Metal foams are a porous cellular structure of open-cell or closed-cell foam typically composed of aluminum but are also produced from other metals including copper, nickel, and iron. Laser processing of metal foam can be performed with either a 9.3 or 10.6 micron CO₂ laser or a 1.06 micron fiber laser. Laser engraving of metal foam with a 1.06 micron fiber laser produces some depth that can be lighter or darker depending upon the substrate processed. The 1.06 micron fiber laser can also be used to laser mark metal foam and creates a dark mark by either annealing or oxidizing the surface depending on the material composition. Laser marking of metal foam with a CO₂ laser and an HPDFO® lens will produce a clear dark mark on the surface of the material. Laser cutting of metal foam is not recommended with the 9.3, 10.6, or 1.06 micron wavelengths.