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硫系玻璃具有良好的红外透过性能(可达25μm),极低的声子能量(<350 cm-1),较大的玻璃形成区和极高的非线性折射率n2(为石英材料的100~1 000倍)。硫系玻璃光子晶体光纤因其优良的非线性特性在红外波段具有众多的潜在应用价值。设计一种高非线性特性的无As环保型的Ge20Sb15Se65硫系玻璃光子晶体光纤,利用平面波展开法对结构参数进行优化,获得了具有高非线性和宽带色散平坦的光纤结构参数,研究了其光学参量放大过程。数值模拟发现,通过调整光纤的色散零点,利用3.4μm激光泵浦,可对3.3~3.5μm波段信号光实现有效放大。
Chalcogenide glass has good infrared transmission (up to 25 μm), very low phonon energy (<350 cm -1), large glass formation and extremely high nonlinear refractive index n 2 (for quartz 100 to 1 000 times). Because of its excellent non-linearity, chalcogenide glass photonic crystal fiber has many potential applications in the infrared band. A kind of Ge-free and environment-friendly Ge20Sb15Se65 chalcogenide glass photonic crystal fiber with high non-linearity was designed. The structural parameters were optimized by the plane wave expansion method. The optical fiber structure parameters with high nonlinearity and broadband dispersion flattening were obtained. Parameter amplification process. The numerical simulation shows that by adjusting the chromatic dispersion zero point of optical fiber, the 3.4μm laser pump can effectively amplify the signal light in the band of 3.3 ~ 3.5μm.