[1] [1] N. S. K. Kwong, K. Y. Lau, and N. Bar-Chaim, IEEE J. Quantum Electron. 25, 696 (1989).

[2] [2] B. D. Patterson, J. E. Epler, B. Graf, H. W. Lehmann, and H. C. Sigg, IEEE J. Quantum Electron. 30, 703 (1994).

[3] [3] J. H. Song, S. H. Cho, I. K. Han, Y. Hu, P. J. S. Heim, F. G. Johnson, D. R. Stone, and M. Dagenais, IEEE Photon. Technol. Lett. 12, 783 (2000).

[4] [4] S. Wang, H. Zhu, Z. Liu, R. Zhang, Y. Ding, L. Zhao, F. Zhou, J. Bian, L. Wang, and W. Wang, Chin. Opt. Lett. 2, 359 (2004).

[5] [5] O. Mikami, Y. Noguchi, K. Magari, and Y. Suzuki, IEEE Photon. Technol. Lett. 4, 703 (1992).

[6] [6] K. Magari, M. Okamoto, and Y. Noguchi, IEEE Photon. Technol. Lett. 3, 998 (1991).

[7] [7] M. Silver, A. F. Phillips, A. R. Adams, P. D. Greene, and A. J. Collar, IEEE J. Quantum Electron. 36, 118 (2000).

[8] [8] H. Ma, S. Chen, X. Yi, G. X. Zhu, and J. Jin, Opt. Quantum Electron. 36, 551 (2004).

[9] [9] J. M. Luttinger and W. Kohn, Phys. Rev. 97, 869 (1955).

[10] [10] A. Twardowski and C. Hermann, Phys. Rev. B 35, 8144 (1987).

[11] [11] D. Ahn and S.-L. Chuang, IEEE J. Quantum Electron. 26, 13 (1990).

[12] [12] G. A. Alphonse, Proc. SPIE 4648, 125 (2002).

[13] [13] A. T. Semenov, V. R. Shidlovski, M. E. Lipin, and V. E. Rafailov, Proc. SPIE 3860, 480 (1999).

[14] [14] V. Shidlovshi and J. Wei, Proc. SPIE 4648, 139 (2002).