[1] [1] H. A. Haus, K. Tamura, L. E. Nelson, and E. P. Ippen, IEEE J. Quantum Electron. 11, 591 (1995).

[2] [2] F. O. Ilday, J. R. Buckley, H. Lim, F. W. Wise, and W. G. Clark, Opt. Lett. 28, 1365 (2003).

[3] [3] A. Albert, V. Couderc, L. Lefort, and A. Barth el emy, IEEE Photon. Technol. Lett. 16, 416 (2004).

[4] [4] F. O. Ilday, J. R. Buckley, F. W. Wise, and W. G. Clark, Phys. Rev. Lett. 92, 213902 (2004).

[5] [5] J. R. Buckley, F. W. Wise, F. O. Ilday, and T. Sosnowski, Opt. Lett. 30, 1888 (2005).

[6] [6] A. Chong, J. Buckley, W. Renninger, and F. Wise, Opt. Express 14, 10095 (2006).

[7] [7] A. Chong, W. G. Renninger, and F. W. Wise, Opt. Lett. 32, 2408 (2007).

[8] [8] O. Prochnow, A. Ruehl, M. Schultz, D. Wandt, and D. Kracht, Opt. Express 15, 6889 (2007).

[9] [9] M. Schultz, H. Karow, O. Prochnow, D. Wandt, U. Morgner, and D. Kracht, Opt. Express 16, 19562 (2008).

[10] [10] K. Kieu and F. W. Wise, Opt. Express 16, 11453 (2008).

[11] [11] Q. Gu, J. Hou, X. Cheng, and X. Xu, Chinese J. Lasers (in Chinese) 35, 655 (2008).

[12] [12] F. Ren, W. Xiang, Y. Bai, N. Li, and X. Shi, Chinese J. Lasers (in Chinese) 36, 56 (2009).

[13] [13] D. Anderson, M. Desaix, M. Lisak, and M. L. Quiroga- Teixeiro, J. Opt. Soc. Am. B 9, 1358 (1992).

[14] [14] J. Buckley, A. Chong, S. Zhou, W. Renninger, and F. W. Wise, J. Opt. Soc. Am. B 24, 1803 (2007).

[15] [15] A. Chong, W. G. Renninger, and F. W. Wise, J. Opt. Soc. Am. B 25, 140 (2008).