Power of all-fiber amplifier increasing from 1030 W to 2280 W through suppressing mode instability by increasing the seed power

doi:10.1088/1674-1056/28/2/024208

Abstract

In this work, we investigate suppressing mode instability in detail by varying the seed power in a large mode area all-fiber amplifier with a fiber core diameter of 25 μm. The transverse mode instability (TMI) thresholds are systematically measured for different seed power. Our experimental results reveal that increasing the seed power has a positive influence on enhancing the output power before the TMI effect appears, and finally the TMI threshold is approximately doubled from 1030 W to 2280 W when the seed power is increased from 27 W to 875 W. Almost 84.7% slope efficiency is reached with different seed power before the TMI threshold power. During our operation, we also find that in this type of LMA fiber the beam quality of the amplifier is degraded gradually instead of a sudden change as the pump power increases.

Keywords: mode instabilities seed power coupling efficient beam quality degradation

Received: 10 September 2018
Revised: 25 October 2018
Accepted manuscript online:

PACS:	42.55.Wd	(Fiber lasers)
	42.55.Xi	(Diode-pumped lasers)
	42.65.Es	(Stimulated Brillouin and Rayleigh scattering)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61735007 and 61505260).

Corresponding Authors: Ru-Mao Tao, Xiao-Lin Wang
E-mail: taorumao@sohu.com;chinawxllin@163.com

Cite this article:

Xue-Xue Luo(罗雪雪), Ru-Mao Tao(陶汝茂), Chen Shi(史尘), Han-Wei Zhang(张汉伟), Xiao-Lin Wang(王小林), Pu Zhou(周朴), Xiao-Jun Xu(许晓军) Power of all-fiber amplifier increasing from 1030 W to 2280 W through suppressing mode instability by increasing the seed power 2019 Chin. Phys. B 28 024208

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Power of all-fiber amplifier increasing from 1030 W to 2280 W through suppressing mode instability by increasing the seed power

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