Abstract. We propose the two-stage cascaded-tapered silica photonic crystal fiber (PCF) for the supercontinuum (SC) generation. The cascaded-tapered silica PCF is designed to have a spatial periodic structure. The physical scenarios of the spectral broadening due to the interaction between the structure-induced periodic dispersion and Kerr nonlinearity under different pulse widths and peak powers are investigated. It is found that when the pump pulses with width of <100 fs and peak power of not more than 10 kW are propagated in the cascaded-tapered silica PCF, the SC with good coherence can be generated. It is believed that the research results have potential applications in the nonlinear photonics and spectroscopy.

中文翻译：

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用于超连续谱产生的级联锥形二氧化硅光子晶体光纤

摘要。我们提出了用于超连续谱 (SC) 生成的两级级联锥形二氧化硅光子晶体光纤 (PCF)。级联锥形二氧化硅 PCF 设计为具有空间周期结构。研究了在不同脉冲宽度和峰值功率下由于结构引起的周期性色散和克尔非线性之间的相互作用而导致的光谱展宽的物理场景。发现当泵浦脉冲宽度<100 fs和峰值功率不超过10 kW在级联锥形二氧化硅PCF中传播时，可以产生具有良好相干性的SC。相信该研究成果在非线性光子学和光谱学方面具有潜在的应用价值。