[1] H. Wu, L. Wang, F. Liu, H. Peng, J. Zhang, C. Tong, Y. Ning, and L. Wang, Chin. Opt. Lett. 11, 091401 (2013).

[2] E. Kasper, M. Kittler, M. Oehme, and T. Arguirov, Photon. Res. 1, 69 (2013).

[3] A. Joullie and P. Christol, Comptes Rendus Physique 4, 621 (2003).

[4] X. Shu, T. Liu, G. Zhang, X. Chen, J. Qin, and C. Chen, Chin. J. Inorg. Chem. 22, 1163 (2006).

[5] B. Yao, Y. Wang, and Q. Wang, Laser Technol. (in Chinese) 26, 217 (2002).

[6] F. Charpentier, F. Starecki, J. L. Doualan, P. Jovari, P. Camy, J. Troles, S. Belin, B. Bureau, and V. Nazabal, Mater. Lett. 101, 21 (2013).

[7] E. Virey, M. Couchaud, C. Faure, B. Ferrand, C. Wyon, and C. Borel, J. Alloys and Compd. 275, 311 (1998).

[8] H. Chen, S. Fan, H. Xia, and J. Xu, Mater. Sci. Lett. 21, 457 (2002).

[9] J. Hu, H. Xia, H. Hu, Y. Zhang, and H. Jiang, J. Appl. Phys. 112, 073518 (2012).

[10] L. Tang, H. Xia, P. Wang, J. Peng, Y. Zhang, H. Jiang, and H. Chen, Mater. Lett. 104, 37 (2013).

[11] L. Tang, H. Xia, P. Wang, J. Peng, and H. Jiang, Chin. Opt. Lett. 11, 061603 (2013).

[12] I. Sokolska, E. Heumann, S. Kuch, and T. Lukasiewicz, Appl. Phys. B 71, 893 (2000).

[13] X. Yu, H. Chen, S. Wang, Y. Zhou, A. Wu, and S. Dai, J Inorg. Mater. 26, 923 (2011).

[14] S. Dai, B. Peng, P. Zhang, T. Xu, X. Wang, Q. Nie, and X. Zhang, J. Non-Cryst. Solids. 356, 2424 (2010).

[15] M. Ichikawa, Y. Ishikawa, T. Wakasugi, and K. Kadono, Opt. Mater. 35, 1941 (2013).