Abstract
Single-shot ablation threshold for thin chromium film was studied using 266 nm, femtosecond laser pulses. Chromium is a useful material in the nanotechnology industry and information on ablation threshold using UV femtosecond pulses would help in precise micromachining of the material. The ablation threshold was determined by measuring the ablation crater diameters as a function of incident laser pulse energy. Absorption of 266 nm light on the chromium film was also measured under our experimental conditions, and the absorbed energy single-shot ablation threshold fluence was \(46 \pm 5\) mJ/cm2. The experimental ablation threshold fluence value was compared to time-dependent heat flow calculations based on the two temperature model for ultrafast laser pulses. The model predicts a value of 31.6 mJ/cm2 which is qualitatively consistent with the experimentally obtained value, given the simplicity of the model.
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The authors wish to acknowledge funding for this research from the Natural Sciences and Engineering Research Council of Canada.
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Banerjee, S.P., Fedosejevs, R. Single-shot ablation threshold of chromium using UV femtosecond laser pulses. Appl. Phys. A 117, 1473–1478 (2014). https://doi.org/10.1007/s00339-014-8577-y
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DOI: https://doi.org/10.1007/s00339-014-8577-y