A Metal Matrix Composite is a material in which one primary constituent part is a metal. The other components of the composite may be another metal, a ceramic, or an organic compound. Popular metal matrix composites include tungsten carbide, boron nitride, and aluminum graphite. Laser processing of metal matrix composite can be performed with a 1.06 micron fiber laser. Laser processing of metal matrix composite with a 9.3 or a 10.6 micron CO₂ laser is not feasible due to the poor absorption of the ceramic material at those wavelengths. Laser marking of metal matrix composites with a CO₂ laser creates a permanent mark that can be either light or dark depending upon the material processed. Laser engraving or laser cutting of metal matrix composites are not recommended with the 9.3, 10.6, or 1.06 micron lasers as the material does not significantly ablate at these wavelengths.