Spatial beam self-cleaning in bi-tapered multimode fibers
Abstract
We report the spatial beam self-cleaning in bi-tapered conventional multimode fibers (MMFs) with different tapered lengths. Through the introduction of the bi-tapered structure in MMFs, the input beam with poor beam quality from a high-power fiber laser can be converted to a centered, bell-shaped beam in a short length, due to the strengthened nonlinear modes coupling. It is found that the bi-tapered MMF with longer tapered length at the same waist diameter shows better beam self-cleaning effect and larger spectral broadening. The obtained results offer a new method to improve the beam quality of high-power laser at low cost. Besides, it may be interesting for manufacturing bi-tapered MMF-based devices to obtain the quasi-fundamental mode beam in spatiotemporal mode-locked fiber lasers.
Keywords
Cite
@article{arxiv.2107.03871,
title = {Spatial beam self-cleaning in bi-tapered multimode fibers},
author = {Xiao-Jun Lin and Yu-Xin Gao and Jin-Gan Long and Jia-Wen Wu and Xiang-Yue Li and Wei-Yi Hong and Hu Cui and Zhi-Chao Luo and Wen-Cheng Xu and Ai-Ping Luo},
journal= {arXiv preprint arXiv:2107.03871},
year = {2021}
}