Patent ID: 8114217
Filing Date: 2012-02-14
Classification: B23K,C30B,H01L,Y10T

Abstract:
1. A projection type crystallization apparatus which crystallizes a non-single-crystal semiconductor thin film by irradiating laser beam thereto, comprising: a homogenizer configured to make pulse laser light incident thereon to transform the pulse laser beam into a plurality of light fluxes incident at different angles, homogenize the pulse laser beam in light intensity by these plurality of light fluxes, and emit the thus homogenized pulse laser beam; a phase modulation optical system configured to modulate the pulse laser beam by making the plurality of the light fluxes of the different angles incident on the phase modulation optical system including a plurality of phase modulation sections to form a repetitious pattern in which the light intensity of the pulse laser beam homogenized by the homogenizer passes through the phase modulation optical system to repeat a monotonous increase and a monotonous decrease, in a light intensity distribution in which maximum peaks of the light intensity of the repetitious pattern are equal to each other and so are minimum peaks, and emit the modulated pulse laser beam therefrom; and an image formation optical system configured to form an image of the pulse laser light phase-modulated by the phase modulation optical system on the laser beam incident surface, and melt the non-monocrystalline semiconductor film of an image-forming region.