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01-03-2007 | Original article

Thermal ablation of FEL irradiation using gypsum as an indicator

Authors: Toshiro Sakae, Yukie Sato, Yasuko Numata, Taketoshi Suwa, Tohru Hayakawa, Kunihiro Suzuki, Takao Kuwada, Ken Hayakawa, Yasushi Hayakawa, Toshinari Tanaka, Isamu Sato

Published in: Lasers in Medical Science | Issue 1/2007

Abstract

Thermal effects produced in a laser-irradiated sample were studied by micro-X-ray diffraction and micro-Fourier transform infrared spectroscopy (FTIR). Gypsum, transformed into bassanite at 124°C and into anhydrite at 147°C, was used as a thermal indicator. Pit formation by a wavelength-tunable free electron laser (FEL) irradiation on the gypsum pellet maximized at a wavelength of 3.0 μm, 2 mJ/shot, and pits were not detected in those irradiated at 2.6 or 3.8 μm compared with the maximum at 3.0 μm and diminished at 2.0 or 4.0 μm in the human tooth case. Micro-X-ray diffraction and micro-FTIR did not reveal any appreciable bassanite or anhydrite in the irradiated regions. From the laser ablation viewpoint, these results allow the FEL ablation to be considered as plasma or evaporative ones. This study indicated that the micro-pulse of laser was effective to prevent thermal damages of laser irradiation.

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Title: Thermal ablation of FEL irradiation using gypsum as an indicator
Authors: Toshiro Sakae
Yukie Sato
Yasuko Numata
Taketoshi Suwa
Tohru Hayakawa
Kunihiro Suzuki
Takao Kuwada
Ken Hayakawa
Yasushi Hayakawa
Toshinari Tanaka
Isamu Sato
Publication date: 01-03-2007
Publisher: Springer-Verlag
Published in: Lasers in Medical Science / Issue 1/2007
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-006-0414-x

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Thermal ablation of FEL irradiation using gypsum as an indicator

Abstract

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