Beam intensity conversion optical system and beam intensity conversion lens

摘要

The beam intensity conversion optical system (3) of the present disclosure converts the light intensity distribution of the laser light source (4) and the laser beam (1) emitted from the laser light source (4) to irradiate the irradiation region (6). An intensity conversion lens (5), the beam intensity conversion lens (5) has a single lens structure, the position of the paraxial image plane (7) in the beam intensity conversion lens (5), and the irradiation region (6). Are different on the optical axis (8). Further, the beam intensity conversion lens (5) has a longitudinal spherical aberration characteristic on the paraxial image plane (7), and the displacement width of the vertical spherical aberration outside the 70% image height is vertical at the 70% image height. It is within 20% of the spherical aberration.