| 摘要 |
<p>Provided are an optical system and a laser processing apparatus with which the energy intensity distribution of laser light at a processing point can be made higher in a peripheral region than in a center region in a simple manner. An optical system (7 )is provided with a collimating lens group 8 that emits laser light including parallel rays; an axicon lens (9) that has a circular conical shape and into which the light emitted from the collimating lens group (8) enters; and a focusing lens group (10) that focuses the light emitted from the axicon lens (9), wherein a conical surface of the axicon lens (9) is positioned on the collimating lens group (8) side, and a flat surface of the axicon lens (9) is positioned on the focusing lens group (10) side.</p> |
