Cutting-edge fused end fiber bundle technology for multi kW range applications

K. Alps; I. Brūvers; J. Grūbe; M. Narels

doi:10.1117/12.3000484

12 March 2024 Cutting-edge fused end fiber bundle technology for multi kW range applications

K. Alps, I. Brūvers, J. Grūbe, M. Narels

Proceedings Volume 12866, Components and Packaging for Laser Systems X; 1286603 (2024) https://doi.org/10.1117/12.3000484
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

The latest technology silica/silica, step-index multimode fiber bundle end treatment technology shows outstanding transmission all over the spectral range of silica material transparency. Fibers are fused in a honeycomb-like structure with a fill factor close to one while the fused end of the bundle is surrounded by a low refractive index medium. This allows us to consider the utility of new fiber bundles for low-loss, high-power applications where all until now-known fiber bundle end treatment technologies would fail. Large active area bundles remain flexible as they are loose along the longitudinal axis and only the tip of bundled fibers at the length are fused a few centimeters. Active areas can be shaped mixing curvatures, positive and negative angles with high repeatability and negligible deformations of individual fibers to fit the output of the source giving an advantage of expensive silica material economy. Furthermore, mirroring the shape of the light source output to bundle input benefits coupling efficiency especially for high NA (Numerical Aperture) coupling. This can increase output power density while the construction of the fused fiber bundle end allows designs with good heat management options. There are continued studies of Clad Fused Bundle (CFB) end treatment technology in this paper focusing on destructive tests and laser power threshold values at NIR (Near Infrared) with CW (Continuous Wave) sources. During the tests laser power is gradually increased to several kW and fiber bundle temperature changes are observed.

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

Citation Download Citation

K. Alps, I. Brūvers, J. Grūbe, and M. Narels "Cutting-edge fused end fiber bundle technology for multi kW range applications", Proc. SPIE 12866, Components and Packaging for Laser Systems X, 1286603 (12 March 2024); https://doi.org/10.1117/12.3000484

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KEYWORDS

Silica

Laser irradiation

Optical fibers

Temperature metrology

Continuous wave operation

Laser damage threshold

Reflection

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