Laser microsculpting for the generation of robust diffractive security markings on the surface of metals

Krystian Lukasz Wlodarczyk, Marcus Ardron, Andrew John Waddie, Andrew Dunn, Matthew Kidd, Nick J. Weston, Duncan Paul Hand

Research output: Contribution to journalArticle

15 Citations (Scopus)
119 Downloads (Pure)

Abstract

We report the development of a laser-based process for the direct writing (‘microsculpting’) of unique security markings (reflective phase holograms) on the surface of metals. In contrast to the common approaches used for unique marking of the metal products and components, e.g., polymer holographic stickers which are attached to metals as an adhesive tape, our process enables the generation of the security markings directly onto the metal surface and thus overcomes the problems with tampering and biocompatibility which are typical drawbacks of holographic stickers. The process uses 35ns laser pulses of wavelength 355nm to generate optically-smooth deformations on the metal surface using a localised laser melting process. Security markings (holographic structures) on 304-grade stainless steel surface are fabricated, and their resulted optical performance is tested using a He–Ne laser beam of 632.8nm wavelength.
Original languageEnglish
Pages (from-to)206-218
Number of pages13
JournalJournal of Materials Processing Technology
Volume222
Early online date10 Mar 2015
DOIs
Publication statusPublished - 2015

Keywords

  • Laser material processing
  • Surface modification
  • Microstructures
  • Diffractive optics
  • Laser marking
  • Metals

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