IN-PROCESS MONITORING OF FEMTOSECOND LASER MATERIAL PROCESSING

Recent research and development on the femtosecond laser has shown that it is a powerful tool for high precision micromachining. However, the femtosecond laser-material interaction is fast and complex due to its ultrashort pulse duration. Consequently, it is not an easy task to optimize process parameters and to ensure high-quality fabrication. In this context, we propose an in-line monitoring technique based on plasma plume diagnostics. By analyzing the spectra of the femtosecond laser-induced plasma, which was detected and analyzed using a spectrometer, the plasma temperature of the copper sample was estimated. As drilling holes and cutting lines are two common applications in industry, the relationship between the emission light and the geometry of the fabricated structure was investigated based on the time-varying signals from the photodetector. These results will help us to understand the mechanism of femtosecond laser ablation so as to achieve high quality micromachining.

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Femtosecond Laser Material Processing - How Short is Short?

Springer Series in Chemical Physics - Ultrafast Phenomena XIV ◽

10.1007/3-540-27213-5_250 ◽

2005 ◽

pp. 819-821

Author(s):

Yehiam Prior ◽

Kaiyin Zhang ◽

V. Batenkov ◽

Yuri Paskover ◽

I.Sh. Averbukh ◽

...

Keyword(s):

Material Processing ◽

Femtosecond Laser ◽

Laser Material Processing ◽

Laser Material

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Engineering of high quality factor THz metasurfaces by femtosecond laser ablation

Optics & Laser Technology ◽

10.1016/j.optlastec.2020.106159 ◽

2020 ◽

Vol 128 ◽

pp. 106159 ◽

Cited By ~ 2

Author(s):

Gian Paolo Papari ◽

Jijil J.J. Nivas ◽

Can Koral ◽

Elaheh Allahyari ◽

Salvatore Amoruso ◽

...

Keyword(s):

Laser Ablation ◽

Femtosecond Laser ◽

Quality Factor ◽

Femtosecond Laser Ablation ◽

High Quality Factor ◽

High Quality

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The Influence of DOS Effects on Ablation Properties in High Energy Femtosecond Laser Ablation Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.689.11 ◽

2011 ◽

Vol 689 ◽

pp. 11-15 ◽

Cited By ~ 1

Author(s):

Hui Li Wei ◽

Feng Mao ◽

Xin Yu Tan ◽

Xiang Ping Huang ◽

Zhao Wang ◽

...

Keyword(s):

Laser Ablation ◽

Femtosecond Laser ◽

Femtosecond Laser Ablation ◽

High Energy ◽

Gold Target ◽

Laser Ablation Process ◽

Electron Phonon Coupling ◽

Melting Threshold ◽

Electronic Heat ◽

The Relationship

The numerical simulation of high-energy femtosecond laser ablation on metal target is studied in this paper. Based on the two-temperature model (TTM), a new model considering the effects of the electron density of states (DOS) on electronic heat capacity, electron-phonon coupling coefficient and electronic thermal conductivity is established. As an example of gold target, the relationship between the melting threshold and the thickness of gold films is numerically calculated. Our result is more consistent with the experimental datum in contrast to the results without considering the DOS effects. This shows that the revised TTM of high-energy femtosecond laser ablation (i.e. DOS-TTM) is more reasonable compared with general used TTM.

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Periodic Nano-Structure Formation with Femtosecond Laser Ablation and Patterning of Silicon

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.275-277.2186 ◽

2013 ◽

Vol 275-277 ◽

pp. 2186-2189

Author(s):

Jian Ting Xu ◽

Dong Qing Yuan

Keyword(s):

Femtosecond Laser ◽

Pulse Length ◽

Femtosecond Laser Ablation ◽

Objective Lens ◽

Micro Machining ◽

Nano Structure ◽

Laser Micro Machining ◽

Silicon Bulk ◽

The Relationship ◽

Focused Beam

Regular micro-apparatus which covered with periodic nano-hole, nano-ridge and ripple structures on silicon bulk were formed by laser micro-machining with tightly focused beam of the femtosecond laser with wavelength of 800 nm, repetition rate of 1 kHz and the pulse length of 130 fs in air. The periodic nano-hole structures which focus with a 20× focusing objective lens (NA = 0.4) is reported. Investigating the relationship between the width of structures and the speed of processing.

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Preface of the 18th NOLAMP conference

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1135/1/011001 ◽

2021 ◽

Vol 1135 (1) ◽

pp. 011001

Keyword(s):

Material Processing ◽

Scientific Community ◽

High Efficiency ◽

Nordic Countries ◽

Laser Material Processing ◽

High Quality ◽

Laser Material ◽

Fruitful Cooperation ◽

Young Researchers

Abstract About the conference: The first conference on Nordic Laser Material Processing, NOLAMP was held in Oslo in 1987. Then the laser material processing was a rather new and revolutionary way to manufacture products with high quality and high efficiency. The laser research in the Nordic countries was in its pioneering age and the enthusiasm among researchers for the new possibilities was unrivalled. The intention for creating this conference, which was originally suggested by Dr. Bernt Thorstensen at SI in Oslo, Norway, was to establish a fruitful cooperation among Nordic laser researchers. Also NOLAMP intended to provide a forum for young researchers to present on-going works and to establish contacts in the scientific community as well as in industry. List of Conference date and location, Conference topics, Keynote speakers, Sponsors, Committee members, Editors, Reviewers are available in this pdf.

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