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

Kristian Rymann Hansen; Jesper Lægsgaard

doi:10.1364/OE.22.011267

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

Kristian Rymann Hansen, Jesper Lægsgaard

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Abstract

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

Original language	English
Journal	Optics Express
Volume	22
Issue number	9
Pages (from-to)	11267-11278
ISSN	1094-4087
DOIs	https://doi.org/10.1364/OE.22.011267
Publication status	Published - 2014

Keywords

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

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abstract = "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",

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AB - 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

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KW - High-power fiber amplifiers

KW - Mode instabilities

KW - Saturated amplifiers

KW - Semi-analytical

KW - Transverse mode

KW - Amplifiers (electronic)

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

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