Observation of dynamical eigenmodes induced by the moving refractive index grating of TMI in a rod amplifier

Simon L. Christensen; Mattia Michieletto; Mette M. Johansen; Martin D. Maack; Jesper Lægsgaard

doi:10.1364/OL.444158

Observation of dynamical eigenmodes induced by the moving refractive index grating of TMI in a rod amplifier

Simon L. Christensen^*, Mattia Michieletto, Mette M. Johansen, Martin D. Maack, Jesper Lægsgaard

^*Corresponding author for this work

NKT Photonics A/S

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

Abstract

We report a novel, to the best of our knowledge, analysis of high power rod fiber amplifiers by monitoring the cross-polarization of the output. Spatially and temporally resolved imaging of co- and cross-polarizations at high power amplification reveals dynamic eigenmode behavior of the rod fiber. The dynamic of the eigenmodes is caused by the moving refractive index grating written by the modal interference pattern of transverse mode instability and is the first direct observation of this refractive index grating, to our knowledge.

Original language	English
Journal	Optics Letters
Volume	46
Issue number	22
Pages (from-to)	5755-5758
ISSN	0146-9592
DOIs	https://doi.org/10.1364/OL.444158
Publication status	Published - 2021

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title = "Observation of dynamical eigenmodes induced by the moving refractive index grating of TMI in a rod amplifier",

abstract = "We report a novel, to the best of our knowledge, analysis of high power rod fiber amplifiers by monitoring the cross-polarization of the output. Spatially and temporally resolved imaging of co- and cross-polarizations at high power amplification reveals dynamic eigenmode behavior of the rod fiber. The dynamic of the eigenmodes is caused by the moving refractive index grating written by the modal interference pattern of transverse mode instability and is the first direct observation of this refractive index grating, to our knowledge.",

author = "Christensen, {Simon L.} and Mattia Michieletto and Johansen, {Mette M.} and Maack, {Martin D.} and Jesper L{\ae}gsgaard",

year = "2021",

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T1 - Observation of dynamical eigenmodes induced by the moving refractive index grating of TMI in a rod amplifier

AU - Christensen, Simon L.

AU - Michieletto, Mattia

AU - Johansen, Mette M.

AU - Maack, Martin D.

AU - Lægsgaard, Jesper

PY - 2021

Y1 - 2021

N2 - We report a novel, to the best of our knowledge, analysis of high power rod fiber amplifiers by monitoring the cross-polarization of the output. Spatially and temporally resolved imaging of co- and cross-polarizations at high power amplification reveals dynamic eigenmode behavior of the rod fiber. The dynamic of the eigenmodes is caused by the moving refractive index grating written by the modal interference pattern of transverse mode instability and is the first direct observation of this refractive index grating, to our knowledge.

AB - We report a novel, to the best of our knowledge, analysis of high power rod fiber amplifiers by monitoring the cross-polarization of the output. Spatially and temporally resolved imaging of co- and cross-polarizations at high power amplification reveals dynamic eigenmode behavior of the rod fiber. The dynamic of the eigenmodes is caused by the moving refractive index grating written by the modal interference pattern of transverse mode instability and is the first direct observation of this refractive index grating, to our knowledge.

U2 - 10.1364/OL.444158

DO - 10.1364/OL.444158

M3 - Journal article

C2 - 34780454

SN - 0146-9592

VL - 46

SP - 5755

EP - 5758

JO - Optics Letters

JF - Optics Letters

IS - 22

ER -

Observation of dynamical eigenmodes induced by the moving refractive index grating of TMI in a rod amplifier

Abstract

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