Visible Light Emission due to Resonant CO2 Laser Excitation of Dental Hard Tissue |
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| Authors: | A Lohner M Huber S D Ganichev W Prettl and H Niederdellmann |
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| Institution: | (1) Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany;(2) Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie, Universität Regensburg, 93040 Regensburg, Germany |
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| Abstract: | Visible light emission of dental hard substances excited by high-power infrared pulses of a tunable TEA CO2 laser has been investigated. A clear correlation between observed visible light emission, plasma formation as well as ablation of dental hard tissue has been demonstrated. Both, the highly nonlinear infrared to visible upconversion process and the ablation efficiency show a sharp spectral resonance close to a vibrational mode of PO4 at 1090 cm-1 in dental enamel and dentin. The influence of strong infrared light impulses on dental hard tissue is examined by performing upconversion studies of visible light emission of human dental enamel and dentin. Our experimental setup allows one to determine the plasma formation threshold being important in dental surgery. |
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| Keywords: | CO2 laser hydroxyapatite infrared absorption laser ablation plasma threshold PO4 mode upconversion |
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