The National Natural Science Foundation of China(No.61205088);the National Natural Science Foundation of Chongqing City(No.2011BB2009);the Doctorial Start-up Fund of Southwest University(No.SWU110030);the Open Research Fund of State Key Laboratory of Transient Optics and Photonics,Chinese Academy of Sciences(No.201003);the Fundamental Research Funds for the Central Universities(No.XDJK2012B015,2014C015)