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Proceedings Paper

Free-electron-laser (FEL)-induced desorption of ions from tooth dentine
Author(s): Seiji Ogino; Kunio Awazu; Takio Tomimasu
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Paper Abstract

Free electron laser (FEL) with the wide wavelength tunability has been developed and used for various applications. The FEL gives high efficiency for the photo- induced ablation when the laser is tuned to an absorption maximum of the target. This study investigates the FEL induced desorption of ions from tooth dentine to find new possibility for laser dentistry. The FEL was tuned to 9.4 (Mu) m, which is an absorption maximum of phosphoric acid ion known as major component of dentine. The FEL pulse length was several ps. The output average power was varied from 5 to 20mW by filters. A time-of-flight mass spectroscopy systems were developed for the purpose of analyzing the desorbed ions of varying masses. After the 9.4 micrometers FEL irradiation, the dentine surface was ablated, and visible light emission was observed. As a result, positive ions which correspond to Na+ and many phosphoric acid ions were measured. The positive ions, however were not observed when the FEL was not tuned to the absorption peak of the target. Therefore, this wavelength dependence points to resonant multiphoton vibrational excitation of molecules by the 9.4 micrometers FEL irradiation.

Paper Details

Date Published: 15 May 1997
PDF: 10 pages
Proc. SPIE 2973, Lasers in Dentistry III, (15 May 1997); doi: 10.1117/12.273598
Show Author Affiliations
Seiji Ogino, Free Electron Laser Institute (Japan)
Kunio Awazu, Free Electron Laser Institute (Japan)
Takio Tomimasu, Free Electron Laser Institute (Japan)

Published in SPIE Proceedings Vol. 2973:
Lasers in Dentistry III
Harvey A. Wigdor D.D.S.; John D. B. Featherstone; Peter Rechmann D.D.S., Editor(s)

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