An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing.
Micromachines (Basel)
; 13(8)2022 Aug 10.
Article
en En
| MEDLINE
| ID: mdl-36014207
ABSTRACT
In recent years, micro-annular beams have been widely used, which has expanded the possibilities for laser processing. However, the current method of generating an annular beam still has shortcomings, such as spot energy at the center of the produced beam. In this study, a Fresnel zone plate with an annular structure was machined using a femtosecond laser. After focusing, an annular laser beam without a spot in the center was obtained, and the radius and focal length of the annular beam could be easily adjusted. In addition, two annular Fresnel zone plates were concentrically connected to obtain a concentric double-ring beam in the same focal plane. The simulation and experimental results were consistent, providing effective potential for applications related to nontraditionally shaped laser beams.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Micromachines (Basel)
Año:
2022
Tipo del documento:
Article
País de afiliación:
China