Abstract
Kerr self-focusing of high-power ultrashort laser pulses in atmosphere may result in a structure or structures of high intensity that can propagate over long distances with little divergence. Filamentation has garnered significant interest in the nonlinear optics community due to its unique properties. Salient features of filaments include a central region of intense laser power (greater than the ionization threshold of the propagation medium) and a low temperature plasma column that lasts up to nanoseconds in duration after the passage of the laser pulse. Steel and titanium samples are ablated by filaments and by sharply focused sub-picosecond laser pulses. We then performed metrology on the samples to compare the ablation features in addition to modeling of the plasma ablation process. Ablation with filaments leads to a wider range of material responses as compared to ablation with sharply focused pulse. This results in potential complications for applications of filament ablation that depends on the rate of material removal and spectroscopic analysis.
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Acknowledgements
The authors express their gratitude for the assistance at the U.S. Army Research Laboratory from Jeffrey Ball; Robert Borys, Jr.; Frank De Lucia, Jr.; Jennifer Gottfried; Gregory Gentle; and David MacKenzie. The authors also express their gratitude to Casey Boutwell, Ming Wei, and Matthieu Baudelet at the University of Central Florida. The authors also would like to acknowledge funding from the U.S. Army Research Laboratory and research at the University of Central Florida is funded under the JTO/AFOSR MRI on “Fundamentals of Filament Interaction” number FA95501110001 and The State of Florida.
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Valenzuela, A., Munson, C., Porwitzky, A. et al. Comparison between geometrically focused pulses versus filaments in femtosecond laser ablation of steel and titanium alloys. Appl. Phys. B 116, 485–491 (2014). https://doi.org/10.1007/s00340-013-5724-7
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DOI: https://doi.org/10.1007/s00340-013-5724-7