Intensity noise as a driver for transverse mode instability in fiber amplifiers
Christoph Stihler,Christoph Stihler,Cesar Jauregui,Sobhy E. Kholaif,Sobhy E. Kholaif,Jens Limpert,Jens Limpert,Jens Limpert +7 more
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TLDR
In this article, a main driving force for transverse mode instability in fiber amplifiers is identified and the physical origin of this behavior is linked to the noise transfer function in saturated fiber amplifier, which can be concluded that suppression of pump-noise frequencies below 20 kHz could strongly increase the TMI threshold in high-power fiber laser systems.Abstract:
The effect of transverse mode instability (TMI) is currently the main limitation for the further average-power scaling of fiber laser systems with diffraction-limited beam quality. In this work a main driving force for TMI in fiber amplifiers is identified. Our experiments and simulations illustrate that the performance of fiber laser systems in terms of their diffraction-limited output power can be significantly reduced when the pump or seed radiation exhibit intensity noise. This finding emphasizes the fact that the TMI threshold is not only determined by the active fiber but, rather, by the whole system. In the experiment an artificially applied pump intensity-noise of 2.9% led to a reduction of the TMI threshold of 63%, whereas a similar seed intensity-noise decreased it by just 13%. Thus, even though both noise sources have an impact on the TMI threshold, the pump intensity-noise can be considered as the main driver for TMI in saturated fiber amplifiers. Additionally, the work unveils that the physical origin of this behavior is linked to the noise transfer function in saturated fiber amplifiers. With the gained knowledge and the experimental and theoretical results, it can be concluded that a suppression of pump-noise frequencies below 20 kHz could strongly increase the TMI threshold in high-power fiber laser systems.read more
Citations
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Journal ArticleDOI
Transverse mode instability
TL;DR: In this paper, the authors present a review on the effect of transverse mode instability in high-power fiber laser systems and the corresponding investigations led worldwide over the past decade, including a description of the experimental observations and the physical origin of this effect.
Journal ArticleDOI
Transverse Mode Instability
TL;DR: In this paper, the authors present a review on the effect of transverse mode instability in high-power fiber laser systems and the corresponding investigations led worldwide over the last decade, including the description of the experimental observations, the physical origin of this effect, as well as some of the proposed mitigation strategies.
Journal ArticleDOI
Experimental study on the impact of signal bandwidth on the transverse mode instability threshold of fiber amplifiers.
Shuai Ren,Wenchang Lai,Guang-zheng Wang,Wei Li,Jiaxin Song,Yisha Chen,Pengfei Ma,Wei Lu,Pu Zhou +8 more
TL;DR: In this article , the impact of signal bandwidth on the TMI threshold of fiber amplifiers has been investigated and the experimental results reveal that the threshold grows, keeps constant, and further grows as a function of spectral linewidth of seed lasers.
Journal ArticleDOI
Reconfigurable Parametric Amplifications of Spoof Surface Plasmons
TL;DR: In this paper, the concept of parametric amplification (PA) is transplanted to the plasmonics and is realized experimentally an ultrathin reconfigurable PA using a spoof SSPP (SSPP) waveguide integrated with tunable and nonlinear varactors.
Journal ArticleDOI
Accurate Modeling of Transverse Mode Instability in Fiber Amplifiers
TL;DR: In this article , a 3D fiber amplifier and stimulated thermal Rayleigh scattering are used to simulate the transverse mode instability of high-power fiber lasers. But the model is limited to situations where bend-induced mode distortion of the fundamental mode is negligible, but is still applicable for most practical scenarios.
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Cesar Jauregui,Jens Limpert,Jens Limpert,Jens Limpert,Andreas Tünnermann,Andreas Tünnermann,Andreas Tünnermann +6 more
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Femtosecond fiber CPA system emitting 830 W average output power.
Tino Eidam,Stefan Hanf,Enrico Seise,T. V. Andersen,T. Gabler,Christian Wirth,Thomas Schreiber,Jens Limpert,Andreas Tünnermann +8 more
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Journal ArticleDOI
Experimental observations of the threshold-like onset of mode instabilities in high power fiber amplifiers
Tino Eidam,Christian Wirth,Cesar Jauregui,Fabian Stutzki,Florian Jansen,Hans-Jürgen Otto,O. Schmidt,Thomas Schreiber,Jens Limpert,Andreas Tünnermann +9 more
TL;DR: The observation and experimental characterization of a threshold-like onset of mode instabilities, i.e. an apparently random relative power content change of different transverse modes, occurring in originally single-mode high-power fiber amplifiers is reported.