[1] [1] B. E. A. Saleh and M. C. Teich, Fundamentals of Photonics (John Wiley and Sons, New York, 1991).

[2] [2] J. Fu, X. Yin, N. Li, and L. Tong, Chin. Opt. Lett. 6, 112 (2008).

[3] [3] Z. Zhang, M. Qiu, U. Andersson, and L. Tong, Chin. Opt. Lett. 5, 577 (2007).

[4] [4] L. M. Tong, R. R. Gattass, J. B. Ashcom, S. L. He, J. Y. Lou, M. Y. Shen, I. Maxwell, and E. Mazur, Nature 426, 816 (2003).

[5] [5] G. Brambilla, V. Finazzi, and D. J. Richardson, Opt. Express 12, 2258 (2004).

[6] [6] S. Leon-Saval, T. A. Birks, W. J. Wadsworth, P. St. J. Russell, and M. Mason, Opt. Express 12, 2864 (2004).

[7] [7] M. Sumetsky, Y. Dulashko, and A. Hale, Opt. Express 12, 3521 (2004).

[8] [8] M. Sumetsky, Y. Dulashko, J. M. Fini, and A. Hale, Appl. Phys. Lett. 86, 161108 (2005).

[9] [9] L. M. Huang, H. T. Wang, C. Y. Hayashi, B. Z. Tian, D. Y. Zhao, and Y. S. Yan, J. Mater. Chem. 13, 666 (2003).

[10] [10] C. Zhao, Z. Tang, Y. Ye, D. Fan, L. Qian, S. Wen, and G. Chen, Opt. Express 15, 6629 (2007).

[11] [11] E. Karadeniz and P. Kornreich, Opt. Eng. 45, 085001 (2006).

[12] [12] J. Y. Lou, L. M. Tong, and Z. Z. Ye, Opt. Express 14, 6993 (2006).

[13] [13] G. Agrawal, Nonlinear Fibre Optics 2nd edn. (Academic, New York, 1994).

[14] [14] L. M. Tong, J. Y. Lou, and E. Mazur, Opt. Express 12, 1025 (2004).

[15] [15] V. R. Almeida, Q. Xu, C. A. Barrios, and M. Lipson, Opt. Lett. 29, 1209 (2004).

[16] [16] G. S. Wiederhecker, C. M. B. Cordeiro, F. Couny, F. Benabid, S. A. Maier, J. C. Knight, C. H. B. Cruz, and H. L. Fragnito, Nature Photon. 1, 115 (2007).