1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2. Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany
3. Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Shanxi 030006, China