However, for the actual optical system, its point image become a speckle because of diffraction of light and aberration.

对于实际光学系统，由于光的衍射和像差，使所成的点像为一弥散斑。

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The invariable loss comes from the materials and surface processing of the system itself, such as the loss of Fresnel, ball aberration, diffraction, chromatic aberration and absorb.

固定损耗是由系统自身所用材料、表面处理决定的，包括菲涅耳损耗、球差损耗、衍射损耗、色散损耗、吸收损耗等。

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Abstract : As one of the important technical specifications of diffraction grating, diffraction wave front aberration directly affects the grating resolution.

摘要 ： 波前像差是衍射光栅的重要技术指标， 它直接影响光栅的分辨率。

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