Patent ID: 7524712

Claim:
A method for manufacturing a semiconductor device comprising: forming a non-single crystal semiconductor film over a substrate, shaping a beam into a second beam via a light-blocking film wherein the second beam has a wavelength range in which an absorption coefficient to the non-single crystal semiconductor film is 5×10 2 /cm or less and an absorption coefficient to a melted state of the non-single crystal semiconductor film is 5×10 3 /cm or more; irradiating a first beam having a wavelength range in which an absorption coefficient to the non-single crystal semiconductor film is 5×10 3 /cm or more simultaneously with the second beam in such a way that the first beam and the second beam are overlapped on the non-single crystal semiconductor film, and moving the non-single crystal semiconductor film to a first direction relative to the first beam and the second beam.