Focusing of doughnut laser beams by a high numerical-aperture objective in free space.
作者： Djenan Ganic , Xiaosong Gan , Min Gu
DOI: 10.1364/OE.11.002747
关键词:
摘要: We report on, in this letter, a phenomenon that the central zerointensity point of a doughnut beam, caused by phase singularity, disappears in the focus, when such a beam is focused by …
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