Seligson J
Appl Opt. 1987 Jul 1;26(13):2609-11. doi: 10.1364/AO.26.002609.
Two important considerations for designing coupling prisms for optical waveguides are (a) coupling the incident wave to the full range of effective indices for the modes in the waveguide and (b) the ability to observe the optically contacted area, the wet spot, between the prism and waveguide. The latter becomes a problem with high-index prisms owing to total internal reflections. Design parameters for prisms satisfying both of these requirements are derived, and numerical examples are presented for both symmetrical and right-angle rutile prisms.
（a）将入射波耦合到波导中模式的整个有效折射率范围内；（b）能够观察棱镜与波导之间的光学接触区域，即湿斑。由于全内反射，后一个因素对于高折射率棱镜来说成为一个问题。推导了满足这两个要求的棱镜的设计参数，并给出了对称和直角金红石棱镜的数值示例。
