High-precision adjustment of the refractive index in high-power laser fibers

Nicoletta Haarlammert; Johannes Nold; Gonzalo Palma-Vega; Stefan Kuhn; Jens Limpert; Thomas Schreiber

doi:10.1117/12.3000567

12 March 2024 High-precision adjustment of the refractive index in high-power laser fibers

Nicoletta Haarlammert, Johannes Nold, Gonzalo Palma-Vega, Stefan Kuhn, Jens Limpert, Thomas Schreiber

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 128650G (2024) https://doi.org/10.1117/12.3000567
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

A manufacturing chain that revolutionizes the production of fibers with highly precise refractive index matching is presented. By integrating iterative refractive index adjustments using reference fibers, a remarkable improvement in homogeneity, reaching 1E-5, was achieved. Conventional methods, such as the MCVD process, are limited to approximately 1E-4. This enhanced precision was demonstrated through meticulous measurements of core materials and validated in the final fiber. Importantly, the presented manufacturing method considers that the refractive index of fused silica is not a fixed property of the material. It depends on the thermal treatment history and the exact conditions during fiber drawing. This breakthrough manufacturing process ensures the reproducible manufacturing of fibers with fundamental mode guiding properties and mode field diameters exceeding 100 μm. These specialized fibers play a pivotal role in scaling the power of fiber lasers for ultrashort pulse applications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nicoletta Haarlammert, Johannes Nold, Gonzalo Palma-Vega, Stefan Kuhn, Jens Limpert, and Thomas Schreiber "High-precision adjustment of the refractive index in high-power laser fibers", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 128650G (12 March 2024); https://doi.org/10.1117/12.3000567

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