[1] [1] F. G. Wienhold, H. Fischer, P. Hoor, V. Vagner, R. Konigstedt, G. W. Harris, J. Anders, R. Grisar, M. Knothe, W. J. Riedel, F.-J. Liibken, and T. Schilling, Appl. Phys. B 67, 411 (1998).

[2] [2] J. A. Silver, Appl. Opt. 31, 707 (1992).

[3] [3] K. Duffin, A. J. McGettrick, W. Johnstone, G. Stewart, and D. G. Moodie, J. Lightwave Technol. 25, 3114 (2007).

[4] [4] S. Zhang, W. Liu, Y. Zhang, X. Shu, D. Yu, R. Kan, J. Dong, H. Geng, and J. Liu, Chin. Opt. Lett. 8, 443 (2010).

[5] [5] B. Tao, X. Ye, Z. Hu, R. Zhang, and J. Liu, Chin. Opt. Lett. 8, 1098 (2010).

[6] [6] J. Reid and D. Labrie, Appl. Phys. B 26, 203 (1981).

[7] [7] P. Kluczynski, J. Gustafsson, A. M. Lindberg, and O. Axner, Spectrochim. Acta Part B 56, 1277 (2001).

[8] [8] P. Werle, Spectrochim. Acta Part A 54, 197 (1998).

[9] [9] P. Werle, Appl. Phys. B 60, 499 (1995).

[10] [10] D. S. Bomse, A. C. Stanton, and J. A. Silver, Appl. Opt. 31, 718 (1992).

[11] [11] G. B. Rieker, J. B. Jeffries, and R. K. Hanson, Appl. Opt. 48, 5546 (2009).

[12] [12] T. Fernholz, H. Teichert, and V. Ebert, Appl. Phys. B 75, 229 (2002).