激光经过被测表面反射和散射后，通过自由空间传播至观察面上形成散斑图像，其统计分布依赖于被测表面的微观形貌。
Speckle images are produced by the reflected and scattered light beams from rough surface through free-space to observing plane when laser illuminates the object surface.
最后，模拟了柱面波在自由空间中的传播及空心圆柱体在柱面波入射下的近场和远场散射特性。
In the end, the propagation of cylindrical wave in free space, and the hollow cylinder scattering characteristics in near field and far field is completed when it is initiated by cylindrical wave.
本文讨论了波导hcn激光器输出的EH11模在自由空间中的传播模式，并与理论进行了比较。
The propagation pattern of the EH11 mode of waveguide HCN laser in free space is discussed and compared with the theory.
本文讨论了波导hcn激光器输出的EH11模在自由空间中的传播模式，并与理论进行了比较。
The propagation pattern of the EH11 mode of waveguide HCN laser in free space is discussed and compared with the theory.
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