Rapid bespoke laser ablation of variable period grating structures using a digital micromirror device for multi-colored surface images

Daniel J. Heath*, Ben Mills, Matthias Feinaeugle, Robert W. Eason

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

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 1 mJ pulse energy at 800 nm wavelength from a Ti:sapphire laser were used to machine complex patterns with areas of up to 1 cm2 on thin films of bismuth telluride by dynamically modifying the grating period as the sample was translated beneath the imaged laser pulses. Individual 30 by 30 m 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.

Original languageEnglish
Pages (from-to)4984-4988
Number of pages5
JournalApplied Optics
Volume54
Issue number16
DOIs
Publication statusPublished - 1 Jun 2015
Externally publishedYes

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