Laser drilling of banknote substrates

A simple model for laser drilling

A simple mathematical model of laser drilling is proposed. Assuming axi-symmetry of the process around the axis of the laser beam, a one-dimensional formulation is obtained after cross-sectional averaging. The novelty of the approach relies on the fact that even after dimension reduction, the shape of the hole can still be described. The model is derived, implemented and validated for drilling ...

Laser Drilling Assisted with Jet Electrochemical Machining

Micro-hole drilling with femtosecond fiber laser

In this paper, micro-hole drilling in ambient air is presented using fs fiber laser (750 fs & 1030 nm). Micro holes were fabricated in both transparent (glasses) and non-transparent materials (metals and tissues). Hole shape and morphology was characterized and evaluated with optical microscope and scanning electron microscopy (SEM). Debris-free micro holes with good roundness and no thermal da...

Laser Rock Drilling by A Super-Pulsed CO2 Laser Beam

High power carbon dioxide lasers have successfully been used in drilling or cutting ngineering materials such as metals, polymers and ceramics over the years. Can a arbon dioxide laser be used to efficiently drill different rocks in a deep gas well? esearch sponsored by US Department of Energy has been carried out to answer this uestion. This paper will report the study results of using a super...

Banknote Quality in Australia

Under the Reserve Bank Act 1959, the Reserve Bank has responsibility for the production, issue, reissue and cancellation of Australia’s banknotes. The key objective of the Bank in meeting this legislative responsibility is to maintain public confidence in Australia’s banknotes. There are three facets to this. First, the Bank ensures that there are sufficient banknotes to meet demand. Second, it...