高功率全光纤结构主振荡功率放大器中模式不稳定现象的实验研究

陶汝茂; 周朴; 王小林; 司磊; 刘泽金

doi:10.7498/aps.63.085202

摘要

模式不稳定指高功率光纤激光随着输出功率提升发生的模式突变，会导致光束质量下降，限制了衍射极限光束质量光纤激光输出功率的提升. 本文研究了全光纤结构主振荡功率放大器中的模式不稳定现象. 结果表明，全光纤结构主振荡功率放大器中的模式不稳定现象会导致放大器斜率效率下降；理论计算表明，对于20/400阶跃折射率大模场双包层掺镱光纤，注入种子功率在百瓦左右时，模式不稳定发生的阈值功率在1 kW 左右；热效应是模式不稳定现象发生的根源.

关键词:

Abstract

Mode instability (MI) is an abrupt mode change when the average output power increases above a certain threshold power, which results in degrading beam quality and restricting the enhancement of power output for diffraction-limited high power fiber laser. The experimental study on MI in all-fiberized master oscillator power amplifer (MOPA) is presented in detail for the first time. It is revealed that MI in all-fiberized MOPA results in reducing the slope efficiency. The theoretical threshold power of MI for 20/400 step-index large-mode-area double-cladding Yb-doped fiber is about 1 kW and MI is rooted mainly from the thermal effect.

Keywords:

作者及机构信息

1.
国防科学技术大学光电科学与工程学院, 长沙 410073

基金项目: 国家自然科学基金（批准号：11274386）、国防科技大学优秀研究生创新项目（批准号：B120704）和湖南省研究生科研创新项目（批准号：CX2012B035）资助的课题.

Authors and contacts

1.
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11274386), the Innovation Foundation for Excellent Graduates in National University of Defense Technology, China (Grant No. B120704), and the Hunan Provincial Innovation Foundation for Postgraduate, China (Grant No. CX2012B035).

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施引文献

[1]	Richardson D J, Nilsson J, Clarkson W A 2010 J. Opt. Soc. Am. B 27 B63
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[3]	Zhu J J, Du W B, Zhou P, et al. 2012 Acta Phys. Sin. 61 064209 (in Chinese) [朱家健, 杜文博, 周朴等 2012 61 064209]
[4]
[5]	Yang W Q, Hou J, Song R, et al. 2011 Acta Phys. Sin. 60 84210 (in Chinese) [杨未强, 侯静, 宋锐等 2011 60 84210]
[6]	Xiao H, Wu W M, Xu J M, et al. 2011 Chin. Phys. B 20 114208
[7]
[8]	Jauregui C, Eidam T, Otto H J, et al. 2012 Opt. Express 20 12912
[9]
[10]	Eidam T, Wirth C, Jauregui C, et al. 2011 Opt. Express 19 13218
[11]
[12]	Engin D, Lu W, Verdun H, Gupta S 2013 Proc. of SPIE 8733 87330J
[13]
[14]
[15]	Eidam T, Hanf S, Seise E, et al. 2010 Opt. Lett. 35 94
[16]
[17]	Stutzki F, Otto H J, Jansen F, et al. 2011 Opt. Lett. 36 4572
[18]
[19]	Otto H-J, Jauregui C, Stutzki F 2013 Opt. Express 21 17285
[20]	Laurila M, Jorgensen M M, Hansen K R, et al. 2012 Opt. Express 20 5742
[21]
[22]
[23]	Jansen F, Stutzki F, Otto H J, et al. 2012 Opt. Express 20 3997
[24]
[25]	Ward B, Robin C, Dajani I, et al. 2012 Opt. Express 20 11407
[26]
[27]	Otto H-J, Stutzki F, Jansen F, et al. 2012 Opt. Express 20 15710
[28]	Haarlammert N, Vries O, Liem A, et al. 2012 Opt. Express 20 13274
[29]
[30]	Jauregui C, Eidam T, Limpert J, et al. 2011 Opt. Express 19 3258
[31]
[32]	Smith A V, Smith J J 2011 Opt. Express 19 10180
[33]
[34]	Smith A V, Smith J J 2013 Opt. Express 21 2606
[35]
[36]
[37]	Smith A V, Smith J J 2012 Opt. Express 20 24545
[38]	Hansen K R, Alkeskjold T T, Broeng J, et al. 2012 Opt. Lett. 37 2382
[39]
[40]
[41]	Hansen K R, Alkeskjold T T, Broeng J, et al. 2013 Opt. Express 21 1944
[42]
[43]	Dong L 2013 Opt. Express 21 2642
[44]	Hu I N, Zhu C, Zhang C, et al. 2013 Proc. SPIE 8601 860109
[45]
[46]	Jauregui C, Ottoa H J, Jansena F, et al. 2013 Proc. SPIE 8601 86010F
[47]
[48]	Jauregui C, Otto H J, Stutzki F, et al. 2013 Opt. Express 21 19375
[49]
[50]	Ward B 2013 Opt. Express 21 12053
[51]
[52]
[53]	Naderi S, Dajani I, Madden T, et al. 2013 Opt. Express 21 16111
[54]	Wirth C, Schreiber T, Rekas M, et al. 2010 Proc. SPIE 7580 75801H-6
[55]
[56]
[57]	Schmidt O, Rekas M, Wirth C, et al. 2011 Opt. Express 19 4421
[58]	Eidam T, Hdrich S, Jansen F, et al. 2011 Opt. Express 19 8656
[59]
[60]
[61]	Stutzki F, Jansen F, Eidamet T, et al. 2011 Opt. Lett. 36 689
[62]	Jrgensen M M, Laurila M, Noordegraaf D, et al. 2013 Proc. SPIE 8601 86010U
[63]
[64]	Wirth C, Schmidt O, Tsybin I, et al. 2011 Opt. Lett. 36 3118
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[67]	Jocher C, Eidama T, Hdricha S, et al. 2013 Proc. SPIE 8601 86011F
[68]	Karow M, Tnnermann H, Neumann J, et al. 2012 Opt. Lett. 37 4242
[69]

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