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. 2016 Apr 6;6:23494. doi: 10.1038/srep23494

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(a) Normalized peak intensity of the focal spot at different lateral scanning positions and focal distances. (b) Theoretical and experimental full width at of the intensity profile at different focal distances.

Inline graphic — (a) Normalized peak intensity of the focal spot at different lateral scanning positions and focal distances. (b) Theoretical and experimental full width at of the intensity profile at different focal distances.