[1] L. Li, Y. Tang, J. Yang, M. Wang, and X. Jiang, Chin. Opt. Lett. 4, 93 (2006).
[2] J. Wu, B. Shi, and M. Kong, Chin. Opt. Lett. 4, 167 (2006).
[3] C. Wachter, Th. Hennig, Th. Bauer, A. Brauer, and W. Karthe, Proc. SPIE 3278, 102 (1998).
[4] S. M. Garner, S.-S. Lee, V. Chuyanov, A. Chen, A. Yacoubian, W. H. Steier, and L.R. Dalton, IEEE J. Quantum Electron. 35, 1146 (1999).
[5] C. Wachter, Th. Bauer, M. Cumme, P. Dannberg, W. Elflein, Th. Henning, U. Streppel, and W. Karthe, Proc. SPIE 3936, 130 (2000).
[6] M. Hikita, Y. Shuto, M. Amano, R. Yoshimura, S. Tomaru, and H. Kozawaguchi, Appl. Phys. Lett. 63, 1161 (1993).
[7] H.-F. Zhou, J.-Y. Yang, M.-H. Wang, and X.-Q. Jiang, Chin. Phys. 16, 740 (2007).
[8] W.-P. Huang, J. Opt. Soc. Am. A 11, 963 (1994).
[9] C.-M. Kim and Y.-J. Im, IEEE J. Sel. Top. Quantum Electron. 6, 170 (2000).
[10] S. Srivastava and E. K. Sharma, J. Opt. Soc. Am. A 13, 1683 (1996).
