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Journal of Biomedical Optics

Decay of photoacoustic signals from biological tissue irradiated by near infrared laser pulses
Author(s): Grzegorz Gondek; Teng Li; Richard Lynch; Richard J. Dewhurst
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Paper Abstract

We describe the phenomenon of a sudden decrease in the amplitude of photoacoustic signals arising from nanosecond laser pulse irradiation of biological samples, measured in vitro. Several dental enamel and chicken/turkey breast samples are examined. Moderate optical energy densities (i.e., about 300 mJ/cm2) are used, typical of those exploited in photoacoustic investigations. Measurements show a rapid decay of photoacoustic signals within the first few laser pulses absorbed by the sample. This phenomenon indicates that laser irradiation interacts with biological samples, causing long-term physical changes that can be attributed to a reduction of optical absorption within the samples.

Paper Details

Date Published: 1 September 2006
PDF: 4 pages
J. Biomed. Opt. 11(5) 054036 doi: 10.1117/1.2360690
Published in: Journal of Biomedical Optics Volume 11, Issue 5
Show Author Affiliations
Grzegorz Gondek, The Univ. of Manchester (United Kingdom)
Teng Li, The Univ. of Manchester (United Kingdom)
Richard Lynch, Unilever Research & Development (United Kingdom)
Richard J. Dewhurst, The Univ. of Manchester (United Kingdom)

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