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Journal article

Impact of gain saturation on the mode instability threshold in high-power fiber amplifiers

In Optics Express — 2014, Volume 22, Issue 9, pp. 11267-11278

By Hansen, Kristian Rymann1; Lægsgaard, Jesper1,2,3

From

Department of Photonics Engineering, Technical University of Denmark1

Fibers & Nonlinear Optics, Department of Photonics Engineering, Technical University of Denmark2

Fiber Optics, Devices and Non-linear Effects, Department of Photonics Engineering, Technical University of Denmark3

We present a coupled-mode model of transverse mode instability in high-power fiber amplifiers, which takes the effect of gain saturation into account. The model provides simple semi-analytical formulas for the mode instability threshold, which are valid also for highly saturated amplifiers. The model is compared to recently published detailed numerical simulations of mode instability, and we find reasonably good agreement with our simplified coupled-mode model. (C) 2014 Optical Society of America

Language: English
Year: 2014
Pages: 11267-11278
ISSN: 10944087
Types: Journal article
DOI: 10.1364/OE.22.011267
ORCIDs: Lægsgaard, Jesper
Keywords

Amplifiers (electronic) Gain saturation High-power fiber amplifiers LASERS Mode instabilities OPTICS Saturated amplifiers Semi-analytical Stability Transverse mode

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