A laser beam optical system for an LCD device includes a laser light source, a variable attenuator for controlling an intensity of a laser light from the laser light source, a telescope lens for gathering the laser light having the controlled intensity from the variable attenuator in the length and width directions, a beam homogenizer including a filter for controlling a sectional profile of the laser light from the telescope lens vertical to the length direction, a condenser for focusing the laser light from the beam homogenizer, and a target to which the laser light is irradiated.