[1] [1] F. Sanchez and G. Stephan, Phys. Rev. E. 53, 2110 (1996).

[2] [2] D. Marcuse, IEEE J. Quant. Electron. 29, 2390 (1993).

[3] [3] S. D. Jackson, Electron. Lett. 38, 1640 (2002).

[4] [4] W. P. Risk, J. Opt. Soc. Am. B 5, 1412 (1988).

[5] [5] M. Salhi, A. Hideur, T. Chartier, M. Brunel, G. Martel, C. Ozkul, and F. Sanchez, Opt. Lett. 27, 1294 (2002).

[6] [6] Y. X. Fan, F. Y. Lu, S. L. Hu, K. C. Lu, H. J. Wang, X. Y. Dong, and G. Y. Zhang, IEEE Photon. Technol. Lett. 15, 652 (2003).

[7] [7] P. Glas, M. Naumann, A. Schirrmacher, L. Daweritz, and R. Hey, Opt. Commun. 161, 345 (1999).

[8] [8] W. H. Loh and J. P. de Sandro, Opt. Lett. 21, 1475 (1996).

[9] [9] L. G. Luo and P. L. Chu, Opt. Lett. 22, 1174 (1997).

[10] [10] Y. H. Tsang, T. A. King, D. K. Ko, and J. Lee, Opt. Commun. 259, 236 (2006).

[11] [11] W. Guan and J. R. Marciante, Opt. Lett. 34, 815 (2009).

[12] [12] M. Ding and P. K. Cheo, IEEE Photon. Technol. Lett. 9, 324 (1997).

[13] [13] A. V. Kir’yanov, N. N. Il’ichev, and Y. O. Barmenkov, Laser Phys. Lett. 1, 194 (2004).

[14] [14] R. G. Harrison, D. Yu, W. Lu, and P. M. Ripley, Phys. Nonlinear Phenom. 86, 182 (1995).