Each type of laser creates a laser beam at a given wavelength. The CO2 generators are the most used for steel cutting with a wavelength 10.6 μm, whilst the Nd:YAG lasers generate a beam with a wavelength of 1.06 μm. In general, the Nd:YAG lasers wavelength is better absorbed by most of materials (copper, aluminium, precious metals, …). Steel, however, has acceptable absorption levels for the beam generated by CO2. This, added to the fact that these CO2 generators are more powerful and cheaper, explains why their use in industry is much more widespread.