[1] [1] YAO Jian-quan, ZHANG Zhuo, XU De-gang, ZHANG Hao, LI Jia-qi, WANG Yu-ye and ZHONG Kai, Journal of Optoelectronics·Laser 24, 629 (2013). (in Chinese)

[2] [2] LI Qiang, JIANG Meng-hua, SUN Zhe, ZHANG Xiang and LEI Hong, Journal of Optoelectronics·Laser 23, 429 (2012). (in Chinese)

[3] [3] Yanfei Lü, Jing Xia, Weibo Cheng, Jifeng Chen, Guobin Ning and Zuoliang Liang, Optics Letters 35, 3670 (2010).

[4] [4] SHI Jing-jing, TIAN Zhen-hua, QIN Li, ZHANG Yan, WANG Zhen-fu, LIANG Xue-mei, YANG Ye, NING Yong-qiang, LIU Yun and WANG Li-jun, Journal of Optoeletronics·Laser 21, 1445 (2010). (in Chinese)

[5] [5] Hsing-Chih Liang, Yi-Chun Lee, Jung-Chen Tung, Kuan-Wei Su, Kai-Feng Huang and Yung-Fu Chen, Optics Letters 37, 4609 (2012).

[6] [6] G. K. Samanta and M. Ebrahim-Zadeh, Optics Letters 35, 1986 (2010).

[7] [7] Y. L. Li, Laser Physics 21,1855 (2011).

[8] [8] Y. L. Li, H. L. Jiang, T. Y. Ni, T. Y. Zhang, Z. H. Tao and Y. H. Zeng, Laser Physics 21, 670 (2011).

[9] [9] YAO Jian-quan, ZHANG Zhuo, XU De-gang, ZHANG Hao, LI Jia-qi, WANG Yu-ye and ZHONG Kai, Journal of Optoeletronics·Laser 24, 629 (2013). (in Chinese)

[10] [10] Y. F. Lü, J. Xia, X. D. Yin, D. Wang and X. H. Zhang, Laser Physics Letters 7, 11 (2010).

[11] [11] G. Q. Xie, L. J. Qian, X. D. Xu, Y. Cheng, Z. W. Zhao, D. Y. Tang, J. Zhang, W. D. Tan and J. Xu, Laser Physics 20, 1331 (2010) .

[12] [12] D. Z. Li, X. D. Xu, C. W. Xu, J. Zhang, D. Y. Tang, Y. Cheng and J. Xu, Optics Letters 36, 3888 (2011).