| 摘要 |
PURPOSE:To further improve the absorption rate of laser beam and to efficiently utilize energy in the laser beam at the time of executing the laser beam machining without coating the surface of a material to be machined with an absorber by irradiating the material with linear polarized laser beam toward P polarized beam. CONSTITUTION:At the time of executing the laser beam machining without coating the surface of the material with an absorber by irradiating the material with the linear polarized laser beam toward the P polarized beam, in which electric field vector of incoming laser beam is in parallel to incident plane, while injecting gaseous oxygen or gas containing 25% gaseous oxygen toward at least laser beam irradiating part 3 or in the vicinity of the material 2 to be machined through a gas nozzle 4, etc., the material is irradiated with the laser beam 1. |
