1. Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power
2. H. Zellmer, A. Tünnermann, H. Welling, V. Reichel, in: OSA TOPS: Proceeding of OAA 16, 1997, p. 137.
3. 500 W continuous-wave fibre laser with excellent beam quality
4. Cladding-pumped ytterbium-doped large-core fiber laser with 610 W of output power
5. A. Liem, J. Limpert, H. Zellmer, A. Tünnermann, V. Reichel, K. Mörl, S. Jetschke, S. Unger, H.-R. Müller, J. Kirchhof, T. Sandrock, A. Harschak, in: Proceeding of Conference on Lasers and Electro-Optics 2004, San Francisco, USA, May 16–21, 2004, postdeadline paper CPDD2.