1. The Beijing Municipal Key Laboratory of New Energy Materials and TechnologiesSchool of Materials Sciences and EngineeringUniversity of Science and Technology Beijing Beijing 100083 P. R. China
2. Laboratory of Crystal PhysicsKirensky Institute of PhysicsFederal Research Center KSC SB RAS Krasnoyarsk 660036 Russia
3. Department of Engineering Physics and RadioelectronicsSiberian Federal University Krasnoyarsk 660041 Russia
4. Department of PhysicsFar Eastern State Transport University Khabarovsk 680021 Russia
5. State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of Technology Guangzhou 510641 P. R. China