Influence of the spatial beam profile on hard tissue ablation, part II: pulse energy and energy density distribution in simple beams

Lasers in Medical Science
Jörg MeisterNorbert Gutknecht

Abstract

When calculating applied flux densities in practice, the beam profile of a laser is often erroneously assumed to be homogeneous. In addition, there is usually no consistency in the choice of a suitable measuring method for determining the beam diameter. This failure to observe the inhomogeneous intensity distribution within the beam cross-section, combined with the imprecise knowledge of the beam diameter, leads to flux densities being stated that represent mean values at best. The present paper gives definitions for the flux densities of simple, radially symmetrical beam cross-sections, taking the top-hat and Gaussian profiles as examples. In connection with the inhomogeneous energy distribution in the Gaussian beam, a concept of integral and local energy density is discussed, which differs from the customary definition of the energy density as a constant. Also presented are the consequences of the mathematical concepts in terms of measurement, giving particular consideration to the case where the energy density as the measured variable matches the integral energy density. The significance of the integral and local energy density for hard-tissue ablation is described, based on the practical example of the ablation of dental ha...Continue Reading

References

Jan 1, 1980·Vision Research·D H Sliney, M L Wolborsht
Nov 6, 2002·Lasers in Medical Science·C ApelN Gutknecht
Jul 1, 1977·Applied Optics·A H FiresterP Sheng
Apr 15, 1981·Applied Optics·M B Schneider, W W Webb
Jul 1, 1987·Applied Optics·R M O'Connell, R A Vogel

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Citations

Aug 3, 2012·Lasers in Medical Science·Frank Y W YungHorst Fischer
Apr 23, 2009·Photomedicine and Laser Surgery·Maria Cristina BorsattoRegina Guenka Palma-Dibb
Apr 28, 2010·Lasers in Medical Science·Marcella Esteves-OliveiraCarlos Paula de Eduardo
Dec 3, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·Richard B T PriceJohn Fahey
Jun 3, 2008·Microscopy Research and Technique·A E Souza-GabrielS A M Corona
Jan 16, 2010·Lasers in Surgery and Medicine·Joshua E SchoenlyPeter Rechmann
Jun 13, 2015·Photomedicine and Laser Surgery·Karen Müller RamalhoCarlos de Paula Eduardo
Dec 8, 2016·Journal of Biomedical Optics·Gregory AltshulerValery Tuchin
Oct 21, 2011·Brazilian Dental Journal·Cacio Moura-NettoCelso Luiz Caldeira
Feb 20, 2014··Ksenia V. ShatilovaAndrey V. Belikov

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