1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
3. Northwest Institute of nuclear technology, Xi'an 710024, China