Laser device and method of aligning laser device

A laser device, comprising:

• a light source part that emits a laser beam;
• an optical path adjustment part that reflects the laser beam emitted from the light source part and adjusts an irradiation direction of the laser beam;
• a light distribution part that splits the laser beam reflected from the optical path adjustment part into a plurality of sub-beams and irradiates the plurality of sub-beams to a substrate;
• a drive part that moves the light distribution part and adjusts relative positions between the light distribution part and the substrate;
• a sensing part that senses the plurality of sub-beams emitted from the substrate;
• and
• a control part that adjusts an arrangement of the optical path adjustment part and moves the drive part to adjust an arrangement of the light distribution part, wherein
• the control part generates an image based on a signal sensed by the sensing part and measures an image contrast of the image, and
• the control part records and compares a plurality of image contrasts according to the position of the light distribution part to determine an optimal position of the light distribution part.