Patent ID: 8145046

Claim:
A heat treatment apparatus for heating a substrate by light irradiation of the substrate, the apparatus comprising: a holder for holding a substrate; a light irradiation part for irradiating the substrate held by said holder with light; a light-emission controller for controlling an emission output of said light irradiation part, said light-emission controller being configured to control an emission output of said light irradiation part in such a manner that, within a time range that a total time of light irradiation is one second or less, light irradiation of a substrate is performed, producing an output waveform that reaches a peak at a first emission output, and then after said peak, supplemental light irradiation of the substrate is performed, producing an emission output smaller than said first emission output, wherein said light-emission controller is configured to control the emission output of said light irradiation part in such a manner that said supplemental light irradiation is started after said peak and when the emission output becomes two thirds or less said first emission output.