[1] Y. Hirano, in Proceedings of CLEO 2004 CMDD4 (2004).
[2] P. J. Rodrigo and C. Pedersen, Opt. Lett. 37, 2277 (2012).
[3] X. Zhu, J. Liu, D. Bi, J. Zhou, W. Diao, and W. Chen, Chin. Opt. Lett. 10, 012801 (2012).
[4] M. C. Heintze, N. W. H. Chang, F. Jeanneret, J. Munch, D. J. Ottaway, and P. J. Veitch, Appl. Opt. 50, 4017 (2011).
[5] C. J. Karlsson, F. °A. A. Olsson, D. Letalick, and M. Harris, Appl. Opt. 39, 3716 (2000).
[6] R. M. Huffaker, A. V. Jelalian, and J. A. L. Thomson, Proc. IEEE 58, 322 (1970).
[7] M. Harris, G. N. Pearson, K. D. Ridley, C. J. Karlsson, F. °A. A. Olsson, and D. Letalick, Appl. Opt. 40, 969 (2001).
[8] M. Harris, G. Constant, and C. Ward, Appl. Opt. 40, 1501 (2001).
[9] C. Zhou, Y. Liu, R. Zhu, S. Du, X. Hou, W. Chen, Chin. Opt. Lett. 11, 081403 (2013).
[10] R. Zhu, J. Wang, J. Zhou, J. Liu, W. Chen, Chin. Opt. Lett. 10, 091402 (2012).
[11] M. Akbulut, J. Hwang, F. Kimpel, S. Gupta, and H. Verdun, Proc. SPIE 8037, 80370R (2011).
[12] S. Kameyama, T. Ando, K. Asaka, Y. Hirano, and S. Wadaka, Appl. Opt. 46, 1953 (2007).
[13] J. P. Cariou, B. Augere, and M. Valla, C. R. Physique 7, 213 (2006).
[14] J. P. Cariou, M. Boquet, S. Lolli, R. Parmentier, and L. Sauvage, Proc. SPIE 7479, 74790O (2009).
[15] V. M. Gordienko, A. V. Koryabin, N. V. Kravtsov, and V. V. Firsov. Laser Phys. Lett. 5, 390 (2008).
[16] G. Canata, L. Lombarda, A. Dolfia, M. Vallaa, C. Planchata, B. Aug`erea, P. Bourdona, V. Joliveta, C. Bessona, Y. Jaouenb, S. Jetschkec, So. Ungerc, J. Kirchhofc, E. Gueorguievd, and C. Vitred. Fiber Integ. Opt. 27, 422 (2008).
[17] J. Liu, W. Chen, and X. Zhu, in Proceedings of Optical Instrumentation for Energy and Environmental Applications ET4D ET4D.1 (2012).
[18] Z. Pan, H. Cai, L. Meng, J. Geng, Q. Ye, Z. Fang, and R. Qu, Chin. Opt. Lett. 8, 52 (2010).
[19] Y. Liu, J. Liu, and W. Chen, Chin. Opt. Lett. 9, 090604 (2011).