Modal instability of rod fiber amplifiers: a semi-analytic approach

Mette Marie Jørgensen; Kristian Rymann Hansen; Marko Laurila; Thomas  Tanggaard Alkeskjold; Jesper Lægsgaard

doi:10.1117/12.2001412

Modal instability of rod fiber amplifiers: a semi-analytic approach

Mette Marie Jørgensen, Kristian Rymann Hansen, Marko Laurila, Thomas Tanggaard Alkeskjold, Jesper Lægsgaard

NKT Group

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.

Original language	English
Journal	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	8601
Pages (from-to)	860123
Number of pages	8
ISSN	1605-7422
DOIs	https://doi.org/10.1117/12.2001412
Publication status	Published - 2013
Event	SPIE Photonics West LASE 2013 - San Francisco, United States Duration: 2 Feb 2013 → 7 Feb 2013

Conference

Conference	SPIE Photonics West LASE 2013
Country/Territory	United States
City	San Francisco
Period	02/02/2013 → 07/02/2013

Keywords

Fiber amplifiers
Modal instability
Microstructured fibers
High power amplifiers
Thermal effects

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title = "Modal instability of rod fiber amplifiers: a semi-analytic approach",

abstract = "The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.",

keywords = "Fiber amplifiers, Modal instability, Microstructured fibers, High power amplifiers, Thermal effects",

author = "J{\o}rgensen, {Mette Marie} and Hansen, {Kristian Rymann} and Marko Laurila and {Tanggaard Alkeskjold}, Thomas and Jesper L{\ae}gsgaard",

year = "2013",

doi = "10.1117/12.2001412",

language = "English",

volume = "8601",

pages = "860123",

journal = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

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note = "SPIE Photonics West LASE 2013 ; Conference date: 02-02-2013 Through 07-02-2013",

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TY - GEN

T1 - Modal instability of rod fiber amplifiers: a semi-analytic approach

AU - Jørgensen, Mette Marie

AU - Hansen, Kristian Rymann

AU - Laurila, Marko

AU - Tanggaard Alkeskjold, Thomas

AU - Lægsgaard, Jesper

PY - 2013

Y1 - 2013

N2 - The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.

AB - The modal instability (MI) threshold is estimated for four rod fiber designs by combining a semi-analytic model with the finite element method. The thermal load due to the quantum defect is calculated and used to numerically determine the mode distributions on which the expression for the onset of MIs is highly dependent. The relative intensity noise of the seed laser in an amplifier setup is used to seed the mode coupling between the fundamental and higher order mode, and lead to MI threshold values of 174 W – 348 W of extracted output power for the four rod fibers having core diameters in the range 53 μm – 95 μm.

KW - Fiber amplifiers

KW - Modal instability

KW - Microstructured fibers

KW - High power amplifiers

KW - Thermal effects

U2 - 10.1117/12.2001412

DO - 10.1117/12.2001412

M3 - Conference article

SN - 1605-7422

VL - 8601

SP - 860123

JO - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

JF - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

T2 - SPIE Photonics West LASE 2013

Y2 - 2 February 2013 through 7 February 2013

ER -

Modal instability of rod fiber amplifiers: a semi-analytic approach

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