[1] B. Chen, L. Yan, X. Yao, T. Yang, D. Li, W. Dong, C. Li, and W. Tang, Opt. Express 18, 3000 (2010).
[2] Z. Zhao, S. Zhang, P. Zhang, Z. Zeng, Y. Tan, and Y. Li, Chin. Opt. Lett. 10, 032801 (2012).
[3] M. Kim and S. Kim, Appl. Opt. 41, 5938 (2002).
[4] F. Xie, M. Li, D. Song, J. Sun, and T. Zhang, Opt. Express 18, 24961 (2010).
[5] K. Joo, J. D. Ellis, E. S. Buice, J. W. Spronck, and R. H. M. Schmidt, Opt. Express 18, 1159 (2010).
[6] C. Wu, and R. D. Deslattes, Appl. Opt. 37, 6696 (1998).
[7] Y. Guo, Y. Wu, and Y. Wang, Chin. Opt. Lett. 10, 061901 (2012).
[8] P. Gregorcic, T. Pozar, and J. Mozina, Opt. Express 17, 16322 (2009).
[9] Z. Zhang, Z. Cheng, Z. Qin, and J. Zhu, Optik 1119, 772 (2008)
[10] M. Zhao, X. Qu, and B. Lu, Chinese J. Lasers (in Chinese) 27, 431 (2000).
[11] Y. Tan, S. Zhang, W. Liu, and W. Mao, Chin. Phys. 16, 1020 (2007).
[12] W. Mao, S. Zhang, and L. Fei, Appl. Opt. 45, 8500 (2006).
[13] W. Chen, S. Zhang, and X. Long, Chin. Opt. Lett. 10, 052601 (2012).
[14] Z. Cheng, H. Gao, Z. Zhang, H. Huang, and J. Zhu, Appl. Opt. 45, 2246 (2006).