[1]
Rare Earth Doped Fibre Lasers and Amplifiers, edt. by M. J. F. Digonet (Marcel Dekker, New York, 1993).
Google Scholar
[2]
H. K¨uhne, G. Weiser, E. I. Terukov, A. N. Kusnetsov, V. Kh. Kudoyarova, J. Appl. Phys. 86, 896 (1999).
Google Scholar
[3]
Y. Shishkin, W. J. Choyke, R. P. Devaty, N. Achtziger, Th. Opfermann, W. Witthuhn, Mater. Sci. Forum 338-342, 639 (2000).
DOI: 10.4028/www.scientific.net/msf.338-342.639
Google Scholar
[4]
G. Pasold, F. Albrecht, J. Grillenberger, U. Grossner, C. H¨ulsen, R. Sielemann and W. Witthuhn, Mater. Sci. Forum 433-436, 487 (2003).
DOI: 10.4028/www.scientific.net/msf.433-436.487
Google Scholar
[5]
G. Pasold, F. Albrecht, J. Grillenberger, U. Grossner, C. H¨ulsen, W. Witthuhn, and R. Sielemann, J. Appl. Phys. 93, 2289 (2003).
DOI: 10.1063/1.1539539
Google Scholar
[6]
D.V. Lang, J. Appl. Phys. 45(7), 3023 (1974).
Google Scholar
[7]
J. Grillenberger, N. Achtziger, R. Sielemann, W. Witthuhn, J. Appl. Phys. 88, 3260 (2000).
Google Scholar
[8]
N. Achtziger, H. Gottschalk, T. Licht, J. Meier, U. Reisl¨ohner, M. R¨ub, W. Witthuhn, Appl. Phys. Lett. 66 p.2370 (1995).
Google Scholar
[9]
N. Achtziger, W. Witthuhn, Phys. Rev. B 57 (1998), p.12181.
Google Scholar
[10]
U. Reuss, W. Westmeier: γ - Ray Catalog, in: Atomic Data and Nuclear Data Tables Vol. 29, No. 1, (1983).
Google Scholar
[11]
P. Blood, J.W. Orton, The electrical characterization of semiconductors: majority carriers and electron states, (Academic Press, London, 1992), p.344 and p.426.
Google Scholar
[12]
J. Grillenberger, N. Achtziger, F. G¨unther, W. Witthuhn, Appl. Phys. Lett. 73 (1998), p.3698.
Google Scholar
[13]
N. Achtziger, G. Pasold, R. Sielemann, C. H¨ulsen, J. Grillenberger, W. Witthuhn, Phys. Rev. B 62, 12888 (2000).
DOI: 10.1103/physrevb.62.12888
Google Scholar
[14]
V.V. Afanas'ev, M. Bassler, G. Pensl, M.J. Schulz, E. Stein von Kamienski, J. Appl. Phys. 79(6), 3108 (1996). ∗ corresponding author: fax: +49 3641/947302, e-mail: pasold@pinet. uni-jena. de.
Google Scholar