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Proceedings Paper

Nd:Yb-codoped silica fibers for high power fiber lasers: fluorescence and laser properties
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Paper Abstract

We have doped the core of Ytterbium (Yb) laser fibers additionally with Neodymium (Nd) to exploit wavelength-multiplexed high-power pump systems, which are commercially available. By pumping such a Nd:Yb-codoped fiber with the 808/940/978 nm-diode system, we could demonstrate CW output powers of more than 1 kW with high laser slope efficiency. In order to get a better understanding of this laser medium, we studied the fluorescence and the laser behavior of Nd:Yb fibers with different rare earth concentrations in comparison to a fiber doped solely with Nd. A theoretical model for the calculation of the fluorescence decay curve and spectrum as well as the laser characteristic and wavelength was developed, that takes the energy transfer process from Nd to Yb ions into account. Comparing the experimental and theoretical results, the behavior of the Nd:Yb high power fiber laser is understood as a collective emission of both ion types within the same wavelength region. These investigations contribute to the optimization of high power fiber lasers under the viewpoint of thermal load.

Paper Details

Date Published: 22 April 2005
PDF: 10 pages
Proc. SPIE 5709, Fiber Lasers II: Technology, Systems, and Applications, (22 April 2005); doi: 10.1117/12.593408
Show Author Affiliations
Sylvia Jetschke, Institute for Physical High Technology (Germany)
Volker Reichel, Institute for Physical High Technology (Germany)
Klaus Moerl, Institute for Physical High Technology (Germany)
Sonja Unger, Institute for Physical High Technology (Germany)
Ulrich Roepke, Institute for Physical High Technology (Germany)
Hans-Rainer Mueller, Institute for Physical High Technology (Germany)


Published in SPIE Proceedings Vol. 5709:
Fiber Lasers II: Technology, Systems, and Applications
L. N. Durvasula; Andrew J. W. Brown; Johan Nilsson, Editor(s)

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