According to the present invention, provided is an optical mask comprising a photothermal conversion pattern layer patterned into high/low absorption areas. More specifically, a heat absorption profile of the photothermal conversion pattern layer can be improved from a Gaussian profile to a rectangular profile as the low absorption areas are arranged between the high absorption areas. The optical mask comprises: a light-transmissive base substrate; a reflection pattern layer formed on one surface of the light-transmissive base substrate; and the photothermal conversion pattern layer formed on the reflection pattern layer.
