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Tissue ablation-rate measurements with a long-pulsed, fibre-deliverable 308 nm excimer laser

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Abstract

This ablation rate study has been carried out with a fibre-deliverable, 308 nm, XeCl laser, producing long pulses of 200 ns as opposed to the usual 10–20 ns. This in-depth study aimed to evaluate the ablation rates for this longer pulse length. The effects on the ablation depth of dentine, enamel, soft tissue and bone were investigated ex vivo. Radiant exposure, number of pulses, pulse repetition rate and spot size were independently varied. For all tissues, ablation depth per pulse was found to increase, initially, linearly with radiant exposure. For both dentine and soft tissue a saturation radiant exposure was determined; thereafter the ablation rate decreased. The depth per pulse increased linearly with repetition rate but decreased logarithmically with both number of pulses and spot size. The ablation depth due to a 200 ns pulse is comparable to that caused by a 10–20 ns pulse but has the advantage of fibre delivery.

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Acknowledgements

This work was carried out under an Engineering and Physical Science Research Council grant.

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  1. Laser Photonics Group, Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK

    Andrea K. Murray & Mark R. Dickinson

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  1. Andrea K. Murray
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  2. Mark R. Dickinson
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Correspondence to Andrea K. Murray.

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Murray, A.K., Dickinson, M.R. Tissue ablation-rate measurements with a long-pulsed, fibre-deliverable 308 nm excimer laser. Lasers Med Sci 19, 127–138 (2004). https://doi.org/10.1007/s10103-004-0315-9

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