The right optics
Laser cutting wood is a process of sublimation, therefore precise focusing and the right kind of optics are important. A distinction needs to be made between engraving and cutting. While engraving, please pay attention to the following: The finer the details are, the shorter your lens' focal length must be. Generally, 1.5" or 2" lenses are fitting for just about any wood laser engraving. However, for cutting, the material's thickness must be kept in mind. The thicker the material is, the longer the lens' focal length must be. For 1/8" thick wood we recommend you use a 2" lens. For 1/4" thick we recommend a 2.5" lens.
Further details on the right choice of lens