weaker plane 中文意思是什麼
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After the focal plane, the focused hollow beam propagated according to a constant angle of divergence, the dss become larger, and the intensity become weaker
經過焦點后，這一聚焦中空光束將以一定的角度發散，它的dss會變得越來越大，光強度變得越來越弱。
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