【摘要】 本文讨论了大半径空芯圆柱形介质波导中存在的线偏振模EH_1m和LP_nm（n≥1）的场合分布,后者是一对简并模的线性组合.然后,我们计算了自由空间高斯-拉盖尔模TEM_np与这些线偏振模的耦合系数,得到的结果与已发表的实验资料符合得很好.我们还讨论了较小输入孔半径对光泵远红外激光器输出功率的影响.更多还原

【Abstract】 In this paper, the field distributions of the linearly polarized modes EH1m and LPnm(n≥1) are discussed in the large radius hollow dielectric waveguides. The latter is certainly linear combinations of the degenerate waveguide modes. Then the coupling coefficients are between the free-space Gaussian-Laguerre modes and these linearly polarized waveguide modes. The results agree well with published experimental data. We also discussed the influences of input coupling hole with less diameter on output power of the optically pumped FIR laser.更多还原