Double-parabola Yb 3+ -doped fiber for 5.58 kW high-brightness linearly polarized laser output
Year: 2025
Type: article
Abstract: A 5.58 kW narrow-linewidth linearly polarized single-mode fiber amplifier is demonstrated using a double-parabola active fiber. The fiber design ensures strong fundamental-mode selectivity under bending through its double-parabola refractive index and Yb 3+ -doped profiles, while stress zone modulation is applied to approach the cutoff condition of the fast-axis mode. The system ultimately delivers a 5.58 kW output with a broadened spectrum of 88.5 GHz for SBS suppression, while maintaining a polarization extinction ratio above 19.6 dB throughout the power scaling process and M 2 ∼ 1.1 at 5.2 kW, representing the highest power-beam quality-polarization combination at this level.
Source: Optics Express
DOI: 10.1364/oe.582000
Authors: Chang Shu, Shibiao Liao, Dongxu Chen, Fan Feng, Junjie Cheng, Yingbin Xing, Xiongwei Hu, Jinggang Peng, Nengli Dai, Jinyan Li
Institution: Huazhong University of Science and Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W4416857465