Wu Dakun, Yu Fei, Liao Meisong
Opt Express. 2020 Apr 13;28(8):11840-11851. doi: 10.1364/OE.380847.
In this paper, the material loss of anti-resonant hollow-core fiber (AR-HCF) and its properties are studied. We revisit the formula of power attenuation coefficient for the index-guiding optical fiber described by Snyder and Love in the 1980s and derive the modal overlap factor that governs the material loss of hollow-core fibers (HCF). The modal overlap factor formula predicts the material loss of AR-HCF, which agrees with numerical simulations by the finite element method. The optimization of silica-based AR-HCF design for the lowest loss at 4 µm wavelength is numerically discussed where the silica absorption reaches over 800 dB/m. Our work would provide practical guidance to develop low-loss AR-HCF at highly absorptive wavelengths, e.g. in the vacuum UV and mid/far-infrared spectral regions.
本文研究了反谐振空芯光纤（AR-HCF）的材料损耗及其特性。我们重新审视了20世纪80年代由斯奈德和洛夫描述的折射率引导型光纤的功率衰减系数公式，并推导了控制空芯光纤（HCF）材料损耗的模式重叠因子。该模式重叠因子公式预测了AR-HCF的材料损耗，与有限元法的数值模拟结果相符。在数值上讨论了基于二氧化硅的AR-HCF在4 µm波长处实现最低损耗的设计优化，此时二氧化硅的吸收超过800 dB/m。我们的工作将为在高吸收波长（例如真空紫外和中/远红外光谱区域）开发低损耗AR-HCF提供实际指导。
