Angular Scattering Pattern of Femtosecond Laser‐Induced Refractive Index Modifications in Optical Fibers,Advanced Optical Materials

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Angular Scattering Pattern of Femtosecond Laser‐Induced Refractive Index Modifications in Optical Fibers
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-26 , DOI: 10.1002/adom.202000633
Aaron Reupert ₁ , Maximilian Heck ₂ , Stefan Nolte _{2,

3} , Lothar Wondraczek ₁

Affiliation

Focused femtosecond laser irradiation is used to induce light scattering modifications in the core of an optical fiber. This turns the fiber into a diffuse, line‐shaped light source. The scattering is investigated by imaging almost the full solid angle far‐field pattern for the first time. Additionally, an electromagnetic scattering model is developed to explain the observations. The findings herein change how the relationship between light scattering and the refractive index fluctuations is perceived by showing that the far‐field scattering pattern is the power spectral density of the polarization current inside the scattering center. Further, the authors contribute to a better estimation of the scattering process by showing that the total scattering power scales quadratically with the laser‐induced refractive index change and its volume.

中文翻译：

飞秒激光在光纤中引起的折射率修改的角散射图

聚焦飞秒激光辐照用于在光纤纤芯中引起光散射改变。这将光纤变成漫射的线形光源。首次通过对几乎整个立体角远场图像成像来研究散射。另外，开发了电磁散射模型来解释观察结果。通过显示远场散射图是散射中心内部极化电流的功率谱密度，本文的发现改变了人们如何感知光散射与折射率波动之间的关系。此外，作者们通过显示总散射功率随激光诱导的折射率变化及其体积呈二次方尺度变化，为更好地估计散射过程做出了贡献。

更新日期：2020-06-26

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