propagation distance

基本解释

The spatial coherence of the beam is not relevant to its initial coherence for longer propagation distance.
长距离传输后，光束空间相干性与光束初始相干长度不再有关。
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We numerically show that there are many extremums in dependence of the propagation distance on the period lengths of perturbation.
数值模拟发现，在脉冲传输距离与扰动周期长度的关系中存在着一种多极值结构。
Therefore, the R of laser beams with larger R in free space will become smaller than the R of those with smaller R in free space after a certain propagation distance in turbulence.
因此，当光束传输到一定距离之后，湍流使得原来在自由空间中较大的R变小，而较小的R变大。