Origin of thermal modal instabilities in large mode area fiber amplifiers

Optics Express
B WardI Dajani

Abstract

We present a dynamic model of thermal modal instability in large mode area fiber amplifiers. This model allows the pump and signal optical intensity distributions to apply a time-varying heat load distribution within the fiber. This influences the temperature distribution that modifies the optical distributions through the thermo-optic effect thus creating a feedback loop that gives rise to time-dependent modal instability. We describe different regimes of operation for a representative fiber design. We find qualitative agreement between simulation results and experimental results obtained with a different fiber including the time-dependent behavior of the instability and the effects of different cooling configurations on the threshold. We describe the physical processes responsible for the onset of the instability and suggest possible mitigation approaches.

References

Mar 4, 2011·Optics Express·Cesar JaureguiAndreas Tünnermann
Jun 7, 2011·Optics Express·Tino EidamAndreas Tünnermann
Jun 7, 2011·Optics Express·Arlee V Smith, Jesse J Smith
Nov 24, 2011·Optics Express·Kristian Rymann HansenJesper Lægsgaard
Dec 6, 2011·Optics Letters·Fabian StutzkiAndreas Tünnermann
Mar 16, 2012·Optics Express·Florian JansenAndreas Tünnermann

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Citations

Sep 15, 2015·Applied Optics·Lei LiaoJinyan Li
Jun 21, 2012·Optics Express·Nicoletta HaarlammertAndreas Tünnermann
Aug 14, 2013·Optics Express·Cesar JaureguiAndreas Tünnermann
Feb 14, 2015·Optics Letters·Michael SteinkePeter Wessels
Nov 15, 2016·Optics Letters·Charles X YuThierry F Taunay
May 16, 2017·Optics Letters·Z Sanjabi EznavehR Amezcua-Correa
Aug 10, 2017·Optics Express·N Xia, S Yoo
Mar 16, 2018·Optics Letters·Franz BeierAndreas Tünnermann
Mar 14, 2019·Light, Science & Applications·Christoph StihlerJens Limpert
Dec 28, 2019·Optics Express·Shicheng ZhuXiuquan Ma
Mar 14, 2013·Optics Express·Arlee V Smith, Jesse J Smith
Jul 12, 2013·Optics Express·Mette Marie JohansenJesper Lægsgaard
Jul 12, 2013·Optics Express·Arlee V Smith, Jesse J Smith
Aug 19, 2016·Applied Optics·Romain DauliatPhilippe Roy
Jun 6, 2013·Optics Express·Benjamin G Ward
Jan 22, 2015·Optics Express·Maxim KuznetsovOleg Antipov
Feb 8, 2013·Optics Express·Kristian Rymann HansenJesper Lægsgaard
Mar 14, 2013·Optics Express·Liang Dong
Mar 5, 2013·Optics Letters·Florian JansenAndreas Tünnermann
Oct 10, 2013·Optics Express·Mette Marie JohansenJesper Lægsgaard
Jul 21, 2015·Optics Express·Hans-Jürgen OttoAndreas Tünnermann
Feb 3, 2016·Optics Express·Arlee V Smith, Jesse J Smith

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