Mitigating mode instabilities by controllable mode beating excitation with a photonic lantern

被引：0

作者：

Lu, Yao ^{[1
]}

Jiang, Zongfu ^{[1
,2
,3
]}

Xiao, Hu ^{[1
,2
,3
]}

Chen, Zilun ^{[1
,2
,3
]}

Jiang, Man ^{[1
,2
,3
]}

Chai, Junyu ^{[1
]}

Yang, Hao ^{[1
]}

Ding, Lianchuang ^{[1
]}

Zhang, Dan ^{[1
,2
,3
]}

Zhang, Jiangbin ^{[1
,2
,3
]}

Zhou, Qiong ^{[1
,2
,3
]}

Liu, Wenguang ^{[1
,2
,3
]}

机构：

[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha, Peoples R China

[2] Natl Univ Def Technol, Nanhu Laser Lab, Changsha, Peoples R China

[3] Natl Univ Def Technol, Hunan Prov Key Lab High Energy Laser Technol, Changsha, Peoples R China

来源：

FRONTIERS IN PHYSICS | 2023年 / 11卷

基金：

中国国家自然科学基金;

关键词：

mode instability; photonic lantern; adaptive control; mode beatings; fiber laser; HIGH-POWER; SINGLE-FREQUENCY; FIBER AMPLIFIER; LASER; MODULATION;

D O I：

10.3389/fphy.2023.1198092

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this study, a method of stabilizing the output beam of a large-mode-area fiber amplifier operating above the mode instability threshold is demonstrated. A mode control system based on the photonic lantern is used to excite dynamic mode beatings as the seeding stage of a 42/250 mu m Yb-doped fiber amplifier. We propose a theoretical explanation for the validity of this method: provided that the mode interference patterns generated by input mode beatings are antisymmetric to those in the main amplifier caused by thermally induced non-linear effects, the refractive index grating will not be formed to indicate the onset of mode instability. Experimentally, significant mode stability and beam quality improvement have been achieved in this system at power levels of up to nearly four times the mode instabilities threshold.

引用

页数：7

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