532 nm pump induced photo-darkening inhibition and photo-bleaching in high power Yb-doped fiber amplifiers

被引：18

作者：

Cao, Ruiting ^{[1
]}

Lin, Xianfeng ^{[1
]}

Chen, Yisha ^{[1
]}

Cheng, Yongshi ^{[1
]}

Wang, Yibo ^{[1
]}

Xing, Yingbin ^{[1
]}

Li, Haiqing ^{[1
]}

Yang, Luyun ^{[1
]}

Chen, Gui ^{[1
]}

Li, Jinyan ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, WNLO, Wuhan 430074, Hubei, Peoples R China

来源：

OPTICS EXPRESS | 2019年 / 27卷 / 19期

基金：

中国国家自然科学基金;

关键词：

ALUMINOSILICATE FIBERS; LASER FIBERS; LUMINESCENCE; MITIGATION;

D O I：

10.1364/OE.27.026523

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel method for mitigating photo-darkening and the effective photo-bleaching phenomenon by 532 nm cladding pump in Yb-doped fiber were herein reported. Compared with the pristine fiber, beyond 30% of photo-darkening induced excess loss was suppressed by 532 nm pretreatment. Moreover, the excess loss in the photo-darkened fiber was completely bleached with 532 nm pump. Additionally, the bleached fiber exhibited better photo-darkening resistance. Therefore, for high power application, a 20/400 gamma irradiated fiber was bleached in situ by 532 nm pump and the laser properties were explored. The output power restored to 421W accounting for 82% of the pristine fiber, with the mode instability threshold rising to over 2.6 times and the efficiency increasing from 37% to 63%. The results indicate 532 nm pump has bright prospects for the stable operation of high power fiber lasers. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：26523 / 26531

页数：9

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