Arrays of 3D micro-columns generated by laser ablation of Ta and steel: modelling of a black body emitter

Abstract

Three-dimensional extended arrays of micro-columns are generated on the surface of Ta and several stainless steels by their ablation by radiation of a Cu vapor laser either in vacuum or in air. The reflectivity of the arrays is tested in both visible and near-IR regions using the facilities at NASA Johnson Space Center. The reflectivity of the laser-treated areas was found to be very low (0.03–0.08) in the range 250–2800 nm. The emissivity of 3D arrays measured at elevated temperatures is close to the emissivity of a calibrated black body emitter. The effects of the experimental conditions of ablation (laser fluence, environment, etc.) on the integral optical characteristics of the generated arrays are discussed.

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Correspondence to G.A. Shafeev.

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PACS

42.62.-b; 79.20.Ds; 81.15.Fg

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Bensaoula, A., Boney, C., Pillai, R. et al. Arrays of 3D micro-columns generated by laser ablation of Ta and steel: modelling of a black body emitter. Appl. Phys. A 79, 973–975 (2004). https://doi.org/10.1007/s00339-004-2588-z

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Keywords

  • Radiation
  • Stainless Steel
  • Elevated Temperature
  • Emissivity
  • Laser Ablation