[1] [1] Y. C. Chen, S. Li, K. K. Lee, and S. Zhou, Opt. Lett. 18, 1418 (1993).

[2] [2] S. Li, S. Zhou, P. Wang, Y. C. Chen, and K. K. Lee, Opt. Lett. 18, 203 (1993).

[3] [3] G. Yao, S.-H. Zhou, P. Wang, K. K. Lee, and Y. C. Chen, Opt. Commun. 114, 101 (1995).

[4] [4] P. Wang, S.-H. Zhou, K. K. Lee, and Y. C. Chen, Opt. Commun. 114, 439 (1995).

[5] [5] S.-M. Wang, B.-H. Feng, Q.-L. Zhang, L. Zhang, D.-X. Zhang, Z.-G. Zhang, and S.-W. Zhang, Chin. Phys. Lett. 22, 877 (2005).

[6] [6] J. Dong, J. R. Lu, and K. Ueda, J. Opt. Soc. Am. B 21, 2130 (2004).

[7] [7] J. Dong, P. Deng, and M. Bass, Opt. Laser Technol. 34, 589 (2002).

[8] [8] S. Zhou, K. K. Lee, Y. C. Chen, and S. Li, Opt. Lett. 18, 511 (1993).

[9] [9] C.-Y. Li, P.-X. Li, D.-H. Li, B.-H. Feng, P.-M. Fu, Z.-G. Zhang, and S.-W. Zhang, Chin. Phys. Lett. 21, 313(2004).

[10] [10] J. Dong, P. Deng, Y. Zhang, Y. Liu, J. Xu, W. Chen, and Y. Lu, Chinese J. Lasers (in Chinese) 28, 484 (2001).

[11] [11] T. Zhou and J. Chen, Acta Opt. Sin. (in Chinese) 23, 455 (2003).

[12] [12] Q. Li, B. Feng, D. Zhang, S. Du, Y. Shi, Z. Zhang, and S. Zhang, Appl. Phys. B 93, 421 (2008).

[13] [13] Y. Kalisky, L. Kravchik, and M. Kokta, Opt. Mater. 24, 607 (2004).

[14] [14] J. Dong, P. Deng, Y. Lu, Y. Zhang, Y. Liu, J. Xu, and W. Chen, Opt. Lett. 25, 1101 (2000).

[15] [15] Y.-X. Shi, Q.-N. Li, S.-F. Du, D.-X. Zhang, Z.-G. Zhang, B.-H. Feng, and S.-W. Zhang, Chin. Phys. Lett. 26, 14212 (2009).