In engraving, marking, cutting and generally material processing , the focus is on actual ablation – that is, material removal. The chemical and optical properties of the exposed material are important, as it absorbs different wavelengths differently and, accordingly, ablation is more or less efficient. While IR lasers are mainly used for material processing of e.g. metals, UV light is particularly absorbed by transparent material. This makes UV and DUV lasers the ideal basis for glass engraving and ophthalmology in general. Due to the small wavelength, it is also possible to have smaller diameters when focusing the laser beam, which allows higher power densities to be achieved. In addition, a much more detailed engraving is possible, since structures can be resolved better.