Laser machining device

A laser machining device comprising:

• a broadband light source, which generates a broadband laser beam;
• a first lens unit to which the broadband laser beam is incident and having a first effective focal length;
• a second lens unit spaced apart from the first lens unit in a first direction and having a second effective focal length;
• a beam splitter disposed between the first lens unit and the second lens unit, and which is movable in the first direction and a direction opposite to the first direction within the first effective focal length from the first lens unit, and splits the broadband laser beam passing through the first lens unit into a plurality of sub-laser beams;
• a focusing lens spaced apart from the second lens unit in the first direction, and which focuses the sub-laser beams passing through the second lens unit on a substrate;
• and
• wherein a first chromatic aberration by the beam splitter is compensated by a second chromatic aberration by a combination of the first lens unit and the second lens unit.