| 摘要 |
PURPOSE:To reduce the energy load of a laser light and to enable the use for long term by forming at the center part a through hole smaller than the diameter of a laser light incident on the optical lens for laser. CONSTITUTION:The through hole 6 formed at the center of a lens 5 is of the diameter small enough compared with the diameter of a laser light 7. Therefore, the light at the center having higher energy is not directly absorbed by the lens 5. Only the lower energy laser light of the environmental part is condensed by passing through the lens 5. Also, due to the laser light of the center part passing through the hole 6 linearly propagating as it is, it is collected to the converging part of the laser light. Consequently, the laser light can be converged in the necessary diameter by the lens 5 by reducing the size of the through hole 6 move than the diameter of the laser light. |
