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Proceedings Paper

Single-frequency and single-mode fiber amplifier at 1.5-μm core-pumped at 1018 nm (Conference Presentation)
Author(s): Omar de Varona Ortega; Michael Steinke; Dietmar Kracht; Jörg Neumann; Peter Wessels
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Paper Abstract

In the last years, great efforts have been made to power scale single-mode fiber amplifiers at 1.5μm. In this context, the advantages of Er:Yb co-doped fibers as active media have been widely accepted even though their limitation due to Yb-band ASE are well known. To overcome this limitation the novel technique of off-resonant pumping (e.g. at 940nm) has demonstrated to be effective in cladding-pumped amplifiers. However, the absorption cross-section of Er:Yb fibers at these wavelengths requires a long piece of fiber to achieve high pump power absorption. This is usually an issue in single-frequency systems, where high power levels in a large interaction length reduce the threshold of non-linearities. Nonetheless, the off-resonant technique has not been yet investigated in core-pumped systems because of the low power of single-mode pump sources at 940nm. In addition, the wavelengths longer than 980nm as main pump wavelength are neither sufficiently investigated. In this work we study the viability of the off-resonant pumping technique in purely single-mode systems core-pumped at 1018nm. A 6μm core Er:Yb fiber is core-pumped with a previously generated 1018nm signal and seeded with a single-frequency signal at 1.5μm. The output signal was scaled up to >3.2W before the onset of a significant amount of ASE in the 1μm band occurred. The optical efficiency was 30%. This work represents a proof of principle of a fiber amplifier core-pumped off-resonantly for single-frequency and purely single-mode applications.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120K (14 March 2018); doi: 10.1117/12.2289715
Show Author Affiliations
Omar de Varona Ortega, Laser Zentrum Hannover e.V. (Germany)
Michael Steinke, Laser Zentrum Hannover e.V. (Germany)
Dietmar Kracht, Laser Zentrum Hannover e.V. (Germany)
Jörg Neumann, Laser Zentrum Hannover e.V. (Germany)
Peter Wessels, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 10512:
Fiber Lasers XV: Technology and Systems
Ingmar Hartl; Adrian L. Carter, Editor(s)

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