All-solid antiresonant fiber design with hybrid light guidance mechanism

Charu Goel; Seongwoo Yoo; Wonkeun Chang

doi:10.1117/12.2647550

8 March 2023 All-solid antiresonant fiber design with hybrid light guidance mechanism

Charu Goel, Seongwoo Yoo, Wonkeun Chang

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000X (2023) https://doi.org/10.1117/12.2647550
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Large mode area (LMA) fibers form an important part of high-power fiber lasers. There is significant research interest in achieving larger mode field area (MFA) for output power scaling and it is equally desirable to have single-mode operation in these fibers to maintain a good beam quality and suppress transverse mode instabilities. An increase in MFA is typically associated with high sensitivity to bend-induced losses and mode-shrinkage, necessitating several ultra-LMA fiber designs to be supported by thick outer jackets to form a rod-shape fiber. We present a hybrid light guidance mechanism in an all-solid antiresonant fiber, which combines antiresonance guidance with total internal reflection guidance to reduce the confinement loss and bending-induced losses by orders of magnitude. Low-index rods are strategically placed in the cladding to cover the gaps between the antiresonant elements to reduce confinement loss in straight fiber and suppress bending-induced leakage loss by orders of magnitude. We present detailed numerical analysis of a typical hybrid-guidance antiresonant fiber (HGARF) with core diameter 80 μm, optimized for operation in 1 μm wavelength range. The wavelength range of operation in the HGARF is decided solely by the wall thickness of the antiresonant elements and therefore the design principles can be extended to the 2 μm wavelength range.

Conference Presentation

Citation Download Citation

Charu Goel, Seongwoo Yoo, and Wonkeun Chang "All-solid antiresonant fiber design with hybrid light guidance mechanism", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000X (8 March 2023); https://doi.org/10.1117/12.2647550

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