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9 March 2023 High concentration large-mode-area Tm-doped double-clad fiber for high efficiency operation
Stefan Gausmann, Benoit Faugas, Joshua Bradford, Mark Goldsmith, Adrian Carter, Kanishka Tankala, Clemence Jollivet
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Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000L (2023) https://doi.org/10.1117/12.2650126
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Continued recent developments in Thulium- (Tm) doped silica fiber design have enabled average power scaling of 2 µm fiber laser system beyond the kW-level. One approach to furthering this development is to maximize the slope efficiency of Tm-doped fiber lasers by selecting highly-doped double-clad fibers (TDF’s) so as to promote the cross-relaxation process. The success of this approach was exemplified by Tumminelli et al. who employed an all-halide vapor-phase fabrication process to produce a single-mode (SM) fiber with a Tm concentration of 8.5 wt% and demonstrated ~70 % slope efficiency. In this work, we report what we believe to be the first high-concentration (8 wt% Tm), double-clad (DC) large-mode area (LMA) Tm-doped fiber (TDF), which was manufactured by the solution-doping MCVD process. Critical performance such as slope efficiency and lasing wavelength are characterized and compared to legacy LMA-TDF-25P/400 fiber.
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Stefan Gausmann, Benoit Faugas, Joshua Bradford, Mark Goldsmith, Adrian Carter, Kanishka Tankala, and Clemence Jollivet "High concentration large-mode-area Tm-doped double-clad fiber for high efficiency operation", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000L (9 March 2023); https://doi.org/10.1117/12.2650126
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KEYWORDS
Fiber lasers
Manufacturing
Single mode fibers
Thulium
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