Trench-assisted large mode area fiber for high power fiber lasers

Jain, D. and Sahu, J.K. (2014) Trench-assisted large mode area fiber for high power fiber lasers. IONS-KOALA International OSA Network of Students & Conference on Optics, Atoms and Laser Applications, Adelaide, Australia. 23 - 28 Nov 2014.

Abstract

High power fiber lasers have tremendously contributed to mankind for high power fiber laser applications. Now fiber lasers are being as seen as the potential candidates for next-generation particle accelerators, nuclear transmutation, nuclear waste treatment, astrophysics, and other industrial applications. Unfortunately, non-linear effects are detrimental to the power scaling and pose severe challenges for further power scaling. One route to increase output power level is to increase the effective area of the fundamental mode. However, increasing the core diameter to increase the effective area of the fundamental mode leads to propagation of several modes and deteriorates the output beam quality. Hence, a trade-off exists between large effective area and beam quality for power scaling. Several large mode area fiber designs have been proposed to achieve effective single-mode operation by offering suppression to the higher order modes. However, these fiber designs are difficult to fabricate and suffers from several other problems.
We have proposed a novel all-solid "trench assisted" fiber designs, which are easy to fabricate and offer significant enhancement to mode area scaling capability. Fiber having core diameter as large as 90µm has been experimentally demonstrated to guide single mode operation. We believe that these designs offer potential to address the challenges being faced by high power fiber lasers.

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Contributors

Author: J.K. Sahu

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