[1] Werle P. Spectrochim. Acta Part A, 1998, 54: 197.
[2] Silver J A, Bomse D S. U. S. Patent, 6356350B1, 2002.
[3] Dharamsi A N. J. Phys. D: Appl. Phys., 1996, 29: 540.
[4] Kluczynski P, Gustafsson J, Lindberg M, et al. Spectrochim. Acta Part B, 2001, 56: 1277.
[5] Cui H X, Du Z H, Chen W L, et al. Lasers in Eng., 2008, 18: 263.
[6] Tittel F K, Bakhirkin Y, Kosterev A A, et al. Rev. Lasers Eng., 2006, 34: 275.
[8] Kosterev A A, Tittel F K, Gmachl C, et al. Appl. Opt., 2000, 39: 6866.
[9] Normand E, McCulloch M, Duxbury G, et al. Opt. Lett., 2003, 28: 16.
[10] Namjou K, Cai S, Whittaker E A, et al. Opt. Lett., 1998, 23: 219.
[11] Weidmann D, Tittel F K, Aellen T, et al. Appl. Phys. B, 2004, 79: 907.