Direct laser-writing of optical micro-structures for robust traceability marking of metal components

Krystian Lukasz Wlodarczyk, Marcus Ardron, Nick Weston, Matthew Kidd, Duncan Paul Hand

Research output: Contribution to conferencePaper

Abstract

This paper presents a laser-based process for the direct generation of security markings (in the form of reflective phase holograms) on the surface of metals. In order to achieve optically smooth holograms, we use a nanosecond pulsed laser operating at a 355 nm wavelength. This approach allows the metal surface to be structured, either by melting or the combination of melting and evaporation, with the required sub-micron depth control. The interaction between the UV 35 ns laser pulses and the surface of a 304-grade stainless steel, 99% pure nickel and two nickel-chromium Inconel® alloys is investigated in details and described in this paper.
Original languageEnglish
Publication statusPublished - 2014
Event15th International Symposium on Laser Precision Microfabrication 2014 - Radisson BLU Hotel Lietuva, Vilnius, Lithuania
Duration: 17 Jun 201420 Jun 2014

Conference

Conference15th International Symposium on Laser Precision Microfabrication 2014
CountryLithuania
CityVilnius
Period17/06/1420/06/14

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    Wlodarczyk, K. L., Ardron, M., Weston, N., Kidd, M., & Hand, D. P. (2014). Direct laser-writing of optical micro-structures for robust traceability marking of metal components. Paper presented at 15th International Symposium on Laser Precision Microfabrication 2014, Vilnius, Lithuania.