Mode coupling in large-mode-area double-cladding chirped and tilted fiber Bragg gratings

被引：7
作者：
Rao, Binyu [1 ,2 ]
Zhao, Xiaofan [1 ,2 ]
Li, Hongye [1 ,2 ]
Tian, Xin [1 ,2 ]
Wang, Meng [1 ,2 ,3 ]
Wang, Zefeng [1 ,2 ,3 ]
机构：
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Peoples R China
[2] State Key Lab Pulsed Power Laser Technol, Changsha 410073, Peoples R China
[3] Hunan Prov Key Lab High Energy Laser Technol, Changsha 410073, Peoples R China
来源：
OPTICS EXPRESS | 2021年 / 29卷 / 07期
基金：
中国国家自然科学基金;
关键词：
STIMULATED RAMAN-SCATTERING; SUPPRESSION; FABRICATION;
D O I：
10.1364/OE.420771
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Recently, chirped and tilted fiber Bragg gratings (CTFBGs) have received great attention because they can realize suppression of stimulated Raman scattering (SRS) in high-power fiber lasers. In this study, the possible coupling between the core modes and cladding modes in CTFBGs inscribed in large-mode-area double-cladding fibers is investigated for the first time. Theoretical results show that the coupling between the LP11 mode and cladding modes would destroy the transmission spectra envelope only considering the coupling of LP01 for single-mode CTFBGs, which will degenerate the SRS suppression performance. This was confirmed experimentally by measuring the spectral response under different mode excitations. A reliable method is demonstrated to ease the LP11-excitation-induced spectral deterioration by choosing an appropriate chirp rate for the inscription of CTFBGs, which is useful for improving the Raman suppression effect of large-mode-area double-cladding CTFBGs in high-power fiber lasers. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：11277 / 11292
页数：16
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