Innovative fused end fiber bundle technology for high-brightness, irregular beam profiles

K. Alps

doi:10.1117/12.2648342

14 March 2023 Innovative fused end fiber bundle technology for high-brightness, irregular beam profiles

K. Alps

Proceedings Volume 12403, High-Power Diode Laser Technology XXI; 124030N (2023) https://doi.org/10.1117/12.2648342
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Innovative technology dispels the myth, that silica/silica, step index, multimode fiber bundles are lossy. This technology provides a number of gains, allowing to push the boundaries in fiber bundling technology: freedom of fiber bundle end shapes and dimensions, wide angle of light acceptance cone, what is described by high numerical aperture (NA) values, packing of fibers in honeycomb-like structures with fill factors close to 1, utility of low refractive index surrounding medium and good heat management of mis-coupled light. The latest technology allows the design of larger NA light coupling systems gaining output power density. Both are studied in this paper – high-OH and low-OH content core - fiber bundles, evaluating performance at high power, large angle of incidence (AOI) light sources. For comparison purposes various fiber bundles were produced differing by utilized bundle end treatment technology. There are compared four different fiber bundle end treatment technologies - glued, fused in silica capillary tube and two latest technology options. There is a proposed transmission measurement setup, that allows a change NA of incident light coupled in the fiber bundle from 0.10 to 0.60. Measurement data at ultraviolet (UV), visible (VIS) and near-infrared (NIR) wavelengths are compiled in graphs for comparison purposes. Results show that the new generation fiber bundles are suitable for low loss applications as the source to fiber bundle coupling is improved when compared with any known fiber bundle end treatment technology. Finally, the new technology allows the implementation of cladding mode stripping – this technology was not possible to utilize with previous generation fiber bundles.

Conference Presentation

Citation Download Citation

K. Alps "Innovative fused end fiber bundle technology for high-brightness, irregular beam profiles", Proc. SPIE 12403, High-Power Diode Laser Technology XXI, 124030N (14 March 2023); https://doi.org/10.1117/12.2648342

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