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温度梯度对光纤激光器横向模式的影响

Effects of Temperature Gradient on Transversal Modes in Fiber Lasers

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摘要

分析了温度梯度对光纤激光器横向模式的影响。通过建立简化的光纤截面热传导模型,得到了光纤截面温度的分布。利用场分析软件分析了在不同抽运功率、吸收系数、折射率温度系数下光纤激光器横向模式的变化,发现当抽运功率提高时,横向模式有向纤芯收缩的趋势,这可能是高功率条件下光纤激光器中高阶模式出现的原因之一。当吸收系数增加或折射率温度系数增加时,横向模式也有向纤芯收缩的趋势。

Abstract

The impact of thermal induced temperature gradient on the properties of transversal modes propagating in fiber lasers is carefully investigated. The thermal distribution in the cross section of fiber laser is figured out through a predigested heat conductive model, and then, the properties of transversal modes are analyzed by using multiphysics software under different operating conditions or parameters of fiber. It is found that all the transversal modes have a trend of constriction to the core of fiber with rising power level, and this discovery may give one of the explanations how the high order modes appear in single mode high power fiber lasers. As well, when the absorption coefficient or the refractive index-temperature coefficient is growing, the transversal modes also present a constriction trend.

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中图分类号:TN248

DOI:10.3788/cjl201239.s102010

所属栏目:激光物理

责任编辑:李文喆  信息反馈

收稿日期:2012-01-16

修改稿日期:2012-02-22

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作者单位    点击查看

任亚杰:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
曹涧秋:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
冷进勇:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
郭少锋:国防科学技术大学光电科学与工程学院, 湖南 长沙 410073

联系人作者:任亚杰(nudtrenyj@163.com)

备注:任亚杰(1988—),男,硕士研究生,主要从事高能激光技术方面的研究。

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【5】F. Stutzki, H. Otto, F. Jansen et al.. High-speed modal decomposition of mode instabilities in high-power fiber lasers[J]. Opt. Lett., 2011, 36(23): 4572~4574

【6】K. R. Hansen, T. T. Alkeskjold, J. Broeng et al.. Thermo-optical effects in high-power ytterbium-doped fiber amplifiers[J]. Opt. Express, 2011, 19(24): 23965~23980

【7】S. Hdrich, T. Schreiber, T. Lingert et al.. Thermo-optical behavior of rare-earth-doped low-NA fibers in high power operation[J]. Opt. Express, 2006, 14(13): 6091~6097

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引用该论文

Ren Yajie,Cao Jianqiu,Leng Jinyong,Guo Shaofeng. Effects of Temperature Gradient on Transversal Modes in Fiber Lasers[J]. Chinese Journal of Lasers, 2012, 39(s1): s102010

任亚杰,曹涧秋,冷进勇,郭少锋. 温度梯度对光纤激光器横向模式的影响[J]. 中国激光, 2012, 39(s1): s102010

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