聚焦中空光束
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hollow focused laser beam 聚焦空心光束
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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.
经过焦点后，这一聚焦中空光束将以一定的角度发散，它的DSS会变得越来越大，光强度变得越来越弱。
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