一维有限孔径时谐辐射的一种解析分析

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给出了计算一维有限孔径时谐辐射的一种简单的解析描述。根据线源叠加理论,在Fresnel近似条件下推得一计算辐射场的积分公式。通过用矩形函数对孔径上场分布函数的加权,并利用矩形函数在[0,∞)区间可以近似为一组高斯函数的线性叠加这一性质,可使场积分直接利用积分公式计算化为一组偏心高斯束的叠加。就同相孔径和线性相移孔径场分布作了数值计算,与文献中的结果作了比较,符合较好。
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