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Optical Engineering

Abnormal photon absorption behavior in melanin detected by photothermal lensing due to simultaneous irradiation with multiple laser wavelengths
Author(s): Yue Han; Joseph S. Rosenshein; Z. L. Wu; Wen Ye; Marshall Thomsen; Qiang Zhao
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Paper Abstract

A photophysical model for describing the absorption of light by melanin based on the mechanisms of sequential two-photon absorption is investigated. The process involves a conversion of the photon energy in a photochemical effect such as photodissociation of the biological molecules. The collinear photothermal lensing technique is employed to obtain stable, reliable and accurate detection of nonlinear photon absorption in melanin. In these experiments, a He-Ne laser and an argon-krypton ion laser are used to provide two different excitation wavelengths simultaneously. The experimental results were consistent with the theoretical model described.

Paper Details

Date Published: 1 February 2001
PDF: 7 pages
Opt. Eng. 40(2) doi: 10.1117/1.1339202
Published in: Optical Engineering Volume 40, Issue 2
Show Author Affiliations
Yue Han, Biocontrol Technology, Inc. (United States)
Joseph S. Rosenshein, Sinai Hospital (United States)
Z. L. Wu, Lawrence Livermore National Lab. (United States)
Wen Ye, Univ. of Michigan (United States)
Marshall Thomsen, Eastern Michigan Univ. (United States)
Qiang Zhao, Eastern Michigan Univ. (United States)

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