion of green light solid laser materials.