1. State Key Laboratory of Precision Measuring Technology and Instruments
2. Tianjin University
3. CN-300072 Tianjin
4. China
5. Changchun Institute of Optics and Fine Mechanics and Physics
6. Chinese Academy of Science
7. CN-130033 Changchun
8. Institute of Experimental Physics
9. Johannes Kepler University Linz
10. A-4040 Linz
11. Austria