[1] [1] Y.-J. Yang, F.-S. Chen, and B. Sun, Chin. Phys. Lett. 24, 965 (2007).

[2] [2] Y.-J. Yang, F.-S. Chen, and B. Sun, J. Optoeletron. Laser (in Chinese) 18, 949 (2007).

[3] [3] B. Sun, F.-S. Chen, and Y.-J. Yang, J. Univ. Electron. Sci. Technol. China (in Chinese) 34, 898 (2005).

[4] [4] V. M. N. Passaro, F. Dell’Olio, and F. De Leonardis, Progr. Quant. Electron. 30, 45 (2006).

[5] [5] Y. Yang, F. Chen, and B. Sun, Chin. Opt. Lett. 4, 643 (2006).

[6] [6] K. Tajima, R. Kobayashi, N. Kuwabara, and M. Tokuda, IEICE Transaction. Electron. E83-C, 347 (2000).

[7] [7] S. S. Sriram and S. A. Kingsley, Proc. SPIE 5435, 143 (2004).

[8] [8] Q. Zhang, D. Huang, X. Zhang, and T. Jiang, Acta Opt. Sin. (in Chinese) 27, 2194 (2007).

[9] [9] W. Chen, J. Wu, J. Tan, Q. Hu, Y. Zhu, and P. Zhang, Acta Opt. Sin. (in Chinese) 27, 2128 (2007).

[10] [10] K. Tajima, R. Kobayashi, N. Kuwabara, and M. Tokuda, Electr. Eng. Jpn. 123, 25 (1998).

[11] [11] P. Basseras, R. J. D. Miller, and S. M. Gracewski, J. Appl. Phys. 69, 7774 (1991).