liquid nitrogen cooled detector

A series of Er 3+ /Yb 3+ co-doped BaF_2 powders with the same compositions were prepared at different sintering temperatures, and the samples were cooled by liquid-nitrogen refrigerating and air-cooling, respectively.

采用液氮制冷和空冷两种冷却方式制备了不同烧结温度的系列相同配方Er3+/Yb3+共掺杂BaF2粉末。