Low power CO2 lasers have rarely been used for metal marking, but with the advent of a new marking material, low power CO2 lasers have achieved high speed, high quality marking. Many of the limitations for low power laser marking applications are due to the high reflectivity of the materials. The reflectivity can be mechanically altered by roughing the surface or by coating the surface with an alternate material. The results of a testing program that exploits the application of a marking fluid to allow low power CO2 lasers to mark substrates, such as metals, are presented, and the test parameters and results are provided.

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