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arXiv 2201.02139physics.optics
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高热负载下掺铥光纤放大器的横模不稳定性和热效应

Transverse mode instability and thermal effects in thulium-doped fiber amplifiers under high thermal loads

Christian Gaida, Martin Gebhardt, Tobias Heuermann, Ziyao Wang, Cesar Jauregui, Jens Limpert

摘要:

我们实验分析了超快,掺铥光纤放大器的平均功率缩放能力。理论上预测,在观察到横模不稳定性(TMI)开始之前,发射波长在2 μ m左右的掺铥光纤激光器系统应该能够承受比掺Yb光纤激光器高得多的热负荷。在这项工作中,我们通过在非常高的热负荷下操作掺铥光纤来实验验证这一理论预测。在单独的实验中,我们分析了两种不同的大芯,掺铥光纤放大器的性能。第一个实验的目的是在超过300 W/m的极端热负载水平下操作短的、非常大的芯的掺铥光纤放大器。即使在这种极端的热负荷水平下,也没有观察到TMI的发生。第二个实验最大限度地提高了可提取的平均输出功率从一个大的核心,铥掺杂,光纤放大器。我们已经实现了1.15千瓦的泵限制的平均输出功率没有TMI的发病。然而,在此功率水平下较长时间的操作期间,放大器性能稳定地下降,并且此后对于超过847 W的平均功率可以观察到TMI。这是第一次,据我们所知,TMI已被报道在掺铥光纤放大器。

英文摘要:

We experimentally analyze the average-power-scaling capabilities of ultrafast, thulium-doped fiber amplifiers. It has been theoretically predicted that thulium-doped fiber laser systems, with an emission wavelength around 2 um, should be able to withstand much higher heat-loads than their Yb-doped counterparts before the onset of transverse mode instability (TMI) is observed. In this work we experimentally verify this theoretical prediction by operating thulium doped fibers at very high heat-load. In separate experiments we analyze the performance of two different large-core, thulium-doped fiber amplifiers. The first experiment aims at operating a short, very-large core, thulium-doped fiber amplifier at extreme heat-load levels of more than 300 W/m. Even at this extreme heat-load level, the onset of TMI is not observed. The second experiment maximizes the extractable average-output power from a large-core, thulium-doped, fiber amplifier. We have achieved a pump-limited average output power of 1.15 kW without the onset of TMI. However, during a longer period of operation at this power level the amplifier performance steadily degraded and TMI could be observed for average powers in excess of 847 W thereafter. This is the first time, to the best of our knowledge, that TMI has been reported in a thulium-doped fiber amplifier.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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