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Here, we tend to report a sapphire-based Fresnel zone plate (FZP), that is fabricated by femtosecond laser direct writing assisted with subsequent wet etching. With this methodology, we have a tendency to solved the problem of high surface roughness caused by ultrafast femtosecond laser processing. We tend to have obtained -nm average surface roughness smaller than one/25 of the optical working wavelength. As-formed sapphire FZP conjointly exhibited a well-defined geometry. More importantly, ultraviolet (UV) light-weight focusing and imaging will be easily achieved. Thanks to the high material hardness, thermal and chemical stabilities of sapphire, such sapphire FZP, may have great potential in UV imaging and focusing underneath some harsh environments.

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