Creating antireflective surfaces through ultrashort pulsed laser microstructuring

Abstract: In this research, intensive efforts were made to develop processes and laser parameters for creating angle-independent, deep black microstructures on flat test samples. The goal was to vary parameters such as power, pulse duration, frequency, and repetition rate to alter the reflective properties of metallic surfaces used in endoscopic instruments. It was crucial that these surfaces retained their anti-reflective properties and resisted corrosion even after repeated cleaning and sterilization. By systematically varying the parameters, a wide range of structures with distinct shapes and sizes were produced. Notably, pulse duration and repetition rate significantly impacted nanostructure formation. Combining micro- and nanostructures resulted in complex structures that effectively reduced reflections. Qualitative evaluations and cost estimates indicated that smaller structures could be produced more cost-effectively and quickly. Overall, the project achieved significant progress in developing laser processes and parameters for durable, highly absorptive surfaces suitable for medical instruments.