Mode Instability in the Ytterbium Doped Fiber Amplifier

Document Type : Original Article

Authors

1 Department of Physics, Azarbaijan Shahid Madani University, West Azarbaijan, Tabriz, Iran

2 Faculty of Plasma Research School, Nuclear Science and Technology Research Institute, Tehran, Iran, P.O. Box 14155-1339

3 Department of Physics, Urmia University, 11km SERO Road, Urmia, Iran

Abstract

Different factors such as nonlinear phenomena and mode instability affect the output of the high-power fiber lasers and amplifiers. Since these devices have many applications in the industry, medicine, and military facilities, the study of the various factors’ effects on their output is directly reflected on the design of high-power lasers and amplifiers. In the present paper, the mode instability which is the major limiting factor on the output of high power lasers and amplifiers has been studied, simulated, and investigated. In these high-power devices, the temperature increases due to quantum defects, background loss, and light scattering, which change the refractive index of the fiber material. Variation of the refractive index is the main reason of mode instability in high power fiber lasers and amplifiers. Mode instability causes the coupling of the fundamental mode  to the upper-mode and thus decreases the fundamental mode’s energy. In this paper, different factors that affect the threshold of the mode instability and power transfer from the fundamental mode to the upper mode have been investigated.

Keywords

References

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Applied Electromagnetics
Volume 8, Issue 2 - Serial Number 21
December 2021
Pages 33-43

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History

  • Receive Date: 28 January 2020
  • Revise Date: 10 May 2020
  • Accept Date: 12 June 2020
  • Publish Date: 21 November 2020

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