Abstract: A tool-changing carrier, that is to say a tool turret (1) with a rotary turret unit having at least two tool mounts (9) and arranged such that it can be rotated relative to a basic turret body (12), has radiation-transmission means which are provided for passing electromagnetic radiation through the tool-changing carrier or along the same. A tool system comprises such a tool-changing carrier and at least two tool heads (3, 5, 15, 17, 18, 27, 34, 40, 43), intended for fixing on the tool mounts (9), wherein at least one tool head is an optical tool head (3, 15, 17, 18) which is suitable for exposing a workpiece (11) to electromagnetic radiation and has a tool optics unit (23) for deflecting and/or forming the electromagnetic radiation.