1. Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, P. R. China
2. Advanced Laser Technology Laboratory of Anhui Province, Hefei, 230037, P. R. China
3. Anhui Provincial Key Laboratory of Photonic Devices and Materials, Hefei, 230031, P. R. China
4. University of Science and Technology of China, Hefei, 230026, P. R. China