The invention concerns an apparatus (100) for removing a portion of a coating system present in a multi-glazed window (40) comprising: - decoating means (31) configured to focus a laser source at a focus distance; - two motors (18, 19) configured to move said decoating means (31) along X and Y axis; - one optical system (32-33) configured to detect on which interface said coating system is localized, and to estimate a distance between said decoating means (31) and the detected interface; - a third motor (20) configured to control the position of said decoating means (31) along a Z axis; and - a displacement control unit (27) of said third motor (20) configured to displace said decoating means (31) of a displacement distance equal to the difference between the estimated distance and said focus distance in order to focus said decoating means (31) on said detected interface.
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