23 March 2005 Micro slant-processing by a harmonic nano-pulsed Nd:YAG laser
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Proceedings Volume 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2005) https://doi.org/10.1117/12.611046
Event: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2004, Prague, Czech Republic
Abstract
Misapplications of tickets, bills, and cards which can be easily replicated have increased in present-day society, and there is no end to damage by misapplications. It is particularly issue that information can be easily snatched by a method of fraudulent procurement such as a card skimming. Damage of card skimming is increasing every year, but it still has had a weak damage consciousness. Effective countermeasures of misapplications are needed in order to prevent these crimes. Laser processing technology has, recently, been applied to prevent the unauthorized copies of several cards, since the laser technology is able to create a particular microfabrication that is difficult for machining. The particular microfabrication can be utilized for anticounterfeit measures. A new method of writing information has been developed as an anticounterfeit-technology in our laboratory. Information was written as a slant structure which is created by using laser power profile, and this structure makes counterfeit difficult. In this study, micro slant-processing has been carried out to metals surface as the processed single shot hole using 2nd harmonic laser and dot-matrix using 3rd harmonic laser. Consequently possibility of the micro slant-processing for writing information has been examined by observing an interference pattern.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Takahiro Saito, Noriyo Sakurada, Yoshio Ishii, Yuzuru Kubota, Kazuhiro Watanabe, "Micro slant-processing by a harmonic nano-pulsed Nd:YAG laser", Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.611046; https://doi.org/10.1117/12.611046
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