Photopolymers, also called light-activated resin, photosensitive polymer, or photoresistors, are made from various formulations of monomers, oligomers, polymers, and other additives which can be specific to individual processes. Laser processing of most photopolymers can be performed with a 9.3 or 10.6 micron CO₂ laser. The 1.06 micron fiber laser absorption will vary between photopolymers as there is a great deal of variability used in the formulation of photopolymers. Laser cutting of photopolymers with a 9.3 or 10.6 micron CO₂ laser can produce cuts with clean edges with no appreciable difference in the quality produced by either wavelength. Laser engraving of photopolymers with a CO₂ laser creates a clean surface finish and provides precise control over the engraving depth. Laser making of some photopolymers can be done with a 1.06 micron fiber laser to produce a slightly raised dark mark on the surface of the material. Laser marking of photopolymers with a CO₂ laser is not recommended as it produces no contrasting mark.