Simplified modelling the mode instability threshold of high power fiber amplifiers in the presence of photodarkening

被引：133
作者：
Jauregui, Cesar [1 ]
Otto, Hans-Juergen [1 ]
Stutzki, F. [1 ]
Limpert, J. [1 ,2 ]
Tuennermann, A. [1 ,2 ,3 ]
机构：
[1] Univ Jena, Inst Appl Phys, Abbe Ctr Photon, Albert Einstein Str 15, 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 | 2015年 / 23卷 / 16期
基金：
欧洲研究理事会;
关键词：
YTTERBIUM-DOPED FIBER; PHOTONIC-CRYSTAL FIBER; LASER SYSTEMS; SINGLE-FREQUENCY; GAIN SATURATION; OUTPUT POWER; IMPACT; MITIGATION; EXCITATION; ORIGIN;
D O I：
10.1364/OE.23.020203
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper we present a simple model to predict the behavior of the transversal mode instability threshold when different parameters of a fiber amplifier system are changed. The simulation model includes an estimation of the photodarkening losses which shows the strong influence that this effect has on the mode instability threshold and on its behavior. Comparison of the simulation results with experimental measurements reveal that the mode instability threshold in a fiber amplifier system is reached for a constant average heat load value in good approximation. Based on this model, the expected behavior of the mode instability threshold when changing the seed wavelength, the seed power and/or the fiber length will be presented and discussed. Additionally guidelines for increasing the average power of fiber amplifier systems will be provided. (C) 2015 Optical Society of America
引用
收藏
页码：20203 / 20218
页数：16
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