Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers

Yoshito Shuto

doi:doi:10.11648/j.jeee.20221002.14

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Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers

Yoshito Shuto

Published in Journal of Electrical and Electronic Engineering (Volume 10, Issue 2)

Received: 13 March 2022 Accepted: 29 March 2022 Published: 9 April 2022

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Abstract

Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using large-mode-area double-clad fibers (DCFs) is utilized to increase the overall conversion efficiency of pumping light and to overcome the restriction owing to the onset of stimulated Raman scattering. On the other hand, it is extremely challenging to increase the fiber core size while retaining the excellent beam quality because fibers with large core size allow propagation of several higher-order modes (HOMs), except for the fundamental mode (FM). In order to suppress HOMs, DCFs are bent with a relatively small bend radius. Failures at bends in an optical fiber are caused by light leaking from the core when the fiber is accidentally bent tightly with a high power input. For the DCFs with core radii of 10 and 20 mm, the relationship between the bending induced temperature increases and the bend losses in the bent DCFs was investigated theoretically by the explicit finite-difference method using the thermochemical SiO_x production model. The temperature at the boundary between the inner and outer cladding layers increased with increasing optical power P at 1.080 mm and was a large value higher than the softening temperature T_s of the silica glass when P = 5 kW was entered to the bent DCF with a bend radius R of 150 mm and a core radius of 10 mm. On the other hand, the temperature at the boundary was a small value lower than the T_s when P = 10 kW was entered to the bent DCF with a large R of 245-275 mm. Furthermore, it was found that the initiation of the fiber fuse was fairly easy under a certain conditions where the temperature at the boundary was higher than the T_s.

Published in	Journal of Electrical and Electronic Engineering (Volume 10, Issue 2)
DOI	10.11648/j.jeee.20221002.14
Page(s)	64-70
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

Fiber Laser, Bending Loss, Fiber Fuse Phenomenon, Double-Clad Fiber, Finite-Difference Technique

References

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Yoshito Shuto. (2022). Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. Journal of Electrical and Electronic Engineering, 10(2), 64-70. https://doi.org/10.11648/j.jeee.20221002.14

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Yoshito Shuto. Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. J. Electr. Electron. Eng. 2022, 10(2), 64-70. doi: 10.11648/j.jeee.20221002.14

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AMA Style

Yoshito Shuto. Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. J Electr Electron Eng. 2022;10(2):64-70. doi: 10.11648/j.jeee.20221002.14

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@article{10.11648/j.jeee.20221002.14,
  author = {Yoshito Shuto},
  title = {Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {10},
  number = {2},
  pages = {64-70},
  doi = {10.11648/j.jeee.20221002.14},
  url = {https://doi.org/10.11648/j.jeee.20221002.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20221002.14},
  abstract = {Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using large-mode-area double-clad fibers (DCFs) is utilized to increase the overall conversion efficiency of pumping light and to overcome the restriction owing to the onset of stimulated Raman scattering. On the other hand, it is extremely challenging to increase the fiber core size while retaining the excellent beam quality because fibers with large core size allow propagation of several higher-order modes (HOMs), except for the fundamental mode (FM). In order to suppress HOMs, DCFs are bent with a relatively small bend radius. Failures at bends in an optical fiber are caused by light leaking from the core when the fiber is accidentally bent tightly with a high power input. For the DCFs with core radii of 10 and 20 mm, the relationship between the bending induced temperature increases and the bend losses in the bent DCFs was investigated theoretically by the explicit finite-difference method using the thermochemical SiOx production model. The temperature at the boundary between the inner and outer cladding layers increased with increasing optical power P at 1.080 mm and was a large value higher than the softening temperature Ts of the silica glass when P = 5 kW was entered to the bent DCF with a bend radius R of 150 mm and a core radius of 10 mm. On the other hand, the temperature at the boundary was a small value lower than the Ts when P = 10 kW was entered to the bent DCF with a large R of 245-275 mm. Furthermore, it was found that the initiation of the fiber fuse was fairly easy under a certain conditions where the temperature at the boundary was higher than the Ts.},
 year = {2022}
}

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TY  - JOUR
T1  - Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers
AU  - Yoshito Shuto
Y1  - 2022/04/09
PY  - 2022
N1  - https://doi.org/10.11648/j.jeee.20221002.14
DO  - 10.11648/j.jeee.20221002.14
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 64
EP  - 70
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20221002.14
AB  - Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using large-mode-area double-clad fibers (DCFs) is utilized to increase the overall conversion efficiency of pumping light and to overcome the restriction owing to the onset of stimulated Raman scattering. On the other hand, it is extremely challenging to increase the fiber core size while retaining the excellent beam quality because fibers with large core size allow propagation of several higher-order modes (HOMs), except for the fundamental mode (FM). In order to suppress HOMs, DCFs are bent with a relatively small bend radius. Failures at bends in an optical fiber are caused by light leaking from the core when the fiber is accidentally bent tightly with a high power input. For the DCFs with core radii of 10 and 20 mm, the relationship between the bending induced temperature increases and the bend losses in the bent DCFs was investigated theoretically by the explicit finite-difference method using the thermochemical SiOx production model. The temperature at the boundary between the inner and outer cladding layers increased with increasing optical power P at 1.080 mm and was a large value higher than the softening temperature Ts of the silica glass when P = 5 kW was entered to the bent DCF with a bend radius R of 150 mm and a core radius of 10 mm. On the other hand, the temperature at the boundary was a small value lower than the Ts when P = 10 kW was entered to the bent DCF with a large R of 245-275 mm. Furthermore, it was found that the initiation of the fiber fuse was fairly easy under a certain conditions where the temperature at the boundary was higher than the Ts.
VL  - 10
IS  - 2
ER  -

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Yoshito Shuto

Ofra Project, Iruma City, Japan

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Yoshito Shuto. (2022). Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. Journal of Electrical and Electronic Engineering, 10(2), 64-70. https://doi.org/10.11648/j.jeee.20221002.14

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ACS Style

Yoshito Shuto. Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. J. Electr. Electron. Eng. 2022, 10(2), 64-70. doi: 10.11648/j.jeee.20221002.14

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AMA Style

Yoshito Shuto. Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers. J Electr Electron Eng. 2022;10(2):64-70. doi: 10.11648/j.jeee.20221002.14

Copy | Download

@article{10.11648/j.jeee.20221002.14,
  author = {Yoshito Shuto},
  title = {Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {10},
  number = {2},
  pages = {64-70},
  doi = {10.11648/j.jeee.20221002.14},
  url = {https://doi.org/10.11648/j.jeee.20221002.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20221002.14},
  abstract = {Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using large-mode-area double-clad fibers (DCFs) is utilized to increase the overall conversion efficiency of pumping light and to overcome the restriction owing to the onset of stimulated Raman scattering. On the other hand, it is extremely challenging to increase the fiber core size while retaining the excellent beam quality because fibers with large core size allow propagation of several higher-order modes (HOMs), except for the fundamental mode (FM). In order to suppress HOMs, DCFs are bent with a relatively small bend radius. Failures at bends in an optical fiber are caused by light leaking from the core when the fiber is accidentally bent tightly with a high power input. For the DCFs with core radii of 10 and 20 mm, the relationship between the bending induced temperature increases and the bend losses in the bent DCFs was investigated theoretically by the explicit finite-difference method using the thermochemical SiOx production model. The temperature at the boundary between the inner and outer cladding layers increased with increasing optical power P at 1.080 mm and was a large value higher than the softening temperature Ts of the silica glass when P = 5 kW was entered to the bent DCF with a bend radius R of 150 mm and a core radius of 10 mm. On the other hand, the temperature at the boundary was a small value lower than the Ts when P = 10 kW was entered to the bent DCF with a large R of 245-275 mm. Furthermore, it was found that the initiation of the fiber fuse was fairly easy under a certain conditions where the temperature at the boundary was higher than the Ts.},
 year = {2022}
}

Copy | Download

TY  - JOUR
T1  - Bending Induced Temperature Increases in Double-Clad Fibers for High-Power Fiber Lasers
AU  - Yoshito Shuto
Y1  - 2022/04/09
PY  - 2022
N1  - https://doi.org/10.11648/j.jeee.20221002.14
DO  - 10.11648/j.jeee.20221002.14
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 64
EP  - 70
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20221002.14
AB  - Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using large-mode-area double-clad fibers (DCFs) is utilized to increase the overall conversion efficiency of pumping light and to overcome the restriction owing to the onset of stimulated Raman scattering. On the other hand, it is extremely challenging to increase the fiber core size while retaining the excellent beam quality because fibers with large core size allow propagation of several higher-order modes (HOMs), except for the fundamental mode (FM). In order to suppress HOMs, DCFs are bent with a relatively small bend radius. Failures at bends in an optical fiber are caused by light leaking from the core when the fiber is accidentally bent tightly with a high power input. For the DCFs with core radii of 10 and 20 mm, the relationship between the bending induced temperature increases and the bend losses in the bent DCFs was investigated theoretically by the explicit finite-difference method using the thermochemical SiOx production model. The temperature at the boundary between the inner and outer cladding layers increased with increasing optical power P at 1.080 mm and was a large value higher than the softening temperature Ts of the silica glass when P = 5 kW was entered to the bent DCF with a bend radius R of 150 mm and a core radius of 10 mm. On the other hand, the temperature at the boundary was a small value lower than the Ts when P = 10 kW was entered to the bent DCF with a large R of 245-275 mm. Furthermore, it was found that the initiation of the fiber fuse was fairly easy under a certain conditions where the temperature at the boundary was higher than the Ts.
VL  - 10
IS  - 2
ER  -

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