UGV technology for urban navigation

Henrik I. Christensen; John Folkesson; Andreas Hedstrom; Carl Lundberg

doi:10.1117/12.541053

2 September 2004 Physical characteristics of excimer laser-tissue interaction

Henrik I. Christensen, John Folkesson, Andreas Hedstrom, Carl Lundberg

Proceedings Volume 5422, Unmanned Ground Vehicle Technology VI; (2004) https://doi.org/10.1117/12.541053
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

The excimer laser has proven to be the laser of choice in various biomedical applications for both soft and hard tissues. The excimer laser-tissue interaction is vastly different from other lasers due to the high energies of each photon, the short pulse duration, and small volume of tissue effected. In addition to the particle ejection, heat generation and spectral emission, the interaction also produces acoustical disturbances in both the air and in the tissue. The plume dynamics were detected with a second laser (Nd;YAG at 532 nm) illuminating the particles and a CCD camera detecting the (90°) scattered radiation to form an image. A similar setup was used to detect the acoustical disturbances, but this time the forward scattered radiation off of the information about these acoustical disturbance we designed and built an ultrasonic probe to do so. The luminescence was measured with a time resolved spectroscopy system. The thermal effects were measured with a thermal camera. By measuring these different effects our understanding of the interaction is enhanced, the parameters for a specific medical laser application can be optmized for the best results, and each one can be used as a real-time (before the next pulse) feedback control system.

Citation Download Citation

Henrik I. Christensen, John Folkesson, Andreas Hedstrom, and Carl Lundberg "Physical characteristics of excimer laser-tissue interaction", Proc. SPIE 5422, Unmanned Ground Vehicle Technology VI, (2 September 2004); https://doi.org/10.1117/12.541053

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