Single pulse femtosecond laser ablation of silicon – a comparison between experimental and simulated two-dimensional ablation profiles
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Regina Moser
und
Gerd Marowsky
Abstract
Ultrashort laser pulses are widely used for the precise structuring of semiconductors like silicon (Si). We present here, for the first time, a comparative study of experimentally obtained and numerically simulated two-dimensional ablation profiles based on parameters of commercially relevant and widely used near-infrared and diode pumped femtosecond lasers. Single pulse laser ablation was studied at a center wavelength of 1040 nm and pulse duration of 380 fs (FWHM) in an irradiating fluence regime from 1 J/cm2 to 10 J/cm2. Process thresholds for material transport and removal were determined. Three regimes, scaling with the fluence, could be identified: low and middle fluence regimes and a hydrodynamic motion regime. By comparing the simulated and experimental ablation profiles, two conclusions can be drawn: At 2 J/cm2, the isothermal profile of 3800 K is in excellent agreement with the observed two-dimensional ablation. Thus exceeding a temperature of 3800 K can be accepted as a simplified ablation condition at that fluence. Furthermore, we observed a distinct deviation of the experimental from the simulated ablation profiles for irradiated fluences above 4 J/cm2. This points to hydrodynamic motion as an important contributing mechanism for laser ablation at higher fluences.
Acknowledgments
This work was partly funded by the Bundesministerium für Wirtschaft und Energie (BMWi) in the project MONOSCRIBE (grant no. 0325922A) and by the DFG in grant no. HU1893/2-1. Support by Spectra Physics Austria is further acknowledged for close collaboration and financial support of the Josef Ressel Centre for material processing with ultrashort pulsed lasers. The financial support by the Austrian Federal Ministry of Economy, Family and Youth and the National Foundation for Research, Technology and Development is gratefully acknowledged.
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Artikel in diesem Heft
- Cover and Frontmatter
- Community
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- Editorial
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- Topical Issue: Optical Materials Part 1
- Tutorial
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- Frequency-dependent electro-optics of liquid crystal devices utilizing nematics and weakly conducting polymers
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Artikel in diesem Heft
- Cover and Frontmatter
- Community
- News
- Editorial
- Optical materials
- Topical Issue: Optical Materials Part 1
- Tutorial
- Parametric analysis of thin multifunctional elastomeric optical sheets
- Review Article
- Deep-UV materials
- Research Articles
- Frequency-dependent electro-optics of liquid crystal devices utilizing nematics and weakly conducting polymers
- Design of a 1D phase-mask translational scanner for large-size spatially coherent grating printing
- Single pulse femtosecond laser ablation of silicon – a comparison between experimental and simulated two-dimensional ablation profiles
