Abstract
This study is focused on the basic mechanism of the laser coloring technique to the titanium by using Nd/YVO_4 laser. Relation between laser irradiation parameters and obtained color has been carefully investigated by color evaluation and surface roughness measurement. The obtained colors changed as the input energy increase and the trend of color change matched qualitatively to the theoretical estimation assuming that the thickness of the layer becomes higher by increase of the input energy. On the other hand, as the surface became rough, the color became dark. Therefore it can be concluded that if laser parameters are suitably controlled, arbitrary value of hue and brightness can be obtained.
