Influence of the surface roughness and pulse energy in the production of dimple features on Cr2O3 surfaces.

Laser dimple generation can functionalise ceramic surfaces. Dimple characteristics determine the functionalised surface properties, which has numerous applications. Laser parameters and material properties are key factors in the design of the dimple features. Pulse energy, E p, and average surface roughness, Ra, are important parameters in the dimple production. Thus, the influence of the E p of InfraRed (IR) nanosecond pulsed laser on the dimple characteristics generated on two Cr 2 O 3 surfaces (as-received and polished) are studied in this work. The increase of the E p increased the dimples features (Diameter, D, and depth, L). Polished surfaces gave dimples with increased depth while dimples produced on as-received samples were shallow. The energy fluence ablation threshold, φ th, is higher for as-received surface than for polished Cr 2 O 3. [ABSTRACT FROM AUTHOR]