In this paper, we design a silicon-core photonic crystal fiber (PCF) composed of MgF₂ background material to generate supercontinuum spectra in the near- and mid-infrared wavelength ranges. The linear properties of the PCF, including effective index, group velocity dispersion, loss, and effective area, as well as the nonlinear parameter, are calculated for several core radii. We show that by choosing the PCF's optimal geometric dimensions using the particle swarm optimization algorithm, high flatness and near-zero dispersion profile at the desired wavelength can be achieved. Numerical results reveal that by pumping 50 femtosecond optical pulses with a peak power of 1 kW centered at the wavelength of 2460 nm into the proposed optimized PCF, a spectrum with a spectral bandwidth of 2670 nm in the near- and mid-infrared wavelength ranges at 10-mm long PCF can be generated. Such a broad spectrum has many applications, especially in the production of highly sensitive optical sensors applicable in the medical, security, and petrochemical industries.

在本文中，我们设计了一种由 MgF ₂组成的硅芯光子晶体光纤 (PCF)背景材料在近红外和中红外波长范围内产生超连续谱。PCF 的线性特性，包括有效指数、群速度色散、损耗和有效面积，以及非线性参数，都是针对几个核心半径计算的。我们表明，通过使用粒子群优化算法选择 PCF 的最佳几何尺寸，可以实现所需波长的高平坦度和近零色散分布。数值结果表明，通过将 50 个峰值功率为 1 kW、以 2460 nm 波长为中心的飞秒光脉冲泵浦到所提出的优化 PCF 中，在近红外和中红外波长范围内的光谱带宽为 2670 nm。可以生成 10 毫米长的 PCF。如此广泛的应用范围，