Study of seeding mechanisms of TMI with spatially and temporally resolved imaging

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

doi:10.1117/12.2588432

Study of seeding mechanisms of TMI with spatially and temporally resolved imaging

Simon L. Christensen^* (Invited author), Mette M. Johansen (Invited author), Mattia Michieletto (Invited author), Marco Triches (Invited author), Martin D. Maack (Invited author), Jesper Lægsgaard (Invited author)

^*Corresponding author for this work

NKT Group

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation of the input coupling for a rod-type fiber amplifier using spatially and temporally resolved imaging (ST). We show that inherent pump intensity noise from the power supply can define significant peaks in the resulting TMI spectrum. ST measurements in the transition region of TMI also indicates that the simple picture of TMI being seeded by the combination of a static initial fraction of LP11 and pump or signal intensity noise is not valid for our measurements. Furthermore, we present seeding of TMI by perturbing the input coupling dynamically which allows measurements of the TMI gain as a function of frequency and signal power.

Original language	English
Title of host publication	Proceedings of SPIE
Editors	Michalis N. Zervas, Cesar Jauregui-Misas
Number of pages	9
Volume	11665
Publisher	SPIE - International Society for Optical Engineering
Publication date	2021
Article number	116650Y
ISBN (Electronic)	9781510641655
DOIs	https://doi.org/10.1117/12.2588432
Publication status	Published - 2021
Event	Fiber Lasers XVIII - Virtual, Online, United States Duration: 6 Mar 2021 → 11 Mar 2021

Conference

Conference	Fiber Lasers XVIII
Country/Territory	United States
City	Virtual, Online
Period	06/03/2021 → 11/03/2021

Series	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11665
ISSN	0277-786X

Bibliographical note

Publisher Copyright:
© 2021 SPIE.

Keywords

Beam uctuation measurement
High power
High-speed camera
Large-mode-area fiber
Spatially and temporally resolved imaging
ST measurements
Thermal Rayleigh scattering
Transverse mode instability

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Christensen, S. L., Johansen, M. M., Michieletto, M., Triches, M., Maack, M. D., & Lægsgaard, J. (2021). Study of seeding mechanisms of TMI with spatially and temporally resolved imaging. In M. N. Zervas, & C. Jauregui-Misas (Eds.), Proceedings of SPIE (Vol. 11665). Article 116650Y SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2588432

Christensen, Simon L. ; Johansen, Mette M. ; Michieletto, Mattia et al. / Study of seeding mechanisms of TMI with spatially and temporally resolved imaging. Proceedings of SPIE. editor / Michalis N. Zervas ; Cesar Jauregui-Misas. Vol. 11665 SPIE - International Society for Optical Engineering, 2021. (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 11665).

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title = "Study of seeding mechanisms of TMI with spatially and temporally resolved imaging",

abstract = "In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation of the input coupling for a rod-type fiber amplifier using spatially and temporally resolved imaging (ST). We show that inherent pump intensity noise from the power supply can define significant peaks in the resulting TMI spectrum. ST measurements in the transition region of TMI also indicates that the simple picture of TMI being seeded by the combination of a static initial fraction of LP11 and pump or signal intensity noise is not valid for our measurements. Furthermore, we present seeding of TMI by perturbing the input coupling dynamically which allows measurements of the TMI gain as a function of frequency and signal power.",

keywords = "Beam uctuation measurement, High power, High-speed camera, Large-mode-area fiber, Spatially and temporally resolved imaging, ST measurements, Thermal Rayleigh scattering, Transverse mode instability",

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

note = "Publisher Copyright: {\textcopyright} 2021 SPIE.; Fiber Lasers XVIII ; Conference date: 06-03-2021 Through 11-03-2021",

year = "2021",

doi = "10.1117/12.2588432",

language = "English",

volume = "11665",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE - International Society for Optical Engineering",

editor = "Zervas, \{Michalis N.\} and Cesar Jauregui-Misas",

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Christensen, SL, Johansen, MM, Michieletto, M, Triches, M, Maack, MD & Lægsgaard, J 2021, Study of seeding mechanisms of TMI with spatially and temporally resolved imaging. in MN Zervas & C Jauregui-Misas (eds), Proceedings of SPIE. vol. 11665, 116650Y, SPIE - International Society for Optical Engineering, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11665, Fiber Lasers XVIII, Virtual, Online, United States, 06/03/2021. https://doi.org/10.1117/12.2588432

Study of seeding mechanisms of TMI with spatially and temporally resolved imaging. / Christensen, Simon L. (Invited author); Johansen, Mette M. (Invited author); Michieletto, Mattia (Invited author) et al.
Proceedings of SPIE. ed. / Michalis N. Zervas; Cesar Jauregui-Misas. Vol. 11665 SPIE - International Society for Optical Engineering, 2021. 116650Y (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 11665).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

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AU - Christensen, Simon L.

AU - Johansen, Mette M.

AU - Michieletto, Mattia

AU - Triches, Marco

AU - Maack, Martin D.

AU - Lægsgaard, Jesper

PY - 2021

Y1 - 2021

N2 - In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation of the input coupling for a rod-type fiber amplifier using spatially and temporally resolved imaging (ST). We show that inherent pump intensity noise from the power supply can define significant peaks in the resulting TMI spectrum. ST measurements in the transition region of TMI also indicates that the simple picture of TMI being seeded by the combination of a static initial fraction of LP11 and pump or signal intensity noise is not valid for our measurements. Furthermore, we present seeding of TMI by perturbing the input coupling dynamically which allows measurements of the TMI gain as a function of frequency and signal power.

AB - In this work we investigate transverse mode instability (TMI) in the presence of pump intensity noise and a controlled perturbation of the input coupling for a rod-type fiber amplifier using spatially and temporally resolved imaging (ST). We show that inherent pump intensity noise from the power supply can define significant peaks in the resulting TMI spectrum. ST measurements in the transition region of TMI also indicates that the simple picture of TMI being seeded by the combination of a static initial fraction of LP11 and pump or signal intensity noise is not valid for our measurements. Furthermore, we present seeding of TMI by perturbing the input coupling dynamically which allows measurements of the TMI gain as a function of frequency and signal power.

KW - Beam uctuation measurement

KW - High power

KW - High-speed camera

KW - Large-mode-area fiber

KW - Spatially and temporally resolved imaging

KW - ST measurements

KW - Thermal Rayleigh scattering

KW - Transverse mode instability

U2 - 10.1117/12.2588432

DO - 10.1117/12.2588432

M3 - Article in proceedings

AN - SCOPUS:85107032644

VL - 11665

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Proceedings of SPIE

A2 - Zervas, Michalis N.

A2 - Jauregui-Misas, Cesar

PB - SPIE - International Society for Optical Engineering

T2 - Fiber Lasers XVIII

Y2 - 6 March 2021 through 11 March 2021

ER -

Christensen SL, Johansen MM, Michieletto M, Triches M, Maack MD, Lægsgaard J. Study of seeding mechanisms of TMI with spatially and temporally resolved imaging. In Zervas MN, Jauregui-Misas C, editors, Proceedings of SPIE. Vol. 11665. SPIE - International Society for Optical Engineering. 2021. 116650Y. (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 11665). doi: 10.1117/12.2588432

Study of seeding mechanisms of TMI with spatially and temporally resolved imaging

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