Paxton K B, Streifer W
Appl Opt. 1971 May 1;10(5):1164-71. doi: 10.1364/AO.10.001164.
Analytic solutions are found for skew ray paths in inhomogeneous cylindrical systems such as GRIN rods and gas lenses, which focus rays by virtue of a gradual radial decrease in refractive index. The solutions are obtained by employing digital computers to carry out analytic, as opposed to numerical, calculations.
对于非均匀圆柱系统（如渐变折射率棒和气体透镜）中的斜射线路径，找到了解析解，这些系统通过折射率沿径向逐渐降低来聚焦光线。这些解是通过使用数字计算机进行解析计算（而非数值计算）得到的。
