基于C-lens的光子带隙光纤准直器传输特性

研究了一种基于C-lens的光子带隙光纤准直器,由于光子带隙光纤准直器光纤端面没有反射,相比普通光纤准直器,其传输矩阵将发生变化。从高斯光束单透镜成像的一般模型出发,利用矩阵光学,在子午面和弧矢面推导了光线传输矩阵。结合实际应用中光子带隙光纤及C-lens透镜的参数,仿真分析了尾纤与C-lens透镜之间的间距及C-lens透镜的参数对工作距离和束腰直径大小的影响,理论得到了新模型下,光子带隙光纤准直器的出射光斑在子午面和弧矢面束腰直径和工作距离近似重合,相比普通光纤出射光斑的椭圆化程度小。研究结果对进行光子带隙光纤准直器及基于光纤准直器的光学器件设计与制作具有指导意义。

Propagation characteristics of photonic bandgap fiber collimator with C-lens

A photonic bandgap fiber collimator with C-lens was proposed.The photonic crystal fiber end face does not have reflection,so the transform matrix will change.From the general model of Gaussian-beam imaging,using the theory of matrix optics,the matrix optics was calculated in meridian plane and sagittal plane respectively.Combined with practical applications in photonic bandgap fiber and C-lens related parameters,the influence of the distance between fiber tail and C-lens and the influence of the parameter of the C-lens on working distance and beam waist diameter of collimator were both stimulated and analyzed.The results of the analysis in new model show that the influence of the C-lens tile for meridian plane and sagittal plane was similar,and the Gaussian-beam ellipse was smaller compared with ordinary fiber.The result may direct the design of photonic bandgap fiber collimator and the design of optical device with photonic bandgap fiber collimator.