A simplified physical model of pressure wave dynamics and acoustic wave generation induced by laser absorption in the retina |
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Authors: | Email author" target="_blank">S?J?TillEmail author P?K?Milsom G?Rowlands |
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Institution: | (1) Defence Science and Technology Laboratory, Malvern, Worcestershire, WR14 3PS, UK;(2) Department of Physics, University of Warwick, Coventry, CV4 7AL, UK;(3) Room PE206, Dstl, St. Andrews Road, Malvern, Worcestershire, WR14 3PS, UK |
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Abstract: | Shock waves have been proposed in the literature as a mechanism for retinal damage induced by ultra-short laser pulses. For
a spherical absorber, we derive a set of linear equations describing the propagation of pressure waves. We show that the formation
of shock fronts is due to the form of the absorber rather than the inclusion of nonlinear terms in the equations. The analytical
technique used avoids the need for a Laplace transform approach and is easily applied to other absorber profiles. Our analysis
suggests that the ’soft’ nature of the membrane surrounding retinal melanosomes precludes shock waves as a mechanism for the
retinal damage induced by ultra-short pulse lasers. The quantitative estimates of the pressure gradients induced by laser
absorption which are made possible by this work, together with detailed meso-scale or molecular modelling, will allow alternative
damage mechanisms to be identified. |
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