An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Micromachines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-666X/13/8/1285 |
| _version_ | 1797408843358011392 |
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| author | Xiaoyan Sun Fang Zhou Lian Duan |
| author_facet | Xiaoyan Sun Fang Zhou Lian Duan |
| author_sort | Xiaoyan Sun |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T04:04:29Z |
| format | Article |
| id | doaj.art-53a7b1dc93384abaad2bad4fbd6b1320 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T04:04:29Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-53a7b1dc93384abaad2bad4fbd6b13202023-12-03T14:08:13ZengMDPI AGMicromachines2072-666X2022-08-01138128510.3390/mi13081285An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct WritingXiaoyan Sun0Fang Zhou1Lian Duan2State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, ChinaState Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, ChinaState Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, ChinaIn 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.https://www.mdpi.com/2072-666X/13/8/1285Fresnel zone plateannular structurefemtosecond laser machiningconcentric double-ring beams |
| spellingShingle | Xiaoyan Sun Fang Zhou Lian Duan An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing Micromachines Fresnel zone plate annular structure femtosecond laser machining concentric double-ring beams |
| title | An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing |
| title_full | An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing |
| title_fullStr | An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing |
| title_full_unstemmed | An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing |
| title_short | An Annular Fresnel Zone Plate without Central Spots Fabricated by Femtosecond Laser Direct Writing |
| title_sort | annular fresnel zone plate without central spots fabricated by femtosecond laser direct writing |
| topic | Fresnel zone plate annular structure femtosecond laser machining concentric double-ring beams |
| url | https://www.mdpi.com/2072-666X/13/8/1285 |
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