Temporal dynamics of mode instabilities in high-power fiber lasers and amplifiers

被引：258

作者：

Otto, Hans-Juergen ^{[1
]}

Stutzki, Fabian ^{[1
]}

Jansen, Florian ^{[1
]}

Eidam, Tino ^{[1
,2
]}

Jauregui, Cesar ^{[1
]}

Limpert, Jens ^{[1
,2
]}

Tuennermann, Andreas ^{[1
,2
,3
]}

机构：

[1] Univ Jena, Inst Appl Phys, Abbe Ctr Photon, D-07745 Jena, Germany

[2] Helmholtz Inst Jena, D-07743 Jena, Germany

[3] Fraunhofer Inst Appl Opt & Precis Engn, D-07745 Jena, Germany

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 14期

基金：

欧洲研究理事会;

关键词：

PHOTONIC-CRYSTAL FIBER; IMPACT;

D O I：

10.1364/OE.20.015710

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The temporal behavior of mode instabilities in active large mode area fibers is experimentally investigated in detail. Thus, apart from the onset threshold of mode instabilities, the output beam is characterized using both high-speed camera measurements with 20,000 frames per second and photodiode traces. Based on these measurements, an empiric definition of the power threshold of mode instabilities is introduced. Additionally, it is shown that the temporal dynamics show a transition zone between the stable and the unstable regimes where well-defined periodic temporal fluctuations on ms-timescale can be observed. Finally, it is experimentally shown that the larger the mode-field area, the slower the mode-instability fluctuation is. The observations support the thermal origin of mode instabilities. (C) 2012 Optical Society of America

引用

页码：15710 / 15722

页数：13

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