Impact of the central refractive index dip of fibers on high-power applications

Yi An; Yi An; Yi An; Xiao Chen; Xiao Chen; Xiao Chen; Yankun Ren; Yankun Ren; Yankun Ren; Hanshuo Wu; Hanshuo Wu; Hanshuo Wu; Liangjin Huang; Liangjin Huang; Liangjin Huang; Zhiyong Pan; Zhiyong Pan; Zhiyong Pan; Zongfu Jiang; Zongfu Jiang; Zongfu Jiang; Pu Zhou

doi:10.3389/fphy.2023.1177371

Frontiers in Physics (Apr 2023)

Impact of the central refractive index dip of fibers on high-power applications

Yi An,
Yi An,
Yi An,
Xiao Chen,
Xiao Chen,
Xiao Chen,
Yankun Ren,
Yankun Ren,
Yankun Ren,
Hanshuo Wu,
Hanshuo Wu,
Hanshuo Wu,
Liangjin Huang,
Liangjin Huang,
Liangjin Huang,
Zhiyong Pan,
Zhiyong Pan,
Zhiyong Pan,
Zongfu Jiang,
Zongfu Jiang,
Zongfu Jiang,
Pu Zhou

Affiliations

Yi An: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Yi An: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Yi An: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Xiao Chen: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Xiao Chen: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Xiao Chen: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Yankun Ren: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Yankun Ren: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Yankun Ren: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Hanshuo Wu: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Hanshuo Wu: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Hanshuo Wu: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Liangjin Huang: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Liangjin Huang: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Liangjin Huang: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Zhiyong Pan: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Zhiyong Pan: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Zhiyong Pan: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Zongfu Jiang: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Zongfu Jiang: Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
Zongfu Jiang: Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
Pu Zhou: College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China

DOI: https://doi.org/10.3389/fphy.2023.1177371
Journal volume & issue: Vol. 11

Abstract

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Central refractive index dip is a common phenomenon in the fibers fabricated by the modified chemical vapor deposition (MCVD) technology, which is the main fabrication technique for high-power laser fibers. In this paper, we present a numerical analysis of the dip effect on high-power-related parameters for the first time, to the best of our knowledge. Three aspects including mode field parameter, beam quality, and bending performance are studied under different dip parameters and bending radii. It is found that the dip is possible to increase the effective mode area and the bending loss, which offers a flexible way to suppress the non-linear effects and filter the higher-order modes by optimizing the dip parameters. Besides, different from the mode area and bending loss, beam quality exhibits an interesting trend when the dip radius increases. The results could facilitate a comprehensive understanding of the dip fiber properties, which also offer guidance to evaluate and design the fiber with central refractive index dip for high-power applications.

Published in Frontiers in Physics

ISSN: 2296-424X (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science: Physics
Website: https://www.frontiersin.org/journals/physics

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