图20. (a)在1.5 K下，YAG:Ce,Yb陶瓷的94 GHz连续波EPR谱，虚线为粉末材料中Yb³⁺和Ce³⁺的EPR模拟谱，插图为不同方向的YAG:Ce,Gd单晶中Gd³⁺的EPR谱；(b)在1.5 K和5 K下，YAG:Ce,Cr陶瓷中的94GHz连续波EPR谱，虚线为粉末材料中Ce³⁺、Cr³⁺和Gd³⁺的EPR模拟谱^[50]

Fig. 20. (a) 94 GHz continuous wave EPR spectra in YAG:Ce,Yb ceramics at 1.5 K. The dashed lines are the EPR simulation spectra of Yb³⁺ and Ce³⁺ in powder materials. The illustrations are the EPR spectra of Gd³⁺ in YAG:Ce,Gd single crystals in different directions; (b) 94 GHz continuous wave EPR spectra in YAG:Ce,Cr ceramics at 1.5 K and 5 K, and dashed lines are EPR simulation spectra of Ce³⁺, Cr³⁺ and Gd³⁺ in powder materials^[50]