1. Statel Key Laboratory of Energy Photon-Technology in Western China, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi’an 710127, China
2. Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Shaanxi Provincial Key Laboratory of Photo-Electronic Technology, Northwest University, Xi’an 710127, China