Fundamental Investigation on Reduction of Surface Roughness for Mold Material by Green μs Pulsed Laser

Abstract

Reduction of surface roughness was experimentally investigated for mold material by controlling the pulse duration and the waveform of microsecond pulsed Nd:YAG laser with 532nm wavelength, which stabilizes the absorption of laser energy to material. In the case of rectangular pulse waveform, the range of power density without the edge formation becomes wider around 4.5 μs pulse duration. The wider range of power density without the edge formation can be achieved by controlling the pulse waveform, and the surface roughness can be reduced by apporoximately 1/4.