Fiber laser operates at 1064nm wavelength which makes it idea to work with metal. Laser-CutZ powerful engraving machine represents latest generation of lasers which is fiber laser.  Unlike YAG or CO2 lasers, fiber laser uses fiber optics to pump diode laser and achieve 1064nm wavelengths.  Main advantage of fiber over YAG is that fiber is more precise, requires significantly less energy and virtually maintenance free.