Patent ID: 7347897

Claim:
A crystallization apparatus which irradiates a non-single-crystal semiconductor film with a luminous flux having a predetermined light intensity distribution to crystallize the semiconductor film, comprising: a phase modulation device comprising a plurality of unit areas which are arranged in a certain period and which mutually have substantially the same pattern; and an optical image forming system disposed between the phase modulation device and the non-single-crystal semiconductor film, each of the unit areas of the phase modulation device comprising: a reference face having a certain phase; a first area disposed in the vicinity of a center of each unit area and having a first phase difference with respect to the reference face; and a second area disposed in the vicinity of the first area and having substantially the same phase difference as the first area with respect to the reference face; and a plurality of third area disposed around the first and second areas, each of the third areas having substantially the same phase difference as the first area with respect to the reference face, the sizes of the third areas varying in accordance with distances between the third areas and the center of each of the unit areas, wherein: the predetermined light intensity distribution has a plurality of unit distribution areas, each of the unit distribution areas corresponding to each of the unit areas of the phase modulation device; and each of the unit distribution areas has an inversely peaked pattern whose light intensity increases radially toward periphery from a bottom peak, the bottom peak corresponding to the center of each of the unit areas.