Origin and evolution of phase-shifts in high-power fiber laser systems: Detailed insights into TMI
Jauregui C, Stihler C, Tuennermann A, Limpert J (2019)
Publication Type: Conference contribution
Publication year: 2019
Journal
Publisher: SPIE
Book Volume: 10897
Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering
Event location: San Francisco, CA, USA
ISBN: 9781510624368
DOI: 10.1117/12.2508854
Abstract
In this work, we study the generation and evolution of phase-shifts between the modal interference pattern and the thermally-induced index grating due to pump-power changes. This study is not only important to understand new mitigation strategies based on controlling such phase-shifts, but also to comprehend how pump/signal noise can trigger TMI. Understanding how such a phase-shift can develop from a pump/signal change is not trivial, since the movement of both the MIP and the RIG are thermally driven and, therefore, should have similar time constants. Our simulations show unequivocally that a change of the pump power will lead to the generation of a phase-shift and the physical reason for this behavior is unveiled. The main reason is an increased sensitivity of the MIP to temperature variations because the local beat-length changes of the MIP are accumulated along the whole fiber length. Therefore, the further downstream the fiber a MIP maximum is (i.e. closer to the pump end in a counter-pumped configuration), the stronger and faster its position shift will be. This insight shows a way to obtain more TMI-resilient fiber designs and may help understanding the core area dependence of TMI.
Involved external institutions
Germany (DE)How to cite
APA:
Jauregui, C., Stihler, C., Tuennermann, A., & Limpert, J. (2019). Origin and evolution of phase-shifts in high-power fiber laser systems: Detailed insights into TMI. In Adrian L. Carter, Liang Dong (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.
MLA:
Jauregui, Cesar, et al. "Origin and evolution of phase-shifts in high-power fiber laser systems: Detailed insights into TMI." Proceedings of the Fiber Lasers XVI: Technology and Systems 2019, San Francisco, CA, USA Ed. Adrian L. Carter, Liang Dong, SPIE, 2019.
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