ABSTRACT High-index-core (HIC) Bragg fibres have large potential to realize the highly coherent mid-infrared (MIR) supercontinuum generation. The propagation characteristics of HIC Bragg fibre have been analysed using the transfer matrix method and full-vector modal method. We design the HIC Bragg fibre with flat chromatic dispersion and small effective mode diameter in the MIR region and investigate MIR supercontinuum generation. The relationship of fibre length, and pump wavelength on the spectral bandwidth from the fibre was studied. The ultra-flattened dispersion profile was obtained by varying the diameters of the fibre core and cladding thickness. It is numerically demonstrated that the MIR supercontinuum extending from 0.5 to 5.6 µm in the HIC Bragg fibre can be generated by pumping with hyperbolic secant pulse at 1.064 µm, the peak power of 2 kW, and the full width at half maximum of 100 fs.

中文翻译：

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用于超连续谱产生的高度非线性色散平坦高折射率纤芯布拉格光纤

摘要 高折射率纤芯 (HIC) 布拉格光纤具有实现高相干中红外 (MIR) 超连续谱产生的巨大潜力。使用传递矩阵法和全矢量模态法分析了HIC Bragg光纤的传播特性。我们设计了在 MIR 区域具有平坦色散和小有效模式直径的 HIC 布拉格光纤，并研究了 MIR 超连续谱的产生。研究了光纤长度和泵浦波长对光纤光谱带宽的关系。通过改变纤芯直径和包层厚度获得超平坦色散分布。数值证明了在 HIC 布拉格光纤中从 0.5 到 5.6 µm 的 MIR 超连续谱可以通过用 1.064 µm 的双曲线正割脉冲泵浦产生，