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Drilling of Copper Using a Dual-Pulse Femtosecond Laser

1
Department of Mechanical Engineering, National Chiao Tung University, No. 1001, Ta Hsueh Road, Hsinchu 30010, Taiwan
2
Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Chia-Lung Kuo, Jin-Chen Hsu, Chao-Ching Ho and Yuan-Jen Chang
Received: 23 December 2015 / Revised: 4 February 2016 / Accepted: 19 February 2016 / Published: 23 February 2016
(This article belongs to the Special Issue Laser Percussion Drilling Technology)
The drilling of copper using a dual-pulse femtosecond laser with wavelength of 800 nm, pulse duration of 120 fs and a variable pulse separation time (0.1–150 ps) is investigated theoretically. A one-dimensional two-temperature model with temperature-dependent material properties is considered, including dynamic optical properties and the thermal-physical properties. Rapid phase change and phase explosion models are incorporated to simulate the material ablation process. Numerical results show that under the same total laser fluence of 4 J/cm2, a dual-pulse femtosecond laser with a pulse separation time of 30–150 ps can increase the ablation depth, compared to the single pulse. The optimum pulse separation time is 85 ps. It is also demonstrated that a dual pulse with a suitable pulse separation time for different laser fluences can enhance the ablation rate by about 1.6 times. View Full-Text
Keywords: femtosecond laser; dual pulse; two-temperature model femtosecond laser; dual pulse; two-temperature model
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MDPI and ACS Style

Cheng, C.-W.; Chen, J.-K. Drilling of Copper Using a Dual-Pulse Femtosecond Laser. Technologies 2016, 4, 7. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies4010007

AMA Style

Cheng C-W, Chen J-K. Drilling of Copper Using a Dual-Pulse Femtosecond Laser. Technologies. 2016; 4(1):7. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies4010007

Chicago/Turabian Style

Cheng, Chung-Wei, and Jinn-Kuen Chen. 2016. "Drilling of Copper Using a Dual-Pulse Femtosecond Laser" Technologies 4, no. 1: 7. https://0-doi-org.brum.beds.ac.uk/10.3390/technologies4010007

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