Product Code: ICA10_N203

Micro-hole Drilling on Cemented Tungsten Carbide by Ultrashort Laser Pulses
Authors:
Khai Pham Xuan, Department of Mechanical Engineering, Nagaoka University of Technology; Nagaoka, Niigata Japan
Yoshiro ITO, Department of Mechanical Engineering, Nagaoka University of Technology; Nagaoka Japan
Kazuya Saginawa, Department of Mechanical Engineering, Nagaoka Unviersity of Technology; Nagaoka, Niigata Japan
Rie Tanabe, Department of Mechanical Engineering, Nagaoka University of Technology; Nagaoka, Niigata Japan
Presented at ICALEO 2010

Micro-holes of 100 to 300 m diameters have been drilled on plates of cemented tungsten carbide of 0.5 to 1mm thick using ultrashort laser pulses. Laser was scanned by a galvano-scanner with scan speed of 0.035 to 15 mm/s and focused by a lens with 80 mm focal length. Effects of scan speed, focus position and polarization of the laser, linear vs. circular, were examined. It is found that the polarization of the laser has profound effects on the shape of the drilled hole: circularly polarized laser results in more straight, less tapered holes than the linearly polarized one in shorter times. Position of the focus relative to the sample surface affects to the hole shape, too. Periodic surface structures with 260 to 300 nm periods are formed on the side of drilled holes regardless the polarization of the laser.