1. M.J.F. Digonnet (ed.), Rare-Earth-Doped Fiber Lasers and Amplifiers, 2nd edn. (CRC Press/Taylor & Francis, Boca Raton, 2001)
2. H. Shalibeik, Rare-Earth-Doped Fiber Lasers and Amplifiers (Cuvillier, Göttingen, 2007)
3. J. Ruan, E. Wu, H. Zeng, S. Zhou, G. Lakshminarayana, J. Qiu, Appl. Phys. Lett. 92, 101121 (2008)
4. X. Wang, P. Zhou, Y. Ma, H. Ma, X. Xu, Z. Liu, Y. Zhao, J. Opt. 12, 075701 (2010)
5. T. Sakamoto, M. Shimizu, M. Yamada, T. Kanamori, Y. Ohishi, Y. Terunuma, S. Sudo, IEEE Photonics Technol. Lett. 8, 349 (1996)