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Proceedings Paper

Time-dependent reflection and surface temperatures during CO2 laser irradiation of dental hard tissues with 100-us pulses
Author(s): Wolf D. Seka; Daniel Fried; John D. B. Featherstone; Richard E. Glena
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Paper Abstract

We present time-resolved reflection and surface temperature measurements of dental hard tissue irradiated with 100-microsecond(s) CO2 laser pluses at two different wavelengths (9.6 and 10.6 micrometers ). The fluences in these single-pulse experiments ranged from 1 to 6 J/cm2. Time-resolved temperature measurements indicate enhanced energy coupling (absorption) for the 9.6-micrometers laser light at fluences >= 6 J/cm2 compared to irradiation at 1 J/cm2. At the same time we observe a marked reduction in surface reflection. These results are consistent with a transition from strong, relatively narrow band absorption at low temperatures (low fluences) to weaker and broader band absorption (lower absorption coefficient) at higher temperatures. Near an absorption resonance the decreased absorption coefficient leads directly to reduced reflection losses and thus increased energy coupling to the target.

Paper Details

Date Published: 1 May 1995
PDF: 6 pages
Proc. SPIE 2394, Lasers in Dentistry, (1 May 1995); doi: 10.1117/12.207456
Show Author Affiliations
Wolf D. Seka, Univ. of Rochester (United States)
Daniel Fried, Eastman Dental Ctr. (United States)
John D. B. Featherstone, Eastman Dental Ctr. (United States)
Richard E. Glena, Eastman Dental Ctr. (United States)

Published in SPIE Proceedings Vol. 2394:
Lasers in Dentistry
Harvey A. Wigdor; John D. B. Featherstone; Joel M. White, Editor(s)

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