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Proceedings Paper

High peak power amplification in large-core all-solid Yb fibers with an index-elevated pump clad and a low numerical aperture core
Author(s): M. Leich; Wenbin He; S. Grimm; J. Kobelke; Yuan Zhu; B. Müller; Jörg Bierlich; H. Bartelt; M. Jäger
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Paper Abstract

We report on the development of large-core Yb-doped fibers with up to 100 μm core diameter and present first experimental results for high peak power amplification. The material for core and pump cladding was fabricated by Powder Sinter Technology. Using a high Al concentration we achieved a numerical aperture (NA) of 0.21 of the pump cladding and a core NA below 0.1. The rod-type fiber exhibits high pump absorption. Using a 0.55 m short fiber sample as the main amplifier in a 3-stage ns pulsed fiber Master Oscillator Power Amplifier system we achieved 3 ns output pulses with 360 kW peak power and 2 mJ pulse energy. We observed suppressed Stimulated Raman Scattering with respect to the signal pulses, which offers the possibility of further power scaling of such fiber amplifier systems.

Paper Details

Date Published: 4 March 2015
PDF: 6 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93440T (4 March 2015); doi: 10.1117/12.2078738
Show Author Affiliations
M. Leich, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Wenbin He, Leibniz-Institut für Photonische Technologien e.V. (Germany)
S. Grimm, Leibniz-Institut für Photonische Technologien e.V. (Germany)
J. Kobelke, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Yuan Zhu, Leibniz-Institut für Photonische Technologien e.V. (Germany)
B. Müller, Leibniz-Institut für Photonische Technologien e.V. (Germany)
Jörg Bierlich, Leibniz-Institut für Photonische Technologien e.V. (Germany)
H. Bartelt, Leibniz-Institut für Photonische Technologien e.V. (Germany)
M. Jäger, Leibniz-Institut für Photonische Technologien e.V. (Germany)


Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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