Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses
We report on the formation of homogeneous nanostructures using a two-step ablation process with square flattop beams of femtosecond (fs) laser pulses. The Gaussian beam output from a ytterbium fs laser system was converted to a square flattop beam by a refractive beam shaper and a square mask. This...
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MDPI AG
2025-02-01
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| Online Access: | https://www.mdpi.com/2079-4991/15/5/355 |
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| author | Takemasa Sumimoto Godai Miyaji |
| author_facet | Takemasa Sumimoto Godai Miyaji |
| author_sort | Takemasa Sumimoto |
| collection | DOAJ |
| description | We report on the formation of homogeneous nanostructures using a two-step ablation process with square flattop beams of femtosecond (fs) laser pulses. The Gaussian beam output from a ytterbium fs laser system was converted to a square flattop beam by a refractive beam shaper and a square mask. This beam was split into two with a diffraction optical element, and then the downsized beams were spatially and temporally superimposed on a titanium surface. In the first step, the interference fringes of these two beams formed grooves with a period of 1.9 µm through ablation. Next, the surface was irradiated at normal incidence by a single beam to form a homogeneous line-like nanostructure with a period of 490 nm in a 53 μm square area. This nanostructure had a constant period and was formed over 95% of the laser-processed area, indicating that the ratio between the nanostructure and modification area was over six times larger than that for a Gaussian beam. |
| format | Article |
| id | doaj-art-fd036fd0dae74f838dc915f642b40106 |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-fd036fd0dae74f838dc915f642b401062025-08-20T02:59:15ZengMDPI AGNanomaterials2079-49912025-02-0115535510.3390/nano15050355Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser PulsesTakemasa Sumimoto0Godai Miyaji1Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei 184-8588, Tokyo, JapanFaculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei 184-8588, Tokyo, JapanWe report on the formation of homogeneous nanostructures using a two-step ablation process with square flattop beams of femtosecond (fs) laser pulses. The Gaussian beam output from a ytterbium fs laser system was converted to a square flattop beam by a refractive beam shaper and a square mask. This beam was split into two with a diffraction optical element, and then the downsized beams were spatially and temporally superimposed on a titanium surface. In the first step, the interference fringes of these two beams formed grooves with a period of 1.9 µm through ablation. Next, the surface was irradiated at normal incidence by a single beam to form a homogeneous line-like nanostructure with a period of 490 nm in a 53 μm square area. This nanostructure had a constant period and was formed over 95% of the laser-processed area, indicating that the ratio between the nanostructure and modification area was over six times larger than that for a Gaussian beam.https://www.mdpi.com/2079-4991/15/5/355femtosecond laser processingLIPSSnanostructure formationbeam shapingflattop beam |
| spellingShingle | Takemasa Sumimoto Godai Miyaji Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses Nanomaterials femtosecond laser processing LIPSS nanostructure formation beam shaping flattop beam |
| title | Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses |
| title_full | Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses |
| title_fullStr | Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses |
| title_full_unstemmed | Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses |
| title_short | Formation of Homogeneous Nanostructure via Interference of Square Flattop Femtosecond Laser Pulses |
| title_sort | formation of homogeneous nanostructure via interference of square flattop femtosecond laser pulses |
| topic | femtosecond laser processing LIPSS nanostructure formation beam shaping flattop beam |
| url | https://www.mdpi.com/2079-4991/15/5/355 |
| work_keys_str_mv | AT takemasasumimoto formationofhomogeneousnanostructureviainterferenceofsquareflattopfemtosecondlaserpulses AT godaimiyaji formationofhomogeneousnanostructureviainterferenceofsquareflattopfemtosecondlaserpulses |