Abstract

A digital micromirror device has been used to project variable-period grating patterns at high values of demagnification for direct laser ablation on planar surfaces. Femtosecond laser pulses of $\sim 1\mathrm{mJ}$ pulse energy at 800 nm wavelength from a Ti:sapphire laser were used to machine complex patterns with areas of up to $\sim 1{\mathrm{cm}}^2$ on thin films of bismuth telluride by dynamically modifying the grating period as the sample was translated beneath the imaged laser pulses. Individual $\sim 30$ by 30 μm gratings were stitched together to form contiguous structures, which had diffractive effects clearly visible to the naked eye. This technique may have applications in marking, coding, and security features.

© 2015 Optical Society of America

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