Laser ablation of silicon with THz bursts of femtosecond pulses
Abstract In this work, we performed an experimental investigation supported by a theoretical analysis, to improve knowledge on the laser ablation of silicon with THz bursts of femtosecond laser pulses. Laser ablated craters have been created using 200 fs pulses at a wavelength of 1030 nm on silicon...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-92645-7 |
| _version_ | 1818839198083317760 |
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| author | Caterina Gaudiuso Pavel N. Terekhin Annalisa Volpe Stefan Nolte Bärbel Rethfeld Antonio Ancona |
| author_facet | Caterina Gaudiuso Pavel N. Terekhin Annalisa Volpe Stefan Nolte Bärbel Rethfeld Antonio Ancona |
| author_sort | Caterina Gaudiuso |
| collection | DOAJ |
| description | Abstract In this work, we performed an experimental investigation supported by a theoretical analysis, to improve knowledge on the laser ablation of silicon with THz bursts of femtosecond laser pulses. Laser ablated craters have been created using 200 fs pulses at a wavelength of 1030 nm on silicon samples systematically varying the burst features and comparing to the normal pulse mode (NPM). Using bursts in general allowed reducing the thermal load to the material, however, at the expense of the ablation rate. The higher the number of pulses in the bursts and the lower the intra-burst frequency, the lower is the specific ablation rate. However, bursts at 2 THz led to a higher specific ablation rate compared to NPM, in a narrow window of parameters. Theoretical investigations based on the numerical solution of the density-dependent two temperature model revealed that lower lattice temperatures are reached with more pulses and lower intra-burst frequencies, thus supporting the experimental evidence of the lower thermal load in burst mode (BM). This is ascribed to the weaker transient drop of reflectivity, which suggests that with bursts less energy is transferred from the laser to the material. This also explains the trends of the specific ablation rates. Moreover, we found that two-photon absorption plays a fundamental role during BM processing in the THz frequency range. |
| first_indexed | 2024-12-19T03:50:28Z |
| format | Article |
| id | doaj.art-36584e59f43648beb64ac84bdd124185 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-19T03:50:28Z |
| publishDate | 2021-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-36584e59f43648beb64ac84bdd1241852022-12-21T20:37:00ZengNature PortfolioScientific Reports2045-23222021-06-0111111110.1038/s41598-021-92645-7Laser ablation of silicon with THz bursts of femtosecond pulsesCaterina Gaudiuso0Pavel N. Terekhin1Annalisa Volpe2Stefan Nolte3Bärbel Rethfeld4Antonio Ancona5Department of Physics, University of Bari “Aldo Moro”Department of Physics and Research Center OPTIMAS, Technische Universität KaiserslauternDepartment of Physics, University of Bari “Aldo Moro”Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-Universität JenaDepartment of Physics and Research Center OPTIMAS, Technische Universität KaiserslauternDepartment of Physics, University of Bari “Aldo Moro”Abstract In this work, we performed an experimental investigation supported by a theoretical analysis, to improve knowledge on the laser ablation of silicon with THz bursts of femtosecond laser pulses. Laser ablated craters have been created using 200 fs pulses at a wavelength of 1030 nm on silicon samples systematically varying the burst features and comparing to the normal pulse mode (NPM). Using bursts in general allowed reducing the thermal load to the material, however, at the expense of the ablation rate. The higher the number of pulses in the bursts and the lower the intra-burst frequency, the lower is the specific ablation rate. However, bursts at 2 THz led to a higher specific ablation rate compared to NPM, in a narrow window of parameters. Theoretical investigations based on the numerical solution of the density-dependent two temperature model revealed that lower lattice temperatures are reached with more pulses and lower intra-burst frequencies, thus supporting the experimental evidence of the lower thermal load in burst mode (BM). This is ascribed to the weaker transient drop of reflectivity, which suggests that with bursts less energy is transferred from the laser to the material. This also explains the trends of the specific ablation rates. Moreover, we found that two-photon absorption plays a fundamental role during BM processing in the THz frequency range.https://doi.org/10.1038/s41598-021-92645-7 |
| spellingShingle | Caterina Gaudiuso Pavel N. Terekhin Annalisa Volpe Stefan Nolte Bärbel Rethfeld Antonio Ancona Laser ablation of silicon with THz bursts of femtosecond pulses Scientific Reports |
| title | Laser ablation of silicon with THz bursts of femtosecond pulses |
| title_full | Laser ablation of silicon with THz bursts of femtosecond pulses |
| title_fullStr | Laser ablation of silicon with THz bursts of femtosecond pulses |
| title_full_unstemmed | Laser ablation of silicon with THz bursts of femtosecond pulses |
| title_short | Laser ablation of silicon with THz bursts of femtosecond pulses |
| title_sort | laser ablation of silicon with thz bursts of femtosecond pulses |
| url | https://doi.org/10.1038/s41598-021-92645-7 |
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