Cittadino Giovanni, Damiano Eugenio, Di Lieto Alberto, Tonelli Mauro
Opt Express. 2020 May 11;28(10):14476-14489. doi: 10.1364/OE.390283.
In this work, we present the cooling efficiency of a LiYF (lithium yttrium fluoride,YLF) sample co-doped with 10at.% ytterbium (Yb) and 0.0040at.% thulium (Tm). For the first time at room temperature, the cooling efficiency of a sample overcomes the 4%-barrier, and it must be compared with the best values reported in literature, about 3%, obtained with a YLF:10at.%Yb sample. We also investigated the frequency behaviour of energy transfer mechanisms between Yb and Tm ions in order to have a better understanding of the contribution of phonons to the cooling cycle. These mechanisms can explain the cooling efficiency enhancement in the co-doped system.
在这项工作中，我们展示了共掺杂10原子%镱（Yb）和0.0040原子%铥（Tm）的LiYF（氟化锂钇，YLF）样品的冷却效率。在室温下，该样品的冷却效率首次突破了4%的障碍，并且必须与文献中报道的YLF:10原子%Yb样品所获得的约3%的最佳值进行比较。我们还研究了Yb和Tm离子之间能量转移机制的频率行为，以便更好地理解声子对冷却循环的贡献。这些机制可以解释共掺杂系统中冷却效率的提高。
