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Technologies 2016, 4(1), 7;

Drilling of Copper Using a Dual-Pulse Femtosecond Laser

Department of Mechanical Engineering, National Chiao Tung University, No. 1001, Ta Hsueh Road, Hsinchu 30010, Taiwan
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)
PDF [2057 KB, uploaded 23 February 2016]


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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Cheng, C.-W.; Chen, J.-K. Drilling of Copper Using a Dual-Pulse Femtosecond Laser. Technologies 2016, 4, 7.

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