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4 March 2022 Investigations towards easy-to-fabricate effective athermal fibers for high average power lasers
Gonzalo Palma-Vega, Stefan Kuhn, Johannes Nold, Till Walbaum, Nicoletta Haarlammert, Thomas Schreiber
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Proceedings Volume PC11981, Fiber Lasers XIX: Technology and Systems; PC1198102 (2022) https://doi.org/10.1117/12.2606536
Event: SPIE LASE, 2022, San Francisco, California, United States
Abstract
We investigate simplified fiber designs to mitigate thermal effects that limit the power scaling of large-mode area high-average power fiber lasers. We discuss the advantages of lowering the thermo-optical coefficient of the Yb active-doped core for different fiber designs. We demonstrate that mode shrinking can be fully suppressed not only in step index fibers, but also in more advanced ones such as large pitch fibers. Additionally, this approach will lead to a mitigation of transversal mode instabilities. We present first results with a step index fiber, where the influences of the co-dopants used to decrease the thermo-optical coefficient are discussed.
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Gonzalo Palma-Vega, Stefan Kuhn, Johannes Nold, Till Walbaum, Nicoletta Haarlammert, and Thomas Schreiber "Investigations towards easy-to-fabricate effective athermal fibers for high average power lasers", Proc. SPIE PC11981, Fiber Lasers XIX: Technology and Systems, PC1198102 (4 March 2022); https://doi.org/10.1117/12.2606536
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KEYWORDS
Optical fibers
Step index fibers
Thermography
Active optics
Fiber amplifiers
Fiber lasers
Thermal effects
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