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本文通过对耦合棱镜中反射光束强度变化的测量，给出了平板波导的全部折射率参数，包括波导表面、波导模以及衬底的折射率，由此可以精确的得到平板波导的折射率分布，为波导的设计提供了可靠的参数．
In this paper, the total refractive index parameters of the slab waveguide, including the waveguide surface, the waveguide mode and the refractive index of the substrate, are given by measuring the change of the intensity of the reflected beam in the coupling prism, so that the refractive index distribution of the slab waveguide can be accurately obtained, The waveguide design provides a reliable parameter.