[1] [1] M. L. Wang, Q. Liu and Y. Li, Optoelectronics Letters 6, 310 (2010).

[2] [2] D. Gregory, W. Van and R. Rajarshi, Science 279, 1198 (2011).

[3] [3] H. Arellnano-Sotelo, A. V. Kiryanov, Y. O. Barmenkov and V. Aboites, Opt. Laser Technol. 43, 132 (2011).

[4] [4] L. Z. Yang, L. Zhang, R. Yang, L.Yang, B. H. Yue and P. Yang, Opt. Commun. 285, 143 (2012).

[5] [5] P. P. Yupapin, Optik 119, 492 (2008).

[6] [6] S. Mitatha, K. Dejhan, P. P. Yupapin and N. Pornsuwancharoen, Optik 121, 120 (2010).

[7] [7] P. P. Yupapin, W. Suwanchareon and S. Suchat, Optik 120, 216(2009).

[8] [8] S. G. Deng, Y. S. Jiang, Z. D. Li and F. Sang, Optoelectronics Letters 6, 380 (2010).

[9] [9] Y. Q. Wu, Z. D. Qiao, M. J. Zhang, Z. Q. Jin and L. Z. Yang, Chin. Opt. Lett. 8, 1139 (2010).

[10] [10] J. E. Heebner and R. W. Boyd, Opt. Lett. 24, 847 (1999).

[11] [11] E. Genin, L. Larger, J. P. Goedgebuer, M. W. Lee, R. Ferriere and X. Bavard, IEEE J. Quantum Electron. 40, 294 (2004).

[12] [12] C. Jauregui, J. M. Lopez-Higuera, A. Cobo, O. M. Conde and J.Zubia, J. Opt. Soc. Am. B 23, 2024 (2006).

[13] [13] F. E. Seraji and F. Asghari, Opt. Laser Technol. 42, 115 (2010).

[14] [14] Y. Zhao, S. Min, H. Wang and S. Fleming, Opt. Express 14,10475 (2006).

[15] [15] O. Kazuhiko, IEEE J. Quantum Electron. 32, 1537 (1996).

[16] [16] O. Kazuhiko, L. S. Alan, E. H. John and L. Stephen, IEEE J. Quantum Electron. 33, 2128 (1997).