[1] [1] Q. Wu and X. C. Zhang, Appl. Phys. Lett. 68, 1604 (1996).

[2] [2] A. Nahata, D. H. Auston, T. F. Heinz, and C. Wu, Appl. Phys. Lett. 68, 150 (1996).

[3] [3] A. Nahata, D. H. Auston, C. Wu, and J. T. Yardley, Appl. Phys. Lett. 67, 1358 (1995).

[4] [4] Y. Enami, C. T. Derose, D. Mathine, C. Loychik, C. Greenlee, R. A. Norwood, T. D. Kim, J. Luo, Y. Tian, A. K.-Y. Jen, and N. Peyghambarian, Nat. Photonics 1, 180 (2007).

[5] [5] X. Piao, X. Zhang, Y. Mori, M. Koishi, A. Nakaya, S. Inoue, I. Aoki, A. Otomo, and S. Yokoyama, J. Poly. Sci. A: Poly. Chem. 49, 47 (2011).

[6] [6] X. S .Cheng, W. W. Qiu, W. X. Wu, Y. H. Luo, X. J. Tian, Q. J. Zhang, and B. Zhu, Chin. Opt. Lett. 9, 020602 (2011).

[7] [7] L. Wang, J. Liu, S. Bo, Z. Zhen, and X. Liu, Mater. Lett. 80, 84(2012).

[8] [8] X. Zheng, A. Sinyukov, and L. M. Hayden, Appl. Phys. Lett. 87, 081115 (2005).

[9] [9] Y. B. Jeon, R. Sood, J. Jeong, and S. G. Kim, Sens. Act. A: phys. 122, 16(2005).

[10] [10] C. W. Christenson, C. Greenlee, B. Lynn, J. Thomas, P. A. Blanche, and N. Peyghambarian, Opt. Lett. 36, 3377 (2011).

[11] [11] L. M. Hayden, A. M. Sinyukov, MR. Laehy, J. Fench, P. Gunter, W. N. Herman, R. J. Twieg, and H. Meng, J. Poly. Sci. B. 41, 2492 (2003).

[12] [12] M. C. Gower, Opt. Express. 7, 56 (2000).

[13] [13] A. Sandalphon, B. Kippelen, K. Meerholz, and N. Peyghambarian, Appl. Opt. 35, 2346 (1996).

[14] [14] J. A. Valdmanis, G. Mourou, and C. W. Gabel, Appl. Phys. Lett. 41, 211 (1982).

[15] [15] N. C. J. van der Valk, T. Wenckebach, and P. C. M. Planken, J. Opt. Soc. Am. B 21, 622 (2004).

[16] [16] C. V. McLaughlin, X. Zheng, and L. M. Hayden, Appl. Opt. 25, 6283 (2007).