[1] [1] J. Pearce, Z. Jian, and D. M. Mittleman, Phil. Trans. R. Soc. Lond. A 362, 301 (2004).

[2] [2] J. Pearce and D. M. Mittleman, Opt. Lett. 26, 2002 (2001).

[3] [3] R. W. Mcgowan, G. Gallot, and D. Grischkowsky, Opt. Lett. 24, 1431 (1999).

[4] [4] E. Budiarto, N.-W. Pu, S. Jeong, and J. Bokor, Opt. Lett. 23, 213 (1998).

[5] [5] O. Mitrofanov, M. Lee, J. W. P. Hsu, L. N. Pfeiffer, K. W. West, J. D. Wynn, and J. F. Federici, Appl. Phys. Lett. 79, 907 (2001).

[6] [6] J. Bromage, S. Radic, G. P. Agrawal, C. R. Stroud, Jr., P. M. Fauchet, and R. Sobolewski, Opt. Lett. 22, 627 (1997).

[7] [7] M. T. Reiten, S. A. Harmon, and R. A. Cheville, J. Opt. Soc. Am. B 20, 2215 (2003).

[8] [8] J.-Z. Xu, L. Wang, and G.-Z. Yang, Chin. Phys. Lett. 17, 568 (2000).

[9] [9] W. Shi, J. Xu, and X. Zhang, Chin. Opt. Lett. 1, 308 (2003).

[10] [10] L. Lang, Q. Xing, S. Li, F. Mao, L. Chai, and Q. Wang, Chin. Opt. Lett. 2, 677 (2004).

[11] [11] Y. Jia, S. Chen, N. Li, M. Lu, D. Jiang, G. Wang, and J. Shen, Chinese J. Lasers (in Chinese) 34, 719 (2007).

[12] [12] B. Sun and J. Yao, Chinese J. Lasers (in Chinese) 33, 1349 (2006).

[13] [13] D. Qu, D. Grischkowsky, and W. Zhang, Opt. Lett. 29, 896 (2004).

[14] [14] A. K. Azad, J. M. Dai, and W. Zhang, Opt. Lett. 31, 634 (2006).

[15] [15] Z.-Y. Zhang, T. Ji, X.-H. Yu, T.-Q. Xiao, and H.-J. Xu, Chin. Phys. Lett. 23, 2239 (2006).