1. Institute for Laser Science; University of Electro-Communications 182-8585 Tokyo Japan
2. State Key Laboratory of Crystal Materials and Institute of Crystal Materials; Shandong University 250100 Jian P.R. China
3. Laboratory of Advanced Laser Materials and Devices; Jiangsu Normal University 221116 Xuzhou P.R. China
4. Institute of Crystallography; Russian Academy of Sciences 119333 Moscow Russia