1National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base), Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710069, China
2Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Xi’an 710069, China
3Provincial Key Laboratory of Photo-electronic Technology, Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710069, China