Bragg光栅随机阵列多模梯度折射率光纤及其拉曼激光特性

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fibers Pub Date : 2023-05-24 DOI:10.3390/fib11060048

A. Kuznetsov, A. Wolf, Zh.E. Munkueva, A. Dostovalov, S. Babin

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引用次数: 1

摘要

众所周知，多模光纤中的光传播会经历各种非线性效应，目前正在积极研究这些效应。其中一个有趣的效应是梯度折射率（GRIN）光纤中多模光束在拉曼转换时的亮度增强，这是由于拉曼放大时的光束清理和基于具有特殊横向结构的光纤布拉格光栅（FBG）的拉曼激光腔中的模式选择反馈。也可以探索基于GRIN光纤中自然折射率波动的瑞利反向散射的随机分布反馈，但它相当弱，需要非常高功率的多模泵浦才能产生随机激光。在这里，我们报道了首次在GRIN光纤中实现弱随机间隔FBG的飞秒脉冲内接阵列，并研究了高多模（M2~34）940nm激光二极管在其直接泵浦下的拉曼激光。所制造的1D–3D FBG阵列与1公里光纤中的高反射输入FBG一起用作复杂的输出镜。在高于阈值泵浦功率（~100W）的情况下，斯托克斯光束在976nm处获得随机激光，在174W泵浦下输出功率超过28W。不同阵列的光束质量参数不同，由于干涉效应，在线宽变窄至0.1–0.2 nm时达到M2~2，2D阵列的特性最好。

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Multimode Graded Index Fiber with Random Array of Bragg Gratings and Its Raman Lasing Properties

Light propagation in multimode fibers is known to experience various nonlinear effects, which are being actively studied. One of the interesting effects is the brightness enhancement at the Raman conversion of the multimode beam in graded index (GRIN) fiber due to beam cleanup at Raman amplification and mode selective feedback in the Raman laser cavity based on fiber Bragg gratings (FBGs) with special transverse structure. It is also possible to explore random distributed feedback based on Rayleigh backscattering on natural refractive index fluctuations in GRIN fibers, but it is rather weak, requiring very high power multimode pumping for random lasing. Here, we report on the first realization of femtosecond pulse-inscribed arrays of weak randomly spaced FBGs in GRIN fibers and study Raman lasing at its direct pumping by highly multimode (M2~34) 940-nm laser diodes. The fabricated 1D–3D FBG arrays are used as a complex output mirror, together with the highly reflective input FBG in 1-km fiber. Above threshold pump power (~100 W), random lasing of the Stokes beam at 976 nm is obtained with output power exceeding 28 W at 174 W pumping. The beam quality parameter varies for different arrays, reaching M2~2 at the linewidth narrowing to 0.1–0.2 nm due to the interference effects, with the best characteristics for the 2D array.

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来源期刊

Fibers Engineering-Civil and Structural Engineering

CiteScore

7.00

自引率

7.70%

发文量

审稿时长

11 weeks

期刊介绍： Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. 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 or 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. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins