Parabolic or aspheric mirrors are used for beam focusing of all laser power classes and are typically used as the last mirror in the beam guidance system of a laser cutting or welding application. The higher the surface quality and shape accuracy, the better the beam quality reaching the workpiece.

These mirrors are available with or without direct water-cooling and typically have a tough molybdenum coating, or other high quality protective or reflection enhancing coating. Generally, the form accuracies achieved in their manufacturing on LT Ultra precision machines are in the order of ± (0.5µm/100mm) with surface finishes in the order of 2 to 15nm Ra.

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