Abnormal photon absorption behavior in melanin detected by photothermal lensing due to simultaneous irradiation with multiple laser wavelengths

Yue Han; Joseph S. Rosenshein; Z. L. Wu; Wen Ye; Marshall Thomsen; Qiang Zhao

doi:10.1117/1.1339202

1 February 2001 Abnormal photon absorption behavior in melanin detected by photothermal lensing due to simultaneous irradiation with multiple laser wavelengths

Yue Han, Joseph S. Rosenshein, Z. L. Wu, Wen Ye, Marshall Thomsen, Qiang Zhao

Author Affiliations +

Optical Engineering, Vol. 40, Issue 2, (February 2001). https://doi.org/10.1117/1.1339202

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.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Yue Han, Joseph S. Rosenshein, Z. L. Wu, Wen Ye, Marshall Thomsen, and Qiang Zhao "Abnormal photon absorption behavior in melanin detected by photothermal lensing due to simultaneous irradiation with multiple laser wavelengths," Optical Engineering 40(2), (1 February 2001). https://doi.org/10.1117/1.1339202

Published: 1 February 2001

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