在Yb-doped的低NA PM纤维中,TMI和偏振静态能量转移
Optics express
|July 21, 2023
概括
专用光纤放大器中的横向模式不稳定性 (TMI) 取决于极化. 最低的TMI值发生在缓慢轴上,而快速轴显示出更高的稳定性,但存在能量传输问题.
科学领域:
- * 激光物理和光学工程.
- *光纤技术和高功率激光系统.
背景情况:
- * 大模式区域 (LMA) 纤维放大器对于高功率激光器生成至关重要.
- *保持极化 (PM) 纤维提供稳定的输出极化,对于许多应用至关重要.
- *横向模式不稳定性 (TMI) 限制了光纤放大器中的功率缩放.
研究的目的:
- * 调查横向模式不稳定性 (TMI) 在一个独特的大模式区域,超低的数值光圈偏振维持光纤.
- * 确定输入偏振角度对缓慢轴和快速轴TMI值的影响.
- *在不同的操作条件下分析光束稳定性和极化特性.
主要方法:
- * 实验设置使用大模式区域超低数值光圈偏振维持光纤放大器.
- *输入极化角度相对于光纤主要轴的系统变化 (缓慢和快速).
- *对输出光束稳定性的监测和在不同极化状态下测量TMI值.
主要成果:
- * 当输入偏振平行于慢轴时观察到的最低TMI值 (300 W).
- * 实现了较高的TMI值 (475W),用于快速轴操作,受到功率的限制.
- * 快轴运行显示偏振比降低和意想不到的能量转移到400W以上慢轴运行.
结论:
- *输入极化显著影响这个专用PM光纤放大器中的TMI值.
- * 快速轴操作提供了更高的功率可扩展性,但在极化纯度和能量传输方面存在挑战.
- * 了解偏振依赖的TMI对于优化先进光纤激光系统的功率缩放至关重要.
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