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Advanced attenuation and fluorescence measurement methods in the investigation of photodarkening and related properties of ytterbium-doped fibers

机译:掺attenuation光纤光暗化及相关特性研究中的先进衰减和荧光测量方法

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摘要

Considering the continuous development of ytterbium (Yb)-doped fibers for fiber lasers and amplifiers, thorough characterization of the features and quality of such fibers is necessary now more than ever. In particular, the evaluation of the very strong core attenuation that results from Yb absorption and the losses accompanying photodarkening (PD) processes in Yb-doped optical fibers is still of immense interest. Keeping that in mind, the potential of a method using pinhole fibers will be demonstrated here. Moreover, the investigation of fluorescence properties of Yb~(3+) is also important; it can be affected by phenomena such as reabsorption, inhomogeneous pump intensity distribution, amplified spontaneous emission, lasing, and, lastly, PD. As these phenomena occur while measuring the fluorescence properties of Yb~(3+) in optical fibers, they can distort the fluorescence spectra and fluorescence decay significantly. We suggest a twice-perpendicular measurement method and strict time management to avoid these interfering phenomena during the fluorescence measurements.
机译:考虑到用于光纤激光器和放大器的掺(光纤的不断发展,现在比以往任何时候都更需要对这种光纤的特性和质量进行全面的表征。尤其是,对由掺Yb的光纤中的Yb吸收和伴随光暗化(PD)过程引起的损耗而导致的非常强的芯衰减的评估仍然非常重要。牢记这一点,这里将展示使用针孔纤维的方法的潜力。此外,研究Yb〜(3+)的荧光性质也很重要。它可能会受到以下现象的影响,例如重吸收,不均匀的泵浦强度分布,放大的自发发射,激射,最后还有PD。当这些现象在测量光纤中Yb〜(3+)的荧光特性时发生时,它们会扭曲荧光光谱并显着衰减荧光。我们建议使用两次垂直测量方法和严格的时间管理,以避免在荧光测量过程中出现这些干扰现象。

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