平面电磁波传播的角谱法，提供了波的传播过程的另一种解释。
The angular spectrum method of plane electromagnetic wave propagation gives another explanation for wave propagation.
用角谱理论来处理衍射光场，不仅速度快，而且在处理近场菲涅耳衍射光场时的准确度是其它方法无法比拟的。
When diffraction problems are solved by the angular spectrum theory, high speed and high accuracy can be obtained, especially for near-field Fresnel diffraction.
晶体厚度和折射率的变化导致衰减全反射(atr)谱的同步角发生移动，进而引起反射率的变化。
The variations of crystal thickness and refractive index will lead to a shift of synchronous Angle of Attenuated Total Reflection (ATR) spectrum, and then bring reflectance variation.
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