[1] D. Dragoman and M. Dragoman, Progress in Quantum Electron. 28, 1 (2004).
[2] B. L. Yu, F. Q. Zeng, Q. R. Xing, and R. R. Alfamo, Appl. Phys. Lett. 82, 4633 (2003).
[3] D. Qu, D. Grischkowsky, and W. Zhang, Opt. Lett. 29, 896 (2004).
[4] Q. R. Xing, L. Y. Lang, F. L. Mao, Z. Wang, S. X. Li, L. Chai, and Q. Y. Wang, Chin. J. Lasers (in Chinese) 31, 640 (2004).
[5] L. Xu, X. C. Zhang, and D. H. Auston, Appl. Phys. Lett. 61, 1784 (1992).
[6] A. Rice, Y. Jin, X. F. Ma, and X. C. Zhang, Appl. Phys. Lett. 64, 1324 (1994).
[7] J.-P. Caumes, L. Videau, C. Rouyer, and E. Freysz, Phys. Rev. Lett. 89, 047401 (2002).
[8] R. A. Cheville and D. Grischkownsky, J. Opt. Soc. Am. B 16, 317 (1999).
[9] Q. R. Xing, W. L. Zhang, and K. M. Yoo, Opt. Commun. 119, 113 (1995).
[10] Q. R. Xing, F. L. Mao, L. Y. Lang, Z. Wang, K. Wang, S. X. Li, L. Chai, and Q. Y. Wang, Optics & Laser Technology (in press).