Experimental Study on Transverse Mode Instability of All-Fiber Single-Frequency Amplifier Based on Tapered Yb-Doped Fiber

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-07-26 DOI:10.3390/photonics11080696

Yue Tao, Zhengfei Mo, Pengrui Kang, Man Jiang, Can Li, Jin-yong Leng, Pu Zhou, Zongfu Jiang

引用次数: 0

Abstract

We experimentally studied the transverse mode instability (TMI) threshold of a linearly polarized single-frequency fiber laser amplifier constructed with tapered ytterbium-doped fiber (TYDF) under different bending diameters. The TMI threshold increased from 333 W to 451 W by reducing the bending diameter from 16 cm to 12 cm, which was accompanied by the deterioration of the beam quality from 1.47 to 1.67. The anomalous characteristics between the TMI threshold, bending diameter, and beam quality are mainly attributed to the decreased bending loss of higher-order mode (HOM) content as a result of the increased system heat loads caused by a tight bending-induced loss of amplification efficiency. It is believed that the presented results will provide useful guidelines for the design of high-power single-frequency fiber amplifiers.

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基于锥形掺镱光纤的全光纤单频放大器横模不稳定性实验研究

我们通过实验研究了使用锥形掺镱光纤（TYDF）构建的线性偏振单频光纤激光放大器在不同弯曲直径下的横模不稳定性（TMI）阈值。当弯曲直径从 16 厘米减小到 12 厘米时，TMI 门限从 333 W 上升到 451 W，同时光束质量从 1.47 下降到 1.67。TMI 门限、弯曲直径和光束质量之间的反常特性主要归因于高阶模式 (HOM) 内容的弯曲损耗减少，这是因为紧密弯曲引起的放大效率损失导致系统热负荷增加。相信这些结果将为大功率单频光纤放大器的设计提供有用的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.