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通过极化维护纤维的模态双折射减轻横向模式不稳定性

Gonzalo Palma-Vega, César Jáuregui, Denny Hässner

|December 13, 2023

概括

在高功率光纤激光器中,横向模式不稳定性 (TMI) 通过在偏振维护 (PM) 纤维中使用模态双折射来减轻. 调整输入极化角度显著提高了TMI值,证实了理论预测.

科学领域:

光学和光子学在光学和光子学.
激光物理激光物理
材料科学材料科学材料科学

背景情况:

横向模式不稳定性 (TMI) 限制了光纤激光系统的功率扩展.
缓解TMI对于推进高功率激光应用至关重要.

研究的目的:

在保持偏振 (PM) 纤维中使用模态双折射来研究TMI的缓解.
从理论和实验上验证输入偏振角度对TMI值的影响.

主要方法:

通过模拟模拟模拟TMI缓解通过模拟模拟的综合模拟.
设计和制造一个Yb-doped的大模式区域的PM纤维.
对TMI值依赖于种子激光极化输入角度的实验研究.

主要成果:

模拟表明,调整输入偏振角度会改变并抑制导致TMI的热感应折射率格子.
实验结果表明,当种子极化与纤维的缓慢轴对齐50°时,TMI值增加了两倍.
高速极化模式解析分析显示,在TMI开始时,两极化轴的同时波动.

结论:

粒子纤维中的模态双折射为高功率光纤激光器中TMI缓解提供了有效的策略.
这些发现验证了理论模型,并展示了提高激光系统性能的实际方法.
了解极化动态是先进激光系统中管理TMI的关键.

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