Presentation
14 March 2018 Single-frequency and single-mode fiber amplifier at 1.5-μm core-pumped at 1018 nm (Conference Presentation)
Omar de Varona Ortega, Michael Steinke, Dietmar Kracht, Jörg Neumann, Peter Wessels
Author Affiliations +
Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105120K (2018) https://doi.org/10.1117/12.2289715
Event: SPIE LASE, 2018, San Francisco, California, United States
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.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Omar de Varona Ortega, Michael Steinke, Dietmar Kracht, Jörg Neumann, and Peter Wessels "Single-frequency and single-mode fiber amplifier at 1.5-μm core-pumped at 1018 nm (Conference Presentation)", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120K (14 March 2018); https://doi.org/10.1117/12.2289715
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KEYWORDS
Fiber amplifiers

Optical amplifiers

Absorption

Single mode fibers

High power fiber amplifiers

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