1. Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
2. St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
3. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics, Shanxi University, Taiyuan 030006, China
4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People’s Republic of China