1. Department of Physics, Shanghai University, Shanghai 200444, P. R. China
2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P. R. China
3. Laboratory of Micro-Nano Optoelectronic Materials and Devices, Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
4. STU & SIOM Joint Laboratory for Superintense Lasers and the Applications, Shanghai 201210, P. R. China