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。
The fastest rotated speed of principal axis motor of optical disc driver has reached about 12000rpm nowadays.
现今光盘驱动器主轴马达的最高转速约为每分钟12000转。
The fastest rotated speed of principal axis motor of optical disc driver has reached about 12000rpm nowadays.
现今光盘驱动器主轴马达的最高转速约为每分钟12000转。
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