[1] E. V. Raevsky, V. L. Pavlovitch, and V. A Konovalov, Proc. SPIE, 4630, 75 (2002).

[2] B. Pei, Z. Bao, Y. Zhou, S. Zhou, and K. Shen, Chin. J. Lasers (in Chinese) 29, 395 (2002).

[3] R. Dabu, C. Fenic, and A. Stratan, Appl. Opt. 40, 4334 (2001).

[4] Y. Yashkir, D. Van, and M. Henry, Appl. Opt. 38, 2554 (1999).

[5] Z. Bao, S. Zhou, and H. Zhao, Chin. J. Lasers (in Chinese) 30, 395 (2003).

[6] Y. Wang, X. Yu, B. Yao, W. He, Y. Ju, Q. Liu, and Q. Wang, Chin. J. Lasers (in Chinese) 28, 689 (2001).

[7] Y. Wang, Q. Liu, B. Yao, Y. Ju, and Q. Wang, Acta Opt. Sin. (in Chinese) 18, 1176 (1998).

[8] W. Zendzian, J. K. Jabczynski, P. Wachulak, and J. Kwiatkowski, Appl. Phys. B 78, 12 (2004).

[9] Y. F. Chen, S. W. Chen, S. W. Tsai, and Y. P. Lan, Appl. Phys. B 77, 505 (2003).

[10] M. Oka, H. Masuda, Y. Kaneda, and S. Kubota, IEEE J. Quantum Electron. 28, 1142 (1992).

[11] T. Y. Fan and J. Ochoa, IEEE Photon. Technol. Lett. 7, 1137 (1995).