[1] D. Tang, J. Zhang, Y. Liu, and W. Zhao, Chin. Opt. Lett. 8, 630 (2010).

[2] J. Peng, and R. Shu, Opt. Express. 15, 4485 (2007).

[3] T. Wilke, C. Lovis, A. Manescau, T. Steinmetz, L. Pasquini, G. Lo Curto, T. W. H¨ansch, R. Holzwarth, and Th. Udem, Mon. Not. R. Astron. Soc. 405, L16 (2010).

[4] T. Hochrein, R. Wilk, M. Mei, R. Holzwarth, N. Krumbholz, and M. Koch, Opt. Express 18, 1613 (2010).

[5] T. R. Schibli, I. Hartl, D. C. Yost, M. J. Martin, A. Marcinkevicius, M. E. Fermann, and J. Ye, Nat. Photon. 2, 355 (2008).

[6] L. Nugent-Glandorf, T. A. Johnson, Y. Kobayashi, and S. A. Diddams, Opt. Lett. 36, 1578 (2011).

[7] S. T. Cundiff, J. Phys. D 35, 43 (2002).

[8] I. Hartl, A. Romann, and M. E. Fermann, in Proceedings of Laser and Electro-optics (CLEO) CMD3 (2011).

[9] S. Yamashita, T. Yoshida, S. Y. Set, P. Polynkin, and N. Peyghambarian, Proc. SPIE 6453, 64531Y (2007).

[10] K. Tamura, E. P. Ippen, H. A. Haus, and L. E. Nelson, Opt. Lett. 18, 1080 (1993).

[11] P. Zhang, Y. Jiang, W. Wang, and X. Li, Chin. Opt. Lett. 10, 061402 (2012).

[12] J. L. Morse, J. W. Sickler, J. Chen, F. X. K¨artner, and E. P. Ippen, in Proceedings of Laser and Electro-optics (CLEO) CML1 (2009).

[13] J. Peng, T. Liu, and R. Shu, in Proceedings of Laser and Electro-optics/International Quantum Electronics Conference CTuK3 (2009).

[14] X. Wei, S. Xu, H. Huang, M. Peng, and Z. Yang, Opt. Express 20, 24607 (2012).

[15] A. Wang, H. Yang, and Z. Zhang, Opt. Express 19, 25412 (2011).

[16] H. Yang, A. Wang, and Z. Zhang, Opt. Lett. 37, 954 (2012).

[17] C. Li, G. Wang, T. Jiang, A. Wang, and Z. Zhang, Opt. Lett. 38, 314 (2013).

[18] H. Yang, A. Wang, Y. Ma, Z. Fan, G. Niu, J. Yu, Y. Liu, X. Zhang, and Z. Zhang, Chin. Opt. Lett. 10, 033201 (2012).

[19] F. O. Ilday, "Theory and practice of high-energy femtosecond fiber lasers", PhD. Thesis (Cornell University, 2004).