一阶振荡导模的传播常数随着平板厚度的减小而增加，此性质与传统的金属包覆波导不同。
The propagation constant increases with decreasing slab thickness for the first-order oscillating mode, which is different from that in traditional metal-cladding waveguides.
本文介绍了一种用激光细光束测量平行平面板折射率的新方法，并分析计算了入射角、平板厚度及光束位移量的误差对折射率测量精度的影响。
A new measurement method of refractive index of plane-parallel plate has been introduced in this paper, which is performed by thin laser beam.
玻璃切割工人按照指定的大小和形状切割各种厚度的平板玻璃。
Glass cutters cut flat glass of various thicknesses to specified sizes and shapes by hand.
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