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4 March 2016 Nanosecond pulsed laser generation of holographic structures on metals
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Proceedings Volume 9736, Laser-based Micro- and Nanoprocessing X; 97360K (2016)
Event: SPIE LASE, 2016, San Francisco, California, United States
A laser-based process for the generation of phase holographic structures directly onto the surface of metals is presented. This process uses 35ns long laser pulses of wavelength 355nm to generate optically-smooth surface deformations on a metal. The laser-induced surface deformations (LISDs) are produced by either localized laser melting or the combination of melting and evaporation. The geometry (shape and dimension) of the LISDs depends on the laser processing parameters, in particular the pulse energy, as well as on the chemical composition of a metal. In this paper, we explain the mechanism of the LISDs formation on various metals, such as stainless steel, pure nickel and nickel-chromium Inconel® alloys. In addition, we provide information about the design and fabrication process of the phase holographic structures and demonstrate their use as robust markings for the identification and traceability of high value metal goods.
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Krystian L. Wlodarczyk, Marcus Ardron, Nick J. Weston, and Duncan P. Hand "Nanosecond pulsed laser generation of holographic structures on metals", Proc. SPIE 9736, Laser-based Micro- and Nanoprocessing X, 97360K (4 March 2016);


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