| Full text | |
| Author(s): |
Almeida, G. F. B.
[1]
;
Martins, R. J.
[1]
;
Otuka, A. J. G.
[1]
;
Siqueira, J. P.
[1]
;
Mendonca, C. R.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Optics Express; v. 23, n. 21, p. 27597-27605, OCT 19 2015. |
| Web of Science Citations: | 4 |
| Abstract | |
We investigated the effect of temporal shaped femtosecond pulses on silicon laser micromachining. By using sinusoidal spectral phases, pulse trains composed of sub-pulses with distinct temporal separations were generated and applied to the silicon surface to produce Laser Induced Periodic Surface Structures (LIPSS). The LIPSS obtained with different sub-pulse separation were analyzed by comparing the intensity of the two-dimensional fast Fourier Transform (2D-FFT) of the AFM images of the ripples (LIPSS). It was observed that LIPSS amplitude is more emphasized for the pulse train with sub-pulses separation of 128 fs, even when compared with the Fourier transform limited pulse. By estimating the carrier density achieved at the end of each pulse train, we have been able to interpret our results with the Sipe-Drude model, that predicts that LIPSS efficacy is higher for a specific induced carrier density. Hence, our results indicate that temporal shaping of the excitation pulse, performed by spectral phase modulation, can be explored in fs-laser microstructuring. (C) 2015 Optical Society of America (AU) | |
| FAPESP's process: | 11/23587-1 - Polymeric structures with carbon nanotubes: laser processing, characterization and applications |
| Grantee: | Adriano José Galvani Otuka |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 12/00702-2 - Coherent Control of nonlinear processes via genetic algorithm: study of spectral phase modulation through principal component analysis |
| Grantee: | Renato Juliano Martins |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication |
| Grantee: | Cleber Renato Mendonça |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 12/03513-6 - Ultra-fast optical spectroscopy applied to photo-chemical reactions. |
| Grantee: | Jonathas de Paula Siqueira |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |