[1] H. Haus, K. Tamura, L. Nelson, E. Ippen. IEEE J. Quantum Electron., 31, 591(1995).
[2] C. Zhang, L. Chai, Y. Song, M. Hu, C. Wang. Chin. Opt. Lett., 11, 051403(2013).
[3] F. Ilday, J. Buckley, W. Clark, F. Wise. Phys. Rev. Lett., 92, 213902(2004).
[4] B. Oktem, C. Ülgüdür, F. Ö. Ilday. Nat. Photonics, 4, 307(2010).
[5] A. Chong, W. H. Renninger, F. W. Wise. Opt. Lett., 32, 2408(2007).
[6] W. Tian, J. Zhu, Z. Wang, J. Wang, Z. Wei. Chin. Opt. Lett., 12, 031401(2014).
[8] L. Duan, X. Liu, D. Mao, L. Wang, G. Wang. Opt. Express, 20, 265(2012).
[9] X. Li, S. Zhang, H. Zhang, M. Han, F. Wen, Z. Yang. IEEE Photon. Tech. Lett., 26, 2082(2014).
[12] X. Liu. Phys. Rev. A, 81, 023811(2010).
[13] X. Liu. Phys. Rev. A, 82, 053808(2010).
[14] X. Wu, D. Tang, H. Zhang, L. Zhao. Opt. Express, 17, 5580(2009).
[16] X. Zhang, C. Gu, G. Chen, B. Sun, L. Xu, A. Wang, H. Ming. Opt. Lett., 37, 1334(2012).
[18] H. Q. Lin, C. Y. Guo, S. C. Ruan, J. H. Yang. Laser Phys. Lett., 11, 085102(2014).
[19] X. Liu, Y. Cui, D. Han, X. Yao, Z. Sun. Sci. Rep., 5, 9101(2015).
[20] X. Liu. Phys. Rev. A, 81, 053819(2010).
[21] D. Mao, X. Liu, H. Lu. Opt. Lett., 37, 2619(2012).
[22] L. Zhao, D. Tang, H. Zhang, X. Wu, N. Xiang. Opt. Express, 16, 9528(2008).
[23] G. Chen, C. Gu, L. Xu, H. Zheng, H. Ming. Chin. Opt. Lett., 9, 091405(2011).