Frequency resolved transverse mode instability in rod fiber amplifiers

Mette Marie Johansen; Marko Laurila; Martin D. Maack; Danny Noordegraaf; Christian Jakobsen; Thomas Tanggaard Alkeskjold; Jesper Lægsgaard

doi:10.1364/OE.21.021847

Frequency resolved transverse mode instability in rod fiber amplifiers

Mette Marie Johansen, Marko Laurila, Martin D. Maack, Danny Noordegraaf, Christian Jakobsen, Thomas Tanggaard Alkeskjold, Jesper Lægsgaard

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Abstract

Frequency dynamics of transverse mode instabilities (TMIs) are investigated by testing three 285/100 rod fibers in a single-pass amplifier setup reaching up to ~200W of extracted output power without beam instabilities. The pump power is increased well above the TMI threshold to uncover output dynamics, and allowing a simple method for determining TMI threshold based on standard deviation. The TMI frequency component is seen to appear on top of system noise that may trigger the onset. A decay of TMI threshold with test number is identified, but the threshold is fully recovered between testing to the level of the pristine fiber by thermal annealing the fiber output end to 300°C for 2 h.

Original language	English
Journal	Optics Express
Volume	21
Issue number	19
Pages (from-to)	21847-21856
ISSN	1094-4087
DOIs	https://doi.org/10.1364/OE.21.021847
Publication status	Published - 2013

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-19-21847. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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title = "Frequency resolved transverse mode instability in rod fiber amplifiers",

abstract = "Frequency dynamics of transverse mode instabilities (TMIs) are investigated by testing three 285/100 rod fibers in a single-pass amplifier setup reaching up to ~200W of extracted output power without beam instabilities. The pump power is increased well above the TMI threshold to uncover output dynamics, and allowing a simple method for determining TMI threshold based on standard deviation. The TMI frequency component is seen to appear on top of system noise that may trigger the onset. A decay of TMI threshold with test number is identified, but the threshold is fully recovered between testing to the level of the pristine fiber by thermal annealing the fiber output end to 300°C for 2 h. ",

author = "Johansen, {Mette Marie} and Marko Laurila and Maack, {Martin D.} and Danny Noordegraaf and Christian Jakobsen and Alkeskjold, {Thomas Tanggaard} and Jesper L{\ae}gsgaard",

note = "This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-19-21847. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.",

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doi = "10.1364/OE.21.021847",

language = "English",

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T1 - Frequency resolved transverse mode instability in rod fiber amplifiers

AU - Johansen, Mette Marie

AU - Laurila, Marko

AU - Maack, Martin D.

AU - Noordegraaf, Danny

AU - Jakobsen, Christian

AU - Alkeskjold, Thomas Tanggaard

AU - Lægsgaard, Jesper

N1 - This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-19-21847. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

PY - 2013

Y1 - 2013

N2 - Frequency dynamics of transverse mode instabilities (TMIs) are investigated by testing three 285/100 rod fibers in a single-pass amplifier setup reaching up to ~200W of extracted output power without beam instabilities. The pump power is increased well above the TMI threshold to uncover output dynamics, and allowing a simple method for determining TMI threshold based on standard deviation. The TMI frequency component is seen to appear on top of system noise that may trigger the onset. A decay of TMI threshold with test number is identified, but the threshold is fully recovered between testing to the level of the pristine fiber by thermal annealing the fiber output end to 300°C for 2 h.

AB - Frequency dynamics of transverse mode instabilities (TMIs) are investigated by testing three 285/100 rod fibers in a single-pass amplifier setup reaching up to ~200W of extracted output power without beam instabilities. The pump power is increased well above the TMI threshold to uncover output dynamics, and allowing a simple method for determining TMI threshold based on standard deviation. The TMI frequency component is seen to appear on top of system noise that may trigger the onset. A decay of TMI threshold with test number is identified, but the threshold is fully recovered between testing to the level of the pristine fiber by thermal annealing the fiber output end to 300°C for 2 h.

U2 - 10.1364/OE.21.021847

DO - 10.1364/OE.21.021847

M3 - Journal article

SN - 1094-4087

VL - 21

SP - 21847

EP - 21856

JO - Optics Express

JF - Optics Express

IS - 19

ER -

Frequency resolved transverse mode instability in rod fiber amplifiers

Abstract

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