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Journal of Biomedical Optics

Laser cutting of bone tissue under bulk water with a pulsed ps-laser at 532 nm
Author(s): Cristian-Alexander Tulea; Jan Caron; Nils Gehlich; Achim Lenenbach; Reinhard Noll; Peter Loosen
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Paper Abstract

Hard-tissue ablation was already investigated for a broad variety of pulsed laser systems, which cover almost the entire range of available wavelengths and pulse parameters. Most effective in hard-tissue ablation are Er:YAG and CO2 lasers, both utilizing the effect of absorption of infrared wavelengths by water and so-called explosive vaporization, when a thin water film or water–air spray is supplied. The typical flow rates and the water layer thicknesses are too low for surgical applications where bleeding occurs and wound flushing is necessary. We studied a 20 W ps-laser with 532 nm wavelength and a pulse energy of 1 mJ to effectively ablate bones that are submerged 14 mm under water. For these laser parameters, the plasma-mediated ablation mechanism is dominant. Simulations based on the blow-off model predict the cut depth and cross-sectional shape of the incision. The model is modified considering the cross section of the Gaussian beam, the incident angle, and reflections. The ablation rate amounts to 0.2  mm3/s, corresponding to an increase by at least 50% of the highest values published so far for ultrashort laser ablation of hard tissue.

Paper Details

Date Published: 15 October 2015
PDF: 9 pages
J. Biomed. Opt. 20(10) 105007 doi: 10.1117/1.JBO.20.10.105007
Published in: Journal of Biomedical Optics Volume 20, Issue 10
Show Author Affiliations
Cristian-Alexander Tulea, Fraunhofer-Institut für Lasertechnik (Germany)
Jan Caron, Fraunhofer-Institut für Lasertechnik (Germany)
Nils Gehlich, Fraunhofer-Institut für Lasertechnik (Germany)
Achim Lenenbach, Fraunhofer-Institut für Lasertechnik (Germany)
Reinhard Noll, Fraunhofer-Institut für Lasertechnik (Germany)
Peter Loosen, Fraunhofer-Institut für Lasertechnik (Germany)
RWTH Aachen Univ. (Germany)

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