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Journal of Biomedical Optics

Biophysical effects of pulsed lasers in the retina and other tissues containing strongly absorbing particles: shockwave and explosive bubble generation
Author(s): Eshel Faraggi; Bernard S. Gerstman; Jinming Sun
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Paper Abstract

Damage by pulsed lasers to the retina or other tissues containing strongly absorbing particles may occur through biophysical mechanisms other than simple heating. Shockwaves and bubbles have been observed experimentally, and depending on pulse duration, may be the cause of retinal damage at threshold fluence levels. We perform detailed calculations on the shockwave and bubble generation expected from pulsed lasers. For a variety of different laser pulse durations and fluences, we tabulate the expected strength of the shockwave and size of the bubble that will be generated. We also explain how these results will change for absorbing particles with different physical properties such as absorption coefficient, bulk modulus, or thermal expansion coefficient. This enables the assessment of biological danger, and possible medical benefits, for lasers of a wide range of pulse durations and energies, incident on tissues with absorbing particles with a variety of thermomechanical characteristics.

Paper Details

Date Published: 1 November 2005
PDF: 10 pages
J. Biomed. Opt. 10(6) 064029 doi: 10.1117/1.2139970
Published in: Journal of Biomedical Optics Volume 10, Issue 6
Show Author Affiliations
Eshel Faraggi, Florida International Univ. (United States)
Bernard S. Gerstman, Florida International Univ. (United States)
Jinming Sun, Florida International Univ. (United States)

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