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. LI Qiang, JIANG Meng-hua, SUN Zhe, ZHANG Xiang and LEI Hong, Journal of Optoelectronics·Laser 23, 429 (2012). (in Chinese)
3. Yanfei Lü, Jing Xia, Weibo Cheng, Jifeng Chen, Guobin Ning and Zuoliang Liang, Optics Letters 35, 3670 (2010).
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. Hsing-Chih Liang, Yi-Chun Lee, Jung-Chen Tung, Kuan-Wei Su, Kai-Feng Huang and Yung-Fu Chen, Optics Letters 37, 4609 (2012).