基于小衍射源和衍射远场的特点,简化了瑞利-索末菲标量衍射积分公式,并应用于分析非傍轴衍射光束的衍射远场总功率和光束传输因子特性。由于物理概念上的空间频谱的定义域局限在一定范围,基于此计算的非傍轴衍射光束的衍射远场总功率不满足能量守恒定律,基于此计算的非傍轴衍射光束的光束传输因子也与常识不符。当采用数学概念上的空间频谱分析上述特性时,两个符合常识的规律被重提,并以非傍轴基模高斯光束衍射远场总功率和光束传输因子的相对计算误差说明上述结论。 Based on the characteristics of small diffraction source and diffraction far field, the Rayleigh-Sommerfeld scalar diffraction integral equation is simplified and applied to analyze the far-field total power of diffraction and the beam propagation factor of the non-paraxial diffraction beam. Since the domain of the physical spectrum concept is limited to a certain range, the total power of the diffracted far field calculated based on this non-paraxial diffraction beam does not satisfy the law of conservation of energy and the beam propagation factor of the non-paraxial diffracted beam calculated based on this Not in common sense. When using the mathematical concept of spatial spectrum analysis of the above characteristics, two common law rules are repeated, and non-paraxial fundamental Gaussian beam diffraction of the far field total power and beam transmission factor relative calculation error illustrate the above conclusion.