1. School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, P. R. China
2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an 710119, P. R. China
3. Department of Dermatology and Venerology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710061, P. R. China
4. Space Optical Technology Laboratory, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, P. R. China