| 摘要 |
PURPOSE:To provide the laser beam processing method and device which can apply the decoration changing variously like rainbow colors in the tints of reflection gloss by the angles and the directions of incident light, on a metallic surface. CONSTITUTION:The surface of a metallic work piece 6 is irradiated via a condenser lens 3c with a pulse laser beam 2 which is the linearly polarized light or elliptically polarized light of <=0.3 ellipticity emitted from a laser resonator 1 in the irradiation position deviated in one direction of deep or shallow from the focus of this condenser lens 3c, by which the fine ruggedness corresponding to the interference fringes of the pulse laser beam 2 is formed to the above- mentioned surface. The metallic surface formed with the fine ruggedness spectrally divides and reflects the incident light and, therefore, the reflection gloss changing variously like the rainbow colors in the tints by the angles of viewing and the directions of the incident light is generated. |
