...2λ，两束光合轴后干涉加强，振幅增大或者减少，提高反差。在结构上，相差显微镜又不同于普通光学显微镜，具有两个特殊之处： 环形光阑（annular diaphragm）位于光源与聚光器之间，作用是透过聚光器的光线形成空心光锥，集聚到标本上。
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研究了多色空间完全相干光经过环形光阑衍射后在远场出现的光谱变化，并给出了详细的数值计算结果和具体实例。
The spectral behavior of polychromatic spatially fully coherent light diffracted by an annular aperture in the far field is studied.
研究了多色空间完全相干光经过环形光阑衍射后在远场出现的光谱变化，并给出了详细的数值计算结果和具体实例。
The singularity changes and spectral behavior of polychromatic spatially fully coherent light diffracted by an annular aperture in the near field were studied.
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