Paper 14093-7
Paper 14093-7
Wide-gamut nanosecond laser colouring of titanium via oxygen-controlled oxide films and modelling
12 April 2026 • 17:00 - 17:15 CEST | Curie A (Niveau/Level 1)
Abstract
We study nanosecond laser colouring of commercially pure titanium in atmospheres with controlled O₂/air ratios. By varying oxygen concentration, laser power, and scanning speed, we quantify their influence on oxide growth and resulting colours. An interference-based optical model links oxide thickness and composition to measured reflectance spectra. We show that higher oxygen concentrations accelerate oxide formation and modify oxidation states, enabling a broader and more saturated colour gamut than ambient-air processing. Simulated spectra agree well with experiments, confirming the model. These results highlight controlled oxygen enrichment as a key parameter for efficient, predictable, and wide-gamut laser colouring of titanium for decorative and functional applications.
Presenter
Chen-Wei Hu
National Tsing Hua Univ. (Taiwan)
My name is Chen-Wei Hu, and I am a PhD candidate in the International Intercollegiate Ph.D. Program at National Tsing Hua University, Taiwan. My research spans ultrafast laser processing and laser-induced colouring of metals. I focus on atmosphere-controlled nanosecond laser colouring of titanium, systematically examining how atmosphere and scanning conditions govern oxide growth and composition. I also develop optical models and simulations that link process parameters to spectral responses under different coloring atmospheres.