Patent ID: 7102750

Claim:
A method of in-situ monitoring of a crystallization state in annealing processing through irradiation of a thin film by an energy line having a light intensity distribution of an inverted peak pattern for at least one of crystallization of said thin film and promotion of the crystallization, melting an irradiation region or growing said crystallization laterally after termination of said energy line irradiation, comprising: simultaneously irradiating, by a monitor light, at least a plurality of monitoring places in a region having a predetermined area of at least one of the surface and the underside of said thin film directly or through a substrate, at least during or after one of before, during or after said energy line irradiation, said monitor light being for monitoring of the crystallization state of said thin film; and measuring a temporal change of the intensity of at least one of a reflected light or a transmitted light, from said surface or said underside of said thin film, said monitor light as a light intensity distribution related to the positions of said monitoring places.