1. School of Physics and Technology
2. University of Jinan
3. Jinan
4. People's Republic of China
5. Laboratory of Excited State Processes
6. Changchun Institute of Optics
7. Fine Mechanics and Physics
8. Chinese Academy of Sciences
9. Changchun 130021
10. Department of Physics
11. Jilin University
12. Changchun 130023
13. Materials Characterization Group
14. Western Digital Company
15. USA