[1] M. Yun, G. Li, and M. Wang, Chinese J. Lasers (in Chinese) 28, 821 (2001).

[2] Y. Xu, L. Song, and C. Zheng, J. Appl. Opt. (in Chinese) 26, (2) 57 (2005).

[3] C. Zheng, L. Song, R. Liang, and H. Zhu, J. Appl. Opt. (in Chinese) 24, (4) 40 (2003).

[4] Y. Liao, Polarization Optics (in Chinese) (Science Press, Beijing, 2003) p.216.

[5] W. Feng, L. Lin, L. Chen, H. Zhu, X. Li, and Z. Xu, Chin. Opt. Lett. 4, 705 (2006).

[6] J. Li, Handbook of Optics (in Chinese) (Shaanxi Science and Technique Press, Xi'an, 1986) pp.1304-1306.

[7] J. Schirmer and T. Schmidt-Kaler, Opt. Commun. 176, 313 (2000).

[8] T. Mu, G. Li, and L. Song, Chinese J. Lasers (in Chinese) 33, 949 (2006).

[9] L. Song, G. Li, Z. Dai, and G. Yu, Optoeletron. Laser (in Chinese) 8, 454 (1997).

[10] W. Wang, G. Li, F. Wu, L. Song, and D. Xue, Chinese J. Lasers (in Chinese) 30, 1221 (2003).

[11] Y. Sun, D. Wang, H. Zhang, Z. Zhang, and Y. Deng, Acta Opt. Sin. (in Chinese) 26, 685 (2006).