Seeing the strong suppression of higher order modes in single trench fiber using the S2 technique

被引：9
作者：
An, Yi [1 ]
Yang, Huan [1 ,2 ]
Chen, Xiao [1 ]
Huang, Liangjin [1 ,2 ]
Yan, Zhiping [1 ]
Pan, Zhiyong [1 ]
Wang, Zefeng [1 ,2 ]
Jiang, Zongfu [1 ]
Zhou, Pu [1 ]
机构：
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China
[2] Natl Univ Def Technol, Nanhu Laser Lab, Changsha 410073, Peoples R China
来源：
OPTICS LETTERS | 2023年 / 48卷 / 01期
基金：
中国国家自然科学基金;
关键词：
RESOLVED BEND-LOSS; HIGH-POWER; MODAL DECOMPOSITION; CORE; DESIGN; LASER;
D O I：
10.1364/OL.478287
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The single trench fiber (STF) is a promising fiber design for mode area scaling and higher order mode (HOM) suppression. In this Letter, we experimentally demonstrate the strong HOM-suppression in a homemade STF using the spatially and spectrally resolved imaging (S2) technique. This STF has a 20-mu m core and its performance is compared to a conventional step-index fiber with almost the same parameter. Results show that the bending loss of the HOM in STF is 8-times larger than conventional fiber at a bend radius of 7 cm. In addition, when severe coupling mismatch is introduced at the input end of the fiber, the STF can keep the fundamental-mode output while the conventional fiber cannot. To the best of our knowledge, this is the first time to experimentally analyze the HOM content in an STF and compare its performance with that of a conventional fiber. Our results indicate the great potential of the STF for filtering the HOM in fiber laser applications. (c) 2022 Optica Publishing Group
引用
收藏
页码：61 / 64
页数：4
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