| 摘要 |
PURPOSE:To improve processing performance by transmitting oscillated laser beams through a proper number of crystalline bodies for higher harmonic wave conversion and converting the beams to the wavelengths at which the beams are easily absorbed into a work to be processed, then processing the work. CONSTITUTION:The laser beam emitted by a YAG laser is transmitted through the crystalline body (second harmonic wave generating body) SHG for second harmonic wave conversion at the prescribed wavelength, by which the wavelength thereof is converted to a half. This second harmonic wave is green visible light. The laser beam emitted by the YAG laser and the wavelength transmitted through the second harmonic wave generating body is synthesized and the synthesized light is transmitted through the third harmonic wave generating body THG, by which its wavelength is converted. While the third harmonic wave is not visible light, the absorptivity of the metallic material is further improved. The laser beams are similarly transmitted through a proper number of the higher harmonic wave generating bodies SHG, THG, 4HG, 5HG and are converted to the wavelengths at which the beams are liable to be absorbed in the work. The laser absorptivity of the work is improved and the processing performance is improved by using the higher harmonic waves of the YAG laser in this way. |
