The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
A system of coordinates in which a point is located by its distance and direction (Angle) from a fixed point on a reference line (called the polar axis).
一种用点离基准线上(称极轴)固定点的距离和方向(角度)来表示点位置的坐标系统。
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