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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。
A C-lens-based photonic bandgap fiber collimator is studied. Because the photonic bandgap fiber collimator fiber end face is not reflected, its transmission matrix will change compared with the ordinary fiber collimator. Based on the general model of Gaussian beam single lens imaging, the matrix of light transmission is deduced on meridian and sagittal planes using matrix optics. According to the parameters of photonic band gap fiber and C-lens lens, the influence of distance between tail fiber and C-lens lens and the parameters of C-lens lens on working distance and beam waist diameter were simulated. The theoretical Under the new model, the exit spot of photonic band gap fiber collimator approximately coincides with the beam waist and working distance in meridian plane and sagittal plane, which is smaller than that of normal fiber. The research results are instructive for the design and fabrication of photonic bandgap fiber collimators and optical fiber collimator based optics.